'Seen a lot of inquiries on what performance mods are available for the TTR230. Here's a few for those interested: EASTERN USA www.xtrememinis.com While they don't advertise mods for the TTR230 specifically, I contacted them. They do crank, flywheel, and hear porting services for the 230. They will also soon be providing details on a full 250cc upgrade. WEST COAST www.xr100.com/ttr230.htm Engines Only. Big bore kits, intake mods, headwork & camshaft mods, flywheel mods. They seem a bit more pricey than xtrememinis though, don't know if the services are better. www.webcamshafts.com Web Cam Racing Cams. Call them first - they'll do camshaft work for the TTR225 which has the same engine as the 230 so you'll need to make sure. There's still big gaps for other aftermarket parts, though. I guess in time those things will start surfacing as well.