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  1. #1
    bex's Avatar
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    Carb Cover Screws

    Was researching how to rejet my carbs on the 1200R and disable the accel pump and came across Osides post. I saw alot of genius there and was looking to follow suit and upgrade my screw hardware from the phillips style + screw heads to the hex heads for more durability.

    I stole and annotated one of the pics to show exactly what I want to find. What are the dimensions of the stainless lock washer and the hex head screws/bolts that hold the caps on the carbs. Would like to replace them all with the upgraded parts as these tend to get stuck after a while and round out.

    Regards
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  2. #2
    Moderator OsideBill's Avatar
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    Sorry Bex I have been away on Vacation, still am but had a chance to check in today. Those are 5mm-0.8 pitch x 12mm long, I use a lock washer underneath. The I-body fuel pump side is 5mm-0.8 pitch x 35 long, I use a flat and lock washer on it. On the older SBN the fuel pump is 5mm-0.8 pitch x 30mm long with flat and lock washer. I buy them from McMaster in quantity.

  3. #3
    1131 Adam E.'s Avatar
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    Quote Originally Posted by OsideBill View Post
    Sorry Bex I have been away on Vacation, still am but had a chance to check in today. Those are 5mm-0.8 pitch x 12mm long, I use a lock washer underneath. The I-body fuel pump side is 5mm-0.8 pitch x 35 long, I use a flat and lock washer on it. On the older SBN the fuel pump is 5mm-0.8 pitch x 30mm long with flat and lock washer. I buy them from McMaster in quantity.
    Bill,

    When you say old SBN how can you tell if its the older style? The carbs in question for me are from a GP1200.

  4. #4
    Stop staring at my tits NJJer's Avatar
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    Quote Originally Posted by Adam E. View Post
    Bill,

    When you say old SBN how can you tell if its the older style? The carbs in question for me are from a GP1200.
    I "think" the old ones are round body carbs.

    Anyone confirm?

  5. #5
    Moderator OsideBill's Avatar
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    The old ones I mention are the SBN 44's like used on the GP1200 The round bodies I would classify as antiques or BN's

    McMaster site is too simple pick the screw head style, then metric, then thread size, then length, then material (Stainless 18-8 )

  6. #6
    Stop staring at my tits NJJer's Avatar
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    The Carb Master has spoken.

  7. #7
    1131 Adam E.'s Avatar
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    Quote Originally Posted by OsideBill View Post
    The old ones I mention are the SBN 44's like used on the GP1200 The round bodies I would classify as antiques or BN's

    McMaster site is too simple pick the screw head style, then metric, then thread size, then length, then material (Stainless 18-8 )
    Thanks Bill. Any other carb improvements, tricks that you have for the old SBN 44?

    Adam

  8. #8
    Moderator OsideBill's Avatar
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    Quote Originally Posted by Adam E. View Post
    Thanks Bill. Any other carb improvements, tricks that you have for the old SBN 44?

    Adam
    I drill the returns out and add a restrictor jet to balance pressure.

  9. #9
    Stop staring at my tits NJJer's Avatar
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    Quote Originally Posted by OsideBill View Post
    I drill the returns out and add a restrictor jet to balance pressure.
    Bill, I see and hear of people doing this all the time. One thing I was wondering about, how do we know the pressure is not balanced before we start drilling? Is there a way to test this?

    Thanks

  10. #10
    Moderator OsideBill's Avatar
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    Quote Originally Posted by NJJer View Post
    Bill, I see and hear of people doing this all the time. One thing I was wondering about, how do we know the pressure is not balanced before we start drilling? Is there a way to test this?

    Thanks
    That is the issue, there really is no way to test this. I am not sure who invented this mod, but it is a standard mod on all Novi's. This works for duals and triples. I believe it also helps the check valve life in the fuel pump. One thing I can say is if one pump starts to fail the others assist in maintaining fuel flow, I had a set of triple novi 48's come in with only one pump working and it was enough keep the ski running.

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