Hello Folks,
My TR1 doesn't want to run on the rear cylinder. I have replaced the plugs with new, and replaced the leads. There is a nice, big, fat, bright spark comes off the lead to earth when I run the motor with the lead pulled off the plug. As I reconnect the lead it then runs on both cylinders for a  second as the spark arcs from the end of the lead to the top of the plug, but when I properly connect the lead to the plug it goes back to running on only the front cylinder. I have the same plugs and leads on both cylinders (8mm double insulated braided silicon). Any suggestions?

Cheers
Richard

Hello Richard,

Welcome onboard.
I must say, your problem does sound very strange. I never heard of anything like
that (whereas I am not exactly experienced with electrics).
Anways, did you try to change the plug connctor? If you saparate the connectors from the cables
and switch front with rare, you might eliminate that as a source of the problem (or, in the best case,
confirm it).

Good luck
OLa

hi Richard,
maybe one of your ignition coils is damaged. There is a spark, but no power.
First you´d change the wires of the coils and look at the reaction?
If the problem then is on the front cylinder, you´d better buy new coils. ::)

Cheers, Olaf
(hopefully did understand you well)

I'd rather think that the coils are in a quite good condition, if they are able to produce a fat spark if the lead is disconnected. I believe Richard has a problem with a to lean or to rich mixture, or with fouled plugs. Then the normal voltage that arises betwen the electrodes of the plug, befor the spark occurs, is to low to ignite the mixture. If he pulls off the lead for a centimeter or a half, the voltage arises to a higher level before a spark jumps over from the lead to the plug, and then between the electrodes of the plug, which gives a stronger spark there (or a spark at all on an otherwise fouled plug)!

Sometimes when my TR1 only ran on one cylinder, i pulled the lead of the failed cylinder a little bit, and the cylinder just started. After a minute or so, the plug got hot a little bit and was "burnt free", and i could put the lead back.

Bye,
Georg

Hello Everyone
Thanks for the helpful suggestions, I checked the plug on the rear cylinder and is is badly carbonised (running too rich).
I'll try a float level adjustment and see if it improves and also check the operation of the choke.

Cheers
Richard

Well i had an simular problem with an car engine the failure was an spark plug in a runing engine may bee a high pressure that will kill the ignition spark i took a new one and it was fixed  :)