Should this be enough compression for a cold start? This is a fresh rebuild with 2mm RA seals and springs, all new seals. Side seals clearanced to .004 to .006.

Compression is 74 to 80 PSI on all faces, checked with a rotary compression tester.

Used rotor housing and irons that speced out.

Tries but will not start. I have done a bunch of these in the past and never had this issue before.

Any input would be appreciated.

 

assuming youve already checked fuel and spark? did you add any oil like MMO for first start?

z

 

I use MMO on the iron faces.

 

Maybe I should have worded this better. I am looking for opinions on the compression numbers in relation to getting it to start without ATF.

 

It's very low compression and I'm not sure how much it will come up after break-in.

Having never used MMO in any of my rebuilds I can't really comment on that. I don't understand why people don't use 2-stroke to assemble.

I would pull the plugs and make sure they're clean and dry.
check the obvious things - fuel, spark, timing.
Rotate the engine a few times with thee plug out to try to evacuate the MMO and try again. Maybe try pull starting? I've never had to do that either.