Modern Vespa

Hi lads, after the first service i got
akrapovic exhaust
polini air filter
dr pulley 12g sliders
Pirelli diablo rosso tires (120-70 front and 140-70 rear)
Falco windshield
and sooner bitubo front shock

But i still think the top speed lacks.... can't get more than 115 or 120kmh.
I dont know if its because the engine need more break in (has 1500km) or the guy who did the service install the sliders in the wrong way.
The take off is not too bad but after 80kmh lacks a lot.

thanks a lot for reading me!

I'd say that the engine hasn't properly loosened up after only 1500 KM. You'll start to see greater speeds in the 1000 KM.

Also, I don't know how large that windscreen is, but if tall, it can create aerodynamic drag that the bike cannot overcome.

dont get this part haha!

do u mean after 10000km ?

my windshield is this one

Probably she needs more rollin' . Im waiting for the malossi variator and Malossi TC lamda as well. Will see what happens

[quote="vitopesich"]Hi lads, after the first service i got
akrapovic exhaust
polini air filter
dr pulley 12g sliders
Pirelli diablo rosso tires (120-70 front and 140-70 rear)
Falco windshield
and sooner bitubo front shock

But i still think the top speed lacks.... can't get more than 115 or 120kmh.
I dont know if its because the engine need more break in (has 1500km) or the guy who did the service install the sliders in the wrong way.
The take off is not too bad but after 80kmh lacks a lot.

thanks a lot for reading me![/quot

Hi,
140 rear tyre is a performance killer, and your rollers sound a tad too light, the single most performance improvement mod is fitting a malossi v4 head.
Fine tuning the variator is not just to improve take off, get it wrong and your engine will be out of its power band soon after the vario is mixed out , thus affecting the acceleration from then on, you should ideally tune the variator to have the engine holding its revs in the powerband just as the variator is at its max range.
Cheers Andy

Thanks andy !

My mechanic told me something similar as u... Cuz I've aftermarket exhaust, I should install malossi variatior and the TC lamda.

Already order it so we will see.

I am in the same situation. My GTS300 FL has now done 3000 km, and still has a top speed of 125 kph (speedo). My scooter is equipped with an Akra exhaust (no catalyzer) and Dr.Pulley sliders 14 grams.

I have tried a Pollini variator, but it caused belt rubbing and crankcase oil leakage. I left the Polini white contra spring in the clutch when I converted back to the Piaggio variator and fitted sliders. Maybe the stiffer spring is preventing the variator from getting into "top gear".

Mike

Mike i bought the TC lamda, multivar2000 and malossi clutch springs... im gonna try the yellow or the red one. Maybe my mechanic is right and she need more fuel. My last scoot was a kymco b&w250 with polini cylinder and polini variator and she had better top speed for far.

As a reference, the top speed of a *stock* 300 with flyscreen is 84mph (~134kph), but it takes a long time to wind up to that from 75mph on the flat with no wind.

That's what I need. A reference from stock. My bike definitely has problems with the transmission or the engine still new

vito, as said, the motor won't be properly run in yet. Conforming will be ongoing for another 3-4,000 miles (not km). So she won't be producing full power and best economy either just yet. I dyno'ed a new GTS300 with 1100 miles on the clock last year and she was about 8% down on factory figures for hp output. Dyno'ed it again at 2500 miles and she was up by 4% on factory figures! Damn good in my book. But don't thrash it too soon as that can affect the total engine power output in a negative way later.

Thanks a mill !!! So i dont have to be worried about it... just ride a wait a lil more.

