TW225

[r80rt]

I'm considering building a 225cc engine for my TW. As I understand it, I can just swap the crank, cylinder and piston. Will I also need to use the 225 clutch? Will I need to open up the cases to accept the 225 cylinder? Anything else I'm missing?

[macbig2k1]

You don't really need a 225 cylinder, you can also use a 225 sleeve in your 200 cylinder.

You can keep your clutch. 5 disks are good for 225ccm.



- 225 crank

- 225 piston (70mm is std, available up to 73mm)

- 225 cylinder or sleeve

- gaskets (foot and head is minimum)

- bigger case opening

->> finished.



And don't forget to rejet the carb.

[r80rt]

Thank ya sir, I've read everything I could find on the conversion, but just wanted to be sure I hadn't missed anything.

[stephenmarklay]

With a 225 can you run better than a 47 rear and not lose too much everywhere? That would be the biggest benefit I can see.

[r80rt]

Sorry, one more question, Which timing chain. Will the TW chain work or should I get one for a 225?

[ronnydog]

Sorry, one more question, Which timing chain. Will the TW chain work or should I get one for a 225?

Yes Tw timing chain is the same as the TTR225. There is a small mod between the TW head and the TTR cylinder that will need to be done. I dont have pics but you can pm me and I can walk you through it. My TW226 I used the TW clutch with barnett parts and it has worked fine for years. Same clutch for the Iron Butt!





Ronnydog

[r80rt]

Thanks, PM sent.

[seantx]

Does the crank need to be changed or is this just a cylinder and piston swap?

[macbig2k1]

Yes, you have to change the crank!!!

[flyhunter3825]

Just a confirmation, does it matter what years these parts come from?