I squirt oil on top of piston and it put compression up to 110-115psi

 

It needs to be broken in. It's not going to seal up until the rings wear into the cyclinder.

 

How would you get it to start with only 60 psi?

 

barely, it needs a lil layer of oil on the cylinder walls to help seal the gaps in the rings. Another squirt or two of oil won't hurt.
Make sure you have fresh gas and clean carb.

 

I've had two strokes run on as little as 30 P.S.I.!! Not great, but it ran! And ,yes the oil trick works.

 

Compression problem solved

I beleave I found the problem, 76mm piston with 75mm rings in a 75mm bore

 

Ok , that's a new one! How did you get a 76mm piston into a 75mm hole????? It has to be a 75mm piston in a 75mm hole or the other way around. I believe the wrong rings were included. Happens a lot.

 

I'm sorry this how it goes... Part number on piston matches to 75mm, piston size matches to 74.5mm and it was in a 76mm box

 

Should be getting mine back friday, intake boot ripped and melted piston, sent it to summit racing, $145 for a bore and new piston

 

Gotta 1999 Polaris 300 two stroke 4x4 .. running fine then at 3/4 throttle in 2 wheel high it just quit and then when I tried to restart by electric start the starter would not turn motor over so I pulled recoil starter cord and it wouldn't budge til I gave it a good yank. Turns over sound like its got compression but wont run has fire and gas. If any one could give me some info or just their input would be appreciated . PEACE