125-200cc Wb165 Jetting, Exhaust, Engine Setup

Walt,

The pilot makes sense but the clip position and main seem awfully rich for such high elevation, is the gas your running oxygenated or does the 165 just like fuel? If you need to be that rich between 4 and 8000, I wonder what I will need for the high comp 165 between 1 and 4000?

Nate

Nate,

That is actually the same jetting as I was running in my high comp 144. The RB Designs work let me reduce my main and my needle versus before. My other stock tmxx was running a 16-61 in the 4th and a 480 main with the 165. Really dry air of about 15% humidity kind of makes up for some of the altitude. Also my pipe isn't the best as it is a frankenstein gobbled together out of a bunch of parts. Out of FMF Fatty's and I am sure that it will be a month or more before I have an extra sitting here to bolt on. Just want to keep the kit buyers in pipes for right now.

I don't know if you can tell but I was very pleased with the results from the RB Design mods. Bottom end/early mid response is equal or better than the PWK airstriker and top end is better although I am not there very much. I also didn't have to do any monkeying around to keep it running well with the elevation change. With the stock 125 pipe this motor screams with this carb. It was pulling hard all the way to near 12K. Definitely a little short on bottom/mid but revs out better than any of the pwk motors I have ridden. You should try yours with the stock pipe and the 165 before you mount up the fatty just for a comparison.

One other thing I didn't have to make any jetting changes with the 165 going to sea level with the PWK airstriker and would expect the same with the RB tmxx carb.

Walt, nice to hear you finally got the new bike out. It will be intersting to see how you make out with the clutch. What knid of auto clutch have you been using on the 165s?

New Bike ! Walt your full a surprises.....

Steve,

I was running the EFM auto clutch, just works effortlessly and forever. Thought I would try the new core exp with the new left hand rear brake set up. My 09 is now a 144 and used for a saw bike. If I can't get the exp to handle the larger torque I will just swap it into the saw bike and install the efm in the '12. Of course if I can ever get ahead on the 165 kits then the 144 will become one.

Kevin,

Bill made me a deal I couldn't refuse and so my WR360 is onto a new life with hopefully a new owner that appreciates its fine qualities.

Walt , you are living the dream.

Actually I am dreaming of having a life.

2009 WB165

Carb = TMXX 38
Pipe & Silencer = 200SX FMF Fatty / TurbineCore 2
Other engine mods = 0.7 Base Gasket, PowerNow divider, iBooster
Premix ratio & fuel type = Amsoil Dominator 44:1, Sunoco Supreme 112 Leaded
Gearing = 13/50
Temperature range (deg F) = ~80F, humid
Elevation (feet) = ~500 - 1000ft
Main jet = 470
Pilot jet = 30
Needle = 6CHY17-62
Clip position = 3
Air screw setting = 1.5
Slide = 5.0
Plug = BR9EIX gapped to 0.023

Conclusions/Results: Awesome

2012 CR165

RB carb mods, the works
Main- 450
Pilot- 50
BFY-43-74 #3
2.5 air screw
25% race gas/pump mix
50-1 Amsoil dominator
stock pipe, Leo Vince silencer

I had no luck with the Suzuki needle, it was way to fat on the bottom and I could not get it to run clean. The settings above are almost perfect for me but once in a while I will get that "yang, yang yang" when going from full throttle operation to slowing down and down shifting.

hi tnttimber,

I've created a true 2T jetting database in Google Documents, and made it publicly available and editable.

Here's a link to that post from MattR:

http://www.cafehusky.com/threads/2-stroke-jetting-databases.23314/#post-244479

Think you'd be willing to be the first victim user of it?

Try entering your info at the bottom, and then filter the bike size and carb columns to see other people with your similar setup. I'm still working on making a "how to guide" built into it.

thanks!
- dan

Done. Line 31. Cool database Dan.