Boring a clyinder over really doesn't make that much more power, most of the time you adding max 30cc's before you need to relseave, most big bores start with adding about 40-50cc's and depending on the kit you get, and other stuff you can add 100cc's or more. The biggest you can bore the stock cylinder would be 69.5mm, this is why you need a sleeve installed. ![]() Most cylinders you can bore up to 2-3mm over, a big bore involves a new sleave put in the cyinder, as to use a much bigger piston, stock bore on a 85-89 250r is 66mm, a 295 big bore is a 72mm piston. Man your good you got any 84 200s mods that wont cost me my arm and my leg? Pm me for a list of mods and how/what I did to my 86 atc200x. As for the pegs.86/87 trx250r roll design pegs fit into the peg plates and are far superior. Also Dg sells a 27mm carb, Cobra and Dg sell a pipe(I have a cut down cobra header and 350x supertapp on mine). This what I would do, 350x tripple trees, 350x front end(or 83/84 250r, if you want a sharper turning), 83/84 250r extended axle, 400ex hubs, you will need a 38t(or what ever size you want, made for a 83/84 250r(sidewinder and sprocket specialties), the 83/84 250r carrier looks like it will fit, its very very close, I didn't try the 83/84r carrier, I had to file down some of the chain adjust tabs on 86 200x carrier to clear the sprocket bolts. ![]() ![]() I don't think you can get much engine work for a 86/87 200x anymore, Piston, cam, port/polish, bigger valves, but the strokers and big bores aren't around anymore,unless you send your motor to Tc racing and spend big bucks.
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