Huw, George's (I believe) problem sounds identical to my situation. What do you mean when you say "static mixture?" Ihave checked for vacumn leaks and found none yet, so how would I go about "tweaking the mixture?" TIA, Gil Bourcier Columbia, MD USA 87 4kcsq - 82k mi 97 Honda Valkyrie Tourer - The Mean Green Machine - 20k mi