Main jets with RKT 13.5 head?

[BIG HEAD]

What is everyone running for main jets with RKT 13.5 head? Stock, head only. And at what elevation?

 

[pistonbroke800]

What is everyone running for main jets with RKT 13.5 head? Stock, head only. And at what elevation?

I would double check with Kelsey but..i just dug up an old set of installation guidelines for his heads. 800R he is calling for a 450 main jet and the needle raised one clip position.

 

[BIG HEAD]

he didn't tell me, just said what his 06 or 07 had in it. 430
Didn't get any info with inserts either.

 

[BIG HEAD]

anyone else running the head?

 

[HiLlClImB911]

Try stock and check your plugs, if they look rich start comming down until you feel safe, i was running 430s in mine last year with his drop in kit

 

[BIG HEAD]

I was trying to get a feel for what everyone else had. Didn't want to wrestle those carbs out 3-4 times. Thanks for your help.

 

[HiLlClImB911]

the 430s which i was running last season were bang on, had scoped the pistons for wash, read plugs and were a nice clean tan, was running 20% c12 with 91, tried the 450s and was rich, i never raised the neddle clip when i was at the 430's, put a new crank in the sled this year with a slp intake kit and went up to 450s to start (being safe) and was rich so i think ill be back at 430's again, hope this helps somewhat as this was with my rktek drop in kit and your just running a head.

 

[driller]

what kind of fuel are you running straight gas 91 or are you mixing in some race fuel.

 

[BIG HEAD]

I run 20% 111 VP with 91 premium.