RM500 jetting

[tmkiwi]

Need a little advice.
Recently purchased a RM500D. First run was last weekend. Bike is a low hour one, all stock.
Currently running
280 main
35 idle
6FM46 needle. Top clip
Changed out the 45 idle jet for a 35 as it was running very rich down low. Still running too rich down low.
Once in the band it pulls well but the transition is a poor.
So my questions are.
Has anyone tried a 30 idle jet.?
Have just fitted a GMC exhaust system. Will this make it leaner.?
Haven't run it with the new exhaust yet.
I don't think the carb is worn as it's such a low hour bike. But I could be wrong.
What do you think.

[SON]

First person I would talk to is GMC
It won't be the first RM500 pipe he has made and he will probably have had some feedback from previous clients
Don't forget the basics only change one thing at a time so you can measure the differences

[JohnnyO]

Possibly needs a smaller needle jet if the needle is already on the leanest setting.
35 pilot should be close

[80-85 husky]

poor transition usually means rich on the needle. get the next one down (whatever that is.. )

[Lozza]

I would agree with needle jet/needle.If your needle is that far down, you need to change the needle and or the needle jet.

[shelpi]

Get the Sudco, Mikuni 5th Edition Tuning manual, only costs Around $14, its the bible, its all in there, tuneing, specifications, trouble shooting, parts catalogue,
so when ya order ya bits and or Carbies say from Ian Willians Tuneing you will have all the same part numbers for your RS, VM, HSR, TM, TMX, HS and BN carburetors

[D project]

I went two sizes leaner on the needle jet and one size down on the slide.
I think you should be ok around the 35/40 on the pilot.
These are what I am using with the standard pipe with all the other carb parts you have.

[tmkiwi]

I went two sizes leaner on the needle jet and one size down on the slide.

Do you remember what the needle was.?

[D project]

Stock needle.