LJWalter Posted July 26, 2013 Report Share Posted July 26, 2013 Help me OR!Heres what i got; 99 Suzuki GSF600 Bandit with 15k. It would idle ok, but when you hit the throttle, it dies out.. I pulled the carbs & found that 2 of the diaphragms were torn. Went ahead & replace all 4 to be safe. Carbs back on & still the same issue... Any help would be much appreciated! Cheers! Quote Link to comment Share on other sites More sharing options...
zx3vfr Posted July 26, 2013 Report Share Posted July 26, 2013 Sounds like pilot jet or vacuum leak Quote Link to comment Share on other sites More sharing options...
MidgetTodd Posted July 26, 2013 Report Share Posted July 26, 2013 Clean the Jets Quote Link to comment Share on other sites More sharing options...
grapesmuggler27 Posted July 26, 2013 Report Share Posted July 26, 2013 You got your answer so I'm just going to tell ya to check your gigawatts Quote Link to comment Share on other sites More sharing options...
just_some_dude Posted July 26, 2013 Report Share Posted July 26, 2013 Carb boot possibly? Choose what you want, but you could spray a little wd40 around the carb boot and if the idle changes you likely have a bad carb boot. Or carb boot loose? Also, tighten too much and it could damage it as well. Quote Link to comment Share on other sites More sharing options...
ReconRat Posted July 26, 2013 Report Share Posted July 26, 2013 (edited) vacuum leak problems mostly go away when revved up. Sooo, fuel flow or spark. Roughly, if the plugs are dry, it's lacking fuel.If the plugs are wet, it's lacking spark. edit: I hate carbs with diaphrams. They are always breaking. But they are smooth. Edited July 26, 2013 by ReconRat Quote Link to comment Share on other sites More sharing options...
Gixxus Christ! Posted July 27, 2013 Report Share Posted July 27, 2013 Check fuel lines, also-and this is critical- there's a little o-ring there when you take off the diaphragm cover. Its very small and easy to lose but extremely vital to the diaphragms working properly. Is the bike set up stock? Has someone given it the bro treatment (piped, jetted and pod filtered it)? Vacuum pet cock functioning correctly (if applicable)? Is the TPS hooked back up on the #4 carb? (if applicable) Quote Link to comment Share on other sites More sharing options...
LJWalter Posted July 27, 2013 Author Report Share Posted July 27, 2013 Check fuel lines, also-and this is critical- there's a little o-ring there when you take off the diaphragm cover. Its very small and easy to lose but extremely vital to the diaphragms working properly. Is the bike set up stock? Has someone given it the bro treatment (piped, jetted and pod filtered it)? Vacuum pet cock functioning correctly (if applicable)? Is the TPS hooked back up on the #4 carb? (if applicable)Yes, it is piped & jetted. vacuum on petcock is working. Diaphragm in petcock it tact as well. I did not notice an o-ring tho..... Got anymore details on that?Thanks a mil!!!! Quote Link to comment Share on other sites More sharing options...
ReconRat Posted July 27, 2013 Report Share Posted July 27, 2013 (edited) good point, that's one vacuum leak that will shut off fuel. The o-ring seal on the lid at the carb diaphragm.I suppose we can count the vacuum operated fuel shut off petcock also. Exceptions to every rule. edit: I think some carb diaphragms have the seal built in, and no o-ring. but I've seen some leak where I've had to seal them with something. Cheap trick is grease them where they need to seal. Might swell up and break again, but if they live through fuel and alcohol, I don't figure grease is going to hurt them. I'd have to know what type of polymer/rubber they were made out of to know for sure. Edited July 27, 2013 by ReconRat Quote Link to comment Share on other sites More sharing options...
Gixxus Christ! Posted July 28, 2013 Report Share Posted July 28, 2013 If you have the same carbs that I have on my 03 bandit 1200 then after you remove the top of the carb there is a little port outside the outline of the diaphragm. On mine if the motor side of the carb is noon and the filter side is six, they are at about 1:30. The only thing that holds the little o ring in is the lid and sometimes they will stick to the lid and then fall off later. Losing those o rings will shut a bike down. It could also be that you need a carb clean. Are the bowls filling up? Crack the drain screws and see if gas is for sure making it down to each carb, possible you have a flow issue. Quote Link to comment Share on other sites More sharing options...
LJWalter Posted July 28, 2013 Author Report Share Posted July 28, 2013 Thanks everyone for chiming in. After some research there are no o-rings for the diaphragm covers. I am leaning more towards fuel flow. Like i said, when the bike is cold (carb bowls full) it revs just fine. I believe after it burns through what is in the bowl, it does not replenish fast enough. All fuel lines are clean. Is there a way to test the petcock other than replacing it? Thanks again!! Quote Link to comment Share on other sites More sharing options...
Gixxus Christ! Posted July 28, 2013 Report Share Posted July 28, 2013 Sure, get the bike running and pull the fuel hose off the petcock. If gas comes out, its working. Will it rev on choke? You really need to go get some clear plastic hose, hook it to the bowl drains and bend it up against the carb, that will act as a sight glass for your bowl levels. If you think it might be the petcock, put it on prime, that lets fuel flow whether the motor is running or not. Its also quite possible that you just need a carb clean. Where in Ohio are you? Quote Link to comment Share on other sites More sharing options...
LJWalter Posted July 29, 2013 Author Report Share Posted July 29, 2013 Sure, get the bike running and pull the fuel hose off the petcock. If gas comes out, its working. Will it rev on choke? You really need to go get some clear plastic hose, hook it to the bowl drains and bend it up against the carb, that will act as a sight glass for your bowl levels. If you think it might be the petcock, put it on prime, that lets fuel flow whether the motor is running or not. Its also quite possible that you just need a carb clean. Where in Ohio are you?The carbs are clean as they can be. Jets are clear, etc. I am in Hilliard, nw suburb of Columbus. Sucks because Hoblick was about a mile from me b4 he moved... lolI will try it on prime. Thanks again for all the help! Quote Link to comment Share on other sites More sharing options...
just_some_dude Posted August 1, 2013 Report Share Posted August 1, 2013 Did you ever check the carb boot? Quote Link to comment Share on other sites More sharing options...
LJWalter Posted August 2, 2013 Author Report Share Posted August 2, 2013 Yea, boots are solid. Quote Link to comment Share on other sites More sharing options...
Gixxus Christ! Posted August 2, 2013 Report Share Posted August 2, 2013 Still can't find the issue? Quote Link to comment Share on other sites More sharing options...
LJWalter Posted August 5, 2013 Author Report Share Posted August 5, 2013 Still can't find the issue?I've been working a ton the last week & have not revisited it yet. No changes... Quote Link to comment Share on other sites More sharing options...
Gixxus Christ! Posted August 5, 2013 Report Share Posted August 5, 2013 Sure you got the carbs in facing the right direction? Quote Link to comment Share on other sites More sharing options...
just_some_dude Posted August 5, 2013 Report Share Posted August 5, 2013 Does this only happen when the bike is in gear, or in neutral? Is there a kickstand safety switch on this bike, or any other safety switches for neutral, etc.? Quote Link to comment Share on other sites More sharing options...
John Posted August 6, 2013 Report Share Posted August 6, 2013 are you 100% sure the jets are clean? not only the jets, but all the passages too. did you remove the pilots and could you see light through them? Quote Link to comment Share on other sites More sharing options...
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