05 King 900 carbed - Setup for SLP twins/Advice

There is nothing wrong with these pipes. You should tell us more about how it is set-up now. What elevation he rides,track size...PB

also what else is done to it - airbox gutted, flowrites, reeds, etc? More air needs more fuel. For what it's worth I have the same sled with the SLP twins, performance porting and heads, vforce 3, slp airbox, vents, etc. I am running a 390 jet between 8-10K for most days I think that is temps of 20 degrees. Can go as big as 430 if it is really cold and elevation 6-8K. Also have blue primary and Heel-x secondary with red spring and 68 gram weights. I think helix is 46 degrees but not sure. It pulls 8000 rpm all day long at that setup.

you are going to need more wieght than 64g.. You should be close to the 68- 70 mark. Run 390 or 380 jets in it. just watch your tempature at lower elevations. run your needle on the forth setting from the top. (i will check my book to double check)

i have ran mine as low as 1500Ft with 380`s and the temp wasn`t to hot. you will have a nice crisp throttle.

agreed on needle setting - mid range is where it is really lean. I have mine shimmed at 3.5 and watch temps pretty close. 380's sound pretty small to me, but if it works for you then great. If I ran those my throttle wouldn't be the only thing crispy! I had a link to SLP's instructions at one point, have to see if I can find it. I also have a "jet chart" that I made for the SLP twins. I'll try to get a post of that up.

found the chart from SLP

I took this off of their website a couple years ago...

SLP Twins w/ Temperature
Stock Airbox
-40 to -20F -20 to 0 F 0 to 20 F 20 to 40 F
Altitude PTO MAG PTO MAG PTO MAG PTO MAG
2000' 470 480 460 470 450 460 440 450
4000' 450 460 440 450 430 440 420 430
6000' 420 430 410 420 400 410 390 400
8000' 410 420 400 410 390 400 380 390
10000' 400 410 390 400 380 390 370 380
12000' 390 400 380 390 370 380 360 370

SLP Twins w/ Temperature
SLP Airbox
-40 to -20F -20 to 0 F 0 to 20 F 20 to 40 F
Altitude PTO MAG PTO MAG PTO MAG PTO MAG
2000' 480 490 470 480 460 470 450 460
4000' 460 470 450 460 440 450 430 440
6000' 430 440 420 430 410 420 400 410
8000' 420 430 410 420 400 410 390 400
10000' 410 420 400 410 390 400 380 390
12000' 400 410 390 400 380 390 370 380

crap, formatting didn't work out, but you can figure it out.

Dont ride it on the roads. If you HAVE TO ride a road or trail keep the throllte moving !!! Those pipes have a WICKED lean spot in the middle that its near impossible to get ride of. You run down the road at 1/4 throttle for 5 miles your going to need new pistons!! I gave up tring to tune my twins, burned down 2 motors, went back to stock. Keep am eye on your EGTs ALL the time. These pipes run great when they do. One day they will be great, 2 days later on the same mountain the sled bearly runs.