engine backfires after shut down

alexn9000 · 07-31-2011, 11:41 AM

Hi there - I'm a new rider and have had my GZ250 for a few weeks now......
For some reason - when I hit the engine kill switch to shut her down - it backfires.
Is this something I need to worry about?
thanks!

geezer · 07-31-2011, 01:02 PM

do a carb clean and adjust your mixture screw down in 1/4 turn increments till it goes away. a ball park for the screw is 2 turns to 1 1/2 turns out

Water Warrior 2 · 07-31-2011, 03:41 PM

The backfire is caused by the lean jetting for the EPA requirements. If that is your only problem don't sweat it. Besides it is a great way to announce your arrival at Star Bucks. The Suzuki S-40(650 single) does the same thing and my friend just smiles and accepts the applause we give her upon a safe arrival.

blaine · 07-31-2011, 04:42 PM

Quote:

Originally Posted by geezer

do a carb clean and adjust your mixture screw down in 1/4 turn increments till it goes away. a ball park for the screw is 2 turns to 1 1/2 turns out

:plus1: Yep!!

geezer · 07-31-2011, 04:50 PM

actually i like ww post better, i retract my advice :lol:

alexn9000 · 08-01-2011, 05:37 PM

awesome - thanks everyone
:2tup:

Rubioj02 · 08-02-2011, 08:24 PM

Does anybody have pics of the mixture screw? I am having the same exact issues with the backfire.

blaine · 08-02-2011, 08:57 PM

Quote:

Originally Posted by Rubioj02

Does anybody have pics of the mixture screw? I am having the same exact issues with the backfire.

This is not the exact carb,but the mixture screw is in the same place.(under the plug between the two screws.

:cool:

07-31-2011, 11:41 AM	#1
alexn9000 Junior Member Join Date: Jul 2011 Location: Earth Posts: 2	engine backfires after shut down Hi there - I'm a new rider and have had my GZ250 for a few weeks now...... For some reason - when I hit the engine kill switch to shut her down - it backfires. Is this something I need to worry about? thanks! Login or Register to Remove Ads
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07-31-2011, 01:02 PM	#2
geezer Senior Member Join Date: Mar 2011 Location: dahlonega GA Posts: 563	Re: engine backfires after shut down do a carb clean and adjust your mixture screw down in 1/4 turn increments till it goes away. a ball park for the screw is 2 turns to 1 1/2 turns out __________________ 99 gz 250 and a currently dismantled fzr 1000
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07-31-2011, 03:41 PM	#3
Water Warrior 2 Senior Member Join Date: Dec 2006 Location: Squamish B.C Canada Posts: 11,409	Re: engine backfires after shut down The backfire is caused by the lean jetting for the EPA requirements. If that is your only problem don't sweat it. Besides it is a great way to announce your arrival at Star Bucks. The Suzuki S-40(650 single) does the same thing and my friend just smiles and accepts the applause we give her upon a safe arrival. Login or Register to Remove Ads
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07-31-2011, 04:50 PM	#5
geezer Senior Member Join Date: Mar 2011 Location: dahlonega GA Posts: 563	Re: engine backfires after shut down actually i like ww post better, i retract my advice :lol: __________________ 99 gz 250 and a currently dismantled fzr 1000 Login or Register to Remove Ads
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08-01-2011, 05:37 PM	#6
alexn9000 Junior Member Join Date: Jul 2011 Location: Earth Posts: 2	Re: engine backfires after shut down awesome - thanks everyone :2tup:
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08-02-2011, 08:24 PM	#7
Rubioj02 Junior Member Join Date: Jun 2011 Location: Midwest City, OK Posts: 9	Re: engine backfires after shut down Does anybody have pics of the mixture screw? I am having the same exact issues with the backfire.
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