Carburator rebuild - main jets sizes German version
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Thread: Carburator rebuild - main jets sizes German version

  1. #1

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    Carburator rebuild - main jets sizes German version

    Hello together,

    I would like to ask again wise members of this forum for advice. I separated the carbs and cleaned with ultrasonic.

    I got a carb rebuild kit from All Balls (delivered from USA). My question is about the main jets.

    Alll the jets were in my bird were 145.

    The new ones from All Balls are two times 140 (outer cylinders) and two times 142 (inner) - like I read somewhere in there s forum.

    I start reading, and according to all German specifications 145 is right.

    The first birds delivered to Germany had reduced power to 98 ps. It was due to small rings before the carbs and another ECU.

    I didn't find these ring at my bird and the ECU has following number: 971T

    What do you think? Should reuse the old ones 145 or should I take the 140 and 142 and set the fuel mixture screw to a new position according to the workshop manual?

    Thanks for any advice.
    Best regards
    Miroslav

    Gesendet von meinem Redmi Note 4 mit Tapatalk

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  3. #2

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    Re: Carburator rebuild - main jets sizes German version

    I run 140/142 it runs spot on....

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    Re: Carburator rebuild - main jets sizes German version

    Mine is 140 and 142 and runs fine, bit of a flat spot at 3.5k but that's since the front pipes were replaced.

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    Re: Carburator rebuild - main jets sizes German version

    Can you tell me, what type is yours ECU?

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    Re: Carburator rebuild - main jets sizes German version

    Quote Originally Posted by ziplex View Post
    Mine is 140 and 142 and runs fine, bit of a flat spot at 3.5k but that's since the front pipes were replaced.
    What were the front pipes replaced with ?

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    Re: Carburator rebuild - main jets sizes German version

    Delkelvic by chance?

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    Re: Carburator rebuild - main jets sizes German version

    Quote Originally Posted by Rocketeer View Post
    Delkelvic by chance?
    Yes, that's the one's! I've was advised to move the clip on the needle valve(?) to rectify this which seemed simple enough but I chickened out

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    Re: Carburator rebuild - main jets sizes German version

    How have you assembled the collector pipe ( with the plate in it ) ?

    I can't remember exactly which way around it is but the plate inside can be set horizontal or vertical when assembling.

    One way acts like a carb manifold ( cylinders linked 1-2 and 3-4 )

    The other way acts like an Fi manifold ( cylinders linked 1-4 and 2-3 )

    The Fi manifold way would bring up the mid range and helps to get rid of the flat spot.
    Rocketeer likes this.

  11. #9

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    Re: Carburator rebuild - main jets sizes German version

    Quote Originally Posted by CBRDEAN0 View Post
    How have you assembled the collector pipe ( with the plate in it ) ?

    I can't remember exactly which way around it is but the plate inside can be set horizontal or vertical when assembling.

    One way acts like a carb manifold ( cylinders linked 1-2 and 3-4 )

    The other way acts like an Fi manifold ( cylinders linked 1-4 and 2-3 )

    The Fi manifold way would bring up the mid range and helps to get rid of the flat spot.
    Now you're asking something, I can remember e mailing Delkevic at the time asking if it mattered which way 'round it went being as I read something relating to this shortly after fitting but didn't receive a response. If and it's a big 'if' I remember right I'm thinking vertically which means 1 and 2 are linked...I think.

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    Re: Carburator rebuild - main jets sizes German version

    Quote Originally Posted by ziplex View Post
    Now you're asking something, I can remember e mailing Delkevic at the time asking if it mattered which way 'round it went being as I read something relating to this after fitting but didn't receive a response. If and it's a big 'if' I remember right I'm thinking vertically.
    Do you have a picture of the header pipes and how they route to the collector ?

  13. #11

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    Re: Carburator rebuild - main jets sizes German version

    product79253_1-500x500.jpg
    Quote Originally Posted by CBRDEAN0 View Post
    Do you have a picture of the header pipes and how they route to the collector ?

  14. #12

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    Re: Carburator rebuild - main jets sizes German version

    Quote Originally Posted by ziplex View Post
    Based on that picture - the plate vertical will act like a carb header because 1-2 will be one side and 3-4 will be the other.
    If you put the plate horizontal it will link 1-4 and 2-3 and be like an Fi header.

    I have OEM Fi headers on my carb bike and the flat spot is gone - it also feels smoother - especially when carrying a pillion.
    Last edited by CBRDEAN0; 02-06-2019 at 4:27 PM.

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    Re: Carburator rebuild - main jets sizes German version

    When I dry assembled it IIRC it seemed to only fit together one way and being as the plate is welded I can't see how it could fit the other way around.

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    Re: Carburator rebuild - main jets sizes German version

    Quote Originally Posted by ziplex View Post
    When I dry assembled it IIRC it seemed to only fit together one way and being as the plate is welded I can't see how it could fit the other way around.
    It looks like the whole collector could be turned 90deg

  17. #15

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    Re: Carburator rebuild - main jets sizes German version

    Quote Originally Posted by CBRDEAN0 View Post
    It looks like the whole collector could be turned 90deg
    I assumed there was a slight variation in the angles where the downpipes join but it looks like it's feasible...got me thinking now!


 
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