Post by mommyscooter420 on Feb 16, 2017 23:10:04 GMT -5
hey guys! Ran into a little problem with my 2 stroke. it seems my engine is able to rev up high on its own to the point where I can't stop it with my foot. I don't wanna ride my scoot until I get this figured out! my bbk just arrived and I wanna put it on but not till I figure this one out 😕 Any help would be greatly appreciated!
Post by oldchopperguy on Feb 17, 2017 0:59:38 GMT -5
Hey, welcome to the site!
I haven't worked on 2-strokes since my go-kart days back in the 1960's, but if memory serves me, it sounds like you may have an air-leak somewhere, leaning out the engine so it revs "by itself".
I am not familiar with the engine in your scoot, but our kart motors had the carbs attached to the crankcase, and used a reed-valve opened and closed by the piston "sucking" fuel into the block on the compression stroke, and forcing it into the cylinder from the block on the exhaust stroke.
Any air leaking around the carb, intake manifold, or the crankcase (crankshaft bearing seals, etc.) would cause the problem you are experiencing.
We need someone here with modern scooter 2-stroke experience for advice here...
Post by wheelbender6 on Feb 17, 2017 19:06:11 GMT -5
I agree with chopperguy. Intake air leak. Just tightening bolts and screws usually does it. If not, spray WD40 at likely spots on your intake manifold while the engine idles. The engine will speed up when you spray WD40 into the area with the leak.
"I became insane, with long intervals of Horrible Sanity" - Edgar Allen Poe
Post by oldchopperguy on Feb 17, 2017 22:35:47 GMT -5
I'm so old I'd forgotten the WD40 spray test! Have a bone!
The only difference was we used ether... (mid-century starting fluid...). Definitely NOT recommended today: it can get REALLY explosive REALLY fast... LOL! We just used what the rest of the cavemen had on hand. Many summers, none of us had eyebrows... EEEWWWW!