650 sx 44sbn carb setup

[barmenta]

Can somebody please tell me where to start with the setup on the 44 sbn for needle settings, jetting, pop off pressure. operating at 6500 ft above sea level.
thanks a lot !!!!

1987 650 sx
44 sbn carb
westcoast intake manifold
west coast exhaust and manifold
Mariner head
compression 125
91 octane
40/1 mixture

 

[sflsurfrider]

ive always had good luck using stock yamaha 650 settings with a stock SJ airbox for a starting point.

 

[Cliff]

compression sounds low, especially for that head. mine had a 1.5 needle & seat 122.5 low and a 180 main jet. thinking i had the gold spring, whichever one raised the pop off. may wanna try a 160/165 main first

 

[sflsurfrider]

the compression will be lower, at 6500 ft above sea level, than at sea level.

he said he has a mariner head, but didnt mention dome size.

you used a 180 main on a 650 kawi? thats seems a little rich.

 

[tor*p*do]

set up a 650sx with a 44 SBN this weekend
stock pipe and head, 150 psi
ended up running 120/150
1 turn out each
you probably want fatter with pipe and head
but I am at 1000 feet so it may cancel out

 

[Cliff]

the compression will be lower, at 6500 ft above sea level, than at sea level.

he said he has a mariner head, but didnt mention dome size.

you used a 180 main on a 650 kawi? thats seems a little rich.

that ski kicked my tail for months before i got it to run right. the higher i went on the main, the better it ran. no hesitation, no hiccups, it was truely a good running ski setup pretty close to his. i did learn something though, i didnt know elevation would affect compression that much. i guess you learn something new all the time.

 

[3wheelerdude]

I am running a 180/120 setup on a stock 650kawi with Westcoast pipe and it runs real good. Plugs do get darker than I like but it runs so good I am not changing it.