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97 gsx runs rough

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viper0173

viper0173

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hello,
i have a 97 gsx that is runnign rough from idle to about half throttle. hit the thottle and runs perfect. no bogging or hesitation that i can detect. ive tried all the tests such as running 1/4 throttle for a minute and then pegging it. that is perfect. same with half throttle for a min then peggin it. perfect again. and from a dead stop pops right up .
i dont know where to go from here. carbs half been rebuilt, and syncd.
any help would be great as this is the only issue i have left to fix with this machine.

thanks
 
I'll get the ball rolling with; have you changed your grey tempo fuel lines and cleaned out all three fuel filters (that includes the filter in each carb), does it run better when you turn your fuel selector to reserve, and have you checked the condition of your rave valves (cylinders and on the water box)?

Hope that gives you some starting points.
 
yes i have done all of that . raves seem to be in good shape, i cleaned them and put in new gaskets, the water regulator had come apart but i fixed that and it still does it.. im pretty sure its not the carbs as it did it before i rebuillt them and i also swapped out the carbs on my 96 and no difference when i did that. maybe an intake leak? rotary valve timing off?
 
ok i just found a hole in the rubber exhaust hose connecting the stinger to waterbox. would that cause the problem i am having?
 
hmmmmm..i dont think so....do this ....idle around for about 10 min ..just idling....then peg the htrottle and see what it does..but by all means fix the hole ..it sounds tome like you are rich on the low speed needles...how rough does it run...whats it do
 
i did that and the response is fine no loading or hesitation that i can tell. it sounds like it is burbiling (for lack of better terms) which would indicate rich, but i sit at idle and nail it and it goes like a raped ape. and it does this all the way to half throttle if u give it gas slowly. im stumped. would an intake leak between carb and manifold cause it to do this. iv closed the low speed needles to 3/4 open can i go more with those? im kinda leary

thanks for the quick response
 
no i wouldnt go any more than that.....stock is 1 turn out from all the way in.... I guess that BURBBLING is hard to pinpoint do you have any way to take a video and post it then we could fix it right away
 
i can try to post a vid may be kinda hard to do in water. the stinger is the pipe before the water box. i can almost put my finger threw it. its not affecting the performance that i can tell but its quite annoying considering my 96 is as smooth as butter.. i know my compression is low and seems to be 10 psi diff beween the two. again my 96 has lower compression(although not that much of a psi diff) and its smooth
 
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if you have that big of a hole then yes that could cause some issues...how is water not getting in your hull???
 
so the little 4" piece of rubber that connects the muffler to the waterbox? Yes if this is blown it could be a definite problem. What is your compression by the way, this could be a problem as well
 
yes that piece of rubber. and if i remember right mag at 120 pto 110. but again my 96 is 108 105. yes i know this is very low. and im sure its not helping
 
what are your RPM numbers when Idle in and out of water... Also what is the WOT Idle you are getting?
 
You need to replace that hose immediately. Also need to make sure the water regulator is working correctly and pumping water thru the muffler. Take the hose to the auto store and let them match it
 
already got the hose on order. i will check regulator. i can do that on trailer right? as long as hose hooked up
 
your regulator is fine....it wouldnt be running 6800 and jumping right up to there if the reg was bad so dont worry about that.....replace the hose and it might clear up but we are just going at this blind...noone really can decifer anything when all we know is it is BURBBLING......we need more of a detailed description or a video would be the best...does it do the burrbbling on the trailer too or just in the water

EDIT----- i thought u meant the voltage regulator not the water regulator..YES check the water regulator but i doubt that is your issue...if it was that hose would be melted not just a small hole
 
SORRY ABOUT MY LAME-O DESCRIPTION.YOU CAN SEE THE ROUGH IDLE OUT OF WATER AS WELL THE ENGINE BOUNCES AROUND A LITTLE TOO MUCH, THATS WHY IM THINKIN TIMEING MORE THAN CARBS. AS IT DID THE SAME THING WITH A KNOWN SET OF GOOD CARBS ON IT. Ill try and get some vid this weakend. Any chance rotary valve out if time.the motor was supposedly just rebuilt 20 hours ago.( supposedly!!!) maybe a better description would be more like a low rpm misfire. Sounds like its missing on the low end.

Thanks for all your help guys. I have no doubt we will fix it.
 
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I think i know what you are saying...If you hold the throttle at say 1/4 and keep it there for a while does it almost sound like it will run smooth then all the sudden kinda ping and act like it misses then clear up then do it again and kinda do like a sputter but if you punch it it runs great
 
Ya in a way only you can hold it anywhere from 1/4 to 1/2 and it will do it. And if you nail it its fine . Even fron a dead idle you nail it and its fine but just cruisin at half throttle it misses.
 
ok now i understand...mine does the same thing.... but only from 1/4 to 1/2 when cruising.... i have cleaned my carbs several times replaced the lines..compression is 150 in both and it still does it..i have had others say that theirs does it so i was believing it was just the natur of the beast...lets see what others have to say....DOC YOU OUT THERE
 
Ok if that is true then why doesnt my 96 do it? And mine is from idle right through half throttle. with a noticeable boucing when watching the motor. ( AND YES MY MOTOR MOUNTS ARE SOLID. LOL) I mean it doesnt affect the performance at all its just annoying and honestly i dont think its right. But lets see. I have read in other posts that if thr rotary valve is off it could do this but im still new and still learning. Id like to solve this before the season is over as i live in the north east and it is winding down. Ive got mayb 2 months left if im lucky.
 
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i understand....my 96 xp with the same engine dosent do it......but if the RV was out of time you would be having more issues than just that...a vid would definetly help
 
ok ill get one asap probably i can do a trailer vid tomorrow but i cant get to the water till this weekend. thanks brock. i appreciate it.in the meantime maybe we'll get some feedback on this
 
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