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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Big CRF mods but bad results
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[QUOTE="Ol'89r, post: 1275858, member: 17212"] Bingo. :cool: Pete hit it on the head. You can't determine the degree of improvement on a dyno unless you do a pre-run and then a post-run after making the improvements, ON THE SAME DYNO. Also, if it was a rear wheel dyno, did you use a knobby tire for the test? Knobbys tend to slip on a dyno and don't give a true reading. Put an old worn out street tire on for the next test and you may see a difference. A big bore and stroker will usually improve the torque in an engine but it can kill the top end rpm and HP. If you had been able to take a reading on the dyno before taking the engine apart you may have noticed a big difference in the torque reading but not so big of a difference in HP. An engine built for torque has to be geared and ridden different than an engine built for HP. Try gearing the bike taller and short shifting in the lower gears to keep the bike in the torque range. This is where the meat of your power will be. It is also critical to degree your cam in and check all of the clearances between the piston and valves when setting up an engine like that. A few degrees the wrong way can result in bent valves. Webcam does have the adjustable cam wheels and I believe Megacycle cams does also. Just my $ .02 [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Big CRF mods but bad results
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