760 jetting

[chunky]

i have recently had my 97 superjet bored out from 701 to 760
it has a b-bipe and riva head, no porting, stock carbs.
main jet is 135
pilot jet 70
95g spring
stock neddle and seat
is there need for change now i have the 760 and if so (or not) what would be a good starting point for tunning in the high and low speed screw settings

 

[chunky]

i know its another jetting question :sad: basic for most but i`m kinda new at this

 

[chunky]

is this to basic a question to answer

 

[marz831]

I am by no means an expert, but I would step up both your mains and pilots at least 5 points and see how it feels from there. Did you have the cylinder ported or just bored?

 

[Matt_E]

Eh....if all you did was bore it, the jetting should remain the same. However, jet up 5pts on each and go down from there.

 

[chunky]

just had it bored, no porting
so should i start about 2 turns out on each high and low speed screw and work my way in for tunning or is that to much
thanks for the input i`m sure these type of questions get boring

 

[Matt_E]

No.....you need to jet up 5 pts on pilots and mains, start with 2 turns out on both high and low adjusters, and then tune per Mikuni Tuning manual.

 

[chunky]

thanks

 

[shepster]

Hi, if you just bored from 701 to 760 i would be carefull as to the port sizes. Harry Klemm Group K told me they are way undersized without being ported for the bigger bore when going to 760.
Just my o2.


James

 

[chunky]

i will check up on that one
the guy that bored it is from from uk mainland and has a great rep for doing this work
but it will do no harm to ask
thanks.