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Thread: MB100 development

  1. #391
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    Quote Originally Posted by husaberg View Post
    300 seems fair enough,but if are in the right place you can get complete bikes for that with spares its the luck of the draw,
    Have you have you tried Ebay for a 1980-1982 Cr80 (Red engine gearbox)
    they are better ratios than the MB5.
    Have found complete '99 cr80 transmission for $180. Will this fit and worth buying or are the ratios too wrong?

  2. #392
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    Quote Originally Posted by flyingbrick View Post
    Have found complete '99 cr80 transmission for $180. Will this fit and worth buying or are the ratios too wrong?
    Never tried
    the one we know this fits is the 1980 -1981 cr80.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  3. #393
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    In 20 years one would expect they would have made the cases smaller.
    Don't you look at my accountant.
    He's the only one I've got.

  4. #394
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    Quote Originally Posted by F5 Dave View Post
    In 20 years one would expect they would have made the cases smaller.
    I have a late cr80 here the gear center spacing is about the same 75mm ish.
    The selctors set up are different
    the primary gears are much narrower though, clutch about the same.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  5. #395
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    @husaberg

    Who would you recommend to supply carb kits for this pair of mikunis? Damn nice looking items- feel like much higher quality than the Chinese ones I have.

  6. #396
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    Quote Originally Posted by flyingbrick View Post
    @husaberg

    Who would you recommend to supply carb kits for this pair of mikunis? Damn nice looking items- feel like much higher quality than the Chinese ones I have.
    oe only likely although RM80's had a similar carb but not downdraft.
    https://www.mikunioz.com/flat-side-c...v=8e3eb2c69a18
    https://www.ebay.com/itm/Suzuki-RM80...s=Model%3ARM80

    NZ
    http://motozone.nz/all-balls-carburetor-rebuild-kit
    B261115
    CARBURETOR REBUILD KIT RM80 1986-95 - INDENT Ask a question about this item SOLD OUT $51.15


    The only thing that wears out is the float valve. and Needle jet.
    both are common mikuni parts as designated by their VM part number.
    ps the Choke off the MB100 fits the Mikuni.
    You might want to drill out the fuel tap or preferably fit a larger one on that MB before you tune it as well.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  7. #397
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    As usual.. thanks tons for the amazing advice mate. Very cool.

    Very happy about the choke situation as didnt want to stuff around with an extra cable.

    I guess its time to go pre-mix because the oil pump to throttle position is going to be pretty hard to get right with new carb.

    @husaberg how can i get this rd reed assembly off ya? :-D

  8. #398
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    Quote Originally Posted by flyingbrick View Post
    As usual.. thanks tons for the amazing advice mate. Very cool.

    Very happy about the choke situation as didnt want to stuff around with an extra cable.

    I guess its time to go pre-mix because the oil pump to throttle position is going to be pretty hard to get right with new carb.

    @husaberg how can i get this rd reed assembly off ya? :-D
    i will send it up pretty sure i have your Address?
    I have couriers bags i will see what else i have kicking about i know i have a cylinder spacer.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  9. #399
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    Quote Originally Posted by flyingbrick View Post
    Thanks mate. Do many people get wider aluminium rims laced into place?
    https://www.trademe.co.nz/motors/mot...943a40e30cd26b
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  10. #400
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    Hi everyone, hope you are all well.

    I tried getting my MB to cold kiwi put a hole in the piston.

    Darn thing had been so reliable too, would have been a real novelty!!

    So now i'm on the hunt for a new piston (and will put on my bigger reed assembly, intake and carb etc while im there)

    So where is a good source for pistons? Getting a bit frustrated with availability of old bike parts lol

    I even bought a Yamaha wr200 engine to shoehorn in, figured it would be a nice boost in power and the package is essentially the same size. Alas it was not to be- the motors bottom end is full of water and stuck solid.

  11. #401
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    Quote Originally Posted by flyingbrick View Post
    Hi everyone, hope you are all well.

    I tried getting my MB to cold kiwi put a hole in the piston.

    Darn thing had been so reliable too, would have been a real novelty!!

    So now i'm on the hunt for a new piston (and will put on my bigger reed assembly, intake and carb etc while im there)

    So where is a good source for pistons? Getting a bit frustrated with availability of old bike parts lol

    I even bought a Yamaha wr200 engine to shoehorn in, figured it would be a nice boost in power and the package is essentially the same size. Alas it was not to be- the motors bottom end is full of water and stuck solid.
    TKRJ or a
    Strike in 52mm but as they are single ring they will need rings more regular. but come in tiny increments thus will never need rebores as hone to size.
    What plug were you running as it should have nothing lower in number than a NKG"8".
    KT100S
    http://www.strikeproducts.com.au/pistons.asp

    (NOT KT100J)
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  12. #402
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    I took my RG50 to cold kiwi. From Wellington. 6 times. Leaving 1100 in the garage.

    Was a big rally in the 90s.
    Don't you look at my accountant.
    He's the only one I've got.

  13. #403
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    Thanks all. Will check plug. I had changed it right before the ride but it should have been good.

    Question, do you use the spring loaded 3 stone hones on this kind of thing? And then measure and tell strike what the finished size is so that they can supply the right piston?

    Is the ledge top and bottom of the reed valve pocket there for any particular reason? Looks like it could be chamfered down significantly to increase flow?

  14. #404
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    Think about flow out of the reeds. Actually it is pretty raw in that area.

    You need a proper hone not one of those spindly things else damage can occur. They look like a barrel with a dial to increase size.
    Don't you look at my accountant.
    He's the only one I've got.

  15. #405
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    Quote Originally Posted by flyingbrick View Post
    Thanks all. Will check plug. I had changed it right before the ride but it should have been good.

    Question, do you use the spring loaded 3 stone hones on this kind of thing? And then measure and tell strike what the finished size is so that they can supply the right piston?

    Is the ledge top and bottom of the reed valve pocket there for any particular reason? Looks like it could be chamfered down significantly to increase flow?
    He takes the cylinder to the local kart shop and tells them what he wants.
    You are also best to find an Airooled CR80 cylinder and copy that

    if you PM or text this guy
    he might lend you one
    https://www.kiwibiker.co.nz/forums/m.../21379-Hilleye
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

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