redd Posted June 16, 2008 Share Posted June 16, 2008 Bike started chucking out smoke on tickover . quite a bit really. and only on one pot. Plug looks good though and colour indicates good running engine, so whats the problem. Anyone know. Is it the rings on the piston. valve oil stem seal... ive got a spare cylinder head in case its the seals. But will have to order some rings if this is the problem... Any help be good... cheers... Link to comment Share on other sites More sharing options...
Moderator drewpy Posted June 16, 2008 Moderator Share Posted June 16, 2008 Bike started chucking out smoke on tickover . quite a bit really. and only on one pot. Plug looks good though and colour indicates good running engine, so whats the problem. Anyone know. Is it the rings on the piston. valve oil stem seal... ive got a spare cylinder head in case its the seals. But will have to order some rings if this is the problem... Any help be good... cheers... blue smoke or black? Link to comment Share on other sites More sharing options...
redd Posted June 17, 2008 Author Share Posted June 17, 2008 yea its blue, you can smell the oil and i rekon every car following me, cheers Link to comment Share on other sites More sharing options...
Moderator drewpy Posted June 17, 2008 Moderator Share Posted June 17, 2008 yea its blue, you can smell the oil and i rekon every car following me, cheers has the bike been standing for long? as the piston rings can stick and cause smokin' if its smoky on startup and goes/lessens when warm i suspect valve guides. if its really smoky all the time especially when you shut off the throttle and bang it back on then its the rings. check the breather pipe if there is any blow from the gear box Link to comment Share on other sites More sharing options...
redd Posted June 17, 2008 Author Share Posted June 17, 2008 think the bike had stood a while. so its possible the rings mite be stuck. or its scored the barrel and worn the rings out. suppose be best to strip and investigate. is it easy enough to get the gasket and rings? you wouldnt no the prices of this gear... cheers 4 advice... Link to comment Share on other sites More sharing options...
Moderator drewpy Posted June 17, 2008 Moderator Share Posted June 17, 2008 think the bike had stood a while. so its possible the rings mite be stuck. or its scored the barrel and worn the rings out. suppose be best to strip and investigate. is it easy enough to get the gasket and rings? you wouldnt no the prices of this gear... cheers 4 advice... should be ok, the rings should free off (ungum) by using the bike regulary. still get gasket kits from yam (motoward/motogrid/granby's etc) I think you can still get rings, but I got mine from ebay cheap. check fro overbore sizes before ring purchase!! Link to comment Share on other sites More sharing options...
redd Posted June 18, 2008 Author Share Posted June 18, 2008 nice 1. checked pistons. I have spare top end. But will need honed and rings to... They are stamped inside yamaha / Art / 2 / Also they measure 54mm... Will this be standard size... Link to comment Share on other sites More sharing options...
Moderator drewpy Posted June 18, 2008 Moderator Share Posted June 18, 2008 nice 1. checked pistons. I have spare top end. But will need honed and rings to... They are stamped inside yamaha / Art / 2 / Also they measure 54mm... Will this be standard size... erm.. 55mm is a 250cc piston!!! 69mm is a 400 what is your engine number? Link to comment Share on other sites More sharing options...
redd Posted June 19, 2008 Author Share Posted June 19, 2008 that be a strange one. suppose its possible the spare engines the 250 *4G6-005405 cheers Link to comment Share on other sites More sharing options...
Moderator drewpy Posted June 19, 2008 Moderator Share Posted June 19, 2008 that be a strange one. suppose its possible the spare engines the 250 *4G6-005405 cheers that's a 250 engine Link to comment Share on other sites More sharing options...
redd Posted June 20, 2008 Author Share Posted June 20, 2008 nice 1... that was lucky. would have posted on here askin why me bikes lost power . 150cc to be exact i will see what the origionals like n take from there. or if anyone has spare barrels n pistons for sale ( 07779910366 ) gi me a text and i will call back... cheers... ta for help drewpy... Link to comment Share on other sites More sharing options...
Moderator drewpy Posted June 20, 2008 Moderator Share Posted June 20, 2008 nice 1... that was lucky. would have posted on here askin why me bikes lost power . 150cc to be exact i will see what the origionals like n take from there. or if anyone has spare barrels n pistons for sale ( 07779910366 ) gi me a text and i will call back... cheers... ta for help drewpy... try here http://www.yamahaspares.uk.com/XS250.html know it says 250 but there is a new 400 barrel there!! Link to comment Share on other sites More sharing options...
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