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Help Me Fix It A great place to post any problems you may be having while working on your motorcycle. Most of us are do-it-yourselfers so this is a great way to share any information pertaining to fixing something or adding something on.

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Old 07-21-2007, 02:11 PM   #1 (permalink)
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Angry '97 gsxr 750..carb problems

i have a 97 gsxr750 .. hd carbs cleaned when i bought it a few months ago. the dealer said the diaphrams were stuck.revs fine in nuetral but now it runs like crap below 4000rpm..taking off sucks, you have to feather the clutch or it wants to die. this is really making me hate riding for the time being...talked to several others and they said all gsxrs run bad under 4000rpm..not what i wanted to hear..a change to fuel injection is out of the question due to finances as well as i hear its a huge job..wiring and everything..any help greatly appreciated....i am so pissed i am thinking about selling the bike..thanks again in advance
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Old 07-21-2007, 08:05 PM   #2 (permalink)
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Sounds like the guy who cleaned the carbs needs to do it again properly.
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Old 07-21-2007, 08:10 PM   #3 (permalink)
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sounds like you need them to be properly jetted. i don't think the mechanic did a good job with the reinstall.
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Old 07-21-2007, 10:35 PM   #4 (permalink)
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I got the book on my bike, took the carbs completely apart, cleaned them and replaced some of the parts because they were deteriorating due to it being twenty years old. It will take a couple hours, but you'll learn a lot from doing it, and I found it pretty easy to do with the manual.
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Old 09-03-2007, 09:55 AM   #5 (permalink)
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Default carb problems

Hi, did you ever fix the problem with your bike where it would rev fine in neutral but when starting from a stop it ran like crap? I am having the exact same problem and was wondering if you ever got it fixed. Dont believe anyone who tells you these bikes normaly run this way. Thanks for any info.
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Old 09-03-2007, 03:09 PM   #6 (permalink)
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Quote:
Originally Posted by need4machspeed
Hi, did you ever fix the problem with your bike where it would rev fine in neutral but when starting from a stop it ran like crap? I am having the exact same problem and was wondering if you ever got it fixed. Dont believe anyone who tells you these bikes normaly run this way. Thanks for any info.
You may have to syncronise the carbs.
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Old 09-03-2007, 10:24 PM   #7 (permalink)
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Synchronization of the carbs really only affects idle and off idle throttle response. Once the plates are open, it almost negates the effect of synchronization.
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Old 09-04-2007, 06:27 AM   #8 (permalink)
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Quote:
Originally Posted by Redstar11
Synchronization of the carbs really only affects idle and off idle throttle response. Once the plates are open, it almost negates the effect of synchronization.
Synconization affects the full rpm range but is most noticable at low rpm since one of the cylinders is doing most of the work. Since his problems are mostly off idle with symtoms of poor power, synchronization should be looked at.
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Old 09-04-2007, 10:34 AM   #9 (permalink)
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Quote:
Originally Posted by Veefer97
Synconization affects the full rpm range but is most noticable at low rpm since one of the cylinders is doing most of the work. Since his problems are mostly off idle with symtoms of poor power, synchronization should be looked at.

I disagree, synch'ing carbs opens the throttle plates to a certain degree around 15-25 degrees or so in relation to one another. The adjustments are very minute, unless the throttle plates are somehow extremely mal-adjusted. However, once the plates are open, due to the pitch of the throttle plates, and the change of restriction of airflow past the throttle plates, the effect of synchronization rapidly disappears. It is the same reason there is a much larger difference in throttle response/engine response from 0-1/2 throttle, as there is from 1/2 throttle to WOT.

However, I do agree that since his problems seem to the rooted at RPMS under 4000 RPM, he does need to check his synch, make sure the carbs are completely unrestricted, and verify that all of his vacuum slides are functioning properly.
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Old 09-04-2007, 11:42 AM   #10 (permalink)
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In synchronization the throtle plates are adjusted so that all the cylinders have the same vaccum. This means that each cylinder producess the same amount of power as the rest. The full throtle range is effected by synchronization however one may not notice the symtoms at high rpm because they are masked due to the power that is produced by the strong cylinders that are carying the weak cylinders. This unsynchronized condition leads to a power loss but as I stated it is not noticable in everyday riding at a higher RPM.
As for the difference in in throtle response from 1/2 to WOT there is much more going on than just throtle position such as inertia of the recipricating parts and at which point on the horsepower curve you are located at. Cam and ignition timing as well as cam overlap also are a huge contributer to the spooling up of an engine.
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Old 09-04-2007, 05:58 PM   #11 (permalink)
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sound like you need to rejet the bike again, might want to let someone with alittle more knowledge take a look at them carbs for ya
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Old 09-05-2007, 12:44 PM   #12 (permalink)
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Try hooking up a vacuum gauge up to a set of carbs and hold the bike at 1/4 throttle. See how little difference adjusting the synch screws has on vacuum when the throttle plates are open.
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Old 09-05-2007, 02:49 PM   #13 (permalink)
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I have. It makes a difference in airfow and volume
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Old 09-05-2007, 04:47 PM   #14 (permalink)
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OK, well I have to, on a number of different bikes, a number of different times. We will just have to agree to disagree.

On another note, I used your Honda CCT trick the other day on a customers bike. Works great!
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