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Thread: Standard main jet for 04 1200C (rubber mount)

  1. #11
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    Re: Standard main jet for 04 1200C (rubber mount)

    You seem to be hung up on the main jet but where you're describing the pinking occurring is not yet fully on the main jet. Try a 45 pilot and/or shimming the needle ...
    Last edited by Fast Lane; 07-10-2019 at 06:12 AM.

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    Re: Standard main jet for 04 1200C (rubber mount)

    Any news on this yet?

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    Re: Standard main jet for 04 1200C (rubber mount)

    Quote Originally Posted by harley506d View Post
    Any news on this yet?
    Sorry,
    I've been away for a couple of weeks.
    The 180 and 185 jets arrived while I was away, but I've not had time to look at the bike yet.
    It may be a while now, winter draws on (literally, I had to dig out the long underwear for a ride today ) so I've dragged my old Transalp out from it's summer hibernation.
    I'll get around to looking at the Sportster as part of her winter service, but it may be a while now before I get her out for a decent long run to see if there's any improvement, particularly as the problem occurs most often on hot days !
    Thanks for all the input, and I will come back with an update once the problem is solved,,,,,,,,, eventually.
    If speed kills,,,,,,,,,,,,,,,, buy a 2CV and live for ever

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    Re: Standard main jet for 04 1200C (rubber mount)

    Did you check what number was on the control box under the seat? I still think that it's the culprit. Take it off to a dealer and get them to check what build it is.
    Can't really see it being the main jet, although a bigger jet may mask it.
    I would change pilot and needle if not already done rather than main.
    Detonation will destroy your motor.

    Good luck with it.

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    Re: Standard main jet for 04 1200C (rubber mount)

    "Did you check what number was on the control box under the seat?"

    Not yet no, but it's on the list of jobs to look at over the winter.
    If speed kills,,,,,,,,,,,,,,,, buy a 2CV and live for ever

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    Re: Standard main jet for 04 1200C (rubber mount)

    Just for your info i recently did my 2005 XL1200R as like you i'd had my sporty years and never got around to fully sorting her out. this year i needed her to tour England so spent time getting her right.
    Long story short.. i have pretty much open pipes Cobra 3" constant velocity slip ons with a screming eagle backing plate and K&N filter.
    I run a 45 and 190 with a dyno jet kit. Runs fine but is slightly over rich. I get around 110 mls per tank. 12.5 liters /2.75 uk gallons. As i said just info as your set up is different.
    As an aside while i was pissing about trying to tune my carb i stripped down my m8's 883 to see how his carb was set up. And his hadn't had the slide air hole drilled as per DynoJets instructions but is quite happy with how it runs (not well in my opinion).
    Just saying to double check everything when your in there.
    If its fuel check the plugs light grey clean looking plugs no good on carbed bikes must be brown tips and electrode any white/grey is bad. Fuel injected bikes run a leaner engine with cleaner plugs when in tune.
    Last edited by howo; 16-11-2019 at 02:13 PM.
    OMG it started !!!!!

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