Xs7501978 said:
I have an xs750 now will there be a big power loss with the 250cc loss?
Well, the rated horsepower for the XS750 is 64, and the rated hp for the CX500 is 50. In reality, they're both likely far less at the rear wheel. 14hp difference in specs, probably 2-3hp more loss at the rear wheel on the Honda due to the shaft drive. That said, the CX500 has plenty of power for cruising and passing, and an easily attainable 105mph top speed. (It's geared loooow!) What you lose in horsepower you'll gain in reliability. CX500s are 200,000 mile motors. XS750s were 20k mile motors. They had problems with primary chains stretching, cranks going south, leaking base gaskets, exploding gearboxes (especially 2nd gear), and all the standard Yamaha electrical problems from that era. (Low quality wiring that corrodes heavily inside the insulation)
For the CX500, once you have the bike sorted out maintenance is minimal and issues are few and far between. If you do need to do major work on the bike (cam chain, starter clutch, or stator), the whole engine (with radiator, headers, and collector attached) drops strait down onto the ground after removing six bolts. (Seven for CDI models) The back cover can then be removed (with radiator and exhaust still attached) and those parts replaced without even moving the motor off the jack. To replace a head gasket, all you have to do is remove the gas tank and one coolant pipe, and the head comes right off. SUPER easy. Valves can be adjusted in 15 min without removing a single part other than the valve and inspection covers.
If you want more power, the CX650 (actually 673cc) motor will bolt into the 500 frame with some modifications. That motor is rated 65hp from the factory.
Charles.