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I have decided to have my carbs re-built to perform at HIGH altitudes (between 9,000 and 13,300 ft.). I know that the 140 main jets are for lower elevations and 125 main jets are recommended for 5,500ft. and up. But what about the 115 main jets? Would they be even better for super high terrain? Also, how should I adjusting the mixture? Rich or lean? Any other high altitude carb/ignition hints? Seriously though, 9,000 ft. is as LOW as they will ever be driven.

Thanks guys!

I'm a bit lower than you here. Mine get's driven in 7k-10k mostly. I went with the 125's and it seems to like them. When tuning the carbs I found that 1.5 turns out runs best. Dennis confirmed this would be about right at my altitude. I recall also being told to advance the timing just a couple degrees as altitude delays combustion. I have my timing set right at factory spec, however; and it seems to like it.

I can remember my '03 Rubicon gasping at the top of Imogene. I can't imagine a Pinzie up there!

I can remember my '03 Rubicon gasping at the top of Imogene. I can't imagine a Pinzie up there!

I was at the RMP Treffen in '05 with a couple others of us from AZ. We did Imogene Pass along with a couple other passes and the trucks ran fine. My pinz resides at just over 1,000 ft and it had no major issues with the elevation. I had to pull out the t-throttle a bit so it ran at 1100 rpms and it performed very well. This past year at Cripple creek where we camped at just under 10,000 ft I noticed some performance loss but did not set the t-throttle as I had in the past.

mjnims wrote:

I can remember my '03 Rubicon gasping at the top of Imogene. I can't imagine a Pinzie up there!

I was at the RMP Treffen in '05 with a couple others of us from AZ. We did Imogene Pass along with a couple other passes and the trucks ran fine. My pinz resides at just over 1,000 ft and it had no major issues with the elevation. I had to pull out the t-throttle a bit so it ran at 1100 rpms and it performed very well. This past year at Cripple creek where we camped at just under 10,000 ft I noticed some performance loss but did not set the t-throttle as I had in the past.

I understand that the t-throttle should never be used to control the idle speed. Same with the choke. Both knobs should be pushed all the way in (closed) before it is driven.

Actually you can use the choke at the "half-choke" position per the manual until it warms up.

The "T-Throttle" is just a hand throttle and uses the same linkage as the accelerator pedal. I don't see how it could hurt to use it to raise idle speed for a while. Obviously it's meant to be used while the vehicle is being operated. Granted the best thing would be to adjust the carbs properly in the first place.

I've used hand throttles for years in low geared Jeeps to avoid "accelerator hop" going over obstacles. Haven't really used it on the Pinz. It doesn't seem to hold very well. I'm afraid to turn it tighter for fear I'll snap off the "T" and it will be locked on. Just another little thing on the list to look at.

I'm dying to get the Pinz down to Ouray sometime. That was one of the greatest trips I've ever had anywhere. Just not sure I want to drive the Pinz that far again.

The hand throttle can be used at any time to control engine speed, it hurts nothing.

Jim LaGuardia wrote:The hand throttle can be used at any time to control engine speed, it hurts nothing.

Yes Jim, the hand throttle can be used at any time to control engine speed (just like the gas pedal) but in the manual it states the the hand throttle should never be used to "set" the idle speed. The idle speed needs to be set on the carbs, No? Also, it states that you should never DRIVE the truck when the choke is on at all. That's what I meant when I stated that BOTH the throttle and choke knobs should be pushed all the way IN before DRIVING the truck.
It seems that some here think that it's fine to drive around with the choke out and using the hand throttle to set their idle. This will lead to bad gas mileage and fouled spark plugs.

Use common sense when reading manuals, literal translations can be decieving. At altitude you may have to set the idle up due to less 02.
The hand throttle alone will not foul plugs, and makes a good cruise control on long straight roads as long as you have a hand to release it when necessary