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Post by scootcouper on Apr 24, 2018 9:47:05 GMT -5
Hello all and thank you in advance for your help! I have a 150cc GY6 Scootcoupe trike, when I put it away for the winter, it was running perfectly. When I got it out this spring, it's running poorly. It is starting a little hard, idles perfectly, but is losing power under acceleration, it feels like the engine is missing / running rough.
Here's what I've tried so far:
1) I replaced the carb with a brand new carb off of Amazon -- no difference at all in how the scooter is running.
2) I replaced the intake manifold and all the vacuum lines -- no difference at all in how the scooter is running.
3) I removed the air filter and took a brief test ride, no difference at all
4) I replaced the spark plug, no difference at all
5) I checked the valve lash -- it's where it should be
6) I replaced the fuel filter, no difference at all
My experience is that its either fuel, air, or spark, and I feel I've ruled out air and fuel, so it must be spark. I'm not sure what to check next -- stator? voltage regulator? coil? All three?
Any help would be appreciated!
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Post by tortoise on Apr 24, 2018 12:14:58 GMT -5
150cc GY6 Scootcoupe trike Interesting vehicle . . appears to have a GY6-B engine (2-bolt valve cover). Might verify the muffler outlet is not obstructed with nesting insects. Also observe the running engine in darkness to check for any wiring arcing created by gnawing rodents. An AC-CDI and ignition coil is relatively inexpensive . . "performance" ignition components are typically a waste of money. |
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Post by scootcouper on Apr 24, 2018 12:31:24 GMT -5
Thank you tortoise, yes it's a great vehicle! Tons of fun to drive. It does have a 2-bolt valve cover and the top bolt is right behind a frame member so you can't get a socket on it for extra maintenance challenge. It's also nearly impossible to view the flywheel markings to determine TDC -- I have to use the camera on my phone to take a picture, move the engine fan, take a picture etc.
In terms of your suggestions I did check the muffler and looked for arcing wiring, although my ability to view the engine is limited due to the bodywork on the scootcoupe.
Thanks!
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Post by chewbaca on Apr 24, 2018 16:11:59 GMT -5
I have have had pitting on a valve be full of carbon deposit so it still seals, dry up and flake away after a long time not running.
also rings can freeze up after some down time
so check your compression
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Post by scootcouper on Apr 30, 2018 12:14:00 GMT -5
After eliminating everything else, I replaced the CDI and the coil/spark plug wire this weekend -- problem solved. It now starts up instantly and runs great, so in the end this was 100% electrical.
Thanks for everyone's help
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Post by tortoise on Apr 30, 2018 13:09:49 GMT -5
After eliminating everything else, I replaced the CDI and the coil/spark plug wire this weekend -- problem solved. A perpetual mystery . . what continuity or circuit board element degraded during storage? Perhaps the EMP from a lighting storm zapped the CDI? |
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Post by scootcouper on Apr 30, 2018 14:04:16 GMT -5
Since I also work on 80's arcade games I do know that capacitors are a wear item and eventually degrade and fail. The "C" in CDI stands for Capacitor in some regard so that may be it?
It was a total mystery -- I brought it to a motorcycle shop to keep in their winter storage facility and when I picked it up at the beginning of April I didn't think I was going to make it home it was running so poorly. Most of the opinions I got initially were vacuum failure or a leak in the intake manifold so at this point it should be pretty solid since I replaced the carb, intake manifold and all the vacuum lines!
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