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feralkid
The Day Starts With OZATV !
Joined: 29 Oct 2007
Posts: 1567
Location: North Western Victoria
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 Posted: Sat Feb 27, 2010 1:51 pm Post subject: Is the yfz450 motor the same as the Wr or Yz. |
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As the title says which one is it the same as or are they all the same? Also do the same years match up or is the yfz the same as the older models of the 2 wheelers or the same years.
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triple"A"
Roostin Away
Joined: 04 Aug 2006
Posts: 941
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| Posted: Sun Feb 28, 2010 10:29 am Post subject: |
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| no, not exactly the same, but very very similar |
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Quad
The Day Starts With OZATV !
Joined: 22 Oct 2006
Posts: 2773
Location: UP FRONT
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| Posted: Sun Feb 28, 2010 3:16 pm Post subject: |
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more the wr motor is
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1sick6
Big Bore, Stroked & Bling +
Joined: 20 Dec 2006
Posts: 340
Location: SA
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| Posted: Sun Feb 28, 2010 4:24 pm Post subject: |
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what differences do they have??
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dangerman4
Roostin Away
Joined: 31 Mar 2007
Posts: 854
Location: Morphett Vale
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| Posted: Sun Feb 28, 2010 5:05 pm Post subject: |
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i would asume the yz isnt eletric start so count that out.
the wr would be very similar, maybe a wider ratio gearbox. |
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noodles
Big Bore, Stroked & Bling +
Joined: 31 Mar 2006
Posts: 331
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| Posted: Sun Feb 28, 2010 6:28 pm Post subject: |
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manual decomp on wr not automatic as on yfz
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bigjon
Moderator
Joined: 17 Feb 2006
Posts: 1279
Location: Dubbo
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| Posted: Sun Feb 28, 2010 8:55 pm Post subject: |
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I don't know about the R, but with comparing the YZ to the YFZ
Exhaust cam timing (thus the cam-mod)
Stroke 63.4 vs 62
Different flywheel
Slight differences in the FCR carbs
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PeteW
Moderator
Joined: 09 Feb 2006
Posts: 1877
Location: Doreen, Vic
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| Posted: Fri Mar 05, 2010 3:11 pm Post subject: |
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n the earlier models the YFZ was more similar to the WR, (you can make the same cam mod on a WR motor to the YZ timing) with a similar 5 speed gear box (compared to the YZs 4 speed) and electric start, there were also differences in the piston pin size and stroke from the first (03/04) YFZ's as they were stroked down to 439 cc to fit under the AMA/ATVA pro production rules at the time, a rule which was then changed the following year when Honda released the TRX450 so the YFZ got a new crank to bring it up to 449cc
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