must be loosing it [lost it] as i said further up in the posts, my RT1 top end used to go real good [i thought i remembered] but not since re-fitting last week [flat as]. Dummy me--thought to check the point gap [ie ign advance] & barely opening. Gave em a nipping 15 thou & doubled the horsepower. Trouble is--the clutch now slips & in the process i found the left main is [up n down], more likely been spinning on the shaft & grooved it. Mag is a rare one [might be RT1MX] with the advance mechanism. thought i'd be smart & swap flywheels for the normal one but points are mounted slightly further out so i seems. Cam measure about 37mm std was around 31mm so put original back on. Always something new to learn even when you think you "Know It All", can hear "Mr Know It All" sayin--you really should have known!! Another rebuild gonna have to happen sometime. Now i'm thinking 'if only' i'd checked the points when i had the RT3 top end on but in saying that--i think the piston port is a nicer old motor, albeit with a lot more inlet noise. Keep chopping & changing the bike every year or so but has an AT1 tank, PE type forks n yokes, [forks came around & hit the std tank but just miss the smaller one] RM swinging arm & shortened subframe with shocks made of Short Gas Girling [all i had]Medium Damped Shocks arc welded [stand back she could blow!!] into PE bodies to get the overall length & PE spring location. Mums teapot for a K&N filter box & [on & on it goes] Rides nice for a dungga--pro circuit old rm250 pipe that's right. Had longer forks & shocks on [still short heavy damped girlings inside] but was way too tall plus i think it's an XT250 seat which is quite thick & not ideal [all i had]. Sorry about the long story. Cheers.
