Burble at 70 mph

[Blue shadow]

At 10 psi at 70 mph she burbles ,would this be a lean setting or rich ,should I jet up or down?THANKS

 

[Ted Jannetty]

At 10 psi at 70 mph she burbles ,would this be a lean setting or rich ,should I jet up or down?THANKS

Could be lean there, you can try lighter springs and or raise needle since this is a part throttle problem.

 

[Turbo Tim]

At 10 psi at 70 mph she burbles ,would this be a lean setting or rich ,should I jet up or down?THANKS

I assume you mean 70 MPH at wide open throttle ? ( and not part throttle?)

 

[hlmrx1]

At 10 psi at 70 mph she burbles ,would this be a lean setting or rich ,should I jet up or down?THANKS

Could be lean there, you can try lighter springs and or raise needle since this is a part throttle problem.

Blue Shadow, if you left the needles at the stock setting, raise them by one clip like Ted says, the burble will be gone.

 

[BlueByYou2000]

What are you running for fuel? if your octane is to high, you could experience that burble your talking about. But normally the burble shows up on the bottom end out of the gate...BBY

 

[Blue shadow]

Just running 91 oct for now.Went out trail riding last night and put on 50 miles.I have a high flow exhaust with the k and n filter on the outside .My needles are in the stock position with 132.5 jetting .With all the mods I have done I get a burble at take off and at 70 mph and clears out after that.I was running 130 jetting last year with the filter on the inside and stock exhaust.Also have lob centers at 114 .THANKS again .Can t wait to try 16 psi.

 

[TWIN TURBO]

Hope you have low compression pistons or a head shim along with that 10 psi and 91 octane fuel or you will be burbling your way to the engine shop. Not trying to be smart but be careful LOL.
132.5 is not overly rich jetting.

 

[Blue shadow]

Low comp pistons 10 to 1 and rods done. Ran it stock on 10 psi most of last year on 91 oct and every thing look fine when I replace it with low comp pistons.You can run the simons cpr at 10 psi with 91 oct .