It's confirmed I'm a Fox-aholic

[Norm]

Yes cleaned everything including main jets, low speed jets, mid range, enrichener circuits, but to be honest did not weigh the floats or remove the float needle. I also removed the diaphrams and inspected. As you said they were keyed and easy to put back in the same order. i am excited to see the results I will install tomorrow, balance and let you know if there is an improvement.

[Slyfox]

all you need to do with the floats is look at them when you remove the bowl. if you are careful you can SEE how the float works, if it sinks, it's bad. that's how I found a bad one a few years ago on my ul motor.

[Norm]

all you need to do with the floats is look at them when you remove the bowl. if you are careful you can SEE how the float works, if it sinks, it's bad. that's how I found a bad one a few years ago on my ul motor.

They were good when I removed the bowls with the fuel in them. I did not want to remove the float needle as I have done that before and was never sure I did not bend the level out of spec. I will try this first.

[Norm]

I put an hour on the Fox today after cleaning the carbs and I am happy to report it is much better. Not perfect as there is a high frequency buzz type of vibration but it is much better. I will continue to work on it and see if I can get it perfect.
Norm

[Av8r3400]

Excellent, Norm!!

[68niou1]

Norm-

I just went through the same thing as you- it's amazing how weird these Rotax's will run with iffy carbs. The worst part about it is there is nothing that exotic about the darn things, but if they are not just right it will give you all sorts of grief. One major thing to check that no one ever thinks about(including me until recently) is the slides. With age those things get sticky and wear, and they will cause all sorts of weirdness(rough running, vibration, even complete engine stop) so check the slides and the inside of the carb- if you see any wear or marks that is bad. Also push the slides up and make sure the return is smooth- on mine they would stick one out of 10 times so it's not very obvious. FWIW

Scott