Wed, 13 Apr 2022 08:05:41 +0000

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Wed, 13 Apr 2022 08:05:41 +0000 linkquote
Hello
I have a 2001 ET4 150 that I bought christmas 2015. It had 600 miles on it at that time. Bike had been sitting for 14 years but would still crank and idle.
At that time I Installed a new battery, new iridium plug, a new (chinese made) petcock, new fuel line, new rear tire (nearly bald after only 600 miles?) cleaned the carb as best I could, a float needle from a 50cc chinese scooter carb rebuild kit that looked identical to the original and the bike has served me well over the past 6 years and 12k miles.

Now a strange thing is happening. When the gas light starts to flicker the engine will start to hesitate like its running out of gas, and sometimes will let out a backfire. It actually cut off on me twice last summer and I had to be rescued. I tried ANOTHER ebay chinese made petcock with same result. I just installed an OEM petcock and same result but not as bad. If I keep on the gas it soon clears up and I can carry on as normal. I'm stumped. Bike still has the original Walbro carb. I have another float needed OTW.

Has anyone seen anything like this on an ET4?

Last edited by Pearl on Thu, 21 Apr 2022 00:35:48 +0000; edited 3 times
Wed, 13 Apr 2022 08:22:03 +0000

Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
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Wed, 13 Apr 2022 08:22:03 +0000 linkquote
in the last 12K have you done any other maintenance?
Wed, 13 Apr 2022 08:36:15 +0000

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Wed, 13 Apr 2022 08:36:15 +0000 linkquote
Yes
Tires
oil changes
belt once
rollers
I should have said before that I ditched the oem air filter for a washable one that I have cleaned several times. I usually do this when I change the oil and filter every spring. I guess its time for that too.
It's yet to have a valve adjustment
Wed, 13 Apr 2022 08:46:30 +0000

Sergeant at Arms
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Wed, 13 Apr 2022 08:46:30 +0000 linkquote
I'd say your china petcock has met its life expectancy.

but, on a 20 yr old bike I'd be looking at fuel and vacuum lines. check the intake and air box.

your problem is unlikely due to low fuel-- fuel light coming on.

more than likely, you just need to service the vehicle and/or replace parts that have met their service limit.
Wed, 13 Apr 2022 08:51:16 +0000

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Wed, 13 Apr 2022 08:51:16 +0000 linkquote
greasy125 wrote:
I'd say your china petcock has met its life expectancy.
No I just changed it out to an OEM petcock, pretty sure I said that.

but, on a 20 yr old bike I'd be looking at fuel and vacuum lines. check the intake and air box.
As I said, I put a new fuel line on it in 2015.

your problem is unlikely due to low fuel-- fuel light coming on.
I agree, the point is that its a strange coincidence and I was hoping an ET4 owner here would have had the same strange experience in the past and would share what they discovered.

more than likely, you just need to service the vehicle and/or replace parts that have met their service limit.
Okay like what? that junk ass Walbro carb that there are no parts available for anymore?
Wed, 13 Apr 2022 08:57:59 +0000

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Wed, 13 Apr 2022 08:57:59 +0000 linkquote
I'm thinking when I open the airbox i'm going to find a gas soaked air filter. We'll see.
Wed, 13 Apr 2022 09:05:45 +0000

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Wed, 13 Apr 2022 09:05:45 +0000 linkquote
mea culpa, I didn't see that you'd replaced the petcock with an OEM

but fuel line 7 years ago? probably due for a new one and vacuum line. if your intake is OG I can nearly guarantee it needs a new one. if you haven't touched that carb in that long it's due for a look see as well.

ET/LX tank floats are known for being nonsense, so figure that into your equation.

ETA: I own two ET4's and have worked on a few of them
Wed, 13 Apr 2022 09:11:19 +0000

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Wed, 13 Apr 2022 09:11:19 +0000 linkquote
I replaced the fuel line last week when I installed the new oem petcock. I feel like I am not being clear enough. My apologies.
The Vac. line is still the 20 year old original but I snipped the hard ends back to the pliable rubber so they make a better seal on the intake nipple and the petcock nipple.
Wed, 13 Apr 2022 09:18:21 +0000

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Wed, 13 Apr 2022 09:18:21 +0000 linkquote
if your intake is OG I can nearly guarantee it needs a new one.

