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Oct 15th 2016, 09:32 AM   #1
 
  Jan 2016
  North Idaho

2000 DRZ 400 E carb help

The new to me DRZ has a bad bog/backfire off idle. I was told the carb was jetted, at this point I do not believe this to be true. I pulled the carb off the morning and popped out the accel pump diaphragm ( looks like it needs a replacement ) and the tps sensor was barely attached, like finger tight.

I know we have some DRZ guys on here and I am asking for advice, what should I do carb wise since it is currently off the bike.


2000 drz400E I will be plating it soon but it will be for a round town and trail rides

Here is a shot of the diaphragm


I got the fat man spring on it yesterday, she looks pretty damn good for a old trail bike.



Oct 15th 2016, 04:23 PM   #2
 PeteN95's Avatar
Moderator
 
  Jan 2016
  Muklilteo, WA

  Suzuki DL1000, Honda XR650R, KTM 250 XC-W
Have you adjusted the idle mixture screw to get the highest rpm? Do this first before changing anything else. Did the accelerator pump squirt fuel when you opened the throttle?
Oct 15th 2016, 04:33 PM   #3
 
  Jan 2016
  North Idaho

Yes on the fuel squirt, didn't check the idle mix screw. As expected the carb is pretty dirty so I will be giving it a good cleaning and "since it is out" jetting it with the JD jet kit.


I also did the "Eddie mod" that seemed to increase the squirt pressure and shorten the duration.


Upon research seems the TPS is not much use and shouldn't have made any difference so I just tightened it up.
Oct 19th 2016, 09:06 AM   #4
DGA
 DGA's Avatar
Moderator
 
  Jan 2016
  PDX

  An Ape and a Husky
Your accelerator pump diaphragm (fix it though) and your TPS are not the issue. Dirty carb and jetting are the culprits. Clean it, get your pilot jet sized so it idles and starts easily with about 1.5-2 turns of the fuel needle out.
Oct 19th 2016, 09:55 AM   #5
 
  Jan 2016
  North Idaho

Thanks, I got the JD kit today, will be doing a nice cleaning on it this weekend.
Oct 19th 2016, 11:15 AM   #6
 
  Jan 2016
  North Idaho

So the kit comes with a red and blue needle, I am planing on the blue needle 4th clip, Spokane is about 1800 ft and Rathdrum is about 2200 ft altitude.

The bike has the snorkel removed from the airbox and the outlet of the spark arrestor enlarged ( the arrestor is still in place), also looks like the previous owner drilled some holes into the internal baffle.

The kit says use the 162 main jet for a stock bike and 165main jet for opened up intake and airbox mods.

So I am planning on the 165 jet.


I am a bit confused as the red needle is for high temp and high altitude
blue needle is low altitude and cool temps

Maybe I am over thinking it
Oct 19th 2016, 02:20 PM   #7
 
  Jan 2016
  North Idaho

So today is work from home Wednesday and it is slow at work so I was messing with the carb. everything was fine until I went to replace the pilot air jet


Left is what was in the bike, right is the new JD kit part



looks like that is for a fcr 39 MX carb and not my older non mx fcr 39

Edited by groverdill on Oct 19th 2016 at 04:15 PM
Oct 21st 2016, 09:24 AM   #8
 PeteN95's Avatar
Moderator
 
  Jan 2016
  Muklilteo, WA

  Suzuki DL1000, Honda XR650R, KTM 250 XC-W
That is a fuel jet, not air. Those holes in the side are air bleeds.

Edited by PeteN95 on Oct 21st 2016 at 09:27 AM
Oct 21st 2016, 10:20 AM   #9
 
  Jan 2016
  North Idaho

When looking I found this
Hanging idle on a DRZ400E...pilot jet help - Intake - Jetting / Fuel Injection - ThumperTalk


I just cleaned the stock one and stuck it back in.
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