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I decided to post a new thread for some additional visibility to the people frequenting the carb/fuel forum.
This is related to my 1978 GS1000E restoration
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Quick motor specs:
Wiseco 1100 big bore kit
Ported heads
Oversized valves
More aggressive cams - see specs below
Carbs - Mikuni RS34's
Current jetting specs:
#20 Pilot (originally 17.5)
#125 Main (stock)
9DZH1 needle (stock), -3 clip position
#568, P-4 needle jet (stock)
Accelerator pumps are tuned to start at 1/4 throttle and end at 3/4 throttle
Here's what I'm trying to tune out:
Sneezing and flat acceleration from 1/8 throttle to just over 1/4 throttle with GENTLE turning of the throttle. If I mash the throttle, the accelerator pumps kick in and the aforementioned problem is less obvious.
I had a 17.5 pilot jet and had a lot of sneezing through the carbs at 1/8 throttle. Pilot fuel screw was maxed out. Installed a #20 pilot jet and had my fuel screw set to 1/4 turn (range is 1/4 to 1/2 on the RS carbs). 95% of the sneezing disappeared. Decided to open the fuel screws another 1/8 turn and ride the bike - sneezing is no better/no worse, but the idle got a bit worse, indicating that I may be running a bit rich. My plan is to go back to a 1/4 turn (maybe a hair more) on the fuel screws.
At this stage, I'm thinking about raising the needle by one position.
Your input is greatly appreciated!
This is related to my 1978 GS1000E restoration
Quick motor specs:
Wiseco 1100 big bore kit
Ported heads
Oversized valves
More aggressive cams - see specs below
Carbs - Mikuni RS34's
Current jetting specs:
#20 Pilot (originally 17.5)
#125 Main (stock)
9DZH1 needle (stock), -3 clip position
#568, P-4 needle jet (stock)
Accelerator pumps are tuned to start at 1/4 throttle and end at 3/4 throttle
Here's what I'm trying to tune out:
Sneezing and flat acceleration from 1/8 throttle to just over 1/4 throttle with GENTLE turning of the throttle. If I mash the throttle, the accelerator pumps kick in and the aforementioned problem is less obvious.
I had a 17.5 pilot jet and had a lot of sneezing through the carbs at 1/8 throttle. Pilot fuel screw was maxed out. Installed a #20 pilot jet and had my fuel screw set to 1/4 turn (range is 1/4 to 1/2 on the RS carbs). 95% of the sneezing disappeared. Decided to open the fuel screws another 1/8 turn and ride the bike - sneezing is no better/no worse, but the idle got a bit worse, indicating that I may be running a bit rich. My plan is to go back to a 1/4 turn (maybe a hair more) on the fuel screws.
At this stage, I'm thinking about raising the needle by one position.
Your input is greatly appreciated!