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  1. #1

    Antique 750 Carb Rebuild

    After I hit send, I realized this is in the wrong subsection - my appologies

    The time has come to finally do the airbox update and rebuild the carbs on my 1993 SL750. Before I jump in with both feet, I wanted to seek some advice - Since the update is a far less restrictive intake, I am fearful of running lean and all the ills that come with it.

    1) The update kit moves the oil injection check valves to new spacers below the carbs - good idea or use the original check valve location ?
    2) I know the high speed jets need to be changed but the kit specs a 90 for the 750, and a 105 for the 650. Would it be smart to use the 105's to insure it doesn't run lean ?
    3) The original needle/seat is a 1.5 for the '93 and the subsequent years used 2.0 Again, to insure it doesn't run lean, should I increase the size to 2.0 ?
    Many thanks for all the valuable advice on this website.
    Last edited by Poozit; 08-26-2009 at 07:12 AM. Reason: Wrong Forum


  2. #2
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Quote Originally Posted by Poozit View Post
    After I hit send, I realized this is in the wrong subsection - my appologies

    The time has come to finally do the airbox update and rebuild the carbs on my 1993 SL750. Before I jump in with both feet, I wanted to seek some advice - Since the update is a far less restrictive intake, I am fearful of running lean and all the ills that come with it.

    1) The update kit moves the oil injection check valves to new spacers below the carbs - good idea or use the original check valve location ? New location will be fine.
    2) I know the high speed jets need to be changed but the kit specs a 90 for the 750, and a 105 for the 650. Would it be smart to use the 105's to insure it doesn't run lean ? Going from 77.5 to 90 is a big jump, and should do it, but get a set of 95 just in case you need more. I'd try the 90s first though.
    3) The original needle/seat is a 1.5 for the '93 and the subsequent years used 2.0 Again, to insure it doesn't run lean, should I increase the size to 2.0 ? Going to the 2.0 will drop your pop off pressure some (using the same springs), but may be a good thing as the vacuum signal will be less with a less restrictive F/A.
    Many thanks for all the valuable advice on this website.
    Lets see what others say.
    Can ya scan and post those instructions that came with the kit?

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