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rm250 kart engine
Started this discussion. Last reply by Darryn WAUGH Nov 4, 2009. 9 Replies 0 Likes
hi all , i have an rm250 engine on my kart , and it keeps seizing , i just had it fully rebuilt and i ran it in , then it only done a warm up lap and then one fast lap , then nipped up in the bore…Continue
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Darryn WAUGH replied to jamie ruddle's discussion rm250 kart engine"Hi Jamie ..... its hard to entirely answer that question without really being there when it happens. I can tell you from experience in the past that i have resleeved a cracked nikasil KX250 bore with a cast iron liner and that i had no problems with…"
chris foster replied to jamie ruddle's discussion rm250 kart engine"i'd put the barrel in the same rubish bin i'm putting my barrel with a cast liner in , after it sized at street races also."
jamie ruddle replied to jamie ruddle's discussion rm250 kart engine"hi , no it seized the first time on full throttle at ruapuna , but thats when it had a split boot between the carb and barrel , then i got it fixed ( and replaced the boot) then it seized at about half throttle , then i got it fixed again , then it…"
James Jackson replied to jamie ruddle's discussion rm250 kart engine"Hi
is it seizeing at low throttle % you could be leaning out on the low. And 95 ocy on a 250, is it stock?"
Ross Tait replied to jamie ruddle's discussion rm250 kart engine"yeah I would use more oil for the cast bore ! yamaha kt cast bore is around 16/18 ratio and that is a smaller piston. So not sure on the bigger size ! Also some bores are not perfectly round and are tapered and that can cause issues. I would try…"
jamie ruddle replied to jamie ruddle's discussion rm250 kart engine"yes that was the ratio i used with the nickel bore before it seized and the i also ran that fuel oil ratio in the cast bore . it wasnt a real bad seize this time , so the ring will free upo and piston and bore would clean up to get it running again…"
Ross Tait replied to jamie ruddle's discussion rm250 kart engine"Fuel / oil ratio was that for a Nickel bore ? Cast needs more oil than Nickel ! . But piston clearance could be a question and also the type of piston as some expand more than others .From the full seize Av would not help I would think say !!"
jamie ruddle replied to jamie ruddle's discussion rm250 kart engine"hi , yes ran in both times , i sent the new piston away both time with the barrel , the sleeve was fitted by boss engineering up north first and then cleaned up by nigel sheppard the second time . i was running shell 95 octane and elf fully…"
Ross Tait replied to jamie ruddle's discussion rm250 kart engine"Did you run it in both times ?? Also oil fuel / ratio is differant between Nickel and cast bores. Also some oils cause issues with some fuels (do not stay mixed and do not mix properly !) Was the clearance measured correctly and with the right gear…"
jamie ruddle posted a discussionrm250 kart engine
hi all , i have an rm250 engine on my kart , and it keeps seizing , i just had it fully rebuilt and i ran it in , then it only done a warm up lap and then one fast lap , then nipped up in the bore again . it seized at ruapuna in january and tore the nickel out of the bore , i had it sent away and they replaced the sleevewith a cast one . i put a 67mm piston in it and it seized not long after . do these cast bores expand alot more (when hot) than the nickel bores ? the exhaust temp only got to…See More
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- i am a member of the westland kart club in greymouth and a race a 250 gearbox kart
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