carb jet

[riverdweller]

Question for you clone pro's.

For a 6.5 clone, would like to improve air in and exhaust out. Using a foam aftermarket air cleaner with one of the exhaust pipe/headers out there, I have to imagine a larger jet would be required. What size larger jet would be a good starting point?

Thanks for any feedback.

 

[keffer]

I bought the 90 jet and it is too lean with just an air cleaner and header. I am also using a 0.01 longer rod. I think its the cold weather out. I plan on drilling the jet larger tomarrow.

 

[C9H13NO3]

Use a 92 jet.

 

[mmisterbungl]

92 is a good one for those upgrades.

 

[steveweippert69]

i hear the 92 works well its what we use in the kart engine's

 

[Joerex]

damn i just installed a 90 jet and 140 e tube, is that a good set up for fuel?

 

[steveweippert69]

the 140 e-tube will richen up the fuel curve

 

[Joerex]

also read that the 140 e tube will improve torque?

 

[C9H13NO3]

also read that the 140 e tube will improve torque?

Yes it will improve your low end grunt.

 

[riverdweller]

Thanks guys,
Your input is very helpful, with the cold weather and the need to ride I will try both the jet and the e-tube.

These clone and other OHV engines are some what different from the good old days of the B&S and Clinton. 40 years or so ago.

 

[keffer]

I brought a #61-80 drill set today and ended up at 0.037" I think a#64 drill. Nice difference in performance. I plan on running this for a bit and then checking the plug to see if I should go bigger. I drilled my original jet so I can go back to the 90 in summer if I have to.