Fri Jan 01, 2010 9:29 pm

Hooked
LX 150
Joined: 02 Aug 2009
Posts: 194
Location: Camarillo CA
 
Hooked
LX 150
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Posts: 194
Location: Camarillo CA
Fri Jan 01, 2010 9:29 pm linkquote
I have made an alteration that has solved the suffocation within the exhaust. This change has allowed a significant power increase, unfortunately I am unable to post photos. How do you put a photo into this blog?
Sat Jan 02, 2010 9:46 am

Enthusiast
2010 GTS Super 300ie "Nero Bello"
Joined: 06 Aug 2009
Posts: 75
Location: Oklahoma City
 
Enthusiast
2010 GTS Super 300ie "Nero Bello"
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Location: Oklahoma City
Sat Jan 02, 2010 9:46 am linkquote
Check out: FAQ: How do I upload a photo? (and be sure that the image size conforms.)
Sat Jan 02, 2010 10:01 am

Ossessionato
GTS, LX, VSD, VSX, VNX, LD 125, Chucky, LI125
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Ossessionato
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Sat Jan 02, 2010 10:01 am linkquote
Buddy of mine opened up a GTS exhaust and did some 'removing' of constrictions...no sensed increase in power....and it backfires alot now.

Did lighten it up 3 LBS tho.

Some pics of your changes would be of interest...does it backfire?

R

8)
Sat Jan 02, 2010 11:56 am

Ossessionato
01 ET2 - 01 ET4 -- 05 GT200L / 05 PX150 / 1986? Honda CH150 Deluxe.
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Ossessionato
01 ET2 - 01 ET4 -- 05 GT200L / 05 PX150 / 1986? Honda CH150 Deluxe.
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Sat Jan 02, 2010 11:56 am linkquote
If you have just altered the stock exhaust, a power increase would likely be very small. It will just make alot more noise. Did you test it on a Dyno to see the before and after results?
Mon Jan 04, 2010 7:10 pm

Hooked
LX 150
Joined: 02 Aug 2009
Posts: 194
Location: Camarillo CA
 
Hooked
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Location: Camarillo CA
Mon Jan 04, 2010 7:10 pm linkquote
Not any increase in backfire, only a bit louder. The trick is to maintain resonance and not just tear out the entire interior. There is a factory designed length of initial muffler pipe and that integrity must be maintained. Still working on pics.
Tue Jan 05, 2010 2:59 pm

Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
 
Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
Tue Jan 05, 2010 2:59 pm linkquote
ANY PICTURES??? I just ran a big drill bit up the end of my ET pipe,gradually increasing the size of drill until it sounded better!!!, has a nice little burble when I throttle off no backfire. Stock pipe was too quiet
Tue Jan 05, 2010 6:39 pm

Hooked
LX 150
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Posts: 194
Location: Camarillo CA
 
Hooked
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Tue Jan 05, 2010 6:39 pm linkquote
a Drill in the tailpipe actually will reduce the length of the internal pipe which in turn is counter productive. You have eliminated the thrust required for proper resonating effect. The internal pipe will wrap within the muffler to produce the factory engineered function. The problem within the factory muffler is considered to be "suffocation" or inability to eliminate gasses within a timely manner. The purpose of suffocation is to assist with cleaner emissions.
Wed Jan 06, 2010 2:49 am

Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
 
Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
Wed Jan 06, 2010 2:49 am linkquote
Seems to work for me mate!! has no effect on top speed/ mpg etc JUST sounds better! that works for me! any pics yet????
Wed Jan 06, 2010 4:24 am

Ossessionato
Blue GTS300 Super 2015, White GTS300 Super 2018
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Location: Sydney, Australia
 
Ossessionato
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Wed Jan 06, 2010 4:24 am linkquote
Also waiting for details. I must admit I am sceptical. A louder engine can sound as if it is more powerful.

But I would prefer a GRRRRR or VROOM to the present AAAARRGH sound.

Mike
Thu Jan 07, 2010 7:11 pm

Hooked
LX 150
Joined: 02 Aug 2009
Posts: 194
Location: Camarillo CA
 
Hooked
LX 150
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Posts: 194
Location: Camarillo CA
Thu Jan 07, 2010 7:11 pm linkquote
This should assist you to understand, when you increase air flow (exhaust) you increase the ability of the mechanism to work more efficiently. With the engine exhaust working properly the output is increased. You are only able to make minor improvements but the compilation of minor increases will compound to what is known as a tuned engine.



