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Thread: Stupid RF900 Mikuni Downdraught carbs - require expert advice

  1. #31
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    See if they do an equivalent slider for a Honda. It's more likely to be engineered to last the distance.

    These Suzuki things just aren't built for the Melling lights.
    Some things are worth dying for, living is one of them.

  2. #32
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    Quote Originally Posted by crazybigal View Post
    and if you wanted to try another carb, Keihin fit. their 39mm one should work.
    http://www.trademe.co.nz/Trade-Me-Mo...n-88974587.htm
    It looks on the surface to be a good idea, but I'm just not sure of what problems you'd face throwing sidedraughts in a system that's designed for downdraughts. Fitting the airbox would probably be the least of the problems.

    Quote Originally Posted by crazybigal View Post
    yeah but you will prob run into the same problems! looks to be a design fault.
    mind you they prob never intended to get 100k out of them!
    Yep - the way I see it, if the old ones lasted for 100,000 kms then I should expect at least 50,000 out of the next ones. And at that stage there'll be a few other things to worry about as well, so it will probably be time to move on to the next one.

    And Fatjim - the next time we meet at Melling lights - your bike is toast. I'll have the carbs from an RF900RV Manta Ray Special on there. Might just advance the ignition a tad too while I'm at it. Better bring the Bayliss and not the hairdressers bike...
    And I to my motorcycle parked like the soul of the junkyard. Restored, a bicycle fleshed with power, and tore off. Up Highway 106 continually drunk on the wind in my mouth. Wringing the handlebar for speed, wild to be wreckage forever.

    - James Dickey, Cherrylog Road.

  3. #33
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    Cool

    Hey there is someone on Trade Me in the motoring section having problems with these Mikuni carbs as well.

    If anyone can help this dude out........ post in his thread.

    http://www.trademe.co.nz/Community/M...eadid=15615315
    Quote Originally Posted by glyn
    Mikuni Bike Carb Jet Sizes?
    Does any one know if the jet sizes in Mikuni carbs relate to their bore size? ie 130 jet size = 1.30 mm. Or does it relate to fuel flow rate? I believe that Weber jet sizes relate to bore size. glyn4 5:49 pm, 24 Feb

  4. #34
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    for sure, prb a bit much dicking around with it. i see the suppliers of Keihin list a carb to retro fit the rf900 model 016-504, mind you cost you more than your bikes worth!

    Quote Originally Posted by riffer View Post
    It looks on the surface to be a good idea, but I'm just not sure of what problems you'd face throwing sidedraughts in a system that's designed for downdraughts. Fitting the airbox would probably be the least of the problems.



    Yep - the way I see it, if the old ones lasted for 100,000 kms then I should expect at least 50,000 out of the next ones. And at that stage there'll be a few other things to worry about as well, so it will probably be time to move on to the next one.

    And Fatjim - the next time we meet at Melling lights - your bike is toast. I'll have the carbs from an RF900RV Manta Ray Special on there. Might just advance the ignition a tad too while I'm at it. Better bring the Bayliss and not the hairdressers bike...
    its Crazy Big Al but if your have lesbian fantasies you can read it crazy bi gal if you like!

  5. #35
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    The Bayliss is the hairdresser's bike mate.


    BTW, the Yawn needs the carbies balancing. you must be an expert by now, fancy giving me a hand?
    Some things are worth dying for, living is one of them.

  6. #36
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    Quote Originally Posted by crashe View Post
    Hey there is someone on Trade Me in the motoring section having problems with these Mikuni carbs as well.

    If anyone can help this dude out........ post in his thread.

    http://www.trademe.co.nz/Community/M...eadid=15615315
    These Mikuni carbs? That's like saying These Dunlop tyres. There are probably more mikuni carbs than any other single make & half squillion different types. Your Vertigo probably has Miks (or maybe Hitachi). This guys issue is just of jet measurement (which can't be answered as mikuni run both flow & drill size jets & as usual he has assumed that everyone is a mindreader).
    Don't you look at my accountant.
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  7. #37
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    Quote Originally Posted by F5 Dave View Post
    These Mikuni carbs? That's like saying These Dunlop tyres. There are probably more mikuni carbs than any other single make & half squillion different types. Your Vertigo probably has Miks (or maybe Hitachi). This guys issue is just of jet measurement (which can't be answered as mikuni run both flow & drill size jets & as usual he has assumed that everyone is a mindreader).
    Oh ok..... I just spotted the thread... saw it was the same brand as Riffer's...

    Cos I know jack-shit about carbs....

    So thought ahha...... someone on here could help him out....

  8. #38
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    Bound to be a good set of carbs at a wreckers for a good price!!
    You may have to sell your guitar!!!!!
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  9. #39
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    Fuck off Rick!

    The Gibson's a keeper!

    Got the carbs sorted thanks. Just requires some juggling of the next month's finances a bit.
    And I to my motorcycle parked like the soul of the junkyard. Restored, a bicycle fleshed with power, and tore off. Up Highway 106 continually drunk on the wind in my mouth. Wringing the handlebar for speed, wild to be wreckage forever.

    - James Dickey, Cherrylog Road.

  10. #40
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    Quote Originally Posted by Fatjim View Post
    BTW, the Yawn needs the carbies balancing. you must be an expert by now, fancy giving me a hand?
    Believe it or not Jim, I've never actually balanced carbs in my life. I will be needing to though when I get the new ones, as they will be set up totally different.

    Perhaps someone with some skills could run a clinic for a few of us guys.
    And I to my motorcycle parked like the soul of the junkyard. Restored, a bicycle fleshed with power, and tore off. Up Highway 106 continually drunk on the wind in my mouth. Wringing the handlebar for speed, wild to be wreckage forever.

    - James Dickey, Cherrylog Road.

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