Regular 225 Opti vs 250 Opti XS

[stingray240cs]

Hello,
could you help me to find out the difference between the Optimax 250XS and the regular Optimax 225? The 225 is the biggest Optimax available in Austria. I would like to have a bit more power for my 21´cat. Both engines are the 3L blocks, the 250 turns some 250 RPM more (the LU is different). Is there a easy way to get the 250 HP from the 225?
Thanks for all hints.
Roman
Vienna,Austria

[captcarb]

It's a bit more than 25 hp difference.

jim

[shep70057]

Would you happen to have that curve chart for the 225 Pro XS??

[captcarb]

Sorry

[jimmyb]

quick differences between 225 opti and 250XS:

liners
pistons
cylinder head

those differences alone make it economically unfeasable to try and upgrade

[stingray240cs]

Jimmyb,

thanks for the hint.

[billybob]

also most xs motors run higher fuel & air pressures than stock motors. & rpm limiters are 500 rpm higher making more hp.

[jimmbo]

quick differences between 225 opti and 250XS:

liners
pistons
cylinder head

those differences alone make it economically unfeasable to try and upgrade

Sounds like there was a difference in port timings, with a drop in compression, hence the different cylinder head to restore the compression

[billybob]

the engine blocks come down the same assy. line, on the newer motors. the only diff. is black inj,s that run 105-90 psi on xs motors & the ecm.

[Bullet89]

The 250 XS motors have a higher port timing, carbon fiber reeds, higher air & fuel pressure and Gray injectors. They only also have different fuel and ignition curves and higher rev limit. Only the outside of the blocks are the same.