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Pops n farts under 7k rpm

  • Thread starter Thread starter Rustyhooker
  • Start date Start date
R

Rustyhooker

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History
1979 gs750
ported head
.040 over bore with weisco pistons
pods (oval)
4 into 2 short pipes just baffled
went up 3 jet sizes
clips one from the top?
idle air at 1 3/4 turns

followed carb recommendations from here for set up

so now she starts first kick
runs great up to about 2000 rpm
pops and farts to 7000rpm
then goes like a bat outa hell and tries to rip your arms off

what am I doing wrong

thanks
 
Pops, farts, Rustyhooker, aw man there is toooooooo much material there..............................must resist.................
 
If it goes well after 7K then I would say the main jet is fine.

Needle height adjustments should do it.

And of course, you have done a full strip of the carbs with new O rings and carb rubbers? Haven't you?
 
O so the clips were at second from the bottom so I moved them all the way down. Checked my plugs and looks like I'm running lean. Whitish tips and all. So next is a ride and see what happens. The screws on the bottom of the carb were taken out for the cleaning etc. Any recommendations as to where they should be? Thanks again
 
Rustyhooker said:
O so the clips were at second from the bottom so I moved them all the way down. Checked my plugs and looks like I'm running lean. Whitish tips and all. So next is a ride and see what happens. The screws on the bottom of the carb were taken out for the cleaning etc. Any recommendations as to where they should be? Thanks again
Click to expand...

The screws on the bottom are the pilot jets. One full turn out should be fine.
 
Rustyhooker said:
O so the clips were at second from the bottom so I moved them all the way down. Checked my plugs and looks like I'm running lean. Whitish tips and all. So next is a ride and see what happens. The screws on the bottom of the carb were taken out for the cleaning etc. Any recommendations as to where they should be? Thanks again
Click to expand...
Finally put it back together and took er out fer a rip. Smoother transitions fro 3-7k but still poppy and farty at 3-4K Pipes to short and free flowing? Any help would be great. Thanks
 
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