Thu Jan 07, 2010 9:32 pm

Ossessionato
GTS, LX, VSD, VSX, VNX, LD 125, Chucky, LI125
Joined: 21 Oct 2005
Posts: 4181
Location: San Jose CA
 
Ossessionato
GTS, LX, VSD, VSX, VNX, LD 125, Chucky, LI125
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Location: San Jose CA
Thu Jan 07, 2010 9:32 pm linkquote
Defendo007 wrote:
This should assist you to understand, when you increase air flow (exhaust) you increase the ability of the mechanism to work more efficiently. With the engine exhaust working properly the output is increased. You are only able to make minor improvements but the compilation of minor increases will compound to what is known as a tuned engine.
Dude...

Now I totally understand.

You rock!

Great pic!

R

8)
Fri Jan 08, 2010 8:16 am

Hooked
Joined: 26 Dec 2009
Posts: 314

 
Hooked
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Posts: 314

Fri Jan 08, 2010 8:16 am linkquote
glasseye wrote:
Defendo007 wrote:
This should assist you to understand, when you increase air flow (exhaust) you increase the ability of the mechanism to work more efficiently. With the engine exhaust working properly the output is increased. You are only able to make minor improvements but the compilation of minor increases will compound to what is known as a tuned engine.
Dude...

Now I totally understand.

You rock!

Great pic!

R

8)
lol.
Sat Jan 09, 2010 5:54 am

Ossessionato
GTS 250ie
Joined: 21 Jun 2008
Posts: 2046
Location: Rhode Island
 
Ossessionato
GTS 250ie
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Posts: 2046
Location: Rhode Island
Sat Jan 09, 2010 5:54 am linkquote
Defendo007 wrote:
This should assist you to understand, when you increase air flow (exhaust) you increase the ability of the mechanism to work more efficiently. With the engine exhaust working properly the output is increased. You are only able to make minor improvements but the compilation of minor increases will compound to what is known as a tuned engine.
Well, yes and no. IF the exhaust is very restrictive, reducing backpressure only moves the bottleneck up the chain to valves, ports, intake.

To actually take advantage of anything a pipe would do, you need to deristrict the intake, rejet a carbed bike, and often adjust ignition timing. Better flow through the head by porting or high flow replacement also reaps gains here.

In addition, there is such a thing as resonance--by opening up the chamber and then forcing the exhaust to exit a through a smallish pipe an exhaust can actually help with scavenging. Sometimes removing baffles actually reduces this effect, diminishing or eliminating any gains from lower restriction.

Backyard "engineers" tend to reduce the reliability of their rides while gaining little in performance. The bike may sound more powerful, but it probably isn't.

I've got plenty of friends who are riders of all stripes. A friend of mine called me after he got his Harley done up--special cam, head, pistons, bored cylinders, carb, straight pipes, fully built up and "tuned". He spent a freakin' fortune and proudly let me ride is bike. He said it was a monster, and real powerful.

OK, off I go. At 2200rpm it started to pull like a train. At 2600rpm it was totally out of steam. Yeah, when you opened the throttle it kicked you in the pants, but the bike was an unrideable piece of shit. He loves it still, because he "knows" it's much "faster" and "better" than a stocker.

Show me on a dyno and I'll believe you, otherwise enjoy your hobby, but don't bother me with your claims.

P.
Sat Jan 09, 2010 9:05 am

Hooked
LX 150
Joined: 02 Aug 2009
Posts: 194
Location: Camarillo CA
 
Hooked
LX 150
Joined: 02 Aug 2009
Posts: 194
Location: Camarillo CA
Sat Jan 09, 2010 9:05 am linkquote
Please read what I wrote again. You must have a compilation of factors for any improvement. One variable will affect another. Your knowledge of engine functionality is admirable. Once you begin to change from stock to tuned you are entering an area that is subject to debate and this is what the forum is about.
Sat Jan 09, 2010 2:22 pm

Ossessionato
Blue GTS300 Super 2015, White GTS300 Super 2018
Joined: 01 Nov 2005
Posts: 2869
Location: Sydney, Australia
 
Ossessionato
Blue GTS300 Super 2015, White GTS300 Super 2018
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Sat Jan 09, 2010 2:22 pm linkquote
Still no photo or details. Is this topic going anywhere?
Mike
Sat Jan 09, 2010 2:59 pm

Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
 
Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
Sat Jan 09, 2010 2:59 pm linkquote
PICS ????
Here are some of the inside of a spare ET4 stock exhaust I had and cut open whilst we are waiting for defendo's pics . What parts did you modify?




