CEEZ

Thank you, sir.

I agree you wouldn't have change the crankshaft, but being a 1985...the crankshaft bearings could possibly be worn or crankshaft timing sprocket worn. Just use a torque wrench to tighten the flywheel nut NOT an impact wrench. Yes, I am Cayden Cycle from eBay. Why do you ask?

You must be high[emoji3]... altitude that is...

I second ickfinger...you need a ATC200X carb or Mikuni VM26....

These little bikes come jetted LEAN from the factory, to meet emissions. It is always a good idea to go up 1 or 2 main jet sizes and experiment with 1 size up on the pilot jet. that is what I do with all my NEW bikes & ATVs .

Save the headache and hassle change the crankshaft to 1992-2013 and convert to CDI .

That's gettin' TOO low...

The crankshaft sprocket tooth should be lined up with the flywheel key way. The "O" on the camshaft sprocket should be perpendicular to the cylinder head, actually at around the 11 o'clock mark because the cylinder/cylinder head are not completely vertical. Most of the time these crankshaft sprockets are not properly installed from the factory...how did the timing get this far off? Too advanced DETONATION ...

1 FULL quart you will be over full, you may push oil out of the seals or the crankcase tube.... You will probably be OK though.

Use a CR85R, clutch lever & perch probably the same as CRF150R clutch lever & perch. It is a little longer, easier to pull you have to LOVE physics....

FYI 80s have the crankcase nipple for venting horizontally 100s have the crankcase nipple for venting vertically. Also that head is from pre-1979 XL100...

I actually sell a 95cc kit on eBay[emoji106]

Old question probably... If I have a bigger piston with a 13mm wrist pin, can I put a 100 cylinder on a 80 engine. I know there is the oil galley thing, right? If I can't use the 100 cylinder, I will have to resleeve a 80 cylinder. I thank everyone for their input.

I have always had good luck with Shindy pistons. You can call Peak Moto 877-212-7325 ask for Rod or Lonni. You can get a top end gasket kit too. Sizes available 65.50, 66.00, 66.25.

When you get your NEW swing arm, can you post some pictures of it? Thanks.