Tuning options cast gp175?

[Adam_Winstone]

Again, it all depends what you want out of your motor. As others have suggested, your current performance seems reasonable already. Bearing in mind that a change to Suzuki 185 woould require a conversion rebore, head re-profiled, porting work, etc. (if the current porting allows) then you're not really any further forward than if you started with a 10 a penny standard 150 iron barrel.

I'm not trying to put you off looking into your options, just suggesting that a change of piston, porting and head would be similar regardless of the barrel you start with and that it seems a bit of a waste of the money that you've already spent on this barrel work.

As suggested, a call to JB might be your best option as he probablly has your barrel details on file and can tell you what has been done and what options are still open to you.

Adam