quick question - OEM 38mm carb

[Polish jet pilot]

Hi all,

I got a Bpipe and not sure whether I need to change the springs or not (I know I need 95 gram ones). Which springs the oem 38mm carbs use?

Thanks!

Andrew

 

[SUPERTUNE]

Stock 96-up have 115 gram springs stock from Yamaha, use 95's then tune jets to match engine setup.

 

[Polish jet pilot]

Perfect! You always there Supertune!

Thx!

 

[DC SUPERJET]

hmm the factory pipe website says to use the 95 gram springs, but it also says that 95 gram springs are stock on the sj....look here on page 4

http://factorypipe.com/media/instructions/yamaha/701SJ03.pdf

Now I'm confused because I'm about to install my b-pipe as well. All I ordered was new mains, because that is the only thing recommended on the website. I figured I would just start there and try and tune from there. Do I need to change the springs too? Sorry for the thread jack...

 

[Crab]

Whatever gets you the 55psi popoff.

 

[Polish jet pilot]

No problem bro, I had exactly the same issue, buy I guess Crab got it right? 55 psi pop off?

I am pretty sure that we will need the 95 gram spring anyways. Besides I think you should change the LOW jets too. SUPERTUNE recommended 72,5 if you play with the throttle a lot, and 75 if you don't.

 

[DC SUPERJET]

ok i'll guess i'll just have to test it and see. Thanks.