Hi there guys. I have an 1989 DT175 which I purchased for a reasonable price from ebay. The guy mentioned the bike has low compression but I chose to purchase anyway. As soon as I got it home I stripped the carbies and gave them a complete clean out and I discovered that a green cloth was being used as the air filter (thus justifying the clean out XD) anyway.. I measured the comprettion and it came in at a whopping 65PSI.. pretty sure its meant to be around 110-120 but I'm not 100% sure please correct me if i am wrong. The bike was running at this point, not idling very low and it lacked power I pulled the top end off and took out the piston. The piston said "50" on it which might be stock. I only have an imperial caliper so the following measurements are for yall 'mericans The gap for the piston measured in at 2.6170 inches and the piston 2.6000. My main question for this post is: Am I able to get away with putting in 2 new rings on the old piston and putting everything back together or must I get it machined or honed up to a new spec with a new piston? I want to achieve a higher compression. any help is much appreciated and I am very interested in any other information on this bike Thanks guys.