Yep, another jetting thread... sorry!

I have a TM34 that I pulled out of the box to install that I picked up used here on the forum a few months ago. With Winter coming, I was in no hurry to go through the all-day job of playing jetting games with it. Now I'm in the mood. But... where to start? I bought a bunch of jets for it so I need to find the best starting point for fine-tuning with my Wideband O2 sensor.

351 with KLX300 pipe/muffler, Twin Air filter, KDX snorkel, at sea level.

What's everybody else running who has a BB TM34 and 351?

This is my current jetting on my stock carb:

Keihen 135 Main Jet (DJ126)
Needle in 4th Clip from Top plus one Shim
35 Pilot

It's just about dead-on perfect with the above setup.

Thanks!

Rob


Edit:

Here's what was in the carb when I got it: Main Jet 142.5, 40 Pilot, Needle on middle clip with a nylon spacer under. The jets I have for it are 130, 135, 140, 145, and a 37.5 pilot.

 

Nothing??

 

Uhh i have no clue haha but i'm in the same spot your are. at sea level, got a full muzzy pipe, 351cc, KDX snorkel, airbox mesh netting removed, iridium spark, k&n.. SO yup.. no answer, but i support this thread!

 

Do you have the TM34 too or are you still running the stock carb, because I can help with the stock one. That was two full days of testing/rejetting with my wideband O2 sensor to get it right.

Rob

 

Rob, can you use the spreadsheet as a starting point?

https://docs.google.com/spreadsheet/...=sharing#gid=0

 

Ohhhhh!!! I forgot all about that spreadsheet! Yes, perfect, thanks!

Edit: Spoke too soon. Crap, only two TM34's listed, and one doesn't have jetting details. Well, at least one does (but he's at 3300'). Still, it kinda confirms what I was going to start with if I couldn't find anything better.

I'm going to start with a 135 main, 37.5 pilot and leave the needle at middle notch plus spacer. I don't have a smaller pilot jet.

Rob

 

Not sure if this will help you or not, but I have a '06 with a tm34 and BB 351 kit, full muzzy with a KDX snorkel. I'm running a 40 pilot and a 145 main at sea level. Seems to be spot on for me.

I'd "fatten" up that 135 number - error on the side of rich.....

 

Thanks Doc!! Your numbers sound really good. I think I'll go with yours to start, either with a 140 or the 142.5 that came in nit.

Rob

 

So glad i saw your post

I just bought an 06 klx250 and it has a TM33 and it sputtered at 1/2 to WOT so i am re-jetting with 142

Question is when do you know its too much and whats the symptoms

Is plug too rich

Thanks

 

Not sure if my numbers will help either but...
09 q4, stock header, kdx snorkel. 6200'. I have 142.5 and 40. Ran great at sea level as well with just a turn on mixture screw. Valves and re sprung suspension, love the bike now!