Hi mike,
I run the polini variator , blue spring, yellow clutch springs, standard clutch, kuber crank, Malossi 282 kit, .tc emulator, v4 head ported and superflowed, k&n double pod filter Dr pulley 13.75 sliders , special 357 mag cam profile. Malossi upgear kit And a 824mm GT200 BELT.
Have seen over the ton gps, routinely reaches 90mph gps on the motorway,
It seems the more it gets thrashed the better the performance gets, the .gt belt is as structurally tensile as the gts belt, the ribs are for cooling, i fitted a gilera runner transmission duct and snorkel intake tube, it forces cool air from under the scooter into the transmission case, i have taken temperature readings before and after without the ribbed belt, it actually runs alot cooler than stock.
With the added overange variator gearing the scooter pulls hard to 82 mph before plateauing and slowing down in acceleration with the gps speed rising in direct parallel with the rising engine speed.(fixed gear variator mixed out).
Cheers Andy

So Andy, i should try gt200 belt ?

Hi,
You only need to fit a .gt200 belt if you are planning on running an aftermarket variator WITH Dr pulleys as without changing it , your sump gasket will get ripped right out especially with the longer 824mm belt fitted.
Transmission tuning will not improve engine power, but it will if carefully set up produce seamless acceleration to terminal speed.
Cheers Andy

thanks for the tip ! the gt200 could be an aftermarket or the original one?
is plug and play ?

What about if i use the malossi variator with malossi rollers? would be the same?

thanks again bro

Hi,
There is no reported problems using any particular make of rollers, it's the sliders that cause the problem, the aftermarket variators be it polini, Malossi, zeloni , Dr pulleys etc all push the belt further up the front pulley than the standard variator (more top speed higher gear ratio), the Dr pulley slides also push the belt further up the front pulley so when both are married together the standard ribbed belt rubs the transmission case and oil sump as it is pushed so high up.
Dr pulley sliders also give a lower gear ratio on take off, as the belt runs lower than rollers in the front pulley so acceleration is better.
Dayco belts are oem and kevlar , they imo are the best belts on the market.
Cheers Andy

Cool andy, but if i wouldnt used sliders should be fine with the stock belt? or i should replace it? i mean... that belt has just 1500km..

You only need to change the original belt if fitting a Malossi variator AND Dr pulley sliders.sliders
The two if fitted together give a potential added 15mph top speed at variator maxed out.
Cheers Andy

Sounds interesting...

maybe when the variator arrived I can try it with sliders and gt200 belt.

Mines are the 12g. do u think they are too light?

Put it back to stock (exhaust and all) and then try it. It'll give you a benchmark against which to weigh your 'improvements'.

thanks again !! i will try as soon as i can

I'm a newbie to my 2010 300GT, 1,150 miles and I weigh 215# with a Fasco TwinScreen I just installed. I was on an Interstate Monday and it easily pulls to 75mph and slowly to 80 and after a bit hits the peg at 84 indicated.
Stock everything except w/s.

So that will be about 77mph then gps ,

Andy

So something is wrong in my bike...

I would say your air mixture to fuel ratio is all over the place

you have changed the exhaust and air filter to let more gasses out and air in but the fueling system is the same so wont get as much fuel

check the spark plug to see what it looks like


tuning a scooter isn't just about bolting on shit

I have never really understood all this performance enhancing nonsense. If your vehicle doesn't suit then get rid and buy something that does. Clearly the poor bugger is concerned about how fast his GTS goes for some reason and he's faffed around with it, at no inconsiderable expense, and ended up no better off. I'd put it all back to standard, flog the ''performance enhancement'' gear to some other mug then just enjoy the GTS for what it is. If he's still unhappy then chalk it up to experience, swap it out and move on my son. Personally, as an ex big bike owner, I reckon, pound for pound the GTS is a a fantastic performer, I never fails to impress me and it makes me smile all the time. Very few vehicles do this, if the OP is on a mission to alter the stock bike so much he's failing to 'get it'

And what right have you to declare that our hobby in nonsense, and call us "poor buggers"?

Sure, the GTS300 has great performance. But squeezing that extra bit out of it is a game a lot of us enjoy. Vespas are tuned to meet European emission guidelines, and for economy, not for performance. The same cylinder head is used on 125cc, 250cc and 300cc Vespas. and fitting a Malossi head can give a real boost.

Try riding a properly tuned GTS300 and you will be amazed. Sure, it is expensive, but that is our hobby, and it's a lot cheaper than golf!

