Max power from 1150 carbs on my gs1100

[Guest]

I've tried so many jet combinations to get my 80 gs1100 w/1 mm oversize intake valves and mild port job to produce maximum power at the drag strip that I can't remember my original combo.
Right now I'm running 130 main, 45 pilots and 160 air jets, stage 3 Dynojet kit, needle in the middle, Ape pods and V&H 4-1. The bike idles great and acceleration is good but at steady throttle between 3-5 thousand, the motor misses and backfires. I've had to turn the air screws about 6 turns out to get it to run this good. I'm thinking about raising the needle one notch to start with as it seems lean.

Any other advise?

 

[posplayr]

Assuming you pull to redline using the 130 mikuni main; work on the needle. If it is popping it is probably lean.

 

[Guest]

Put the needle on the second notch from the bottom and lose the DJ washer

 

[rapidray]

Also, go to 47.5 pilots & 140 mains. Will be an entire different bike!!!
Ray.

 

[posplayr]

Also, go to 47.5 pilots & 140 mains. Will be an entire different bike!!!
Ray.

I'd figure his main is not far off, but I blanked on the 47.5 pilot jet.

 

[Guest]

Don't 1150 carbs come with 47.5? or just Canadian carbs?

 

[posplayr]

Don't 1150 carbs come with 47.5? or just Canadian carbs?

Dunno; but with 4:1 and DJ needle you need the 47.5.
with 4:2:1 and DJ 45.0

 

[trippivot]

Mine are set with 47.5 pilots - dynajet kit #3133 - which has the 160 air corrector - DJ138 main jets and the needle set at position #4 from the top with a washer

 

[streetfighters]

Is jetting altitude dependent? What altitude are you racing at?

 

[jimb12]

Is jetting altitude dependent?

Yes altitude changes jetting requirements. Higher altitude=thinner air=need smaller jet, and vice versa.