Pop off pressure 701 b pipe

Krog

Krog

Location
United States
I’m running 62t/61x, dual 38, 135/75, msd, b pipe. Stock reeds, for now......
What should I be looking for in pop off pressure. I’m at sea level and getting 30 psi on both now.

Thanks!!!!
 
smoofers

smoofers

Rockin' the SQUARE!!!!
Site Supporter
Location
Granbury, TX
Are you running a stock airbox or aftermarket flame arrestors? I'm running a similar setup with a stock RN style airbox and have my pop off at ~42psi. If you have a/m FA's you'll want significantly lower pop off.
 
smoofers

smoofers

Rockin' the SQUARE!!!!
Site Supporter
Location
Granbury, TX
Krog said:
I’m running stock on mine.
Click to expand...

I think stock pop off is around 50psi, mine runs great at 42. I'd try and get it a bit higher than 30. If the next higher rate spring gets you too high, then go back to the spring you were using and tweek the arm to give a few more psi. Just make sure the spot that the diaphragm contacts sits level and isn't so high that it keeps the needle from fully closing when the diaphragm cap is bolted on.
 
Vumad

Vumad

Super Hero, with a cape!
Location
St. Pete, FL
M y stock motor stock porting is bored 1mm, stock carbs. Jetting is 75/140, popoff of 18. Ski runs great. Tuned by bad boys racing. Could go a tad leaner in the surf but I'm a rec rider and need that extra fuel for bouys.
 
smoofers

smoofers

Rockin' the SQUARE!!!!
Site Supporter
Location
Granbury, TX
Vumad said:
M y stock motor stock porting is bored 1mm, stock carbs. Jetting is 75/140, popoff of 18. Ski runs great. Tuned by bad boys racing. Could go a tad leaner in the surf but I'm a rec rider and need that extra fuel for bouys.
Click to expand...
What flame arrestors? I am assuming aftermarket with a pop off that low....
 
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