New Rider
Currently Offline
Waiting for my BBK;;:
Posts: 16 
Likes: 1
Joined: Feb 7, 2017 4:10:47 GMT -5
|
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...
Shouldn't be too difficult to diagnose and fix...
Ride safe!
Leo in Texas
|
|
|
|
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.
|
|
|
|
Post by oldchopperguy on Feb 17, 2017 22:35:47 GMT -5
Thanks Wheelbender6!
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!
Do be careful!
Leo in Texas
|
|
|
|
Post by cyborg55 on Feb 18, 2017 22:35:57 GMT -5
It be an airleak
|
|
|
|
Post by pistonguy on Feb 19, 2017 8:42:07 GMT -5
Air Leak....... CRANKSHAFT SEALS.................Spray them with the WD or I prefer Ether.
|
|
|
|
Post by cyborg55 on Feb 19, 2017 10:37:13 GMT -5
There's a bone for piston right there,,,I forgot about 2t's seals
|
|
|
|
Post by rockynv on Feb 19, 2017 19:06:23 GMT -5
Crankcase is part of the intake on a 2 stroke. If the shaft seals are going the bearings may be on their way out too.
|
|
New Rider
Currently Offline
Waiting for my BBK;;:
Posts: 16
Likes: 1
Joined: Feb 7, 2017 4:10:47 GMT -5
|
Post by mommyscooter420 on Mar 13, 2017 1:53:23 GMT -5
Didn't seem to be an airleak. I did a leak down test. I think my idle was too high. That seemed to help the problem
|
|
Freshman Rider
Currently Offline
Posts: 82 
Likes: 4
Joined: Mar 18, 2017 11:12:13 GMT -5
|
Post by 125scooterbro on Mar 25, 2017 17:02:35 GMT -5
Didn't seem to be an airleak. I did a leak down test. I think my idle was too high. That seemed to help the problem About to say that |
|
