BannedCR500Riders.com

hi all

my bike has developed a bad misfire, i have had a few other problem along the way ie a couple of seizures which i found out to be bad machining and a very tight fit on the piston.

i have been through everything so far to try and eliminate the misfire, the only thing i have not had tested ...

Roostius_Maximus wrote:
actually, it was probably right, by looking at the pin we can tell it has seen some heat also.

sorry the picture is a bit misleading, that pin is from my 250 ktm, that had seen some heat tho as it overheated last time out and has just had a top end rebuild

ill take some photos of the barrel/bridge when i get home. When the barrel was bored there was still some relief on the bridge? should i relief it some more?

so i dont need any holes drilled in the piston, is this right?

i not sure im following all the lingo your chatting, wfo? wide f+{}king open ...

cheers bob, maybe a bit too much pressure.

but hopefully thats causing the problem.

Not got a photo of the piston as its back together now, it was scored in 1 place mainly right on the inlet side closest to the lefthand side of the bike

this is what i came up with to leak test my motor.

https://bannedcr500riders.com/images/auto/021a7549bbbede99f8e642a21c4e1e8c.jpg

and this

https://bannedcr500riders.com/images/auto/db0ef988d12b80a457f1ada7a97a9a25.jpg

https://bannedcr500riders.com/images/auto ...

cheers for the advise j, i should be able to knock something up, i cant see anywhere in the uk that sells the motion pro kit.

Thanks for all the help lads, ill try the things you mentioned and report beck with what i have found

ok, so had a chance to spend time time looking at the bike this evening.

checked the jetting again and in my pwk im running a 55 pilot 178 main and 1.5 turns out on the air screw. Its set a bit rich at the mo until its run in.

checked the coolant thats fine too, so im thinking its got an air leak ...

hi folks

Im hoping someone can give me some advise and tell me where im going wrong.

Ive just finished building myslef an afc with a 89 motor. The problem ive got is ive only done about 10 miles on the bike and it has seized twice.

the first time i put it down to the guy i bought the engine off ...