Hey guys, I just rejetted my rappy with 155/160 mains, and 25 pilot jets....it backfires a little with the lid off and sounds perfect with the lid on..my question is, how should I adjust the fuel/air screws? I left them where they were stock.....also my gyt-r silencer has the spark arrestor in it, just in case it makes a difference....oh yea, when I revved it up..it looks like the screen inside the silencer was pushed out a little, problem? Thanks for you help guys!

 

are you leaving the lid on or leaving it off?

 

I think I'll be leaving it on for the most part..probably just taking it off at Glamis....

 

I would start at 2 1/2 L 2 3/4 R on the mix screws. You may be a tad lean with those mains for running with the lid off.

 

those turns would be from the seated or closed position? Also, when i do a plug check..what should I be looking for? SOrry, guys, this is my first time doing this and I want to get it right..thanks!

 

Yes from the seated pos.
Run it for a while before you check the plug, it should be a tannish brown. But with the additives and detergents in gas now it's not that easy.

 

Just took the rappy for a test-ride...Damn..I can't believe the difference my little mods made....I was hauling some serious ***....Can't wait to get it out to Glamis next month!

 

I am running the 155/160 and 25 pilot jets. 3 turns out. FMF pipe and K&N. 700' elevation. With the lid off, it leaned out and fell on it's face something terrible at 4500 rpm on the Dyno. Blistered a brand new plug. At 3000' with the lid on, it is dead on. Plug reads a pretty tan.