670

[98670X]

hey all ,98 summitx 670 , no dpm with mixed 50:1 gas. i got 340/350 jets noticed it was boggin when climbin the other day. the temp was +2 at 6500-7000 ft. anyone have a suggestion .... bigger/smaller jet size? stock sled and pipe, whats people run at this temp ?

 

[magnet]

why did you remove the dpm? my 99 is running the same for jets @ 4000 ft have never had any issues. but my dpm still hooked up. oil to gas could probably be leaned out to 40:1 and still be very safe. could maybe drop one size jets and see how that works.

 

[OverBore]

why did you remove the dpm? my 99 is running the same for jets @ 4000 ft have never had any issues. but my dpm still hooked up. oil to gas could probably be leaned out to 40:1 and still be very safe. could maybe drop one size jets and see how that works.

When you change gasil mixture from 50:1 to 40:1 you are not leaning it out.

 

[magnet]

When you change gasil mixture from 50:1 to 40:1 you are not leaning it out.

oh yeah sorry i was backwards. 50 is pretty lean on the oil.

 

[98670X]

the dpm was removed before i got the sled , there are no guages no wireing harness no headlight , someone wanted a light sled. they droped and rolled the 136 with new track.
So magnet your running the same at 4000 , so i should jet up for 6000-7000??

 

[Modman]

the dpm was removed before i got the sled , there are no guages no wireing harness no headlight , someone wanted a light sled. they droped and rolled the 136 with new track.
So magnet your running the same at 4000 , so i should jet up for 6000-7000??

No if you are bogging you want to jet down. I would think you could be around 320's or 310's at that elevation, so you would be using a smaller jet. Read plugs to determine correct jetting, but +2 at that elevation with stock pipe would be rich for sure. I ran 340's with twin pipes at that elevation and I was rich. Now I have to run 550's, which is a big jet for my 440cc motor.