Hey I have a 85 ATC 200x that I'm in the process of building I'm looking for performance parts especially camshaft. I've got a jug bored to 66.5mm with 10-1 compression piston. And the upgraded valve springs just wondering if anyone my have a nice bump stick they might wanna let go of. The plan for the bike is black frame, engine, tank, plastic except for super scoops. And a red seat cover. Trying to build one similar to what I had as a kid, it was hilarious having people trying to figure out what was done to it.... It had a very rough idle
That's right I forget they sell them that large because I'd not run the sleeve that thin, but I'm sure yours will be fine. Any more pics for us, we love pics.
I don't know, is it? And if you don't mind me asking, why do want to know? It's not like a 350 where you can just buy 1.6 rockers and get more lift. They just dont have room in the rocker box and even if they did they're aren't any options that I know of. Seeing as how the rockers are in direct contact with the cam, OHC engines don't really allow the tolerance that a pushrod design can allow for when substituting rockers with a larger ratio.
Do you have a dial guage? I bet you do. Measure your max valve lift, at the valve itself, then divide that by the cam lift. Presto, rocker arm ratio. Some might suggest doing this with zero valve lash, but it makes no difference. Max lift is max lift, regardless of valve clearance at TDC.
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