maverick
Extreme
All,
I have two 2003 Mtn sleds (blue and black). I've been fiddling with different jetting combinations ever since I bought my blue one new in Nov 2002. I've asked for jetting help a few times on this and other sites and have only gotten bits and pieces of good and bad advice (I also did a search). So what I have thus far is not complete but I'm very close and to finish the job I need some help finding one last piece of the puzzle. The stock needles are too LEAN (I'm at the lowest clip) for set-up I'm at so I need the part number for the next richer needle, hopefully with the five clip positions like the stock one.
I ride in Grand Lake, Colorado, which is about 8,700 to about 11,500 feet in elevation. When I first got my first sled it ran rich, SUPER RICH. I played with the jetting but didn't get very good results. Then I tried adjusting the float level. BINGO! The float levels were all over the place and extremely high (or rich) so I lowered and synched the floats. This eliminated the downhill stalls and helped lean-out the jetting. It ran good but I wanted more. So I played with the jetting some more and then I decided to drill-out the air box. It didn't make any sense to run this motor through such a restrictive air box. I also clipped 1 3/4 coils off the stock needle spring to compensate for the altitude. Now that she could breathe she ran LEAN. I lowered the clip on the needle to the lowest position and she runs good but hessitates at low altitude and runs better the higher I ride. The main jets are 130's right now and I'm going to try 132.5's to see if I can get any more top end. Right now she'll pull to 10,400 rpm. I'm running a White Knuckle pipe on this sled as well and I'm guessing that that contributes to the lean condition.
I'm sure every one of these sleds runs differently (mine do), but I think this info would be helpfull to someone who is struggling with their high altitude jetting or someone coming out west for some mtn riding and needs some idea of what jetting to use. I'll keep you posted on the final settings that I end-up at. And please let me know where I can find that richer needle.
Thanks,
Maverick
I have two 2003 Mtn sleds (blue and black). I've been fiddling with different jetting combinations ever since I bought my blue one new in Nov 2002. I've asked for jetting help a few times on this and other sites and have only gotten bits and pieces of good and bad advice (I also did a search). So what I have thus far is not complete but I'm very close and to finish the job I need some help finding one last piece of the puzzle. The stock needles are too LEAN (I'm at the lowest clip) for set-up I'm at so I need the part number for the next richer needle, hopefully with the five clip positions like the stock one.
I ride in Grand Lake, Colorado, which is about 8,700 to about 11,500 feet in elevation. When I first got my first sled it ran rich, SUPER RICH. I played with the jetting but didn't get very good results. Then I tried adjusting the float level. BINGO! The float levels were all over the place and extremely high (or rich) so I lowered and synched the floats. This eliminated the downhill stalls and helped lean-out the jetting. It ran good but I wanted more. So I played with the jetting some more and then I decided to drill-out the air box. It didn't make any sense to run this motor through such a restrictive air box. I also clipped 1 3/4 coils off the stock needle spring to compensate for the altitude. Now that she could breathe she ran LEAN. I lowered the clip on the needle to the lowest position and she runs good but hessitates at low altitude and runs better the higher I ride. The main jets are 130's right now and I'm going to try 132.5's to see if I can get any more top end. Right now she'll pull to 10,400 rpm. I'm running a White Knuckle pipe on this sled as well and I'm guessing that that contributes to the lean condition.
I'm sure every one of these sleds runs differently (mine do), but I think this info would be helpfull to someone who is struggling with their high altitude jetting or someone coming out west for some mtn riding and needs some idea of what jetting to use. I'll keep you posted on the final settings that I end-up at. And please let me know where I can find that richer needle.
Thanks,
Maverick
spray25
TY 4 Stroke God
maverick said:
At what throttle position and rpms? are you sure it isn't a pilot jet problem?
Check these out:
http://www.factorypro.com/tech/carbtune ... gines.html
http://66.47.68.116/tech/pilot%20jet,%2 ... ruise.html
maverick
Extreme
It could be partially the pilot jet (I'm at 1 1/4 turns out, too lean I think). But it seems that the biggest part of the problem is in the mid to upper range of the throttle position. I'm going to tune some more this Wed to see if I can improve where I'm at.
Maverick
Maverick
maverick
Extreme
Anyone have any ideas on where to find a richer needle jet?
Maverick
Maverick
maverick
Extreme
Ok,
The fine tuning is done and I'm more than pleased with the results!
Once again, my float level is at the extreme LEAN end of the factory spec. I have a White Knuckle exhaust. And I drilled-out the air box in order to let the motor breathe (probably close to same flow as a K+N filter kit). Anyone using this jetting info should use this as a guideline depending on what mods you have done to your motor. I ride at 8,800-11,000 ft here in Grand Lake.
Pilot Screw: 1.5 turns out
Main Jet: 132.5
Needle Clip: clip on bottom position with BOTH washers under clip
I couldn't find a richer needle without having a custom needle made by 'Factory' which would be nice, but expensive. So I took the cheap way out and used the stock needle with the clip in the bottom position and I just put both washers under the clip to richen it up just a little more.
I climbed a hill that I've never been able to climb to the top of today, TWICE. In fact the last fifty or so feet to the top I was at about half throttle!
Maverick
The fine tuning is done and I'm more than pleased with the results!
Once again, my float level is at the extreme LEAN end of the factory spec. I have a White Knuckle exhaust. And I drilled-out the air box in order to let the motor breathe (probably close to same flow as a K+N filter kit). Anyone using this jetting info should use this as a guideline depending on what mods you have done to your motor. I ride at 8,800-11,000 ft here in Grand Lake.
Pilot Screw: 1.5 turns out
Main Jet: 132.5
Needle Clip: clip on bottom position with BOTH washers under clip
I couldn't find a richer needle without having a custom needle made by 'Factory' which would be nice, but expensive. So I took the cheap way out and used the stock needle with the clip in the bottom position and I just put both washers under the clip to richen it up just a little more.
I climbed a hill that I've never been able to climb to the top of today, TWICE. In fact the last fifty or so feet to the top I was at about half throttle!
Maverick
