What started as a supposedly simple carb cleaning issue has become a saga About 6 weeks ago my bike began lagging on acceleration and would surge when the throttle was opened. So I pulled out the carbs, gave it them a good clean as they were quite filthy with what appeared to be a red/brown gunk. This did not fix the issue, so as I was in a very busy period had it picked up by Peter Stevens in Geelong. They had it for over 3 weeks, charged me almost $1000 and didn't fix the issue In this time they also checked and adjusted the valve clearances. They claimed that it needed a new fuel pump and would cost a further $500-600 to fit one. So I got one and fit it myself. This did not fix the issue. So I took it to Road and River in Geelong, who charged me over $300 and said it was fixed, that it only required a carb balance and the mixture screws set back to factory (which I had already done), they also adjusted the float levels. They also said the ignition coils were not testing properly. So I replaced those as well. So the Yammy is still lagging/bogging under engine load, backfiring, surging and cutting out if I don't take off carefully. My next best bet was an old mechanic who still works on Japanese bikes in Geelong, but he had a heart attack yesterday (which is a fair reason to take some time off). So now I'm well and truly neck deep in the proverbial creek. I don't know how to proceed. Has anyone had similar issues?