Bike over heating after 40 mile ride

[Ken4004]

Hi everyone just a quick update.

I have rebuilt the ignition coils as per the mod by Ash and fitted the coils back on the bike and rechecked the resistance , around 24.5 k on each of the coils so all looks good.

During my investigation released that the incorrect spark plugs were fitted so I had resistor plugs and resistor caps fitted so have changed the plugs to non resistor version so should get a stronger spark.

I have checked all the cylinders with an Edoscope looking through the spark plugs and holes and all look good except for cylinder two which had deposits of carbon on the piston head because cylinder two was not firing all the time.

Just taken it out for a run and it is pulling better, the flat spot seems to have gone , there is not a strong smell of unburned fuel and doesn’t appear to be getting as hot but the jury is still out , I might try and borrow a digital thermometer to check the engine temp after a longish ride.

Was going to take it for a longer ride but the heavens have just opened so looks like heavy rain for the rest of the day , when the engine cools down I’ll check the colour of the plugs and then decide to try and tinker with the air screws again.

Regards Ken

[Ken4004]

All plugs removed and checked, no signs of soot all look exactly the same  an bike ticks over nicely so will go out for a longer ride over the weekend and see how it goes but all looking positive.

[K2-K6]

Good news with progress. Potentially running more in equilibrium now and give better conditions for running rings in.

On that note, I'd not worry at using it up to about 7500rpm during this period. That's the torque peak and avoids "lugging" it to risk heat building exces.

My view is that the components generally don't need running in and associated care, just consideration for the rings/bores in bringing those in. That operation is related to linear speed, of the pistons, ultimately to "hone" the rings with the bore cross hatching.  These motor are so short stroke its unlikely you impinge on ideal linear speed for that action by running to the above rpm. Light throttle and let it spin with casual ease to treat it well 

[Ken4004]

Good news with progress. Potentially running more in equilibrium now and give better conditions for running rings in.

On that note, I'd not worry at using it up to about 7500rpm during this period. That's the torque peak and avoids "lugging" it to risk heat building exces.

My view is that the components generally don't need running in and associated care, just consideration for the rings/bores in bringing those in. That operation is related to linear speed, of the pistons, ultimately to "hone" the rings with the bore cross hatching.  These motor are so short stroke it’s unlikely you impinge on ideal linear speed for that action by running to the above rpm. Light throttle and let it spin with casual ease
to treat it well 

Thank you for the advice noted