Dustmeoff
XS650 New Member
I'm about to buy a 1975 xs650 and I plan to rephase the engine soon after. I've read all about the different ignition solutions and I have these questions.
If I stick with points for 277, is there enough space between the dual points to shift one 41.5 degrees? If not, that means the points solution is to run single point and a dual lobe ignition cam. That would give one wasted spark halfway through one intake stroke. Will this backfire? Harley has apparently done it with their older bikes which are effectively a 278 phase engine.
Second question - has anyone drilled the alternator rotor on a tci bike to add a magnet? I read a service manual for the tci system that said it references the time delay between the magnet passing the first and second trigger coils to determine advance. this makes me think that if there was enough dwell, you could add a magnet to the rotor and keep the fatory timing curve with a wasted spark setup.
Last question. I have a wr450 which uses a 12v powered cdi ignition with an advance curve very similar to the xs650. Has anyone heard of using the wr ignition module and pickup with a steel ring on the crankshaft? Either one ignition unit with 2 steel teeth on the rotor and run a wasted spark ; or two ignition units/2 coils/ 2 pickups/ 1 crankshaft tooth with stock wr advance curve.
Mike
If I stick with points for 277, is there enough space between the dual points to shift one 41.5 degrees? If not, that means the points solution is to run single point and a dual lobe ignition cam. That would give one wasted spark halfway through one intake stroke. Will this backfire? Harley has apparently done it with their older bikes which are effectively a 278 phase engine.
Second question - has anyone drilled the alternator rotor on a tci bike to add a magnet? I read a service manual for the tci system that said it references the time delay between the magnet passing the first and second trigger coils to determine advance. this makes me think that if there was enough dwell, you could add a magnet to the rotor and keep the fatory timing curve with a wasted spark setup.
Last question. I have a wr450 which uses a 12v powered cdi ignition with an advance curve very similar to the xs650. Has anyone heard of using the wr ignition module and pickup with a steel ring on the crankshaft? Either one ignition unit with 2 steel teeth on the rotor and run a wasted spark ; or two ignition units/2 coils/ 2 pickups/ 1 crankshaft tooth with stock wr advance curve.
Mike