Hey Darryl, can you give me some information on websites and companies that have speed parts for this motor? I did a search yesterday, and couldnt find very much. Especially interested in clutching and ignition /controller mods. Thanks.
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For clutching, I would recommend D & P Performance in Cedar City UT, talk to Dean.
D & P PERFORMANCE CEDAR CITY, UT (800) 842-5172
For internal engine mods, piston, head and cylinder work, call this company:
AFTER MIDNIGHT RACING
For fuel system controllers, we use Power Commander V for the V-twin (AT300 setup) with the Auto-Tune. Also works with M109r fuel injectors out of a Suzuki GSX which flow quite a bit more fuel (13lbs more per hour).
For exhaust, Muzzy is the best there is.
These engines like to breathe... install the second TB (with a cross-over equalization tube), put in the M109r injectors, hook up the PC-V with auto-tune (with dual O2 Sensors), get the heads ported and cleaned up, put Muzzy Duals on, install Dean's clutch rollers (he'll put together what works for your engine, car weight, etc) and then you better have his Spike Load Dampner Delete kit as well as good axles...then it will scream.
This past weekend, I ran my XTZ around the short course with several 4400 cars and a trophy truck.. Other than needing the shocks tuned and swaybars, it was holding it's own out there...
Speedwerx (Hot Seat Performance) has engine kits to increase the bore to 1100cc, they also have 11 to 1 and 12 to 1 compression piston kits. They have cam kits also that will help the breathing.
Hope this helps...