The intake manifold? its OEM. What happens to them? I thought they were like ....metal coated with rubber on the outside.


if you haven't touched that carb in that long it's due for a look see as well.


When it left me stranded last summer I walked home to get tools (1 mile) then rode my classic back to it and took the carb off and took the bowl off. Due to the fact that I run non ethanol religiously it was super clean on the inside. I was expecting to see a little dirt in the jets but...nothing. The diaphragm looked ok too no rips. It finally started back up and hesitated back home about a mile.
Wed, 13 Apr 2022 09:33:05 +0000

Veni, Vidi, Posti
LX190 Friday afternoon special, Primavera, some pushbikes
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Wed, 13 Apr 2022 09:33:05 +0000 linkquote
Pearl wrote:
The intake manifold? its OEM. What happens to them? I thought they were like ....metal coated with rubber on the outside.
They are solid rubber and tend to crack eventually.
Wed, 13 Apr 2022 09:42:43 +0000

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Wed, 13 Apr 2022 09:42:43 +0000 linkquote
znomit wrote:
They are solid rubber and tend to crack eventually.
ooo i bet thats it! i'm going to look right now!

A GY6 50/150 is a metal piece covered with rubber, I had assumed these were too. I saw this crack last summer but I thought it was like the REDACTED bikes i've seen where its metal on the inside. This must be it.

ETA from G125: that type of language is not accepted or allowed here. please to do better in the future.



Wed, 13 Apr 2022 09:45:38 +0000

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Wed, 13 Apr 2022 09:45:38 +0000 linkquote
Is this the intake that requires the paper gasket or does it have a groove where an included o-ring goes?
Wed, 13 Apr 2022 09:48:11 +0000

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Wed, 13 Apr 2022 09:48:11 +0000 linkquote
Seems I recall sticking my finger in there while I had the carb off and could not feel the crack. Silly me. I'm 51 now and i'm losing some of my mechanical edge.
Wed, 13 Apr 2022 09:52:13 +0000

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Wed, 13 Apr 2022 09:52:13 +0000 linkquote
you keep circling back and editing your posts with additional information.

I'll wait until you've consolidated all the facts before offering up any advice on a repair.
Wed, 13 Apr 2022 09:54:23 +0000

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Wed, 13 Apr 2022 09:54:23 +0000 linkquote
sorry. I think you and znomit both figured it out already.
Wed, 13 Apr 2022 10:03:27 +0000

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Wed, 13 Apr 2022 10:03:27 +0000 linkquote
Pearl wrote:
sorry. I think you and znomit both figured it out already.
your intake is wasted. get a new one and a gasket and you'll be fine.
Wed, 13 Apr 2022 10:20:48 +0000

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Wed, 13 Apr 2022 10:20:48 +0000 linkquote
I started the bike up and sprayed some ether on the crack and the rpms picked up so definitely sucking air there. I smeared a liberal amount of automotive adhesive across the crack, some stuff called GOOP that works really well for lots of things. The petcock should be getting plenty of vac. now! thanks guys!





Last edited by Pearl on Wed, 13 Apr 2022 10:22:20 +0000; edited 1 time
Wed, 13 Apr 2022 10:21:29 +0000

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Wed, 13 Apr 2022 10:21:29 +0000 linkquote
greasy125 wrote:
your intake is wasted. get a new one and a gasket and you'll be fine.
Thanks for your help Sir!
Wed, 13 Apr 2022 10:26:11 +0000

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Wed, 13 Apr 2022 10:26:11 +0000 linkquote
ETA from G125: that type of language is not accepted or allowed here. please to do better in the future.
[/quote]

So what do I say regarding those? SOB's? I don't even remember what I said.
Wed, 13 Apr 2022 10:33:15 +0000

