I have a yz80 and i cant figure out how to pull the flywheel

Question edited for clarity, add maker.
Question moved to Category.

Check out the link. It it backfires through the exhaust the timing is retarded and firing too late.

https://www.google.com/search?q=yamaha+yz80+set+ignition+timing

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Need to know if it has points or is it electronic ignition first

this is really a simple problem to fix. Pull the gear box and turn the clutch pale around because the plate hub centre is hitting on the flywheel stud heads . The clutch plate only go in one way.

Try the 1990 YZ 80 factory replacement part. That's the only one that will do the job right.

Remove transmission,remove flywheel.Seal is a one piece seal,external.Pry out old one ,lube inner surface of seal and re-install.Replace flywheel and trans.

If you do not know what you have done, well best way is to get it to a shop and have the professionals do the job.

look on the engine, there will be marking on it for the 'cc' if a yz80 it will prob be '79cc' and if yz85 it will prob be '84cc'

The starter clutch is on the back side of 
the flywheel rotor. It has some little springs
and rollers and only turns one way.
When the parts get worn it starts to slip.

Be careful as you can get the rear
camshaft and valves out of time in there too.
When the "T" mark is aligned the
cam sprocket mark should
point straight up to the top center of the head.
If not, the valve timing is out and you
need to either move the gears or chain
to align it all.