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Pilot mixture screw adjustment - can it be performed while on the bike?

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  • Bmblank
    commented on 's reply
    Just curious, where did you get the recommended sizing for your jets? I think I’m in a similar situation with my 2001 road star 1600. Cobra long tube exhaust and a RK-3905-1 K&N full circumference intake. Seems a bit lean with just the exhaust (backfiring on decel, could be AIS as that is still hooked up?) and was un-ridable with the K&N intake. Couldn’t get above a certain rpm without choking out so I put the stock back on for now. I haven’t pulled apart the carb yet so don’t know the sizes yet but I assume they are original. Was it a member or a website that you got the recommendation from? Are larger jets necessary or can I just fatten up the fuel/air with PMS adjustment?
    Thanks, Bryan

  • SbTx_Rider
    commented on 's reply
    Generally all exhaust backfires are caused by exhaust leaks and the AIS system. Is your AIS still on your bike? If so, search the site, plenty of threads on how to delete the AIS system.. I think it might even be under tech articles. Also, make sure exhaust ports are good and any exhaust pipe joint is sealed. Fresh air enters the exhaust and causes the unburnt gas to ignite, causing the backfire.

  • EasyTargetRN
    replied
    Originally posted by brianmac View Post
    if there is a screw in the hole, Its probably PMS,FUZZY PIC, idle mixture screw. in GENTLY for leaner, out for richer, at low RPM mostly. ADUSTING THE PMS , often REUIRES a corresponding idle speed adjustment. do it when ENGINE HOT .
    is your screeen name in reference to the RNs that were charged criminally for making OTJ mistakes. ???
    If you're referring to me, no, that's a "gamer name" my kids gave me a loooong time ago...I once tried to play Gears of War with them...I never made it that far before being dropped hence the name EasyTarget, RN is what I've been for 30 years.

    Leave a comment:


  • Kevin Di
    replied
    Yes I did jump into RM post only because you guys were on that topic. The issue I’m having with my bike is I release the throttle and I’m getting some backfiring through the exhaust as I’m cruising down the road… Thank you Guys I will keep you posted on how I make out.

    Leave a comment:


  • Duke
    commented on 's reply
    Yes, that's your PMS. Start with 2 1/2 turns out, then turn to find the highest idle, then 1/8 of a turn out. It's set.

  • brianmac
    replied
    if there is a screw in the hole, Its probably PMS,FUZZY PIC, idle mixture screw. in GENTLY for leaner, out for richer, at low RPM mostly. ADUSTING THE PMS , often REUIRES a corresponding idle speed adjustment. do it when ENGINE HOT .
    is your screeen name in reference to the RNs that were charged criminally for making OTJ mistakes. ???

    Leave a comment:


  • Kevin Di
    replied
    Since you are all on this topic I’m unsure if this is my PMS… ?

    Leave a comment:


  • EasyTargetRN
    replied
    Took everything apart, bowl gasket may have slipped, and float needle seemed sticky. Everything back together and no leaks
    huzzah! Click image for larger version

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    thanks all for the wisdom
    Attached Files

    Leave a comment:


  • Shores
    commented on 's reply
    Tap the float bowl with a screwdriver while it's running to see if you can release the float. It might be stuck down.

  • EasyTargetRN
    replied
    Everything back together, started w/o pulling the enricher. Idled at about 900, responded well to throttle. Shut her off after idling for 5 minutes and went to install the airbox and gas is leaking from the bottom of the carb.
    Double checked all the screws before installing…
    argh

    Leave a comment:


  • Shotround
    replied
    I believe the recommendation is to also remove the inlet filter.

    Leave a comment:


  • DEEPHATE
    commented on 's reply
    That's what I did, runs great.

  • EasyTargetRN
    replied
    Click image for larger version

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ID:	142811 Finally had time to work on the R*. Carb disassembled, cleaned, and recommended jets installed. Plugs changed. Before I reinstall the carb is the pilot mixture screw @1200 in the picture? Seat then 2.5 turns out?
    thanks

    Leave a comment:


  • Shotround
    commented on 's reply
    what about the rc-850 and rc-860. flange inside diameter is 62mm. the ra-068v has a flange inside diameter of 65mm. also, flange length is shorter at 16mm vs 22mm.

    RC-0850 2.438 in (62 mm) 2 in (51 mm) 5.125 in (130 mm)
    RC-0860 2.438 in (62 mm) 3 in (76 mm) 5.125 in (130 mm)

    it's probably going to be a tight fit at the flange.

  • EasyTargetRN
    replied
    nvmd, AKA accelerator pump cover...

    Leave a comment:


  • EasyTargetRN
    replied
    Enricher cover? Guess I'll need to search for that once I pull the carb. Where did you get the star cover?

    Leave a comment:


  • Sharpman66
    replied
    Click image for larger version

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ID:	142425 While you have the carb out check the condition of the enricher cover. If it's cracked it should be replaced with an aluminum one.

    Leave a comment:


  • Shotround
    commented on 's reply
    they're no longer listed on the kn site anymore. im hoping they'll bring something back when things settle down.

  • Dr. D
    commented on 's reply
    Here's another to add to your list Shores: I haven't been able to source an 066V or 067V anywhere.
    RA-068V - round, 0.813" offset, 4" deep, 6" diameter. $59.00 from K&N.

    I have this filter. It sticks out about as far as the factory box. If you're tall (I am 6'2" and relocated the floorboards 3" forward), it won't interfere with your knee.

  • EasyTargetRN
    replied
    Thanks davej the tech article on the forum is an excellent resource as well.

    Leave a comment:

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