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Wed, 13 Apr 2022 10:33:15 +0000 linkquote
greasy125 wrote:
your intake is wasted. get a new one and a gasket and you'll be fine.
Okay so this is the intake that takes a paper gasket? I saw Robot say ...some years....have a groove where an o-ring goes.....i guess those are lx and newer?
Wed, 13 Apr 2022 10:36:50 +0000

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Wed, 13 Apr 2022 10:36:50 +0000
This post was not quite
What we were hoping to see
Try again, perhaps?
Wed, 13 Apr 2022 14:51:55 +0000

Addicted
2010 S50 Modified "Punkin"; 2003 ET4 Malossi 187 "ISO"
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Wed, 13 Apr 2022 14:51:55 +0000 linkquote
Greetings:

For whatever it's worth, I replaced the Walbro carb on my '03 ET with a Keihin from the later LX models. When I installed the 187cc cylinder I was unable to find jets for the Walbro and despite considerable experience working with carbs in general I was unable to get the Walbro to work well. The Keihin worked perfectly, and even better when I deleted the recirculating system that had some dodgy hoses and probably was creating a bit of a vacuum leak. The Keihin was around $200 at Scooter West, if I recall correctly.


This was my Walbro. Keihin fit exactly and even the bystarter connection was the same. The bystarters are very different and not interchangeable.


Walbro pilot is *just* different enough from Keihin units for them not to work well in the Walbro

Wed, 13 Apr 2022 16:38:14 +0000

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Wed, 13 Apr 2022 16:38:14 +0000 linkquote
Thanks Wheelman, very interesting!
Wed, 13 Apr 2022 19:29:11 +0000

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Wed, 13 Apr 2022 19:29:11 +0000 linkquote
Bike seems to be "fixed". The gas light was close to coming on so I rode until it did and intentionally hit as many bumps as I could to try and get that crack to open but it ran fine. The GOOP shown above seems to have plugged the crack up. I love that GOOP stuff, so useful!
All is well for now! thanks greasy125 and znomit who helped! I feel stupid for not investigating that crack a bit more, I knew it was there! I guess it was lowering vacuum to the petcock just enough to let the petcock close which created a fuel starvation issue.
Going to leave it like this awhile and will get a new intake when I do my 187cc kit later this season....and a LX carb as Wheelman suggested.
Thanks again guys you rock!

Addendum: a tube of GOOP should, in my opinion, be in everyone's road kit!



Wed, 13 Apr 2022 23:33:24 +0000

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Wed, 13 Apr 2022 23:33:24 +0000 linkquote
I spoke too soon, the problem persists.
Wed, 13 Apr 2022 23:47:03 +0000

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Wed, 13 Apr 2022 23:47:03 +0000 linkquote
Was this on fire?
Thu, 14 Apr 2022 09:06:59 +0000

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Thu, 14 Apr 2022 09:06:59 +0000 linkquote
Harry brenner wrote:
Was this on fire?
no
Thu, 14 Apr 2022 10:52:53 +0000

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Thu, 14 Apr 2022 10:52:53 +0000 linkquote
Pearl wrote:
I spoke too soon, the problem persists.
judging by the fact there's two different bolts holding down the intake, I'd suggest that you've got a deeper problem.

gooping up the intake was just a band-aid.
Thu, 14 Apr 2022 11:02:10 +0000

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Thu, 14 Apr 2022 11:02:10 +0000 linkquote
Greetings:

Tha intake bolt discrepancy is actually Factory. One of them is a "breakaway" head mandatrd by some party-pooping environmental bureaucracies to prevent would-be modders from tinkering and ensure nobody has any fun.
Thu, 14 Apr 2022 16:36:52 +0000

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Thu, 14 Apr 2022 16:36:52 +0000 linkquote
greasy125 wrote:
gooping up the intake was just a band-aid.
Yes, just to get me by awhile, but I guess I didnt let it dry long enough.
Fri, 15 Apr 2022 00:14:25 +0000

