Jonway Galactica Starting Issue By swartlander (Read 712 times)

[swartlander]

Hi there . Scooter make and model-Jonway Galactica, model QMJ 157 GY6. Here is my situation. My son was riding his Jonway when all of a sudden it just stalled and died. He said the scooter acted as if he switched on the kill switch (which he did not do) and the was a strange smell coming from the scooter. Loaded scooter on van and brought it home to find out that the kick starter was jammed. Took apart and fixed. Now the scooter won't start. I have spark, fuel and compression (finger in spark plug hole test). The engine cranks on both electric start and kick start but will not run. I have checked the connector plugs leading to the CDI with a digital multimeter, all readings are good. I have also swapped out the CDI, no go. Took carb off, cleaned all jets etc, no go. Adjusted valve clearance, no go. Remove spark plug and the tip is moist.

Question, if the starter gears jammed on the crank shaft, could this have caused the timing chain to "skip" one or two teeth on the camshaft sprocket and thereby getting the ignition time out?

I am at my whits end and don't know where to look anymore to find the fault. Will appreciate any response, questions or advice.

Thanks in advance

[Alleyoop]

Are you sure it is getting spark since you mention the plug after cranking is wet then IT IS NOT FIRING no spark.
Take the plug out or use a spare and take the boot off the plug on the motor and stick the plug in and HOLD it on the MOTOR NOT THE FRAME, sparking on the frame means nothing the motor has to be grounded and it has to spark on the motor otherwise it will not fire when in the motor. IF not spark holding it to the motor check the GROUND WIRE going to the motor as well as from the battery to the FRAME. Normally a wire from the NEG Post on the battery and a WIRE usually on one of the VALVE COVER bolts go to the same SPOT ON THE FRAME.
Alleyoop

[swartlander]

Thanks Alleyoop for the reply. After removing plug i clean the tip, insert the plug in boot and hold it against the valve cover/motor (there is a ground wire attached from valve cover to frame), kick start and there is spark. As per my initial post, the only thing left to check would be the ignition timing. When i adjusted the valve clearances, i noticed when turning the flywheel onto the T mark, the camshaft sprocket holes (two small ones) did not align 100% parallel with the cylinder. Hence my question "If the starter gears jammed on the crank shaft, interfered with the sprocket on the crank and possibly the cause of the scooter stalling and at the same time could this have caused the timing chain to "skip" one or two teeth on the camshaft sprocket and thereby getting the ignition time out?
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[swartlander]

Well well, what do we have here. The scoot was bought on Gumtree, so as they say, so as they say, you don't know what you are getting. Scoot had a bad oil leak so i decided to investigate and look at what i found. Problem solved, no more questions needed. Going to replace top end and hopefully she will fire up right away!

[jerryscript]

May that old top end RIP. Good luck with the rebuild!

[cyborg]

I would check the wrist pin bush real good before I'd put the new piston on,,,,that mill looks like it was run dry of oil,,,,,,

[swartlander]

Thanks for advise Cyborg, will take a look. Do you mean the wrist pin that goes "through" the piston and is there supposed to be a bush (conrod top end)?

[swartlander]

Cyborg, on second thoughts. The damage on the piston and sleeve was probably caused by dirt. I stay on a farm (you guys call it a ranch) just outside Cape Town, South Africa. A while ago i lifted the cover off to check carb and noticed that the air filter box had come off the carb. You live, you learn. So guys and gals , just check every now and then that the box is attached, especially if YOU stay in areas with dirt roads! 

[swartlander]

Ok, piston seized due to heat. Tried removing wrist pin to remove piston, but it's stuck. The piston moves freely sideways on t he wrist pin but is stuck at the ends where the retaining clips are. Tried the threaded bolt with plug spanner method, does not budge. Going to heat the wrist up with heat gun and see if that does the trick. Would like to know why she heat seized, there is enough oil in the motor. Could it be that the oil pump has gone bad? 

[cyborg]

I have a press for the wrist pin,,they can be a royal pain,,once you get it out give that rod small end the long look,,,I'd hate to see you get her back together with a wonky little end,,,,cause of the seize? Just hot,dirty,old oil ( needing change and lubricity gone),,,, weak oil pressure,,BAM !!!! Instant seize