Enough Fuel?

[FlightPlanDan]

I've read the tech-faqs and don't see an answer.

I'm having a carb tuning issue. Just installed a B-pipe and an MSD enhancer.

The low speed seems good. braps nicely from idle.

The high speed is my problem. Re-jetted stock mikuni 38's with 75 pilots and 135 mains.

I'm out over 3 turns on the highs, but when I check the plugs after a wide-open cut off, they are clean as a whistle. No charcoal color, not white, but clean as if they were bead blasted. (I've always been told that a tan/brown/charcoal color is optimum.White lean, black oily-rich)

Could this be caused by the pipe tuning? The top and middle water jets are closed and the bottom is open about 1 turn.

I had no problem when I did this to my wifes ski. (no enhancer). It took about 30 minutes and it's been good ever since.

Thanx in advance for any input!
Dan

 

[JetManiac]

If you are 3 turns out, then you should increase the jet size I think.

 

[masterblaster]

how much time you have on the plugs? Yes the b pipe settings can deff cause lean plugs,I have some questions regarding this ill start another thread over.anything over 2 turns out is doing nothing on the carb screws,youd be better off going to 137.5 or 140 mains.

 

[FlightPlanDan]

how much time you have on the plugs? Yes the b pipe settings can deff cause lean plugs,I have some questions regarding this ill start another thread over.anything over 2 turns out is doing nothing on the carb screws,youd be better off going to 137.5 or 140 mains.

I had put fresh plugs in that morning. At this point there's no more than a couple hrs on them.

I knew there was a point when more adjustment does nothing, but I didn't realize it was at 2 turns. I wasted a bunch of time going 1/8 turn per run!

 

[OCD Solutions]

I've had to run some older already baked plugs to get hem to read. I was mixing AV gas at the time and it burns so clean that the plugs were very hard to read in short runs.

 

[FlightPlanDan]

I've had to run some older already baked plugs to get hem to read. I was mixing AV gas at the time and it burns so clean that the plugs were very hard to read in short runs.

The low speed gave a very nice read. went way rich at first then backed it down til it looked good.

Also, I forgot to mention that It's running about 20 degrees hotter than usual. (about 160) .....lean condition or pipe tuning?

 

[OCD Solutions]

I thought that freeride/freestyle setup on the b-pipe was top 2 screws closed and bottom open a 1/2?

 

[FlightPlanDan]

I thought that freeride/freestyle setup on the b-pipe was top 2 screws closed and bottom open a 1/2?

The Fp paperwork says top 2 closed and bottom open 1 turn to start for low end power. Then a few pages forward it says 3/4 turn to start. I started at 3/4 and opened to 1 in an attempt to cool & richen. (fishing) And that bottom screw is a joyfull thing to adjust, lol.