Serafumi Posted July 8, 2022 Share Posted July 8, 2022 On 6/24/2022 at 9:26 AM, Captain Chaos said: I'm having the same problem now with my B12 engine and carbs. Roll off the throttle, revs drop slowly. Snap it shut, all ok. With warm engine only. Had been OK for years but a few weeks ago this problem appeared. Tried new spark plugs, a new throttle cable, no difference. Tried without throttle cable, no difference. Ultrasonic cleaned the carbs and reassembled carefully, no difference. Now going to adjust the valve clearances (weather permitting, it's too nice to work on the bike, better go for a ride on one of the other bikes ) and see what difference it makes. Inlet runner orings would be my first point of call . Spay brake cleaner between the rubbers and head while on tick over to see if revs rise . If do you need new o rings Quote Link to comment
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