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 Bike only runs for a about a minute

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MixieSTX





Bike only runs for a about a minute Empty
PostSubject: Bike only runs for a about a minute   Bike only runs for a about a minute EmptySun Dec 27, 2020 6:50 pm

Bike sat around for 6+ months (Virgin Islands)
- put a new battery, started right away. Rode beautifully for like 5 minutes. Stalled.
- changed the gas, started again right away. Rode beautifully for like 5 minutes. Stalled.
- checked the air filter, looks as good as new
- took the gas tank out, scrubbed the rust out, rinsed with gas
- took the fuel pump out (replaced about 1 year ago), filter looked gunky, soaked it in electric contact cleaner, dried it
--> Same thing: fuel pump primes, starts right away, sounds great, but only idles for like 30 seconds and quits
- if I try right away, runs for only a few seconds
- if I let it sit for an hour or so, runs for about 30 seconds -- less if I rev it up.

I would greatly appreciate any suggestion!
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johnkol





Bike only runs for a about a minute Empty
PostSubject: Re: Bike only runs for a about a minute   Bike only runs for a about a minute EmptySun Dec 27, 2020 8:59 pm

I wouldn't trust a gas tank that has developed rust, no matter how many times you clean it. I would just get a plastic tank, change the fuel filter, and see what happens next.

You say that the engine dies after 30 seconds while it's idling; what happens if it's not idling, that is, start it up and keep the RPMs up a bit.
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MixieSTX





Bike only runs for a about a minute Empty
PostSubject: Re: Bike only runs for a about a minute   Bike only runs for a about a minute EmptyTue Dec 29, 2020 12:51 pm

Increasing the RPM shortens the duration the engine runs to just a few seconds.
Could there be another issue besides the tank and fuel filter (in the pump)?
Thank you!
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johnkol





Bike only runs for a about a minute Empty
PostSubject: Re: Bike only runs for a about a minute   Bike only runs for a about a minute EmptyTue Dec 29, 2020 3:09 pm

If it dies sooner with the RPMs higher, this means that the engine is starved for fuel, most probably an obstruction in the fuel line; this could either be in the pump itself, or the injector, but you should try to clean the entire fuel route starting with the pump and ending with the injector.
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MixieSTX





Bike only runs for a about a minute Empty
PostSubject: Re: Bike only runs for a about a minute   Bike only runs for a about a minute EmptyWed Dec 30, 2020 8:23 am

Thank you, I am ordering a replacement tank, this time in plastic.
Since my fuel pump is new (replaced last year), do you know where I can purchase just the fuel filter (I saw a video showing on to disassemble it)?
How about the injector once I get to it -- block backwards compressed air to clean it?

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johnkol





Bike only runs for a about a minute Empty
PostSubject: Re: Bike only runs for a about a minute   Bike only runs for a about a minute EmptyWed Dec 30, 2020 5:31 pm

I don't know of a place where you could get just the fuel pump filter, but a replacement fuel pump with filter is so inexpensive that you can get it just for the filter and keep the fuel pump as a backup.

Ideally you would clean the fuel injector with a dedicated cleaner, but as a first attempt you can try taking it apart, thoroughly cleaning the screen and the injector with brake cleaner (remove all rubber O-rings before), and seeing if this fixes things.

If there are still problems, run this fuel injector diagnostic test:

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MixieSTX





Bike only runs for a about a minute Empty
PostSubject: Re: Bike only runs for a about a minute   Bike only runs for a about a minute EmptyTue Mar 30, 2021 8:39 am

Wrap-up: I replaced the tank with a plastic model and after a long fight managed to replace the fuel filter inside the fuel pump. The bike now runs perfectly -- I did not have to mess with the injector.
My 2 cents: anyone living close to the sea and not driving the bike for a long while should consider replacing the metal tank with the plastic version.

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johnkol





Bike only runs for a about a minute Empty
PostSubject: Re: Bike only runs for a about a minute   Bike only runs for a about a minute EmptySat Apr 03, 2021 3:06 am

Good job getting the bike to work again, and thanks for providing closure to this issue.
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Bike only runs for a about a minute Empty
PostSubject: Re: Bike only runs for a about a minute   Bike only runs for a about a minute Empty

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