I have this coleman mini bike with a two stroke sachs motor. It runs great, but raw fuel drips out of the exhaust and makes a real mess.the gas is mixed 24:1, which is what is recommended. What could cause this? Thanks
If it is fuel dripping out I would say you have a carb issue.I have this coleman mini bike with a two stroke sachs motor. It runs great, but raw fuel drips out of the exhaust and makes a real mess.the gas is mixed 24:1, which is what is recommended. What could cause this? Thanks
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It will idle all day so i dont think its running too rich. The plug looks normal. I can run the hell out of it, but it still does it. I have an identical bike and that one does it too just not as badIf it is fuel dripping out I would say you have a carb issue.
What does the spark plug look like?
2 strokes always run on the rich side
If you have fuel tank shut off valve use it, if not buy an inline valve. Sounds like raw fuel draining from the carburetor into the crankcase area where it sits until the engine is started. The fuel not being atomized will be force out during the exhaust stroke. If the muffler has an inner baffle take it out and shine it up on the wire wheel.....check float...check needle valve and seat.
Ok. If the fuel was leaking past the seat, wouldnt it flood out while idling? I do shut off the fuel after each use because it will leak. It has a bing carburetor and i dont think the float can be adjusted. I will check on these ideasYes, that inline fuel shut off in itself will probably cure it. Turn off the fuel when not running the engine.
Clean out the bowl and needle and seat too.
Ok. If the fuel was leaking past the seat, wouldnt it flood out while idling? I do shut off the fuel after each use because it will leak. It has a bing carburetor and i dont think the float can be adjusted. I will check on these ideas
You sure it not just condensation you see dripping.It will idle all day so i dont think its running too rich. The plug looks normal. I can run the hell out of it, but it still does it. I have an identical bike and that one does it too just not as bad
Thanks. Yeah the kids love them because you dont have to shift. They are two speed automaticMy Yamaha Banshee used to condensate really bad at idle. Revving it up would blast a nasty black water and oil concoction all over. And that quad was fast.
I HIGHLY doubt its a carb issue. If the carb was bad enough to fill the intake, crankcase, cylinder, AND exhaust. It just wouldn't run....
That's a cool bike with a sweet engine. I have a moped with a Sach's engine. Also have a Puch powered 'ped.
No its fuel/oil. Comes out at the end of the tail pipe, where the pipe joint is, and makes a damn messYou sure it not just condensation you see dripping.
Collect some in a clear jar and see what you got
Exhaust could be getting plugged and running rich. Might try lowering the needle in the carb. I've taken an acetylene torch to the exhaust and burned out the carbon. Make sure your neighbors aren't home . lolI have this coleman mini bike with a two stroke sachs motor. It runs great, but raw fuel drips out of the exhaust and makes a real mess.the gas is mixed 24:1, which is what is recommended. What could cause this? Thanks
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Looks like sooty condensate to me. I used to see that all the time when I was in the business of motorcycle repair; even brand new ones did it.
When the engine runs right, the exhaust is full of water-vapor, as a byproduct of the energy conversion process. You can see it every morning in cool weather when you warm up your car.
Your exhaust system is running too cool for too long. Suzuki solved that with dual wall pipes, and special clamps with impregnated wiremesh inserts, and underslung mufflers.
For you, I recommend ;
burning out the exhaust baffle
a headerwrap on the frontmost vertical section,
RTV sealer on the joints
and set the idle-speed higher.
The idea here is to keep the exhaust hot enough so the water vapor exits the system, instead of condensing and running back into the low parts. After the muffler fills up with water, it has no place to go but downhill, unless
you blast it out by reving it up, or
drill an exit hole, braze in a spigot, and rout the near boiling water away with a silicon hose.
Your getting drool... 24:1 seems way too much . But if that is recomended .... try a good synthetic oil like Motul and mix 40:1 .
The reson your plugs look good at 24:1 is because the oil is displacing the fuel and actually leaning out the A/F . But the oil is not burning and running out the pipe .
Your getting drool... 24:1 seems way too much . But if that is recomended .... try a good synthetic oil like Motul and mix 40:1 .
The reson your plugs look good at 24:1 is because the oil is displacing the fuel and actually leaning out the A/F . But the oil is not burning and running out the pipe .