help needed..!

Message

alan child · #1 Post by **alan child** » Wed Feb 22, 2012 4:23 pm

hi all,i have a problem,just rebuilt my engine new cranks,rebores pistons etc,tryed fireing it up but ive got no spark,ive got new coils,plugs,caps,leads and the stator been rewound,and all the readings were good,so i thought cdi is the problem so ordered a new cdi which arrived today wired it up and guess what still no bloody spark.ive had a llok at the wireing but its hard to see when its all taped up,ive checked the kill switch to..!would there be something i didnt do right when putting the engine back together,all the punch marks allined,(weather that would matter for sparking) iam propper lost here and nearly lost all me hair too...

any suggestions would be very helpfull

Dubsey · #2 Post by **Dubsey** » Wed Feb 22, 2012 4:32 pm

Ive had a sidestand switch cause all sorts of issues
try shorting it out
at the very least it will eliminate that

1601pete · #3 Post by **1601pete** » Wed Feb 22, 2012 4:38 pm

Alan, I'm no electrical expert but have you checked the stator pick up / connection.

I think this generates the pulse to activate the circuit to spark.

Even though you have some new stuff I would run through the checks in the manual for the ignition circuit.

Can't remember if the neutral switch affects the ability to start (eg has to be in neutral to start)

I'm assuming you have a multimeter

Cheers

Pete

alan child · #4 Post by **alan child** » Wed Feb 22, 2012 4:47 pm

hi pete ive checked the pick up readings,and all other readings,and there within the manaul specs,
dubsey,ive never had a side stand switch so its not that, thanks for the suggestions..anymore..

1601pete · #5 Post by **1601pete** » Wed Feb 22, 2012 4:50 pm

Alan.

Not sure how the manual says to check the pick up coil. Does it involve rotating the stator and seeing there's a change in readings when it comes past the pick up point?

mollydee · #6 Post by **mollydee** » Wed Feb 22, 2012 4:57 pm

Have to ask the obvious, sorry, but the do powervalves cycle etc ?

molly

1601pete · #7 Post by **1601pete** » Wed Feb 22, 2012 5:00 pm

This might help

http://www.dansmc.com/cdiignition.htm

mollydee · #8 Post by **mollydee** » Wed Feb 22, 2012 5:07 pm

1601pete wrote:This might help

http://www.dansmc.com/cdiignition.htm

thanks Pete, thats a great write up.

molly

alan child · #9 Post by **alan child** » Wed Feb 22, 2012 6:17 pm

pete, thats a helpfull write up there.i was checking the readings from the pick up wires w/g w/r.thanks for ur input..

alan child · #10 Post by **alan child** » Wed Feb 22, 2012 6:22 pm

mollydee,yes the p/v are working fine.that shouldnt interfear with no spark thou,would it...?

1601pete · #11 Post by **1601pete** » Wed Feb 22, 2012 6:25 pm

did you get a pulse from the pick coil?

mollydee · #12 Post by **mollydee** » Wed Feb 22, 2012 6:26 pm

alan child wrote:mollydee,yes the p/v are working fine.that shouldnt interfear with no spark thou,would it...?

no not at all, just wanted to make sure that in the heat of the battle something simple did not get overlooked, like a good ground etc.

molly

alan child · #13 Post by **alan child** » Wed Feb 22, 2012 6:49 pm

yes pete,i got a ohms reading eairler from the pick up,cant remember what it was it was in the morning i done it..maybe i might hav to check over the wireing with a fine tooth comb

Andrew · #14 Post by **Andrew** » Thu Feb 23, 2012 10:13 am

Hi Alan

It might be a long shot, but can you get your hands on a scope meter? Because you can then check the pulses going into the low voltage side of the HT coils. and it they're good, you only need to check HT leads, supressor caps and plugs. If the pulses are not there, look again at the CDI (assuming the pick-up coil pulses are getting to the CDI box)

Is it no spark on ALL 4 plugs???

alan child · #15 Post by **alan child** » Thu Feb 23, 2012 1:09 pm

thanks all,for ur help,today i took the loom off,put a few new conenctors on,and charged the battery again,and what you know a spark appears,so connected everything back up and on the second kick she fires up,finaly so im happy as larry

and the sound is oh sooo