2 stroke has spark and compression 70psi and fuel . Just won't fire up.. think its timing but there are no timing marks on flywheel or the crank case so can't assess if it's timing or not. It also has dc CDI and I assume the one wire from stator is trigger? Any help appreciated.

 

70psi is low, even for a two stroke. A dodge that often works with them is to squirt gas from a gas blowlamp up the air intake whilst turning the engine on the starter, use no choke and a clean, dry plug. You can use starting fluid, but that tends to wash oil from crank and bore, so not good for the engine. And yes, the wire from stator to CDI will be the trigger. Engine makers usually put the keyway for the flywheel at the top when the piston is at TDC, on "upright" engines, and the "lump" on the flywheel is going to be passing the trigger coil just before TDC.

 

Thx for your reply . Have tried quick start via the air inlet to carburetor still no go. Fly wheel has no bump on it .cheers

 

In addition there appears to be no external /intrnal trigger sensor. Will try an upload a photo.

 

That different coil indicates a magneto rather than a CDI. Some makers produce a sort of hybrid, Suzuki LT50s were more magneto than CDI. Anyway, if the flywheel keyways line up, the spark has to be at the right time. Clean the carb out, blowing jets and orifices out with compressed air. Check the oil seal on the crank at the other side, the one showing is OK, or the stator coils would have been covered in oil and dirt. If it has a reed valve, check that is working, make sure the exhaust isn't completely blocked. If all these are OK and it still won't fire up, take the cylinder off and check it for wear. If it and the piston are OK, treat it to new rings and cross hatch the bore. Check head and cylinder surfaces are flat. Rebuild, and try again.

 

thx merryman. You’ve given me a lot to work on. Is it difficult in checking the oil seal. I don't have a manual for this atv. Cheers

 

A blown seal leaks fuel/oil mix, so you can usually tell if it has been leaking if you strip far enough to see it. However I would do that carb clean and other checks first and see if it then fires up, if it looks like the other crank seal is hard to get to. It could just be a carb or exhaust, etc.