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Trey
Glenburn, ME

Trey has no Avatar

USA
5 Posts
Topic started on 08/12/2009 at 6:45:46 PM  Member Profile  Reply with Quote
My 2006 DRZ 400S (1900 miles) starts fine with the choke on, however it’s backfiring (A-Lot with the choke on)and when I push the choke in it stops running.
This bike has a Dynojet spring and needle, and FMF exhaust.
The bike has been backfiring for the last 2 years, but only when I let off the gas / slow down. (only one little pop)
The bike has not ran much this year and sat still for around 3 or 4 weeks.
what do you think I need to do?
Clean the carb?
Add the jets from the Dyno kit? (if so what one?)
Adjust the air flow? (is so how much?)
Cut a hole in my air box? (if so how big? 3"x3" ?)

I'm not a bike mechanic so please speak english.
However, I’m very mechanically inclined.

Cheers!
2006 DRZ400S

rogersj
Twillingate, Nfd

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Canada
854 Posts
Posted on 08/13/2009 at 1:32:00 PM  Member Profile  Visit rogersj's Homepage  Click to see rogersj's MSN Messenger address  Reply with Quote
my dr 650 pops all the time on deceleration im guessing it could be a lean spot although the plug looks fine
2007 DR650SE - K&N air filter air box mod, Dynojet kit, DRZ 250 tail light, and supertrapp racing series slip-on exhaust.

HorseRider650
Ohio

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USA
553 Posts
Posted on 08/13/2009 at 2:37:07 PM  Member Profile  Reply with Quote
If I got what you said right "starts fine with the choke on" and "when I push the choke in it stops running" your carbs needs cleaning. Pay attention to the pilot jet.

I have a XR650L that used to backfire on deceleration a lot till I removed the smog pump. No more obnoxious backfiring.
08 XR650l - Big Red Elephant
10 KTM300XC-W - Just Orange
09 KX85 - Son's MX ride (AKA: The Weed Wacker)
07 CRF80 -Son's trail ride.
08 XT250 - lil_mynx

Jeff_in_rc
Ridgecrest, CA

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USA
167 Posts
Posted on 08/18/2009 at 12:15:59 PM  Member Profile  Reply with Quote
+1 to what HorseRider said, you have a plugged up pilot jet. Pull the carb and give it a good cleaning and be sure to use compressed air to blow out all of the passages but DON'T loose the little o-ring at the top of the carb.
2004 Suzuki DRZ 400 S

SPower
California

SPower has no Avatar

USA
2 Posts
Posted on 04/28/2010 at 08:46:52 AM  Member Profile  Reply with Quote
Does anybody have or know where I can get step by step instructions on cleaning the carb? I am pretty sure that is what is needed on a bike I am buying, guy let it sit with gas in it, will only idle with the choke on half way.
It is an 06 DRZ400S.

Thanks!
2006 DRZ400S

Jeff_in_rc
Ridgecrest, CA

Jeff_in_rc's Avatar

USA
167 Posts
Posted on 04/28/2010 at 10:34:41 AM  Member Profile  Reply with Quote
Either the shop manual or the Clymer manual should give you that info.
2004 Suzuki DRZ 400 S
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