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Thread: New guy starting a build project

  1. #16
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    25th March 2004 - 17:22
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    It was just an idea for a simpler build, it would all stay fitted to std engine mounts, - just remove parts so one cylinder went. Heck sounds a bit like Chris's 600-450 conversion.

    There was a chap that fitted a VTR cylinder to a CB125 bottom end (back in the day when 4 bangers were only allowed 125cc), but never heard much more of it.


    Of course there will be more effective engines which will be lighter; but can be expensive & time consuming to develop a 2 stroke.
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  2. #17
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    16th November 2006 - 23:46
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    Ivan has a VTR sitting in his garden. There's soo many of the freaken things around you will be able to make a engine for barely anything.

  3. #18
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    that newmanz rc direct guy is selling a cbr150r replica motors {watercooled}....probualy makes good power but relability wouldnt be too good.
    chuck norris's calender goes from march 31st to april 2nd

    No one fools chuck norris.......

  4. #19
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    Read the bit about the budget in first post. He will need to break it for tyres so brand new engines are out for sure.

    Of course you can fit the 750 6 speeder in the later FZR cases so probably in the Genesis as well. Think they go out to 1040 easy enough but JE can make pistons to suit any application. Some race spec Brembos would have to be the go as R1 calipers will fit but out of period.
    Don't you look at my accountant.
    He's the only one I've got.

  5. #20
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    1st April 2007 - 18:04
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    Depending on yer taste for the motor (2 smoke or 4).

    A 2 Stroke motor would be cheaper to buy but need a lot of ongonig development and maintenance. GP125's Rx125's and the Trusty but heavily modified H100.

    Four stroke Depending on how competitive you want to be. I had a Loncin motor (very reliable) but it won't get you to the front of the pack. The most popular options being the FXR150 motor (expensive tho ). If you could find a good cb125twin motor that would be an interesting option, they are getting on a bit in years but still very competitive and reasonbly priced.

    Put as much thought into your suspension and tyres as you do your motor

    just my humble opinion.

  6. #21
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    Quote Originally Posted by SHELRACING View Post
    The most popular options being the FXR150 motor (expensive tho ).
    Like everything you just have to hang out for a bargin or its a right place right time sort of thing as well or word of mouth. We've picked up a fxr150 engine(bugger all k's on it) with electric's, put it into a cbr250 frame and is now running and ready for the next event at roys hill. Engine, carb and electrics for as much as a new lonchin.

  7. #22
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    9th October 2008 - 15:52
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    Quote Originally Posted by Schrgd View Post
    What about keeping rear cyl on vtr and converting to compresser of sort's?
    Twice the compression per four stroke revoulution, and just sleeve front cyl down to remain legal!?! What a hairbrained idea that is unless it actually works! lol
    Super charger driven off then second cam chain perhaps?
    I think both barrels are off the motor at the moment but I cant access the photos because it was listing and not auction so the buyer removed it once I contacted him to purchace it.I might try finding some 17 inch wheels but may have to be later on after running it a while/

  8. #23
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    9th October 2008 - 15:52
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    Quote Originally Posted by F5 Dave View Post
    It was just an idea for a simpler build, it would all stay fitted to std engine mounts, - just remove parts so one cylinder went. Heck sounds a bit like Chris's 600-450 conversion.

    There was a chap that fitted a VTR cylinder to a CB125 bottom end (back in the day when 4 bangers were only allowed 125cc), but never heard much more of it.


    Of course there will be more effective engines which will be lighter; but can be expensive & time consuming to develop a 2 stroke.
    The attractive thing is that because conversion is a twin then can remove the whole top end and then not have to worry about cams and valves opening and letting fuel in because they just wont exist.

  9. #24
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    & you mean just leave the piston flailing about with no head on it? Maybe a perspex head cover to keep dust out & some total loss lubricating oil in. Have to block off the oil feeds to upper head or lose pressure to where you want it.

    Or you hook the rod off with blanking depending on the crank lubrication & rebalance the crank.
    Don't you look at my accountant.
    He's the only one I've got.

  10. #25
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    9th October 2008 - 15:52
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    Quote Originally Posted by F5 Dave View Post
    & you mean just leave the piston flailing about with no head on it? Maybe a perspex head cover to keep dust out & some total loss lubricating oil in. Have to block off the oil feeds to upper head or lose pressure to where you want it.

    Or you hook the rod off with blanking depending on the crank lubrication & rebalance the crank.
    Talking about removing rod and whole top end then plate over base gasket.Will need to resurch crank balance as assume it will be out by weight of one conrod and piston.Noob question.Is the crank balanced without rods etc and does this meen it will be the same as a single with rods attatched?

  11. #26
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    Look at a Ducati supermono... Further to what Dave said you may be able to do a budget version by leaving the piston in or making a dummy "rod guide" that is the same weight as the piston but doesn't pump heaps of air. Perhaps divert the old head lube to keep it wet.
    I had alot of thoughts on this because I had one I got for a pack of bickies. I ended up giving it to Ivan and there it rests.

    EDIT: All this is still going to cost more tha $150, even if you get all the bits for free.
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  12. #27
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    You could machine the top of the piston out to cut down on pumping losses and leave the cam out. Not sure if the balancing effect you get will be worth the power you lose to it though.
    Here we all are taking wild guesses at what can be done with the existing motor and it may turn out to be a complete anchor yet.

  13. #28
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    9th October 2008 - 15:52
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    Quote Originally Posted by F5 Dave View Post
    Read the bit about the budget in first post. He will need to break it for tyres so brand new engines are out for sure.

    Of course you can fit the 750 6 speeder in the later FZR cases so probably in the Genesis as well. Think they go out to 1040 easy enough but JE can make pistons to suit any application. Some race spec Brembos would have to be the go as R1 calipers will fit but out of period.
    I got the first exup 89.Have a wiseco 1040 kit just arrived this week and new conrod bolts.my brakes are full rebuild with piston seals and master and braided lines.It will do stoppies at high speed so they are good.Just wasnt sure about the strength of 6 speed as with the fcrs and rebuild we will look for 160rwhp(currently 144).

  14. #29
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    Quote Originally Posted by koba View Post
    Look at a Ducati supermono... Further to what Dave said you may be able to do a budget version by leaving the piston in or making a dummy "rod guide" that is the same weight as the piston but doesn't pump heaps of air. Perhaps divert the old head lube to keep it wet.
    I had alot of thoughts on this because I had one I got for a pack of bickies. I ended up giving it to Ivan and there it rests.

    EDIT: All this is still going to cost more tha $150, even if you get all the bits for free.
    the idea is to sell the unwanted vtr road bits to help fund the project.Should get a couple hundy + for them.I have race fairings already and will run it on the existing tyres at first.I also have a few bits in the garage as I stripped a few bikes last year.Just want an interesting engine of some description to fit into it.If I was going to get serious I would get a fxr or two smoker and sink coins until it went fast but im more interested in the drinking of beers after each meeting.

    I could throw the fairings on,turn up and say i cant get it going and drink beer I spose.

  15. #30
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    Quote Originally Posted by mossy1200 View Post
    the idea is to sell the unwanted vtr road bits to help fund the project.Should get a couple hundy + for them.I have race fairings already and will run it on the existing tyres at first.I also have a few bits in the garage as I stripped a few bikes last year.Just want an interesting engine of some description to fit into it.If I was going to get serious I would get a fxr or two smoker and sink coins until it went fast but im more interested in the drinking of beers after each meeting.

    I could throw the fairings on,turn up and say i cant get it going and drink beer I spose.
    It's a start...
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