Air Box Removal/ Carb Adjustment

AdamB13 · 08-11-2014, 08:56 PM

I just removed my air box and put on a new filter and crankcase air breather. I took it out for a quick ride and it really bogs down when I start to accelerate past 1/4 throttle.
Any advice is greatly appreciated.
Thanks.

raul10141964 · 08-11-2014, 10:45 PM

install a 140 main jet to compensate for the extra air

Water Warrior 2 · 08-11-2014, 11:11 PM

Sounds like you changed the air/fuel ratio with the new filter set-up.

AdamB13 · 08-12-2014, 07:22 AM

Thanks for the info, I will give that a try.

**jonathan180iq** · 08-12-2014, 09:11 AM

Is this your first carburated vehicle?

With fuel injection, like your car, you can just throw on anything you want and the computer compensates for the air flow. On a mechanical carb, you have to physically adjust the carb to be able to flow the proper amount of fuel for the increased flow.

There are several threads you should read:

http://www.gz250bike.com/forum/showt...hlight=jetting

http://www.gz250bike.com/forum/showt...hlight=jetting

http://www.gz250bike.com/forum/showt...hlight=jetting

http://www.gz250bike.com/forum/showt...hlight=jetting

....THere are tons and tons of other threads if you want to read until your eyes bleed.

For the future note, ANY change to the intake or exhaust is going to require some carb tweaking.

Copeland24 · 12-27-2014, 08:01 PM

What size is the filter you replaced the oem intake assy with?

Copeland24 · 12-27-2014, 08:03 PM

I have found the made by emgo and are sold in sizes 28mm-60mm. I haven't removed my factory air box yet to measure.

08-11-2014, 08:56 PM	#1
AdamB13 Junior Member Join Date: Aug 2014 Posts: 5	Air Box Removal/ Carb Adjustment I just removed my air box and put on a new filter and crankcase air breather. I took it out for a quick ride and it really bogs down when I start to accelerate past 1/4 throttle. Any advice is greatly appreciated. Thanks. Login or Register to Remove Ads
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08-11-2014, 11:11 PM	#3
Water Warrior 2 Senior Member Join Date: Dec 2006 Location: Squamish B.C Canada Posts: 11,409	Sounds like you changed the air/fuel ratio with the new filter set-up. Login or Register to Remove Ads
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08-12-2014, 09:11 AM	#5
jonathan180iq Super Moderator Join Date: Jan 2007 Location: Dalton, GA Posts: 3,996	Is this your first carburated vehicle? With fuel injection, like your car, you can just throw on anything you want and the computer compensates for the air flow. On a mechanical carb, you have to physically adjust the carb to be able to flow the proper amount of fuel for the increased flow. There are several threads you should read: http://www.gz250bike.com/forum/showt...hlight=jetting http://www.gz250bike.com/forum/showt...hlight=jetting http://www.gz250bike.com/forum/showt...hlight=jetting http://www.gz250bike.com/forum/showt...hlight=jetting ....THere are tons and tons of other threads if you want to read until your eyes bleed. For the future note, ANY change to the intake or exhaust is going to require some carb tweaking. Login or Register to Remove Ads
	0

08-11-2014, 10:45 PM	#2
raul10141964 Senior Member Join Date: Apr 2012 Location: Elkhart, Indiana Posts: 369	install a 140 main jet to compensate for the extra air
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08-12-2014, 07:22 AM	#4
AdamB13 Junior Member Join Date: Aug 2014 Posts: 5	Thanks for the info, I will give that a try.
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12-27-2014, 08:01 PM	#6
Copeland24 Junior Member Join Date: Dec 2014 Posts: 2	What size is the filter you replaced the oem intake assy with?
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12-27-2014, 08:03 PM	#7
Copeland24 Junior Member Join Date: Dec 2014 Posts: 2	I have found the made by emgo and are sold in sizes 28mm-60mm. I haven't removed my factory air box yet to measure.
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