if you call and bitch, they are likely to send a replacement peddle free of charge if it indeed is defected.. They are pretty good about that. Just will be more down time being you'll have to ship them yours for inspection first.
Even if your gauge is correct, the quad still should run on 100psi. Might be hard to start do to lack of compression, but once it runs, it should stay running. But that is too low of compression if gauge is accurate.
What make gauge did you get? A lot of the times cheap compression testers are notorious for giving false readings even when there band new. Ive seen them be as much as 40psi off. Also, was the "tip" of the tester as long as a actual spark plug? If not, that will also give an inaccurate reading.
You cold seized it. I did the same thing a handful of yrs back. Motor was also done by jeff. Piston/wall clearance was on the tight side and i didnt put enough heat into it before treating it dirty.
Clean up the sub frame where the stock silencers bolt to. The stock cdi and voltage reg were located by seat latch. Cut all that off. The voltage reg can be relocated up front with your cdi. There is a thread made somewhere on here with tons of pics of frames all cleaned up.
And further more, my original comment wasent even directed to you or your sales. It was directed toward deuce and his comment. I know you sell tons of parts with good feedback. So,,,,carry on and bump for nice parts.