[ronnydog]

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

 

[lizrdbrth]

Marketing.



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

 

[abyssdncr]

Double tap...

 

[abyssdncr]

Marketing.



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

Indeed, both are actually 223 cc:



http://www.bikez.com/motorcycles/yamaha_tt-r230_2009.php



http://www.bikez.com/motorcycles/yamaha_tt-r_225_2005.php







Bore it 1mm over and you get 229.63 cc...

 

[lizrdbrth]

Indeed, both are actually 223 cc:



http://www.bikez.com/motorcycles/yamaha_tt-r230_2009.php



http://www.bikez.com/motorcycles/yamaha_tt-r_225_2005.php







Bore it 1mm over and you get 229.63 cc...

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.

 

[ronnydog]

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

 

[lizrdbrth]

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.

 

[uktw125]

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



Ronnydog

Your factory rep. has some funny ideas. My TTR230 cylinder has 223cc cast into the barrel and the Yamaha web site lists the TTr230 as 223cc.



http://www.yamaha-motor.com/sport/products/modelspecs/414/0/specs.aspx

 

[ronnydog]

Your factory rep. has some funny ideas. My TTR230 cylinder has 223cc cast into the barrel and the Yamaha web site lists the TTr230 as 223cc.



http://www.yamaha-motor.com/sport/products/modelspecs/414/0/specs.aspx

So what is the dif in your 230 and the 225 in cc's?

 

[uktw125]

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.