It was the cdi unit. Fitted a new one (2nd hand) and she fired up straightaway. cheers for the help Phil
phil
March 2010
well the cdi is not really testable unless you have a manual thst gives you an ohms values reading for it.the pulse coil can be checked if its working by getting an l.e.d and wiring it to it.if it has 2 wires then try the led on it around both ways and see if the led flashes a bit when you turn the engine over.yiou will need to try both ways as an led is a diode and will only ever light up around one way.if it has one wire then put one of the led wire to it and the other to earth try both ways as before.the seondary ignition coil should have an earth to one of the lt leads and a alternating live/neutral to the other one.you really need a power probe to check this.the ignition switch can be disconnected and then try to push the quad a bit in gear to see if the plug sparks while its resting on the head or similar metal part.now does this quad have a switch on a brake that has to be operated to make it start usually like a locking foot or hand brake that requires a lever to be set to hold the brake on to start it up.and does it have a rip cord switch on the back of it to ?i have also seen quads that have a tilt sensor fitted so they cut out when they are upside down ,but these tilt sensors go wrong and send the kill signal to the cdi even when its up the right way.
adam bike doctor
March 2010
Kill switch works as the bike will not turn over when it's off . The engine is turning over fine just no spark and the plug is getting wet when replaced in the cylinder head. How can i test the other components? cheers .
phil
March 2010
kill switches,ignition switch the the trigger coil/pulse coil then the cdi unit.these are all possibilities.in the right order.i take it youi have tried another ht cap/as these do play up.also the primary ignition coils go wrong.
adam bike doctor
March 2010
I tried another plug and there was still no spark so the coil was my next step.
phil
March 2010
Why did you change the coil?Have you tried working from the plug first,then the cap,then the lead i.e backwards from the fault instead of starting from the middle.
howtomendit.com for free repair help, information and advice.
