Hello to all new to the forum take it easy on me... recently i customise my cb750c dohc to brat syle... i remove the air filter (yes i know good luck to me with the carbs)and i add some high quality pod filters by DNA.. well now i am facing a problem... when i start the bike is idle great BUT when i am opening the throttle the rpm stay high for about 10 second then drop to normal... carbs are clean with ultrasonic... and compress air and carb cleaner... bench synch and the synch using a manometer on the bike.... i add bigger jets on the carb but the problem is still there.(assume that after putting pods they need more fuel) .. i also check for vacuum leaks no luck either...
any ideas please regarding by problem is well appreciate ..
Bike looks good. It sure sounds like a vacuum leak. Pods do not usually effect idle. I use starting fluid to find vacuum leaks. Carb and brake clean do not do the job. I have found vacuum leaks around the fuel/pilot screws. Practically every set of carbs I take apart is missing the little O-rings and washers on them.
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Thank you Tools for your response.. i will go tomorrow and by some starter fluid to check again ... i am pretty sure that I included the small o ring and washer.. i am going to check for vacuum leak again and post the results ..i was working on the bike earlier and decide to start it with out the pod filters and idle was returning back to normal for some weird reason... i am thinking that i am running too rich at the end of the day.... running with pods idle hangs up for seconds when i am turning the throttle ... remove pods indle back to normal when turning the throttle..
next after the starter fluid check i will close the mixture screw back to 1/34 and see if that makes a difference