89 z50r vs 86 trx70...z50 no contest,why?

Discussion in 'General' started by RMY32, Aug 23, 2017.

  1. RMY32

    RMY32 New Member

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    I have both it excellent shape, the z50 will walk all over the trx70 in every way. I understand weight, rotational mass etc..but differences aside, one would think the 72cc could either out perform the 49cc low end OR top end. Especially since the trx70 is a 4spd. They are geared near identical except for the 2nd gear on the trx70 is slipped in between the z50s 1st+2nd. I was hoping to see what others thought about this.
     
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  3. cjpayne

    cjpayne Well-Known Member

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    Im thinking the TRX has a tired engine and/or the Z50 is hopped up.lol
     
  4. RMY32

    RMY32 New Member

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    The trx actually has an 88cc tb cylinder and piston kit in it! Lol I installed it thinking it was in fact tired like you said. The z50 is bone stock. After looking at the cam specs of the z50 which are quite unusual I'm wondering if its not the cam combined with an extremely efficient little engine that gives the 50 its fantastic power curve.
     

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