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Thread: Tw200 Motor swap

  1. #1
    Junior Member 3pedaldan's Avatar
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    Tw200 Motor swap

    Hey guys, new here and new to TWs. I bought mine a year ago and logged 2k miles of trails on it along with 1000 of commuting. I love this bike. Handles and brakes better than any sport bike Iíve ever ridden. However since I moved further away from my work and itís all highway in North Jersey, I canít peg the tw at top speed for 45mins each way every day, And I come from a 4x4 background engine swaps and custom fabrication are the norm. I looked around and just saw everyone say engine swaps arenít possible or too expensive or not worth it. However Iím a welder/machinist and want to tackle this. I want to keep a carb, have a parallel twin for packaging, and to keep the bike as close to stock weight as possible. Not many engines to choose from in North America, then I remembered ninja 250s exist. I canít find any info on the outer dimensions of the engine, but any help would be appreciated. I know a new custom longer output sprocket shaft will needed but thatís what my boys who run the lathes and Bridgeport are for.

    Thanks,
    Dan
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  2. #2
    Senior Member SportsterDoc's Avatar
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    I have not seen dimensions for either motor.
    Might have to spend ~$300 for a used motor to get started.
    My 2018 XT250 was only about 10 MPH faster than my 2017 TW200.
    A twin may be an improvement.
    My 1967 CB160 Honda would run an indicated 92 MPH (speedometer error not checked, but strongly suspect).
    OTOH, my 1967 CL160 (used, purchased in 1969) would barely do ~80.
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    2014 Honda CB1100
    2018 Yamaha XT250
    2016 Moto Guzzi V7 II
    2017 Yamaha TW200
    2012 Triumph Bonneville
    2002 H-D Sportster 1200 Sport
    2003 H-D Sportster 883
    1976 Honda CB750F
    1975 Honda CB360
    1970 Yamaha CT1
    1972 Yamaha CT2
    1972 Yamaha AT2/CT2
    1970 Honda SL350
    1970 Honda CL350
    1967 Honda CL160
    1967 Honda CB160
    1962 Honda CA110

  3. #3
    Senior Member Miaugi's Avatar
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    Hi Dan.....welcome to the group! Sounds like you are going to be getting your hands dirty! Good luck with the project!
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  5. #4
    Super Moderator littletommy's Avatar
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    Welcome to the forum!!
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  6. #5
    Senior Member Peterb's Avatar
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    I think I have what you are looking for. If I was going to build a street only TW I would do something like this too.

  7. #6
    Senior Member Fred's Avatar
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    For an off road bike I think I would stick with a single cylinder since the peak torque usually occurs at lower rpm than a twin due to inherent crank and stroke geometry. Same potential for peak torque per unit displacement, just occurs at a lower trail friendly RPM. However for the New Jersey highways a quick spinning twin would be fun. Still, having gobs of single cylinder roll-on torque available to quickly get out of trouble would be good from a safety standpoint.
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  8. #7
    Junior Member 3pedaldan's Avatar
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    Quote Originally Posted by Fred View Post
    For an off road bike I think I would stick with a single cylinder since the peak torque usually occurs at lower rpm than a twin due to inherent crank and stroke geometry. Same potential for peak torque per unit displacement, just occurs at a lower trail friendly RPM. However for the New Jersey highways a quick spinning twin would be fun. Still, having gobs of single cylinder roll-on torque available to quickly get out of trouble would be good from a safety standpoint.
    I know a thumper will always be better for trail riding but at the same time the closest off road park too me is 2 hours away via rt80, Iíll be willing to tach it up more than usual on the trail for extended engine life and comfort on the way there and back
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  9. #8
    Junior Member 3pedaldan's Avatar
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    Quote Originally Posted by Peterb View Post
    I think I have what you are looking for. If I was going to build a street only TW I would do something like this too.
    Mines gotta stay a dual sport haha, or else yea for street only thatís perfect
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  10. #9
    Senior Member Fred's Avatar
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    Off on a tangent here but Honda sure has made some interesting engines over the years that people have thendone even more interesting things with them . 3Pedaldan very well may be the next.
    .

    Here he puts two CT90s together. Twins do sound soooo fine!
    Last edited by Fred; 03-09-2018 at 05:32 PM.
    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. ďMr.Gizmo"
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  11. #10
    Senior Member Peterb's Avatar
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    Has anyone here owned an old Honda CB350 CB360 CB400 CB450 twin? I was looking up specs and I think its the 360 is even a 6 speed. Was there alot of vibration to these engines? Share your thoughts on these engines please I see the 400 hawk had like 43 HP :-) Add some good brakes, suspension and a set of 203/204s "TW400SM" Wish I had a motorcycle wrecking yard.
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