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Thread: Fuel additives

  1. #1
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    Fuel additives

    My bike has been stood for a good while due to circumstances and i recently tried firing it up - last week. It almost started but flattened the battery before it caught. The fuel is a good 6/8 months old. Im going to top up the 1/4 tank i have with fresh fuel and try again but am concerned the carb - a Mikuni HSR42 - may be gummed. I have read about fuel additives such as seafoam - is this a worthwhile investment? Or do i just start it and blast it on the road to clear any crap that may have accumulated? The batterys good according to my multimeter AND it turns the engine well which brings me back to fuel. Any advice or reccos apprecited. The bike is a 92 softail. its sparking well.
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  2. #2
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    Re: Fuel additives

    Fresh petrol will help lots

    Try removing the air cleaner and giving it a shot of easy start. Once it starts running that should be enough hopefully
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  3. #3
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    Re: Fuel additives

    Always used to drain fuel when stored bike but still had teething problems. Used Motrax fuel additive and the bike started off the button first time.

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  4. #4
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    Re: Fuel additives

    Just pop the bowl off of the Mikuni, 4 screws and it's done. The main jet, pilot jet and accelerator pump nozzle are all easily accessible from there. If you hold them up to the light you'll see any blockages ...
    Last edited by Fast Lane; 23-05-2018 at 10:09 PM.

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  5. #5
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    Re: Fuel additives

    Ayup Tone, Softail batteries ain't very big, so if you give the bike a jump start from another vehicle it will help a lot. The donor vehicle must NOT have it's engine running, as your bike's reg/rec can't handle it & will most likely pop. FWIW, one o my bikes has been standing for a few years now. I tried starting it up last year, went third press of the starter. Draining the tank & putting fresh gas in will do no harm. My Softy has also been standing for 6 months & it too fired up quite easily with no feckin' about with owt. HTH. BTW, I did the friend thing.

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  6. #6
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    Re: Fuel additives

    Thanks for the feedback all - will try again this weekend!
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  7. #7
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    Re: Fuel additives

    Water separation in the carb float bowl is a problem. Try and start and the motor gets a slug of water rather than fuel so wets the plugs. You need to get fresh fuel in the bowl and dry the plugs.
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  8. #8
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    Re: Fuel additives

    All sorted. Checked the carb - it was fine - put in some new fuel, recharged the battery, and away she went!
    Last edited by Realbark; 14-06-2018 at 08:02 AM.
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  9. #9
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    Re: Fuel additives

    Interesting read, my Softail has been off the road a while, and considered some sort of fuel additive,
    but just been using standard octane fuel, and it's running well.
    Any thoughts on fuel additives folks?
    thanks,
    Andy

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  10. #10
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    Re: Fuel additives

    I've all-ways adopted the idea of trying to fill up with 'super' unleaded before laying up my bikes for any amount of time. Its worked for me.
    Sussex Coaster

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