Hello all,

I have recently purchased a 1987 TZR 250 that has just been put back together as a on road bike from being tracked.

After each run out on it one of the spark plugs goes down.

I have reduced the in tack mix to 110mm of comp2 oil per galon of petrol, as the bike running too rich would be the first obvious diagnosis. However this does not seem to have made any difference. Still eating those plugs !

A couple of people have told me that the coils may need replacing, and if i am to replace them i should replace them with Dyna coils to also act as a performance up grade.

Apparently i need to give the supplier the ohms rating in order for them to be matched up.

The current coils are denson with a part number of 1KT - 50J0136. Yamaha does not recognise this number, there for i am unable to tell how many ohms it needs.

Can anyone help me please? Perhaps with the ohm information, or an alternitive diagnosis to the spark plug problem

Kind regards

And many thanks

Richard

more about electonics maybe