Hi, i have a 2001 gp1200r with lots of things done to it, i got the ski with 2 blowing pistons, i replace them clean the carbs, and notice the hitgh is 125 and the low has no numbers, the nidle and seads oem, i gess, i move the low setting screw 1 and 1/2 and the same with the higth, the ski doing about 60mph, at 6000 rpm bugs out like lack of gas but when i give full trhotle dosen't do it, it goes, 73 on gps, ski has stage II plus the extended pump, and ported exhaust, milled oem head for 93 pump. can any body help me, thanks

Welcome to our forums!

The numbers on the lows are on the side of the jet. Set your low speed screws at 1 turn out and your highs at 1-1/2 and adjust from there.

If you post up the complete carb jetting specs we will check if they are right. (Sorry but we need to know what the lows and the needle and seat are.)

Is the accelerator pump still being used on the carbs?

Have you removed all of the OEM black intake parts?

It sounds like it could be lean, so I wouldn't run the ski again until you you sort things out. This could also be why it lost the 2 pistons. Lean is bad because the lack of fuel lets the motor overheat and this leads to seizures.

On behalf of jacomo (posted in a different thread, but relative to your response Philip_GPR)

"Hey philip thanks for replying, i can adjust the top or hitg nedles, but the lower ones the first carb is hard to reach, are the lows could be causing this? my hitgs are 130 lows are 110 the nedle and seet is Oem, the hitgs are 1-1/4 the lows set at 1, run the ski same problem bug out at 6000 RPM but at full trotle, runs fantastic, i took off the plugs and look a litle wet, i put new plugs, move the higts a 1/4 more same move another 1/4 same 1-3/4, like i said i could not reach the lows, could this be the problem? should i tried? oh i also have the accelarator pump from a 2000 milenium edition wich is a bitbiger, should i take it off?"

a) it is not the low speed screw (this affects idle)

b) it is not the high speed screw (this affects top speed)

c) the 2001 and 2000 use the same accelerator pump

Questions:

1) At 6,000 rpm does the motor die ? or does the motor load up and stumble ?

2) What is connected to the carbs? Have you removed all of the black plastic intake pieces? Have you installed feee air filters? with water covers?

3) is the accelerator pump connected and being used?

Hi philip and thanks, at 6000 RPM bug otu like is not getting gas, (it won die, cain of pulling in and out) does it for this transit whe it get to open trothle goes great no hesitation, i have pro k filters, the accelerator pump is hook up

OK

to give it more fuel in the 6,000 rpm range you could

change the needle and seat from 1.2 to 1.5

change the needle and seat spring to 95 grams (dull silver)

http://www.mikuni.com/pdf/sbn_manual.pdf

please report back what the results are

Hi, philip, like i wrote i sold this ski, year 1 1/2 ago, got it back so i dont know if some one drill the nedles so i just change every nedle just to make sure, i install 105 lows, 125 higths, nedle and seat 1.5 and the 95 gram spring, 1 turn for the lows "T" and 1 1/4 for the higths, it is cain of scary ride this ski with the seat slitghly open it is loud, also it was nobody else at the lake (in case i need it some help) any ways the ski seems to run fine now, also i notice seems to be better on gas, i"ll let you know soon, thank you very much for your tips, by the way i bouth staff from you on "EBAY", i'm vigor4

Hi philip i run the ski a few more times and no isues, it is running extrimly well, thank you very much for your tips

good to hear, glad I could help