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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
CR125 running like hell even with mods
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[QUOTE="pl690, post: 1423835, member: 86589"] First install a new spark plug..BR9EG @ .024 gap. Plug gap doesn't affect performance so much as long as it's in the .022 to .024 range. Once a plug is failed it can't be cleaned. The BR9EG works best for my 125 and believe me I've tried them all. Then I would check compression just to rule it out. It's a lot easier than a leak down test. You should have about 170 on a warm engine new top end with a 134 kit. Any thing less than 150 something isn't right. If the right crank seal is leaking it will appear as running rich because trans oil is bleeding into the crankcase. If the left side is bad it will appear to be running lean. These bikes are notorious for bad crank seals even from the factory. I jetted the **** out of my 05 until I had the lower end rebuilt with both crank seals replaced and that was the biggest fix I could have ever made. It cured all my jetting issues because the right side was leaking trans fluid and fouling my plug. I would also talk to the previous owner and find out what fuel and mix ratio he or she was running. I run 93 octane 32:1 in a stock setup but I yanked that POS mikuni and installed a Keihin 36mm Quad vent. Now the bike rips. Not sure tho if that carb is big enough for a 134 kit. I had a 134 kit and hated it. Next rebuild I would go back to stock. Unless You put in a new high performance crank with a new crank arm chances are you might snap the crank arm in half (speaking from experience...lol) From what I,ve been told by the shop that rebuilt my lower end, the stock crank isn't designed for all that extra power. Also, I think the 03 has the electronic power walve so the cable has to be checked periodically and adjusted. There is a cover on the left side of the cylinder to check the slack. If all else fails...buy a YZ! [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
CR125 running like hell even with mods
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