Question about 1972 Honda CB 250

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125 twin recent rebore 1000 miles ago one exhaust

Honda cb 125 tb recent rebore & new valves & valve seals1000 miles ago one exhaust smoking & oiling but plug is in a1 condition bike starts first kick can u help regards ,goosie

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Its a little hard to tell without seeing the exhaust color.Black is oil.brown is fuel.If the bad cyl. still has a good plug it may not be oil.Check the smoky exhaust carby.It may be you do not have complete firing on the bad cyl.MAYBE.Does the bike run well once you get the revs up under load?Check for inlet leaks that may change the fuel mixture on the suss. cyl.There is a few more things but start at these things 1st.After a complete rebuild,these problems do start.I hope this helps

Posted on Aug 23, 2009

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