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Thread: new 50 (maybe)

  1. #1
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    1st March 2011 - 19:15
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    new 50 (maybe)

    The story is I sold my little Honda 50 onto Terrene as I wanted to build this next one. If I had kept the Honda I would have spent too much time I do not have making constant changes to it and the project would stay under my shelf.
    The plan is:
    I found a very cheap SR50 Aprilia on TM it had a big bore 70 kit and all the Malossi variators and electronics but ran like a dog so it's owner gave up.
    1st job was to bin the cylinder and find a 50cc one. I ended up with an RS50 cylinder that the boys from ESE had sat on a bench and have spent quite a few hours matching it to the cases and vice versa.
    I also have another aluminium Aprilia cylinder with twin ex ports that fits as well.
    Port timing using the Aprilia piston was wild so a Barikit one was found and it is so much better.
    The Aprilia piston is too long above the pin and gave me 204 and 140*
    I have a semi down draft carb but still need to find a manifold.
    I plan on rebuilding the crank, throwing in new bearings and seals and giving it a nudge, what could go wrong

  2. #2
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    1st March 2011 - 19:15
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    I'll chuck up photo's as I go.
    I think it's a good job I have mates with unwanted parts as this could be doomed to fail, but if it works I am after 14-16 bhp and cvt, not asking for much. If it does go belly up all parts will be recycled I'm sure
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  3. #3
    Join Date
    12th February 2004 - 10:29
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    bucket FZR/MB100
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    Henderson, Waitakere
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    Quote Originally Posted by cotswold View Post
    The Aprilia piston is too long above the pin and gave me 204 and 140*
    A shorter piston will give you even more. It won't have to move so far ATDC before a port is exposed. If you set the same deck height for both pistons of course it won't make any difference.

  4. #4
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    1st March 2011 - 19:15
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    Quote Originally Posted by speedpro View Post
    A shorter piston will give you even more. It won't have to move so far ATDC before a port is exposed. If you set the same deck height for both pistons of course it won't make any difference.
    I had to lift the cylinder nearly 3mm with the Aprilia piston but just a base gasket using the Barakt

  5. #5
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    1st March 2011 - 19:15
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    Bones are being fleshed out.
    a little cutting and maybe a different front end
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  6. #6
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    1st March 2011 - 19:15
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  7. #7
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    1st March 2011 - 19:15
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    been doing a bit of work on the CVT project, I rebuilt the crank with a bit of help but it is still a piece of crap but I'll try it out before going to the trouble of finding a better one, I needed to make an adaptor plate to fit the carb and manifold so been busy in the shed with my trusty Dremmil and a drill
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  8. #8
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    10th January 2016 - 12:35
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    Multiple ones!
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    Very interested to see how the mounting of the fairing/seat comes out and also how to fab up the foot pegs

  9. #9
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    5th April 2004 - 20:04
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    wellington
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    Someone buy this man a holesaw set.
    Polemic....look it up

  10. #10
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    1st March 2011 - 19:15
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    bit of a direction change

    [QUOTE=cotswold;1131008586]The story is I sold my little Honda 50 onto Terrene as I wanted to build this next one. If I had kept the Honda I would have spent too much time I do not have making constant changes to it and the project would stay under my shelf.
    The plan is: WAS
    New plan.

    I was offered a pretty hot NSR50 engine along with so many parts that it all weighed 180kg. The motor ran in a series in the Netherlands and has been developed by its ex owner Jenne Smit.
    Not sure if any of you remember but Jenne gave me plenty of technical advise when I was building my NSR engine, I managed to get 14bhp with a 28mm PWK using the cast iron Honda cylinder, Jenne used an aftermarket aluminium cylinder and a tiny carby as was their rules and has a dyno pull of 17bhp.
    It all turned up in a crate a few weeks ago and myself and ESE (culley) have started putting it into an NF4 chassis that had previously held a 12bhp RG50 motor.
    The photo's are it's progression.
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  11. #11
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    1st March 2011 - 19:15
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    The forks came in the crate and will be added in due course as they are an obvious upgrade on the NF4 ones.
    I'll keep putting photo's up as it progresses.
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  12. #12
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    25th March 2004 - 17:22
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    A Honda in a RS frame? That's novel for a 50 . Should be a weapon. What sort of revs and power spread?
    I've been told. Dreaming`s free.
    Think I'll go, back to sleep.
    Everybody listen, voices in my head
    Everybody listen, do yours say, what mine says?

  13. #13
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    1st March 2011 - 19:15
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    Quote Originally Posted by F5 Dave View Post
    A Honda in a RS frame? That's novel for a 50 . Should be a weapon. What sort of revs and power spread?
    I've lost the Dyno pic that Jenne sent me but I'll post up the one we do on ESE's machine when we get it running, I'm a bit excited and nervous at the same time.

  14. #14
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    1st March 2011 - 19:15
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    jennes Dyno

    I'm pretty sure this is the one I have been searching for
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  15. #15
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    25th March 2004 - 17:22
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    It's not revving as high as I would have thought. My pet hate though is a graph that doesn't start at zero.
    I've been told. Dreaming`s free.
    Think I'll go, back to sleep.
    Everybody listen, voices in my head
    Everybody listen, do yours say, what mine says?

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