I think everyone has a differnt rule of thumb :-)
I am having me some VERY sexy drag pipes made for my bike from CPI.. Greatest part about K&T and CPI being 40 minutes from me .
Okay lets back up a second here.
When you changed your head what head was on before? Stock?
You buy a new oring kit?
I you need to make sure you have almost equal compression -+ '3PSI'.
I think the head was not put on correctly or the domes were incorrect and squish was also not checked....
These are worth at least 280-300 dollars in their stock 34 mm bore.
K&T are VERY big into these carbs and almost always recommend them in 35.5 bore size.
I wouldn't take less than 250.
Free bump these carbs are AWESOME
That dyno above was with a mixxer port job FYI.
I also raced quite a few at the dunes I wasn't impressed with them. I also thought it looked funny at KBR's shop there was a bran new one with those little tires...
O-well
Stock they are lame machines, nice to look at and the EFI just like the King Quad is nice. But if it screws up on you your SOL.
here is what I'm talking about.
I have quoated this from my friend Kam @ KBR...
"We put Buddha
KBR had a stock one on the dyno go from 38HP Stock to 48 HP with custom pipe and stuff ported head ect....
my 450r has gone up against a few of them with my friend who is 100lbs lighter than I am and he walked all over them...
g-force is lifetime... that is what I run on my 450r and that is why I bought it over LSR and Durablue... even if it bends I can keep getting new ones :-)