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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
CRF150r Expert
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[QUOTE="Rich Rohrich, post: 1281928, member: 16241"] [b]Service Intervals for the CRF150R direct from Honda[/b] These are the service intervals Honda is recommending for the new CRF150R engine. Valve clearance check - After the break in ride and [b]every 6 races or 15 hours[/b] after that. No specific interval on valve or valve spring replacement. We'll be tracking that out here. It should be interesting to see how well the steel valves hold up. I'll be using a high end Rimac spring tester to watch the rate at which the valve springs lose their pressure. This gives a good indication of the spring quality and relative severity of the cam dynamics. Piston, rings, piston pin - [b]Replace every 6 races or 15 hours.[/b] It's a single compression ring slipper skirt piston similar to the CRF250F. It's running clearance (piston to wall) is tight at 0.0006"- 0.0015" , and the upper limit on clearance is 0.003". This is a REAL race engine, [b]it's not a trail bike so "cheating" on the piston maintenance won't be easy.[/b] The cylinder head is built like the CRF450 and uses a separate cartridge type carrier for the cam, and a bolt on cam sprocket. That's great from a maintenance and cost standpoint if a head ever has to be replaced. It also makes shimming the valves much simpler. The bolt on cam sprocket opens up a whole range of cheap tuning opportunities. It uses standard bucket lifters on the intake, and a pair of offset roller rockers for the exhaust. It's a fantastic bike, but this is a high maintenance RACE engine that needs to be treated like one. Guys who skip the maintenance end up with repair bills that cost more than a brand new CR85. [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
CRF150r Expert
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