gy6 project hard start By stellarfoxy (Read 2,371 times)

[Alleyoop]

You say you have spark, when your testing for Spark Are you holding the Spark plug on the Valve Cover or the Frame. Reason I ask is it may Spark when the plug is grounded to the frame BUT if the motor is NOT grounded to the Frame the Spark Plug will NOT FIRE when in the motor.
Also make sure the KILLSWITCH is on the run position, if some wiring was done to it maybe try cutting the KILLSWITCH wire on the CDI, cut it about 2 inchs away so you can again splice it after the test.
Or if you can reach in the KILLSWITCH slot and unhook the tab and then pull the wire off the PLUG.

[stellarfoxy]

hello again! after double checking everything mentioned here, I installed a new head and cam just to be sure I replaced damn near everything on the engine, because why not! turns out I had too much oil in it. very stupid I know, but the stick measured at the top, and as I removed oil, it stayed at the top until I pulled about 10oz out. so it's running now! the cam I got apparently has the a9 lift/duration (much bigger lobe than stock) and it's still very hard to start. it took at least half an hour today to get running, even with starter fluid... it kept firing but not actually cranking to run on it's own. eventually it started and ran fine, checked the plug after warming it up/revving to set the rings and it was grey and didn't smell of fuel. I feel I need to set the carb or rejet possibly (idle screw is 2.25 turns out, it started best with it that way). it was a little cold out today so I attribute it to that, as I've tested the idle enrichment gizmo and it's prefect. the carb is brand new, and I have another brand new one from before. any suggestions on a hard start? I know it's been covered a lot but fresh rebuild, 140psi compression, has spark/fuel, oil level correct, etc. I'd think it should start relatively easily but this is my first scooter and first rebuild of anything, any suggestions are helpful.

thank you for everything so far!

[stellarfoxy]

As the weather has improved, so has starting times. I think it just had to break in or something, it starts now in under a minute from cold and immediately when starting warm. it revved smoothly but kept shooting flames from the muffler on deceleration, I changed the carb jet from what appeared to be a 100 (it was unmarked) to a 110 and that seems to help, much less fire from the muffler now.

Front fork seals are leaky, once I get that straight it should be ready to ride!

thanks to everyone for the diagnostic pathways!