Hi, I have an 84' CR250 that I got with a blown top end, I had it bored over and I put in a new wiseco top end, new reeds, and new honda gaskets. After riding it for a few minutes it started steaming from the exhaust and stalled. I thought maybe I had got some dirt or something on the gasket surface, so I carefully put in a new moose racing gasket. The moose gasket worked great for a few months and I thought it was fixed until I took it to the dunes, blown head gasket again. This time, I had the head and cylinder surfaced. I put it all back together with a honda gasket and it blew the gasket first ride. The honda shop told me to torque the bolts to 20 ft. lbs. does this sound right? I can't figure it out, any help is greatly appreciated.
keep blowing head gaskets
- Thread starter jake760
- Start date
- Thread starter
- #3
Yes, I torqued them to 20 lbs, then rode it gently until it was hot, then torqued them again. I was thinking about coating the gasket in high temp silicone. I also have a yz490, and I can see where the previous owner used high temp silicone on the head gasket, and that bike doesn't have any problems.
If all else fails, get the copper spray. Older or studs that have been abused, may require replacement or a little more torque. Check the nuts also.
helio lucas
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- Jun 20, 2007
- 1,020
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i don´t know if that model have a head stay that holds the engine to the frame... if it has watch out about the frame may twist in a jump or something and push the head...
- Thread starter
- #6
Yes, I just ordered a new gasket. I think I'm going to try the copper spray, and also leaving the head mount unhooked. I don't care if it makes the bike vibrate a little more. I think the studs are original, should I tighten to a few more ft. lbs. than the manual says?
Over torquing can get in trouble on worn studs and nuts, be careful. Try the spray first.
