ZXR250 - hesitation and stalls when warm

[Ultrasonic2]

just tried 0.1 shims but that makes the rest to rich. maybe the ultimate issue is to rich i dont know.

i give up

[Ultrasonic2]

im going to take a different approach and replace the float needles and seats and call it a day

[ducatilover]

When you are replacing the caps over the diaphragms, put a spanner under the slide to hold it up further than its normal position, this will make sure you've got them sealed correctly. Have had the same problem.

Did you do the tuning step by step as I wrote it out?

[Ultrasonic2]

no i didn't. have done that kind of thing in the past. I dont believe that is the issue

it's going to be a float needle / float height issue.

The problem last time when i changed the float height is that then made the bike to rich changing the float height may or may not have fixed the issue but now it was to rich. I probably changed the float height to much.

I really want to increase the float height ( lower the measurement) but i think i'll need to lower the needles but that is not possible as they aren't adjustable.

simply replacing the float needles may make the problem disappear

[ducatilover]

Float needles may help, I'd rebuild the carbs just because it's not very expensive and worth it.

[Ultrasonic2]

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Float needles may help, I'd rebuild the carbs just because it's not very expensive and worth it.

yeah ..

i forgot to say that i lowered the float level and it made the problem worse. SO it is a float issue .

will have to wait till next month before i can aforred a rebuild kit

[ducatilover]

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yeah ..

i forgot to say that i lowered the float level and it made the problem worse. SO it is a float issue .

Or the float is a contributing factor.
They shouldn't be if they're all the same, only lower them in small increments.

[Ultrasonic2]

im seriously considering adding a fuel pump from the 400. it all costs money but i think it would be worth while to have the same fuel pressure irellevant of how much fuel is in the tank and would most probably solve the problem in a different way.

i will have to look into it but is can't be to hard to add a pump and a relay

[ducatilover]

You'll have the same pressure regardless, gravity is constant. (In my mind)

[Ultrasonic2]

a fuel pump off a 400 apply about 2 psi. it doesn't really matter i've ordered new float seats and valves which im hoping will actually solve my problem. i will have to wait and see

[ducatilover]

Good luck bro

[Ultrasonic2]

Right so i got the cdi working now :-)

I have now replace the float needles and seats and am playing with float heights again. i think im close to having something close enough to right.

While changing the float needle and seats seems to have reduced the problem it still remains. the float height is at 14mm and i how i found the bike. the manual says it should be 13mm, which i have tried and 12mm but doing so only makes the problem worse. changing the float height is the only way i can think of leaning the bike out