Not firing on 2 & 4: I do not know what it is!

Thanks tibor. I guess I will go to the Yamaha stealer this weekend.

 

One of the sneakiest problems that can be treated pretty easily is:
The "erosion" of the Spark Plug Wire Core at the end due to "Pulling-off" the Plug Caps.

The Core gets eaten-up and a major resistance can form.

Trimming-back the ends might not work because any shorter and they wont reach.

If you don't want to do the "Coil Surgery" and replace the Wires, ... Insert a short length of bare Solid Core copper wire up into the end of the Plug Wire. Put a "Double" 1-Inch collar of Heat Shrink on the Plug Wire.

Screw the Plug Cap in and make good contact.

 

Hi all :wink:
The pick ups may be the way to go for you, :idea: i had the same problems with my 1100 maxim, i checked evarything you have checked, decided to look at evarything that had a current, ended up at the pick ups, on close inspection i noticed a small whole in one of then so i replaced them, this made it better but didnt resolve the problem, the firering became more random, went fron 2 to 4 to 3 and so on, the last thing left to check was the ignition unit, i was told that they either work or they dont work at all but these was just words, i took a unit of a friends xj 1100, she roard loud and ticked over a treat, all cylinders was firering and she was running better than i remember she used to run last year. im not sure if the 750 runs on the same pick ups ass the 1100 maxim, but i think it does have a ignition unit that is allmost the same, maybe mounted under the seat.
I hope this helps you, they are expensive to replace, mine was second hand and cost £110, i think thats about $170
I hope you get it working soon :roll: :roll: