fmf fatty jetting question

[gooberff]

I am starting to attempt to rejet my bike after installing fmf fattys and turbincore II silencers. I have a pro design pro flow foam air filter with the lid on and snorkel removed. no other mods to bike.

 

I have read and printed all the carb and jetting info on this site and it has helped me formulate my plan of attack. I have also done a search and found a couple of posted topics that have helped.

 

I am planning on starting with 260 mains and the stock pilot and going from there.

 

Any input will be greatly appreciated.

 

I have seen the plug chop diagnosis. can this be accomplished with the bike secured to a stand with the rear wheels in the air and running through the gears?

 

will no load on the bike cause a bad reading?

 

Great site with loads of info!

 

oops looking for suggestions not subbestions

Edited December 30, 2006 by gooberff

[slowpokebanshee]

sounds like you are on the right track, put 260's in it and ride the wheels off it.....I had a similar setup as yours years ago, w/no air box and fattys at sea-level, I had 280's and plug read was fat....hope this helps

[chevy7398]

if you go to fmfs website and look at there jetting chart it says to run 260s also i have fattys with powercore 2s and been runnin 260s stock pilots, just rebuilt my top end after 7 years of hard ridding and it was still runnin like a rapped ape

'

[thack]

im at 1000 feet and im running 280s mostly stock except filter and pipe and coil. seems to run great but it wants to bogg a little when i take off in second gear .i might try 270s and see what happens.

[sheefreak]

You will not get a good plug reading without a load. You might start a hair richer if it is cold where you are at, but you are real close. I wouldn't go much more than a turn out on the airscrew. Fatty's mine ran better w/27.5 pilots, but that was w/the lid off. If you end up running w/the lid off eventually, I would move the clip a notch down on the needle as well.