Mikuni Pilot jet pocket tuner?

SMV RYDER

SMV RYDER

Location
Aspen, Colorado
I just got the Mikuni pocket tuner but it doesn’t help with the pilot jet? I am trying to figure out what to run at 7800 ft above sea level with a stock WB2 760 with dual 44’s. Do they sell one for the pilot jet? Thank you for your time.
 
SMV RYDER

SMV RYDER

Location
Aspen, Colorado
Quinc said:
If the tuner says to go down 2 jet sizes on the main jet, you could probably go down 2 jet sizes on the pilot as well?
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Thank you for the response. I am running 127 mag and 130 pto with a 115 pilot jet. According to the Mikuni main jet pocket tuner I should 120 and 122.5 so probably going to give the 112.5 or 110 Pilot jet. I am having a terrible stubble getting off wfo and getting pack on the throttle. Pop off is 42 lbs. I am 1.5 turns out on the low speed screw. Going a full 2 on Saturday In quarter increments.
 
Mobile Chernobyl

Mobile Chernobyl

Location
1 Mile High in Colorado
SMV RYDER said:
Going to give a full 2 turns out Saturday. Jetting a jet ski for high altitude riding is truly a pain in the ass.
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Did you try stock jetting first?

I've run my ported 760 WFO for 10+ seconds with the same jetting at havasu and ruedi without issues. Is it a bit rich at ruedi? Yea a tad, but I usually only need to compensate with 1/2 turn on the highs and 1/8 or so on the lows.

If you're not having luck with stock jetting and fiddling with the screws, jet down accordingly and I'd guess you'd need 5 (at most) or 2.5 lower than stock on the mains, 2.5 lower on the pilot (at most). This is based on what a few guys in the CO region are setup with on the 701/760 platform.
 
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SMV RYDER

SMV RYDER

Location
Aspen, Colorado
Mobile Chernobyl said:
Did you try stock jetting first?

I've run my ported 760 WFO for 10+ seconds with the same jetting at havasu and ruedi without issues. Is it a bit rich at ruedi? Yea a tad, but I usually only need to compensate with 1/2 turn on the highs and 1/8 or so on the lows.

If you're not having luck with stock jetting and fiddling with the screws, jet down accordingly and I'd guess you'd need 5 (at most) or 2.5 lower than stock on the mains, 2.5 lower on the pilot (at most). This is based on what a few guys in the CO region are setup with on the 701/760 platform.
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I have a huge stumble getting off wfo to getting back on the power. Like she dies. I rebuilt the carbs and changed the pop off spring so we are at 42 lbs. I decided to ride it with the Riva air filter with the new pop spring pressure . It was better but not fixed. The crazy thing is the first time on the water after I bought it and brought it to Rudei it ran perfect! Stock air box though. Re installed the stock air box and now giving her a go tomorrow.
So tomorrow will be the first go with the 127/130 115 pilot and 41 lbs on the pop off. The jetting is what the ski came with used and was sold on the front range.
If I can’t get it right I want to remove the carbs again and at least be closer in jetting then work on screws. I am such a noob at this stuff. It’s extremely frustrating but I know it will be rewarding at the end.
 
kevbo

kevbo

Location
dfw
Higher pop off will make the pilot leaner. You could either install a lighter spring or larger pilot jets. Make sure to set the bottom screw well rich of peak idle rpm.
 
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