Vespa et4 barnfind
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Member
et4
Joined: 12 Oct 2018
Posts: 14
Location: devizes
Tue Jul 09, 2019 11:09 am quote
Almost back on road, but it idles and revs but when try to ride it just goes a few feet and stalls. Tried cleaning carb, new fuel tap and lines, help please.
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 37558
Location: Pleasant Hill, CA
Tue Jul 09, 2019 12:27 pm quote
It's almost certainly fuel starvation - check main jet clearance and accelerator pump. If this is only with the engine cold but it's OK when engine is hot, check the valve clearances. Actually, it's probably worth while doing that anyway - it may have been part of the reason it was neglected in the first place.
Member
et4
Joined: 12 Oct 2018
Posts: 14
Location: devizes
Tue Jul 09, 2019 1:28 pm quote
Cheers
Will start with air filter as no carb slide, must be air flow that lifts reed valve to let in more fuel, new reed? Check manifold for leaks, compression test and valve clearances, would plug tell me anything.
Hooked
2005 et4
Joined: 23 May 2015
Posts: 426
Location: oshawa ontario canada
Tue Jul 09, 2019 4:08 pm quote
reed valve??? Isn't that for a 2 stroke, not the 4 stroke ET4?
Member
et4
Joined: 12 Oct 2018
Posts: 14
Location: devizes
Tue Jul 09, 2019 11:22 pm quote
Yeah, my mistake, talking about diagphram or membrane, no throttle slide as on old carbs, throttle just operates a butterfly valve to lets in more air, the fuel is regulated by a needle in a tube, this has a plastic air float that is attached to rubber diagphram, when throttle applied more air goes through carb, airfloat pushed up and more fuel allowed to.engine, if diadpram is too rigid with age or damaged it will not rise and not enough fuel will be drawn into engine, could also be clogged air filter, or valve adjustment or compression not drawing in enough fuel air, or leaky carb intake, or clutch gear related, im thinking
Member
et4
Joined: 12 Oct 2018
Posts: 14
Location: devizes
Wed Jul 10, 2019 4:04 am quote
Air filter came off without a fight, was drenched in oil and oil ran out everywhere when i opened it up, hoping this was issue not sure how it got there, any ideas? WOULD LYING SCOOT on side do this,like when i welded in new belly pan, let you know if it runs better when i get it back together.
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