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Question about capacity...

Discussion in 'Tech Help' started by Anmic, Dec 26, 2015.

  1. Anmic
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    Anmic Member Supporter

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    So looking at engines to potentially race in the motolite class and i'd like to run a 2 valve 230cc four stroke engine. Currently the main options are an XR 200 and bore it out or an XT/AG 200-225 engine. Neither of these options are proving very easy to come by so ive got a couple of questions for all you more experienced engine guys -

    1/ Could you reduce the capacity of a 250cc single easily enough to get it to 230? Or is the cost going to be much the same as trying to get either of my top two engines working?

    or

    2/ Are there other bikes out there that would fit the bill that i dont know about and you can enlighten me?

    Cheers!
     
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  2. supamodel
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    supamodel Secret Aaaaaagent Man Staff Member Moderator Supporter

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    CRF230 would be the ultimate motor I would have thought?

    Sleeving a cylinder is definitely not that cheap to run smaller bore pistons, and shortening the stroke is even more work to get back the compression you lose doing so.
     
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  3. Anmic
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    Anmic Member Supporter

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    Yea it would, problem being i dont have the cash to play with to fund an engine like that. I thought that would be the case. I shall continue searching or just run another two stroke. lol
     
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  4. gazman
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    Yamaha TTR 230cc single 4 stroke
    Suzuki DR 200cc (little low cc maybe)
     
    Last edited: Dec 27, 2015
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  5. Anmic
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    The problem with the DR200 is that they apparently make sweet f all power compared to the other 200's
     
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  6. gazman
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    230 cc engine seems so rare to be racing as it doesn't give much choice. It's a shame they don't go with a more main stream 250cc . I'm sure there is a reason why that I can't think of.
     
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  7. supamodel
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    supamodel Secret Aaaaaagent Man Staff Member Moderator Supporter

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    They restrict it to 230cc 4v single air cooled4 strokes for the propose of parity with other motors.
    I am pretty sure that's based on the crf or ttr230 motors that are out there.
    I would be surprised if one could get a 200 up to 230 or a 250 down to 230 for less than a grand in machine work. You can pick up a crf or TTR for twice that and then part out the running gear.
     
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  8. gazman
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    $_20.JPG
    sold in low numbers so considered "RARE" on ebay, there could be a premium $$$ :1.gif:
     
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  9. supamodel
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    supamodel Secret Aaaaaagent Man Staff Member Moderator Supporter

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    Yeah, same motor iirc as the crf230 :).
     
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  10. Anmic
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    Or should i play with the 190cc laydown motors or a 85cc two stroke... this is the battle i have with my brain.
     
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  11. supamodel
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    supamodel Secret Aaaaaagent Man Staff Member Moderator Supporter

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    The Anima daytona 4v motors are meant to be pretty rad. That'd be my suggestion :). 185cc I think?
     
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  12. jaffa
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    I was running a Moriwaki 80 in the Motolites last year oops....2014, it was a great little machine however, I weighed almost 2 x's the bike so even though I could mix it with most in the tight stuff, any straight with a bit of length had me being blown away. Don't discount the smaller water called strokers, they are great fun to ride and the Mori's give a good handling package. In the 2014 1 hour, we had the bike into 5th outright at one stage. You may be able to get it at a reasonable price too.....(not my bike)
     
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  13. timeeh
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    I was going to suggest a china ;) The old daytona (before the Anima) was a 2V but i think it was 150CC at biggest. You could look at a KLX110 motor, speced out with Taki gear will get you to around 196CC and with a race head somewhere around 25-30hp, but big $'s to go that far, a cheap alternative is a YX160 with a bore kit to go to 184 or get the case bored and take it to 201CC. Combined with a V2 race head and it's not a bad little engine. All up (around) $1500 should get you a brand new YX160 + bore + race head + carb.
     
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