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BPELFREY

YZ 426 won't start

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I have a 2001 YZ 426 supermoto that will not start. Before I deployed for 3 months it ran fine, but when I came back it doesn't wanna start now. I put premium fuel with stabilfuel before I left so I thought it would be good. This bike has a brand new plug, carbs been cleaned, new air filter. The spark is good, the fuel delivery is good, and the air delivery is good. Any suggestions? I'm thinking maybe something electrical, because I tweaked with the wiring a little bit because it has the baja design street legal kit that wasn't wired properly.

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not sure if this relates to you or not, my friend has a yz450f with a bastardized Baja designs kit on it and his headlight switch doubles as a kill switch. so on his bike if the light is off the bike wont run. just a thought

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I have a 2001 YZ 426 supermoto that will not start. Before I deployed for 3 months it ran fine, but when I came back it doesn't wanna start now. I put premium fuel with stabilfuel before I left so I thought it would be good. This bike has a brand new plug, carbs been cleaned, new air filter. The spark is good, the fuel delivery is good, and the air delivery is good. Any suggestions? I'm thinking maybe something electrical, because I tweaked with the wiring a little bit because it has the baja design street legal kit that wasn't wired properly.

 

Hey Bpelfrey I'm guessing the previous owner was the one who wired it. The dual sport kits sit separate of the remaining electrical of a bike and should not affect how it runs. For a normal Baja Designs dual sport kit that hasn't been modified if the kill wires that plug into the dual sport kit are unplugged there is nothing connecting the kit to the bike which will atleast eliminate the kit.

 

If you have spark, fuel and air and it ran before im wondering if it could be a bad CDI box.

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Go back and clean the pilot jet again.  Could be a layer of varnish in there that you will never be able to see. 

 

http://www.thumpertalk.com/topic/681801-bike-wont-start-dont-know-what-to-do/#entry6879695

 

If it hasn't been tinkered with, the kit shouldn't be a problem, but verify your spark, and if you have any doubts, just disconnect it.

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Not sure what the CDI box is, but my first thought was maybe the valves need adjusted. Should the bike still start with the valves not in the right specs? Thanks

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It ran fine when you left.  Unless somebody rode it while you were gone, why would the valves need adjusting now when they did not back then?

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