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Honda MX & Off-Road Dirt Bikes
04 CR250 new piston questions
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[QUOTE="Wilky, post: 976607, member: 56599"] I put an uncoated Wiseco piston (no holes) in my 04 CR250 about 6 months ago, it has about 30-40 hours on it and it is still running strong. Like the previous poster said the holes are insurance to help get some lube where the piston and port bridge meet. Although I do not see how this could help much because the bridge on mine was clearly machined so the piston never makes contact with it. Since I am the original owner and the only one that has had it open, yours should be the same. If this is your first top end here are a couple of things to note: Read the cylinder prep thread in this forum, it has some real good info in it. Remove both radiators. It is a whole lot easier removing and installing the cylinder with them out of the way. As soon as you get the cylinder off put a clean rag around the rod to cover any holes that could let anything get in the bottom end. Do not remove this rag until the circlips are in and you are ready to put the cylinder back on. Use a wire brush the get the corrosion (if any) off of the head bolts. Do this with the old head gasket installed between the cylinder/head surface and the wire brush so you do not scratch the cylinder/head surface. You will need to gap your rings. I gapped mine to .016", I think the service limit is .022" Verify these as I am going by memory Getting the power valves out to clean them took some patience. I used a utility knife blade to scrape the carbon of the PVs because I didn't have the patience to use the oven cleaner others suggest. Now a couple questions for you. I see on your list of mods you have a Kouba lowering link and am wondering what you think of it. Which one did you get CRF2 or 3? Did it have any negative effects on handling? What did you do to the front end to compensate for the lower rear? [/QUOTE]
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Honda MX & Off-Road Dirt Bikes
04 CR250 new piston questions
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