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General Category >> Rubber Side Down! >> Bike will not go over 35mph
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Message started by GDC on 09/13/19 at 16:41:25

Title: Bike will not go over 35mph
Post by GDC on 09/13/19 at 16:41:25

Got an 02 very cheap. Carb was all jacked up by previous owner trying to rebuild it. Got a used carb on eBay and replaced it. Seemed to run ok but would only run with petcock on prime. Replaced petcock. Now the bike runs good but bike wont go over 35 mph. Tried to adjust the mixture screw and it does nothing. Please help.

Title: Re: Bike will not go over 35mph
Post by batman on 09/13/19 at 17:33:33

What jets are in it?. has it been cleaned? has the spacer mod been done ?- how? what is your elevation above sea level? did you plug the vacuum port for the petcock? You need help -we need info!

Title: Re: Bike will not go over 35mph
Post by GDC on 09/13/19 at 19:17:29

Sea level?? I'm good dude

Title: Re: Bike will not go over 35mph
Post by ohiomoto on 09/13/19 at 20:16:22

Slide is sticking, diaphragm is leaking or someone totally f'ed up the jetting on the used carb you got.

Make sure you have the correct jets and that they are in the correct location. It is common for people to swap the vacuum jets up top with the fuel jets on the bottom. Don't go off doing any tuning until you get it running correctly. Contrary to popular belief, most bikes will run decent enough with stock jetting... almost anywhere in the world. I would start there or close too it.

My money is on the sticky slide/diaphragm leaking or not properly seated. Mine would hardy go over 20 mph when it was sticking.

Title: Re: Bike will not go over 35mph
Post by Eegore on 09/13/19 at 21:29:58

"Sea level?? I'm good dude."

Elevation above sea level changes carb performance.

Title: Re: Bike will not go over 35mph
Post by justin_o_guy2 on 09/13/19 at 21:57:33

Where did you get the Petcock?

Title: Re: Bike will not go over 35mph
Post by GDC on 09/14/19 at 07:28:07

Thanks. Yeah I'm about to take the carb back off and see what the hell. Thanks ohiomoto. The petcock is brand new from suzuki.

Title: Re: Bike will not go over 35mph
Post by zipidachimp on 09/14/19 at 23:36:46

Don't take this the wrong way, but if you got it direct from Suzuki, you've got another vacuum petcock, which is what we've all endeavoured to avoid by using a Raptor manual petcock from Yamaha. Cheers! 8-)

Title: Re: Bike will not go over 35mph
Post by Gary_in_NJ on 09/15/19 at 06:13:40

Do you have an in-line fuel filter?