So back when I was 17 and bought the first seca, my friends dad looked it over at his mechanic shop and told me someone before me had put the wrong spark plug in one of the cylinders and it was cross threaded.
We just put the right spark plug in and I rode it for a few years afterwards.
The bike never felt as good or as strong as the other Seca my buddy had and I have now inherited.
When I was tuning my carbs by temperature of the head pipe. I remember that 1 cylinder was always cold. Like 150° cold no matter what adjustment I made...
Until today I didn't put 2 and 2 together.
I'm gonna do a compression test on the cylinders but I would like to retread/tap the spark plug to the correct pitch again so avoid any metal shavings getting in there everytike I change plugs.
Does anyone know what the proper spark plug thread size and pitch is for our bikes??
