I'm splitting my time riding & tuning on the two bikes with the recently modified (reed valve /window piston & third port performance upgrades) engines. It's going well; the one in the Skyhawk frame (GT-5 38 mm stroke) I feel confident to wind out & it likes it, as do I! So I'm calling it done and very good.
The motor in the X-celsior Schwinn is the 40 mm long stroke & the first one of these I've owned. The mods on this motor closely mimic those on the 38 mm motor, but it's fought me along the way. Over the last two days I've ridden it for several hours interrupted with tuning and cooling breaks, and assorted adjustments etc. Even with all this riding the motor stills feels tight so I really haven't run it up past 6,000 rpm range yet. It has good torque through the lower & mid range band, starts well cold or hot, but not nearly as easy as to fire up nor as lively as the GT-5. I've not put as many hours of riding on this engine as on the first one completed, so I'm being patient.
I've only one real riding complaint on the Schwinn and that is a sheet metal buzz at about 4,500 rpm. Since fender and chain guard etc. have been ruled out that just leaves the fuel tank as the source of the buzz, but I'll also be looking at the engine mounts as the main cause.
It's still just about having fun and our weather here is & has been awesome, very Fall like with forecast of more to come...so I'm riding as much as possible every day. Best and coolest Summer weather ever recorded here in Indian Territory also one of the wettest Summers. Green, cool and beautiful. Rick C.
The motor in the X-celsior Schwinn is the 40 mm long stroke & the first one of these I've owned. The mods on this motor closely mimic those on the 38 mm motor, but it's fought me along the way. Over the last two days I've ridden it for several hours interrupted with tuning and cooling breaks, and assorted adjustments etc. Even with all this riding the motor stills feels tight so I really haven't run it up past 6,000 rpm range yet. It has good torque through the lower & mid range band, starts well cold or hot, but not nearly as easy as to fire up nor as lively as the GT-5. I've not put as many hours of riding on this engine as on the first one completed, so I'm being patient.
I've only one real riding complaint on the Schwinn and that is a sheet metal buzz at about 4,500 rpm. Since fender and chain guard etc. have been ruled out that just leaves the fuel tank as the source of the buzz, but I'll also be looking at the engine mounts as the main cause.
It's still just about having fun and our weather here is & has been awesome, very Fall like with forecast of more to come...so I'm riding as much as possible every day. Best and coolest Summer weather ever recorded here in Indian Territory also one of the wettest Summers. Green, cool and beautiful. Rick C.