1999 Gsxr-750 Srad - Sportbike Forum: Sportbike Motorcycle Forums
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post #1 of 21 (permalink) Old 12-04-2006, 09:49 AM Thread Starter
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1999 Gsxr-750 Srad

Hello All,

I have a 99 GSXR SRAD that has a flat spot or no response when leaving a still position or going up a hill. When I go to take off from a red light,the bike does this bucking motion like it's getting gas then all of a sudden not. Reminds you of a stop-go, stop-go, stop-go type of thing. I have to ride the clutch and play with the throttle to get the rpms up enough to shift to 2nd. It's really bad if I'm parked at the bottom of a hill and have to start up it. It' acks like it not getting gas at all. I can at times roll on the throttle all the way and no response other than stop-go, stop-go, stop-go.

I've changed the spark plugs, had the carbs cleaned, and replaced my air filter. None helped!! PLEEEEEEEEEEEASSS HELP ME!!!!!

SupaCoop
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post #2 of 21 (permalink) Old 12-04-2006, 10:01 AM
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Have you looked at the spark plug leads?????

Couple summers ago I had a local shop install some Dyna Coils.
The Moron didn't use dialectic grease and water got in and shorted out one cylinder, but it would idol ok. A lot of swaring and throwing of tools that year....

Also look at the fuel petcock. Pull a line and see if there is gass flowing. Should be lots of gass comming out of the line. Be sure to take caution...NO SMOKING around the BIKE....

SO DO YOU FEEL LUCKY?
WELL DO YOU?

Last edited by katanajohn 1197; 12-04-2006 at 10:06 AM.
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post #3 of 21 (permalink) Old 12-04-2006, 10:44 AM Thread Starter
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John,

IT'S INTERESTING YOU SAID THAT!!!! The bike idles fine just like yours did, but when I go to take off, man it's like being on a wild bull. I bet it's the ignitian coil pack!!! The one for number 1 and 4 carburetor. What do you think? Is it on the right side if you're sitting on the bike?

SupaCoop
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post #4 of 21 (permalink) Old 12-04-2006, 12:45 PM
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1-4 is left side i think...Just lift the tank and have a peek.

Mine would idol ok, but start to miss at about 1500 rpm's on up..

I have heard of coils going but never had one fail.
Shouldn't be much trouble for a shop to check it out....

Ok try this,,,start the bike and let it warm up.Take a wet rag and press it against each pipe. Should hear a HISS like spitting on a hot iron. The pipe that doesn't hiss as much is the ONE.

But my bike isn't water cooled so this might not be so easy for you..

SO DO YOU FEEL LUCKY?
WELL DO YOU?

Last edited by katanajohn 1197; 12-04-2006 at 01:07 PM.
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post #5 of 21 (permalink) Old 12-05-2006, 11:30 AM
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One more thing....If yours has a fuel tank vent, check to make sure it isn't stuck..If it is it will starve the engine of fuel....
Let me know what you find....

SO DO YOU FEEL LUCKY?
WELL DO YOU?
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post #6 of 21 (permalink) Old 12-05-2006, 11:46 AM
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Sounds like either spark or fuel delivery problems. I would check the coil packs and plug leads, and make sure the fuel lines aren't fouled and the filter is good. Your bike does have a fuel tank vent (98-99 750s do) it could be stuck like John says.

Good luck, keep us posted.



Pete

98 600/750 Gix
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post #7 of 21 (permalink) Old 12-05-2006, 01:08 PM Thread Starter
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Still working on it!

Hey guys,

I broke the bike down last night and I didn't see anything unusual. I checked the spark plugs, the spark plug leads, and looked for any fraid wires and everything seemed ok. I didn't check the fuel tank vent as mentioned though. How do I go about doing so???

Also, how do you troubleshoo the coil pack to make sure it is good???

SupaCoop
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post #8 of 21 (permalink) Old 12-06-2006, 08:18 AM
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On mine the vent is screwed into the top of the tank,with a vent tube[rubber hose] running up and then down through the top of the stering head bolt.
It's just a spring loaded check ball.
I put a few drops of oil in it to keep it working.
Just blow into the end of the hose. you should hear it in the tank with the cap open.

If you have a good spark on all cylinders I don't think it's the coils.
Not sure how to check coils. A shop could probably do it.
Some thing to do with voltage output.

So now I'm thinking CDI. And if thats the case it would be cheaper and a better investment to go aftermarket.

Another issue I had with my 89 was CARBS....
I had, at different times O-ring failure, Diaframs that would fold up, Springs that would brake in half.
All these thing made the bike run like crap.


Hope this helps....

SO DO YOU FEEL LUCKY?
WELL DO YOU?

Last edited by katanajohn 1197; 12-06-2006 at 08:36 AM.
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post #9 of 21 (permalink) Old 12-06-2006, 10:07 AM
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Jet Kit installed?

That sounds like a jetting issue to me.
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post #10 of 21 (permalink) Old 12-06-2006, 12:18 PM
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Does it have a full exhaust system that has replace the original? Some around those yrs were basically for higher revs. Friend of mine had a similar problem, till pipe makers pointed out it was engineered for racing. The jet kit helped a lot, but final answer was to change to an almost stock exhaust system though deeper sounding note from the can.

Remember all the others on the road are crazy & out to kill you.
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