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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
kx 80/85
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[QUOTE="Martin Cole, post: 671599, member: 47387"] We've run a full season's MX on a KX85 (big wheels) and not had any problems until last week. It's 2001 bike and did two successful seasons before we bought it. The previous owner left it stock except for a 51t rear sprocket for more pull out of the corners and a Pro-Circuit pipe to strengthen the mid-range. Last week it started making odd noises and we suspected the crank wanted rebuilding. It was just about at that point but the noise was a seized water pump bearing-so its had the full rebuild anyway. While it was stripped we noticed the power valve wasn't opening fully. They can get carboned up - so need to keep an eye on that. Also - power valve actuator can fall apart and create a lot of damage in the clutch casing. The answer, we are told, is to overfill the oil level. It should take 650ml but most people reccomend 700 or a bit more. For best performance change piston and rings around every 12 hours racing use. The KX seems fairly robust to us and my son loves riding it. It handles well and has good brakes. We are pleased we bought it. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
kx 80/85
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