Thanks for that info gggGary. Much appreciated. My bike is apparently a June 1980. Presumably it will be fine for the 7 plate conversion.
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URGENT HELP to source electric ignition for rephased motor
- Thread starter Mannyroad
- Start date
OK, so I decided to go down a different route to get me 7 frictions and 6 steels. Smedspeed machined the surfaces of the clutch hub and the pressure plate, to make room for the extra plates. Good price, so went that route. Got the EBC XS heavy duty springs in too. Just need to fill it up with oil and get it out on the road for a test, if it will only stop bloody raining here! The pic shows the difference between the original clutch parts and the modified units.
Attachments
ShaggyMech
Socal Mechanic.
Hello! I see you have fixed your timing woes on your two hundred and seventy degree motor but in my quest for converting a tx750 to electronic ignition, a 1980-1981 xs400 actually uses a 270 degree ignition timing system. Just an FYI for those that are looking for a rephased ignition.
ShaggyMech
Socal Mechanic.
The interesting thing about the xs400 ignition is it is actually a literal dual ignition module that switches which coil is fired at a 90* cam timing interval. XS650 and the TX750 have both pistons rising and falling together which creates the inherent vibration with a parralel twin. The xs400 in 1980 Yamaha switched to a one down one up piston configuration so they made a ignition pickup sensor that is 90* instead of 180* on the cam allowing it to fire the individual coil at 360* to each other since the trigger wheel is shaped like a T. But say if you had two ignition modules and set them up to fire each trip of the sensor you could fire a 270* motor actually fairly easily.
THAT is very useful.information. thanks for posting
The XS400 has a 180 crank angle.
ShaggyMech
Socal Mechanic.
Yes, if you see my next post I explain my thoughts on how one would be able to use the factory ignition variable reluctor as a trigger for a 270* motor. It has two reluctor pickups 90* out on the cam. And a trigger wheel with 2 legs 180* in the form of a T. I'm using a transmic TCI-CDI that's fully programmable with only 1 pickup but with the T shaped trigger to fire the TX750 every 360* in a wasted spark configuration. Using 2 of the same ignition box or another programable ignition box you could use both pickups to fire either side independently. Or even change the trigger wheel to accommodate the slightly different angle of ignition timing. It's all about angles. And with 2 triggers and 2 reluctors you can do alot with that.
Thanks for the clarification.
