This is the bike that Guy Cooper placed 3rd on in the Mini Moto SX in 2004. I bought it from Guy and he had the engine custom built for the mini moto. Guy also custom made the exhaust himself because there wasnt a good exhaust out there yet. He put a FMF can over his custom step up exhaust. I have added the Fox Air shock since. I am selling because we have a baby on the way and have to get rid of some toys. I bought it from Guy himself. Any questions just ask.
I think if you pull 850 out of that you will be lucky! You might need to post some pictures to prove your claims but if anything If it was one of Guys bikes it was a loaner bike. Cool be wrong but pics = proof
That motor looks to be based on the smaller 90cc job instead of the "Nice-like" 125, with the "regular" SE head, after doing some comparing in the shop. No CR5...