THIS IS THE PATH THE BIG DRILL BIT I USED TOOK

Sat Jan 09, 2010 3:12 pm

Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
 
Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
Sat Jan 09, 2010 3:12 pm linkquote
ps if you set the image quality on your camera to its lowest the pics come out larger
Sun Jan 10, 2010 8:30 am

Ossessionato
GTS 250ie
Joined: 21 Jun 2008
Posts: 2046
Location: Rhode Island
 
Ossessionato
GTS 250ie
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Sun Jan 10, 2010 8:30 am linkquote
Defendo007 wrote:
Please read what I wrote again. You must have a compilation of factors for any improvement. One variable will affect another. Your knowledge of engine functionality is admirable. Once you begin to change from stock to tuned you are entering an area that is subject to debate and this is what the forum is about.
Ok, I get big-headed some times.

Edited to try fix my personality.
Sun Jan 10, 2010 6:07 pm

Hooked
LX 150
Joined: 02 Aug 2009
Posts: 194
Location: Camarillo CA
 
Hooked
LX 150
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Posts: 194
Location: Camarillo CA
Sun Jan 10, 2010 6:07 pm linkquote
END OF PAGE, POST NO MORE I will post again in a month or so. With photos and technical data.

Thank you for all your responses and input. Evidently some of the readers over estimated the extent of the modification by removing everything. Please always research before you alter any of the systems of these delicate machines.
Sun Jan 10, 2010 9:38 pm

Banned
2:6
Joined: 11 Jan 2007
Posts: 7819
Location: San Francisco
 
Banned
2:6
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Posts: 7819
Location: San Francisco
Sun Jan 10, 2010 9:38 pm linkquote
Defendo007 wrote:
EEvidently some of the readers over estimated the extent of the modification by removing everything. Please always research before you alter any of the systems of these delicate machines.
What? No one did any such thing. You were having issues posting pictures so a very clear picture was posted of all the internals to aid in the conversation. All you have to do is speak to what part of the internals of the pipe you modified.
Mon Jan 11, 2010 4:15 am

Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
 
Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
Mon Jan 11, 2010 4:15 am linkquote
Defendo007 wrote:
END OF PAGE, POST NO MORE I will post again in a month or so. With photos and technical data.

Thank you for all your responses and input. Evidently some of the readers over estimated the extent of the modification by removing everything. Please always research before you alter any of the systems of these delicate machines.
look forward to it , cheers Bill
Tue Jan 12, 2010 6:40 pm

Hooked
LX 150
Joined: 02 Aug 2009
Posts: 194
Location: Camarillo CA
 
Hooked
LX 150
Joined: 02 Aug 2009
Posts: 194
Location: Camarillo CA
Tue Jan 12, 2010 6:40 pm linkquote
PHOTO!!!!
OK, here is the photo of the finished muffler. I started with a SITO aftermarket muffler with no converter. Opened it up with a plasma cutter. Did my homework by contacting a person with their degree in Indusirial Arts, Engine design and MIG welded everything up when finished. The tailpipe is now 1.5 inched in diameter.



Tue Jan 12, 2010 8:36 pm

Petty Tyrant
GTS250 GTS300 MP3 500
Joined: 11 Oct 2005
Posts: 31538
Location: Bay Area, California
 
Petty Tyrant
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Tue Jan 12, 2010 8:36 pm linkquote
So besides a bigger tip, what else did you change?
Wed Jan 13, 2010 2:00 am

Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
 
Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
Wed Jan 13, 2010 2:00 am linkquote
nice ! do you have any pics of what you did to the internals? If not feel free to use my cutaway pics to show the path of gas flow .Do you still have the SAS connected ? see arrow, also is the area outlined in red where you cut open the muffler? very interested in what changes you made internally ans I still have my spare to play with lol Cheers Bill



