Hi
I have just bought a 1993/4 ish climber as a non runner.
Some one has been in at the disc valve which was out, but I have
set it as per the www.rotax.co.uk uk parts list instructions (I think).
The previous owner has apparently changed the piston and rings
due to low compression. The bike now has very strong compression
maybe a little more than I would expect.
I have checked over the carb and this looks to be set up just about right.
105 main jet and needle clip second from the bottom.
I have tried the old squirt wd40 in the carb mouth to get over any carb problems.
(I know this sounds a bit daft but its worked for me as an indicator for many years)
This only leads to the occasional strong back fire through the carb or exhaust.
This makes me think its an ignition problem.
I have checked the rotor and stator, the ignition pickups are aligned
at TDC give or take a smidgin.
There is a very good spark but it almost seems to come too often
My feeling is that the engines mechanicals, fuel are fine and its an electrical fault.
I don't have a wiring diagram however the CDI is marked with wire colours three of which (brown, white, red )are connected
the fourth (black) is empty but I guess this is for the kill switch and not required.
Does anyone know if CDI will fail and still spark?
I would be grateful of any advice or pearls of wisdom.
Thanks
Jim