Dubach Pipe

[cashjarrmotox]

I have a 2002 YZ426 with a Dubach pipe. Any body have any input as to jetting changes or if they are needed when using this pipe?

[426guy]

no jetting changes needed..(due to the pipe)

[4-stroke_carabao]

I also own a 2002 YZ426F with the Dr. D pipes. Dubach Racing Development indicated that no jetting changes were needed. However, you still need to make appropriate adjustments for your location (ie. temp.,humidity,altitude, etc.). I'm at sea-level with high temps.(80F - 85F) and high humidity, so my bike requires a leaner mixture. Are you experiencing any problems with the pipes installed?

[cashjarrmotox]

I have been riding in 45 degree weather so that may be my problem. My bike has been running rough and seems to have lost some top end???

[kfrosty]

You will need to jet for elements. I just ordered a pipe from Gina yesterday. She informed me that some of their customers found they needed to go with a different needle jet with their pipes. Here's the info she sent me on it.

The jet part number is 5JG-14916-J1

Run it in the #4 position

If you have problems after that, email dubachracing@attbi.com They are extremely good about helping.

[Ga426owner]

Kfrosty, what does the new needle jet give you if you do not have to rejet? Better throttle response?