Wed Jan 13, 2010 5:58 pm

Hooked
LX 150
Joined: 02 Aug 2009
Posts: 194
Location: Camarillo CA
 
Hooked
LX 150
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Location: Camarillo CA
Wed Jan 13, 2010 5:58 pm linkquote
I should have taken pictures of the inside, I got so wrapped up in this I forgot. With the exhaust permitted to evacuate much faster the result is overall performance increase. I have taken this Vespa LX to 70 but afraid to do it again.
Wed Jan 13, 2010 11:45 pm

Ossessionato
GTS, LX, VSD, VSX, VNX, LD 125, Chucky, LI125
Joined: 21 Oct 2005
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Wed Jan 13, 2010 11:45 pm linkquote
Okay...you pulled some bits out and increased the diameter of the tailpipe....I am assuming from the front chamber to the rear outlet.

How much weight did you shed?

backfiring?

What is the diameter of the tube you used for the tailpipe section?

Any dyno work-up?

Any better than a sito plus?

Good to see some metal work on the stock pipes...

R

8)
Thu Jan 14, 2010 1:18 am

Member
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Posts: 13

 
Member
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Posts: 13

Thu Jan 14, 2010 1:18 am linkquote
Defendo, if you like the increased noise, good for you. I don't recall even once I wanted a louder bike riding from coast to coast many times and Los Angeles to Portland dozens of times.

It wasn't long ago you could buy regular and unleaded gasoline. Friends and neighbors would buy new cars and punch out the unleaded restrictor so they could buy the cheaper regular gasoline. Oregon had a limited area around Portland for emission testing. With no testing, it only took a few raps of a hammer. Not sure what the laws are today.

Your knowledge of this muffler project is way beyond most. You are happy, and good for you.
Thu Jan 14, 2010 7:00 pm

Hooked
LX 150
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Posts: 194
Location: Camarillo CA
 
Hooked
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Location: Camarillo CA
Thu Jan 14, 2010 7:00 pm linkquote
Muffler improvement.
When my LX gets up to 70 miles per hour and cruises at a much improved rate than stock I would consider that a significant improvement, noise is a byproduct. The pipe of 1.5 in. dia. at exit is sufficient to expel gasses at an accelerated rate. The exhaust improvement is only one concomitant to a tuned engine. To eliminate pipes for noise serves no purpose, to improve air flow serves a purpose.
Thu Jan 14, 2010 7:09 pm

Hooked
LX 150
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Posts: 194
Location: Camarillo CA
 
Hooked
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Thu Jan 14, 2010 7:09 pm linkquote
Answering questions
The weigh loss was insignificant , a few lbs.

The Sito muffler was available so I used it, did not consider any others.

The plasma cutting of the casing was easy to do and with a MIG welder easy to repair any slits to the original casing.

A dyno test is an excellent indicator of any before and after change. Since I did not dino prior to work it appears that was my mistake.

The true test is overall performance. The speedometer being at 70 is my indicator for now.

By design I have eliminated a common problem, backfiring is minimal and not noticeable.
Fri Jan 15, 2010 3:23 am

Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
 
Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
Fri Jan 15, 2010 3:23 am linkquote
Re: PICS ????
xmanhoe wrote:
Here are some of the inside of a spare ET4 stock exhaust I had and cut open whilst we are waiting for defendo's pics . What parts did you modify?
thanks, pity you never took pics of inside! I know what you mean about getting carried away lol, can you indicate on my cut away pic where or what you removed??? as i would like to do this to the spare muffler I split and try it on my ET4 125 as I have access to a Dyno and can test before and after thanks ,really looking forward to trying this one thanks again Bill
Fri Jan 15, 2010 7:14 pm

Hooked
LX 150
Joined: 02 Aug 2009
Posts: 194
Location: Camarillo CA
 
Hooked
LX 150
Joined: 02 Aug 2009
Posts: 194
Location: Camarillo CA
Fri Jan 15, 2010 7:14 pm linkquote
Here is what you change
The original exhaust pipe must not be altered, this is the one that "loops 180 degrees and is a direct pipe from the exhaust gasses. You must patch up the drill hole as indicated in your photo, big mistake to alter this section. The final chamber the gasses enter (upper most and smallest) is where you increase the expelled gasses with a larger diameter section, 1.5 inches no larger than 1.625. continue with the enlarged diameter one chamber at a time with this size pipe, thinwall no seam mild steel. Direct the flow of gasses outward at original exit. I used a lathe to machine the final exhaust that is visible in the photograph. Mig weld everything up but do not braze ( the heat will affect the braze -resulting in brittleness and fatigue stress cracks).

