1980 Montesa 123 No Spark - Sorted!

1980 Montesa 123 No Spark - Sorted! Rate Topic:

#1 JohnH

Member

Group: Members
Posts: 55
Joined: 20-February 08
Location:Tewkesbury
Bike:Montesa 123

Posted 29 March 2010 - 08:19 PM

Ok then I am rebuilding my 1980 Montesa 123 and i have replaced the points, condensor and all the wires from the stator. I replaced each wire as I took one off so I am pretty sure that it is wired correctly. I set the points and kicked the engine over - no spark. So i set about setting the timing using a dial gauge and ohmeter. Connecting one probe from the ohmeter to the single LT wire going to the coil and the other to an earth I get a constant beep. I tried all of the other 3 wires and got the same constant beep, I also tried different earth locations with the same result and still no spark.

Any ideas what I could be doing wrong?

Cheers

This post has been edited by JohnH: 10 April 2010 - 07:10 PM

#2 MotoVintage

Advanced Member

Group: Members
Posts: 316
Joined: 10-March 08
Location:Texas USA
Bike:Montesa
Club:CTTA

Posted 31 March 2010 - 06:15 PM

ohm reading on the source coil? try a known good ignition coil

This post has been edited by MotoVintage: 31 March 2010 - 06:16 PM

Christopher Collins

#3 Stork955

Advanced Member

Group: Members
Posts: 538
Joined: 14-March 06
Location:Tassie! - Australia
Bike:Beta Evo 250 2010
Club:Tasmanian Motorcycle Trials Club

Posted 31 March 2010 - 07:43 PM

Gday, did you give the points a clean before fitting? Often they have a film of protective oil/stuff on them when new, and you do need to give them a clean with some solvent first (Just on the contact area) Also, make sure you have a small dab of grease on the rubbing block too- not too much though!

Cheers,

Stork

#4 IKB

Advanced Member

Group: Members
Posts: 268
Joined: 11-October 04
Location:Teesdale
Bike:Gas Gas
Club:Richmond

Posted 01 April 2010 - 06:11 AM

I think you need to disconect the source coil when setting the timing with a multi meter as the coils have a low resistance. Also there are 2 source coils you can use for the spark as I had no spark on my 200 and after specking to Bradford Ignitions he sugested I try the other coil and instant spark. Unfortunately I cant remember which coil was which,I think they both have similar size windings.
You could give bradford Ignitions a ring or have a look at www.uk-motoplat.com.

Ian

#5 JohnH

Member

Group: Members
Posts: 55
Joined: 20-February 08
Location:Tewkesbury
Bike:Montesa 123

Posted 06 April 2010 - 07:14 PM

Thanks for the advice fella's, I now have a spark. Ihad to take the engine out of the frame and clean up the mounting points so that there would be a decent earth. Found this out from Southwest Montesa.
Cheers