And it is not all about horsepower. There is a lot of tuning being done for brakes and suspension and comfort too.

Mike

Those are fair points well made, I consider myself suitably chastised. I never really though about it as a 'hobby' per se.
BTW I used to live in Oz, Brisbane, and had a great time as a lad, great place to be.

I had a ZX10R 2014 and FZ6 so I think I know a lil bit about "top speed"
It doesn't matters, im just worried about this vespa cuz Ive been watching many videos and reading many threads talking about 140kmh average top speed and mine doesn't even get 120kmh

Just wanna know if my bike has some issues, or need more rollin or whatever...

My stock GTS 300 will touch 80 mph on a good day, that is 128 kph mostly it does about 75 mph, about 120kph. Downhill I once saw 90 on the speedo, or 145 kph but that was downhill! I would think that 130kph is about average.

So you spent a gob of money to slow your machine down from stock?

My philosophy for modifying anything (cars, bikes, guitars, trousers...) is to address specific perceived deficiencies.

In other words...if it ain't broke...


PS...my dead stock GTS250 (flyscreen) with 17,000 miles (28,000km) will run all day at 115kph, and easily top 130kph on the flats if I want to (but I don't).

P.

And my modified PX200 could sit on 130 kph all day! So nyaah!!!

And it wasn't broke. It was just slower than my previous P200, which it turn was slower than the Rally200 before it. So I mended it.

Another stock is best, from the daring socks and sandle brigade,

What we do is no crime and hurts no one,so maybe when other like minded people ask for help with tuning, why don't you keep your silly unhelpful comments to yourself and stick to posting on subjects you actually have knowledge of (actual knowledge not hear say)
Cheers Andy

I WAS thinking an aftermarket exhaust BUT given the potential for a "teddy bear" attack, I may not or at least to do it under cover of night...
And thanks to our elegant UK wordsmiths, there's hope for the language if not the farkle market...

Hi mate,
An aftermarket exhaust will do zilch, nill , nowt to gain hp on a 4t motor, all you gain is noise, looks and styling kudos and an empty wallet, even a pm tuning with its pigtail curls doesn't give a noticeable power increase, trust me i have tried most.
Cheers Andy.

I'm not into noise! My BMW sounds like my Mom's Singer treadle sewing machine when I was a kid. I'm looking for a nice throaty sound with low decibels. Looks don't matter here abouts as they don't know a Vespa from a Chinese off brand scoot, or even my MC for that matter-"they make MC's?" is still the thing at the pumps. After over 50yrs of riding it's about the ride, health and safety.

I'm not in the "stock is better" camp but agree with JimC that taking it back to stock would allow you to determine if the issue is with something you have changed. Then, with a known starting point, you can apply each modification one at a time and assess if each is better or worse. Keeping good notes at each change will help you revert when the change does not improve performance.

Short of that, consider verifying the size of the sliders is correct. If you install the 20X17 (intended for the GT200) in the 250 or 300 you will see a huge loss of top speed. The 250 and 300 need the 21X17 sliders.

I'd leave things a little while and then get it dyno'ed to see what's going on. By all means take a spark plug reading after a power run, but you really need it on the dyno for a proper run to see what the power curve and output are like. With altered air in and gas out, you most likely need some fueling and ignition tweaking. Easily done but just get at least another 500-1000 miles on her first. If you have spent money on some tuning parts already, then setting things up properly is the next best step. You have reduced exhaust gas pressure and likely losing some of the new fuel charge to exhaust on each cycle at high throttle settings. This lowers power and increases fuel consumption. That's at worst the likely issue. At best it's just you need to run her in a bit more as I said in my earlier post. But it never hurts to dyno a bike to see what's going on. You just need someone with an inertia dyno. It normally doesn't cost much. You can have it done with the standard parts on, and then the 'improved' sporty parts. Likely you may see a dip in performance with the sports bits on. So some tweaking may be needed.

Yup and some sympathy from irate neighbors regarding the size of your penis.