A quick carb question...leaking venturi's

[Watty]

Guys,

I'm running a set of 46 Mikuni's on my 701 and have found that under idle the inner venturi seeming to be leaking fuel.

I have a popoff of around 20psi and have rebuilt the carbs completely from top to bottom including new needle and seats. I have a spare set of new needle and seats and I still have the same problem.

I keep wet fouling spark plugs, and I find if I have the plugs loose in the head the fuel slips past them and covers the head with unburnt fuel.

Is there anythinkg that would cause the venturi's to leak? It's really annoying me!

Other info...ported, 165psi comp, type 9.

Thanks.

 

[superramjet]

pop off it too low, motor is shaking the needle from the seat, start raising it slowly till the motor bogs. Brazina told me to run pop off as high as you can.

 

[Watty]

Roger....(ramjet)

Will do....cheers!

 

[steve802cc]

Just saw this today.
I agree with Ramjet.
You can also double up on the check valve that is on the back of the pie shaped piece (valve body assembly).
In the Mikuni tuning manual http://www.mikuni.com/pdf/sbn_manual.pdf
the check valve is #12
the valve body assembly is #39
in the exploded view of the carbs.

Later
Steve