Went up the trees erlyer today and a problem started with harsh kickback and.popping and spluttering and loss of power like the choke is on ? Then hit a climb stoped and the bike was in reverse / running backwards any ideas thanks lee ?

First thing to do is pull the flywheel and check if the woodruff key has sheared.

Yea im gonna do that tomorrow .. the running backwards comes and gos was told the earths could be the prob but im thinking the woodroof key just hope its not the stator coz they **£££ thanks for the advice ill let you know how i get off thanks

Easy check is mark your flywheel at TDC (Top Dead Centre) and 23 degrees BTDC (Before TDC) and put a strobe on it. Timing should be about 17 to 23 degrees BTC.

If timing varies or is out check woodruff key and stator fixing screws.

A loose wire giving intermittent contact can cause the timing to vary and even bike to run backwards.The CDI interprets the voltage variation caused by the intermittent connection as the ignition trigger signal.

Hello,

I've had this! it was the woodruff key if its kicked back they can shear really easily.

I keep a few as spares now!

Rich

Yea the key was not to cleaver changed it and now the bike is running sweet as a nut thanks all for the advice

I hope you got on the flywheel with a torque wrench. It takes quite a lot to keep it together.

I used thred lock and impact gun seems ok what is the touqe setting for bike any ideas thanks

103ft/lbs if I remember correctly. Seems quite a lot the first time you torque one on. That's why the holder tool, I reloaded the picture of in the other thread, is necessary.

That is tight the other thing i noticed was there is no adustment for the stator others ive seen have a screw you can loosen and move side to side to advance and retard ..... Nothing on this three screws and it a solid fix no adustment any ideas thanks

Unlike a points ignition that wears and changes timing the electronic ignition shouldn't need to be adjusted. Of course this means you are out of luck as far as adjusting the beastie for fine tuning. If you look at the inside of the flywheel you'll see one or two magnets are different. That is the magnet that triggers the ignition when it passes the trigger coil because the trigger coil is oriented 90 degrees from the lighting and CDI charging coils. Because of the orientation of the trigger coil the other magnets don't generate a current in the trigger coil but the zigzag looking magnet does in the form of a pulse. A microcontroller in the CDI reads the trigger signal and fires an SCR which dumps the current from a capacitor (CDI Capacitor Discharge Ignition)into the ignition coil generating a spark. I have a CDI that I de-potted (fancy word for picked the rubber goo out of) and there are programming contacts for the CDI. Too bad they don't give you access to those as you could program your own ignition curve. Probably bung it up right proper but that's how you learn. Or at least that's how I learn.

Bike has died again massive missfire wont rev becouse of it and also big kick back and running backwords again .. the fly wheel has play in and out so im thinking the mains are dead and the play is causeing the problem any ideas thanks

This is the stator there is no adjustment on it its screw in with 3 screws solid fix but like i said the flyweel has play so thinking its looseing pick up wa you guys think thanks

Stator

Any info thanks