Super Jet 760 compression

[Big Kahuna]

Yes, It could be sucking air. I had a Primer line hooked to a feed line once. Ski ran like a raped ape for about 15 seconds then fell off...... we rejetted, even swapped carbs. Then Tricky was riding it with the hood off and hit the gas and saw air bubbles going from the "T" in the line to carb. removed the T, hooked back up and all fixed.

 

[MTRHEAD]

Call Chris @ Newmiller and ask him what CC domes to run....

You are low due to port heights. ADA specs are for stock cyls, and in our findings tend to be very conservative. Your location, and elevation will make a difference also. I am guessing your gauge is reading a little low as well.

Retail ADA domes are also conservative squish clearance and design. Great for Rec average person who wants a "head". Those Domes are not what would be used for high level competition

Is that applicable when using pump gas 95 octane?

If you have an all out race cylinder, under 800cc, the right pipe stinger, , the right prop load, and the right ignition timing you can run 95 all day on pump with 26cc. I ran my superstock with 22 or 23cc domes when I raced superjets and 26's off-season with good pump.

 

[Ahmed AN9]

I had a chance to talk to Newmiller about the dome size I should have, he said I can use whatever size I want !!

 

[Ahmed AN9]

Yes, It could be sucking air. I had a Primer line hooked to a feed line once. Ski ran like a raped ape for about 15 seconds then fell off...... we rejetted, even swapped carbs. Then Tricky was riding it with the hood off and hit the gas and saw air bubbles going from the "T" in the line to carb. removed the T, hooked back up and all fixed.

Mine is turned out to be the fuel filter positioning of the fuel line. Which is the filter inlet and outlet are not in line where the fuel out is going up and fuel in is down.

 

[Ahmed AN9]

Retail ADA domes are also conservative squish clearance and design. Great for Rec average person who wants a "head". Those Domes are not what would be used for high level competition


If you have an all out race cylinder, under 800cc, the right pipe stinger, , the right prop load, and the right ignition timing you can run 95 all day on pump with 26cc. I ran my superstock with 22 or 23cc domes when I raced superjets and 26's off-season with good pump.

As per ADA website 22, 26cc domes are for motors using flat top pistons. I have 84.5mm Pro-X pistons.