221 rebuild

[Dave Lawson]

Hi all,
Just pulled down the 221 going into the XT.
It will need a re-bore.
Question is which pistons to use?
Building as a stock motor but don’t want to lose compression with the wrong dish pistons.
Cheers.

 

[aussie7mains]

221s have a mid sized dish, about 50mm diameter and 3mm deep. You could use flat tops from the 200s, but they are a bit hard to find. Unleaded 250 has biggest dish, 250 has smaller dish, but a bit big for a 221. Ive used flat tops in 221s, they are OK.

 

[Dave Lawson]

Found these.
Would they be ok?

 

[aussie7mains]

Yes.