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Honda MX & Off-Road Dirt Bikes
02 cr125 dyno
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[QUOTE="NO HAND, post: 249311, member: 18937"] O.K. I've been studying very carefully Marcus and Steve 125's posts and I'll try to give you my guess of the recommended mods. For 02 he says the air boot is large enough so fitting the 02cr250 boot to the 125 won't be worth it. First, get the head done by Eric to prevent detonation (just head work is very cheap) or run 2 head gaskets. Get a 7mm spacer for the power-valve to correct the blow-bown timing problem[URL=threadid=34681&referrerid=18937](Click Link)[/URL]. [B][I][U]For a mid-top powerband:[/U][/I][/B][I][U][/u][/I][U][/U] it would be: Latest version 02 v-force (it has a large back-plate now 31/38mm), The intake manifold from a 00yz125 is 32/37mm so you wouldn't have to hog out too much to make it fit. You could buy the 00cr125 manifold at 29/32mm which is almost 10$ cheaper and cut the inside to fit the v-force cage back-plate (not 01 the hole is offset). Keep your stock 02 manifold in case you wan't to switch to a low-mid powerband. A 38mm carb would be next. If you are using a 38 mikuni you will have no problem fitting it. If you have a Keihin, you will need to buy the 99cr125 manifold instead of the 00. It's the only way it will fit. That's about it. [B][I][U]Low-mid powerband:[/U][/I][/B][I][U][/u][/I][U][/U] Leave the carb and manifold alone. Get some Boyesen power reeds (resin, cheap). Or maybe the v-force on the low tension setting would be even better. They help low end because they are softer than carbon fiber. Get the cometic thin base gasket, The stock porting is very agressive and suited for mid-top and the thin base gasket will retard timing a bit. Next is a Vertex piston for Husky 00125cr the absence of lightening holes increase crankcase pressure. Last, a shorty silencer adds some low-end snap. That's my guess. How about other's guess? [/QUOTE]
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Honda MX & Off-Road Dirt Bikes
02 cr125 dyno
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