ZongshenForum.com
Models => Sportbikes => Topic started by: cyrilghislain on December 22, 2010, 07:41:24 AM
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Hey guys, I just bought a zongshen zs250gs, awesome bike with streetfighter look BUT I have this scorpion aftermarket exhaust that I want to install, the only problem is I know I have to rejet the carb. I have no clue what size is the main jet and pilot jet, should I change both ? only the Main Jet ? Only the Pilot Jet ? And to what size should I change them ? thanks for helping me out.
Cyril GHISLAIN
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Usually it should only be the main jet but the necessity of a jet changes comes when you add more air (ie a conical filter). Its not always necessary if you only put on a different exhaust.
You should try these forums
http://chinariders.net/modules.php?name=Forums&file=viewtopic&t=9198 (http://chinariders.net/modules.php?name=Forums&file=viewtopic&t=9198)
and
http://chinariders.net/modules.php?name=Forums&file=viewtopic&t=9165 (http://chinariders.net/modules.php?name=Forums&file=viewtopic&t=9165)
It talks about the carbs off of the Dual sport Sierra 200GY2. It has pretty much the same carb except for a bore difference (28mm sierra vs 30mm 250gs).
Haven't tried putting in the new jets yet, but for less than 20 bucks for a few jets, I'm gonna try it.
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Usually it should only be the main jet but the necessity of a jet changes comes when you add more air (ie a conical filter). Its not always necessary if you only put on a different exhaust.
You should try these forums
http://chinariders.net/modules.php?name=Forums&file=viewtopic&t=9198 (http://chinariders.net/modules.php?name=Forums&file=viewtopic&t=9198)
and
http://chinariders.net/modules.php?name=Forums&file=viewtopic&t=9165 (http://chinariders.net/modules.php?name=Forums&file=viewtopic&t=9165)
It talks about the carbs off of the Dual sport Sierra 200GY2. It has pretty much the same carb except for a bore difference (28mm sierra vs 30mm 250gs).
Haven't tried putting in the new jets yet, but for less than 20 bucks for a few jets, I'm gonna try it.
Indeed, join us at China Riders! :) I own a Zongshen Sierra 200GY-2 motorcycle, and I am a moderator at the China Riders forums. I maintain a list of maintenance and modification threads for the Zongshen Sierra 200GY-2 motorcycle, located at the following link.
http://chinariders.net/modules.php?name=Forums&file=viewtopic&t=8673 (http://chinariders.net/modules.php?name=Forums&file=viewtopic&t=8673)
The bottom half of your ZS250GS engine is virtually identical to the engine in my 200GY-2 motorcycle. Also, your sportbike’s carburetor is almost identical to the TK MV28 carburetor in my dual sport bike. You can learn a lot about your bike by reading the threads in both our Street, and Dual Sport Forums; we would love to have you join us. :)
Spud :)