K7svy Posted August 5 Share Posted August 5 Hello. I recently brought a gsx 750 f 1998 I decided to swap the engine/carbs into my b6 bandit The engine ran good when it was in the gsx frame didn’t idle high. but I’m now having an issue with the idle sitting way to high. engine runs fine pulls nice it’s just high idle at 3k things I’ve checked Used carb cleaner to see if there is any air leaks I cannot find any checked throttle cables got plenty of slack idle screw is all the way out checked choke mechanism Anyone have a idea what else to look for? Quote Link to comment
DAZ Posted August 5 Share Posted August 5 (edited) Hello and welcome Have you checked the actual throttle linkage (not just the cable) has not got knocked and that the butterflies and slides are closing properly, it's possible that something is askew after being removed and refitted especially if they were being a bit stubborn or the rubbers were stiff and a bit of brute force was required.... Edited August 5 by DAZ Addition Quote Link to comment
K7svy Posted August 5 Author Share Posted August 5 1 hour ago, DAZ said: Hello and welcome Have you checked the actual throttle linkage (not just the cable) has not got knocked and that the butterflies and slides are closing properly, it's possible that something is askew after being removed and refitted especially if they were being a bit stubborn or the rubbers were stiff and a bit of brute force was required.... I’m planning on stripping it down later on I shall check this while I’m there! Cheers Quote Link to comment
wraith Posted August 5 Share Posted August 5 Welcome to OSS With engine off (not running) open the throttle and then let if go, you should hear the carbs/throttle snap shut. If you don't the carbs are not shutting fully. Quote Link to comment
Dezza Posted August 5 Share Posted August 5 Has the throttle cable adjuster got a locknut under the cable mount? If so and it's not been done up properly, the nut can drop down the cable and prevent the throttle shutting fully causing the symptoms you describe. 3 Quote Link to comment
K7svy Posted August 6 Author Share Posted August 6 So I have sorted this now. The person who said he would change the float bowl gaskets decided to mess with the butterfly valve screws… ( he’s not touching my bike again) cheers all for the suggestions Quote Link to comment
Dezza Posted August 6 Share Posted August 6 7 hours ago, K7svy said: So I have sorted this now. The person who said he would change the float bowl gaskets decided to mess with the butterfly valve screws… ( he’s not touching my bike again) cheers all for the suggestions Elaborate: how did faffing with the butterfly screws (which are very difficult to remove) affect the idle speed? Quote Link to comment
Dezza Posted August 6 Share Posted August 6 (edited) Edited August 6 by Dezza Posted in worng thread: doh! Quote Link to comment
K7svy Posted August 6 Author Share Posted August 6 Sorry I should have. Wrote this better. My bad it was late so as I was looking at the carbs the 2 of the butterfly valves was slightly open the other too was closed I ended up adjusting the valves so they all matched up. I’ve attached a picture of the screws I adjusted I believe the screws are for carb balancing? 2 Quote Link to comment
Dezza Posted August 6 Share Posted August 6 OK, I understand now. I thought before you meant the two screws that hold each butterfly valve to the rotating shaft not the balance screws. If the carb bank had been split then yes these could have come out of adjustment and held one or more butterfly open. When the carbs are off you could do a bench balance before refitting, making sure each butterfly is open an equal amount in synch. This is done using a bit of thin wire and adjusting the balance screws and idle adjuster. 1 Quote Link to comment
K7svy Posted August 8 Author Share Posted August 8 On 8/6/2024 at 4:19 PM, Dezza said: OK, I understand now. I thought before you meant the two screws that hold each butterfly valve to the rotating shaft not the balance screws. If the carb bank had been split then yes these could have come out of adjustment and held one or more butterfly open. When the carbs are off you could do a bench balance before refitting, making sure each butterfly is open an equal amount in synch. This is done using a bit of thin wire and adjusting the balance screws and idle adjuster. Yeah I done it by eye then later on done it with a carb sync tool and it was spot on the bike runs absolutely beautiful now. The swap was definitely worth it made the blandit less bland 1 Quote Link to comment
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