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Fri, 15 Apr 2022 00:14:25 +0000 linkquote
Wheelman-111 wrote:
Greetings:

Tha intake bolt discrepancy is actually Factory. One of them is a "breakaway" head mandatrd by some party-pooping environmental bureaucracies to prevent would-be modders from tinkering and ensure nobody has any fun.
I've worked on a whole bunch of these and have never seen that. other bikes, sure. but not a vespa.
Fri, 15 Apr 2022 00:16:08 +0000

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Fri, 15 Apr 2022 00:16:08 +0000 linkquote
Pearl wrote:
Yes, just to get me by awhile, but I guess I didnt let it dry long enough.
I've seen people use shrink tube as well.

but really, the best repair is to replace it. and do the gasket at the same time.
Fri, 15 Apr 2022 01:04:31 +0000

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Fri, 15 Apr 2022 01:04:31 +0000 linkquote
greasy125 wrote:
I've seen people use shrink tube as well.

but really, the best repair is to replace it. and do the gasket at the same time.
'Rescue Tape' aka self-amalgamating tape works brilliantly on occasions like this. Even for holes in coolant hoses - but a few zip-ties are needed then to help contain the pressure.

But it's not that expensive to replace.
Sat, 16 Apr 2022 01:16:35 +0000

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Sat, 16 Apr 2022 01:16:35 +0000 linkquote
greasy125 wrote:
but really, the best repair is to replace it. and do the gasket at the same time.
I'm done jacking around with it, i'm getting too old to be able to find stuff that I used to be able to find pretty quickly. I can HEAR the leak but I can't find it. New intake and gasket are on order from Scooterwest.
Mon, 18 Apr 2022 20:46:03 +0000

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Mon, 18 Apr 2022 20:46:03 +0000 linkquote
Found the crack, it was UNDER the clamp. I didnt find it until I took the clamp off to put it on the new manifold.







Last edited by Pearl on Mon, 18 Apr 2022 21:25:45 +0000; edited 4 times
Mon, 18 Apr 2022 20:48:57 +0000

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Mon, 18 Apr 2022 20:48:57 +0000 linkquote
New manifold got here from San Diego to RDU in 3 days flat including sunday. She's back to running great now! Big thanks to greasy125 and Znomit for knowing exactly what the issue was. On the road again!



Mon, 18 Apr 2022 21:23:04 +0000

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Mon, 18 Apr 2022 21:23:04 +0000 linkquote
jimc wrote:
'Rescue Tape' aka self-amalgamating tape works brilliantly on occasions like this. Even for holes in coolant hoses - but a few zip-ties are needed then to help contain the pressure.

But it's not that expensive to replace.
We called that 'Aqua-seal' in the electrical business. I used to have a bunch of it.
Thu, 21 Apr 2022 00:40:51 +0000

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Thu, 21 Apr 2022 00:40:51 +0000 linkquote
Back to square one. The gas light started flickering on me on the way to autozone to get a spark plug for a 2003 Vino i'm working on and the ET lost power, hesitated, backfired and stalled just as before not 10 hour ago. I let it sit for about 10 mins and it fired up. lucky for me I was less than a mile from home. When I got home I sprayed around the carb and intake with carb cleaner just as I did before to see if I could find a vacuum leak....RPM's held steady.

The new intake made it run like new again for one day. I am seriously bummed out.
Thu, 21 Apr 2022 03:29:35 +0000

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Thu, 21 Apr 2022 03:29:35 +0000 linkquote
Going to try this next. Seen plenty of these go bad over the years. This one is for a chinese scooter so I don't think it's going to fit.



Tue, 10 May 2022 00:22:09 +0000

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Tue, 10 May 2022 00:22:09 +0000 linkquote
It flooded out on me today, apparently the float has been sticking in both the open and closed positions somehow. When I take the carb off, take the bowl off and move the float with my fingers it's nice and smooth, no sticking.
Sick of messing with this carb, bought a new one from scooterwest today.
   

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