12-26-2007, 07:31 PM #1
What does removing the acc pump do?
What does removing the accelerator pump do? I have read about many ppl doing this, but what exactly does it do?
12-26-2007, 08:15 PM #2
1) on the US skis the accelerator pump only feeds cylinders 1 and 3 (this is kinda strange if you think about it)
2) skis with accel pumps often bog off idle
3) accel pump only feed fuel once when you squeeze the throttle this has an effect (once) mostly in the lower rpm range
If you remove the accel pump you can increase the size of the pilot jet
1) all 3 cylinders will then get the same amount of fuel
2) the ski runs clean off idle
3) the larger pilot jet provides more fuel throughout the complete rpm range, including the mid range (6000 ish) where these carbs are notoriously lean at.
12-26-2007, 08:49 PM #3
Very good explanation Phil.
12-26-2007, 08:53 PM #4
Well I have rejetted to 120mains, 110 pilots, 95G spring, 1.5 needle and seat. So should I remove my accel. pump?? I still have the stock choke... Cant I just simply zip tie the lever back??
12-26-2007, 08:59 PM #5
yes I suppose you could zip tie the arm back
most of us just leave the pump there and we remove the cam that moves the lever
if you remove the cam then you can use the pump as a primer (a primer works much better than a choke for starting a cold motor)
12-26-2007, 09:00 PM #6
On my friends ski, I removed the lever from the rear carb and flipped it over. I rejetted the carbs and tied a tystrap to the accel pump lever. Now the accel pump is disabled, but he can yank on the tystap to use the accel pump as a primer.
12-26-2007, 09:04 PM #7
Ok thanks guys! Is there any freakin way to to this with the exhaust on! There isnt really any room to work on the carbs with the exhaust on!
12-27-2007, 12:48 AM #8
12-27-2007, 08:56 AM #9
lol! Well I guess I know the answer to that! Whats the best way to remove the exhasut?! I have trouble "snaking" it in that small space! Do you take it completely apart. Like do you take apart the section where the cat/dplate is? And the lower small section where the water temp sensor is down before the waterbox?? Or do you have to loosen the motor mounts and slide the motor forward and to the side? Whats the trick?! Im have hell trying to get that thing in/out! And im not sure on the space difference between the GPR and XL Limited...
12-27-2007, 09:00 AM #10
BTW Woody I love the acceleration on that prop! I tested the ski for the first time in a small pond I have here at the house! WOW that ski has some power! Not enough room for a high speed run, but I got up to about 30 or so. I mainly wanted to check for leaks, and warm it up/break it in a little! Going to the lake today to see how fast she can go! I will keep you posted on my results!
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