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Discussion Starter #1
Is there anyone who could tell me where the TTR230 gets the extra 5cc's over the TTR225. I have a complete TTR225 motor and (excuding carb) a almost complete TW200 motor and want to make a 6 speed, TW230 by combining both motors.



Ronnydog
 

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Marketing.



Both are 70 x 58, near as I can tell.
 

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Double tap...
 

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Discussion Starter #6
Which Yamaha did and they called it a 250. Go figger. It came in the Timberwolf/Beartracker.



Reminds me of the movie "Spinal Tap"..... ""Mine goes to 11."



Hadda be there. Old guy thing by now.


I talked to a factory rep and he said the 5cc is in the higher comp in the 230?



Ronnydog
 

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I talked to a factory rep and he said the 5cc is in the higher comp in the 230?



Ronnydog


Higher compression would usually mean either LESS chamber volume, thinner gaskets, a domed piston, or a bore increase without changing the chamber volume. Doesn't make a lot of sense that they would increase it, but it would be interesting to know if there is a difference in the heads other than the spigots, since the valves seem to be the same. Practically hugging one another,no?



All I gots is TW heads. I don't know. Normally combustion chamber volume isn't added to the published displacement of a motor, but maybe Yamaha is in fact doing the "Spinal Tap" thing.



For those of you who aren't old enough to get the reference:



http://www.youtube.com/watch?v=hN5SCRvhMtk



Spinal Tap was a spoof film about a fictitious rock and roll band. Some of us old farts actually found this entertaining at the time. Go figger.
 

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So what is the dif in your 230 and the 225 in cc's?
There is no difference, as said before it's a marketing thing.

TTR225 and TTR230 are both 223cc and both 9.5-1 comp. ratio. I think they may have different carbs, if this is a big enough change for Yamaha to consider it a new model I don't know.
 
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