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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
crf150 seized.
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[QUOTE="Rich Rohrich, post: 1349392, member: 16241"] New riders often downshift and use the engine to slow down. If you down shift far enough with enough load on the rear wheel, it's easy to have the rear wheel drive the engine way past the redline. When the engine is being driven by the rear wheel, the rev limiter can't stop it from revving sky high. Rev it high enough this way and the valves will float. When you float the valves they don't seat when they should, which effectively retards the cam timing. The piston chases the exhaust valve closed near TDC and if the exhaust valve doesn't get settled on the valve seat in time you end up with the exhaust valve closer than normal near TDC and they'll hit the piston. A sure sign that an engine is being over-revved and floating the valves is bent exhaust valves. Patman's son did the same thing on his hot rod XR95. Patman explained what was happening to him and it was never an issue again. A bit of rider education might be in order once the engine is repaired, so the kid doesn't have this problem in the future. The 150R is an incredibly well made and stout little engine, but like anything, if you abuse it from lack of maintenance (even inadvertently while riding) , you'll break it. [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
crf150 seized.
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