Good luck
Tue Jan 19, 2010 4:47 am

Ossessionato
GTS 250ie
Joined: 21 Jun 2008
Posts: 2046
Location: Rhode Island
 
Ossessionato
GTS 250ie
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Location: Rhode Island
Tue Jan 19, 2010 4:47 am linkquote
While generally skeptical about home tuners, what you described is quite sound, thoughtful and should actually help with power.

Great job!

P.
Tue Jan 19, 2010 9:13 am

Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
 
Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
Tue Jan 19, 2010 9:13 am linkquote
Hi Defendo, is this the section of pipe you replaced with the 1.5 pipe ??(marked section 1 and 2) and then where it enters the rear section of muffler as shown with arrow in my other picture??? would really like to try this as I have one cut open and ready lol ps only found ot after i cut the shite out of it that I could have gotten £50 for it on ebay !!! lol look forward to your reply BIll





Mon Feb 01, 2010 1:51 am

Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
 
Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
Mon Feb 01, 2010 1:51 am linkquote
bump ! any thoughts on this yet Defendo????
Mon Feb 01, 2010 6:03 pm

Hooked
LX 150
Joined: 02 Aug 2009
Posts: 194
Location: Camarillo CA
 
Hooked
LX 150
Joined: 02 Aug 2009
Posts: 194
Location: Camarillo CA
Mon Feb 01, 2010 6:03 pm linkquote
Correct
Bill, you are 100% correct. That is my formula, I had outstanding results doing this. Next I go to 190 Malossi Top end and Experiment with variator.
Good luck
Tue Feb 02, 2010 1:31 am

Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
 
Molto Verboso
Belvoir Wine Team RC (Buckfast Commando) ,Rusty Sheriff's Badge MCC, 07 ET4 ,07 Piaggio X8
Joined: 19 May 2007
Posts: 1499
Location: Belfast N.Ireland
Tue Feb 02, 2010 1:31 am linkquote
Cheers thanks bill
Tue Feb 02, 2010 12:02 pm

Hooked
LX 150
Joined: 02 Aug 2009
Posts: 194
Location: Camarillo CA
 
Hooked
LX 150
Joined: 02 Aug 2009
Posts: 194
Location: Camarillo CA
Tue Feb 02, 2010 12:02 pm linkquote
Be patient !
To do this I used a plasma cutter , drills, rotating hand held small grinder. It takes time to get it perfect but if I did it you can easily do the alterations.I know your results will match mine and the results are obvious and noticeable with not much noise change.
Wed Feb 03, 2010 11:25 am

Molto Verboso
Joined: 10 Feb 2008
Posts: 1104
Location: Midwest
 
Molto Verboso
Joined: 10 Feb 2008
Posts: 1104
Location: Midwest
Wed Feb 03, 2010 11:25 am linkquote
Defendo007,

You now are seeing 70 on your speedometer.Just curious what number was you seeing before the mod? Curious about the change. Thanks.
Sat Feb 06, 2010 3:28 pm

Hooked
LX 150
Joined: 02 Aug 2009
Posts: 194
Location: Camarillo CA
 
Hooked
LX 150
Joined: 02 Aug 2009
Posts: 194
Location: Camarillo CA
Sat Feb 06, 2010 3:28 pm linkquote
Speed
Before the modifications I was seeing on the speedometer 80.


Just kidding it was reading 62. I realize that the stock speedometer is approximate but one thing I am certain of is that no one was passing me at the 80 mph speedometer reading!!!
⬆️    About 4 months elapsed between posts    ⬇️
Tue Jun 08, 2010 10:32 pm

Lurker
Joined: 08 Jun 2010
Posts: 1

 
Lurker
Joined: 08 Jun 2010
Posts: 1

Tue Jun 08, 2010 10:32 pm linkquote
Re: PICS ????
xmanhoe wrote:
Here are some of the inside of a spare ET4 stock exhaust I had and cut open whilst we are waiting for defendo's pics . What parts did you modify?
I would cut or drill holes in the final pipe between the smallest baffle and medium baffle. If the exhaust is properly tuned from the factory then you want to maintain the tune but reduce the back pressure. Modifying this section of pipe will maintain the tune and eliminate some back pressure.
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