StrayCats GSXR 750 Problem - Only VRF Forum Guys seem to be helpful

Yea, at 14.7 mm its parallel to the carb body. that part im good with.

the issue is how the floats behave with the original needles vs the new K&L needles

-the K&L needles give me a consistent reading of 14.7mm from the 45 degree tilt to fully inverted, ie there is no final drop in float height when you get to fully inverted
-the original needles give me a 2mm lower reading when fully inverted vs at 45 degrees

So either the plungers on the original needles are weak, or something is materially different between the 2 sets of needles.

its possible the "original needles" ware in fact the wrong ones and that left the float heights very very low. I know the carbs had been opened up before, as all the bowls and CV caps had Allen screws in them.

At the end of the day, I gonna have to try it and see what happens I guess.

Also 2 different GSXR forum's i'm on the other one too, here what got posted there.

 

In my experience, you will see it when you get the float adjusted according to the manual. It's uncanny, but I believe there is a reason.

 

Never noticed… thank you NC !


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Mic the float needles, same length?

 

Yea, even tho my manual doesnt show it and the forum guy says pay no attention to the float being parallel to the carb body, mine are parallel at the specified 14.7mm.

I just trying to understand why the floats behave differently with different needles, so I may avoid taking the whole thing apart again.

 

im betting slightly longer on the K&L's, NB

ill Mic them tomorrow, thats partly why I wonder if the "original's" were in fact - wrong

 

It's just one of those things I noticed after looking at and working on a bunch of carbs. I haven't worked on thousands of carbs, but I'm sure it's close to 25-30 sets...and they all did it when set. I still highly recommend following the manual for the height, but you can get a good idea just by popping the float bowl tipping it to the right angle.

 

At that point, which one's are right

 

Why I always try to buy the carb manufacturers jets exclusively.

 

Yea, no kiddin'

lesson learned no more aftermarket carb hardware.

I figure as long as the float height is good, and the plungers still work. I should be OK.

If not, ill be pulling them out ....again

 

If you are close, it won't be an issue. I would hook them up to an aux bottle on the bench and let them sit for a couple days. Hang it high, try to get a couple psi on them, if they don't leak, you should be solid to put them back in.

 

Good Idea, ill do that .

Cheers

 

Took NB's advice and setup the carbs in an old wash basin connected to the external fuel source. will leave her a few days like this. I also put some pieces of blue shop towel in the carb throats. the blue shop towel has some sharpie marker dots on it and if there is only a small trace of fuel leaking it will spread the marker into a purple tie-dye effect, maybe easier to spot than just straight gas on a shop towel .

 

Carb #3 still dripping fuel out the carb throat.

re checked the needle and seat, no air able to pass when I blow down the air line

Float height is good.

Have to start swapping parts between carb 3 & 4 and re test, see if the problem moves with the parts

 

Holy Crap....so much patience. Stay with it Stray!

 

thanks Jim, generally im not a patient man....at all

I gotta thank NB again for the bench test idea, it hadn't occurred to me and it was so obvious. This saved me time installing and removing them again, not only that but its easier to diagnose when you see fuel dripping and you're not guessing about spark, or if its starving or rich etc. So at this point before I go any further its fix this carb leak.

Thanks again NB !

 

much better at locating carb leaks than shop rags is brown cardboard from a box under them.

 

No worries, I know how painful it can get sometimes when you are driven to solve a problem that continually punches you in the nose. It gets so frustrating that you can't see the forest for the trees after awhile.

 

cheers Squirrel, ill try that tomorrow when I test again.

my tie-dye effect on the paper shop towel worked well tho.