Kawasaki KH 125 Spark plug easy fouling

[glosoli]

Hello there,

I've been having an issue with my bike for a couple of months now where the spark plug is fouling very quickly, it's gotten to the stage I have to clean it every morning so I know it won't cut out on me going to work (and I only drive 5 miles every day).

At the moment i'm using a BR9ES spark plug, and I know the BR8ES is recommended. I have ordered some of those sparkplugs from the internet today and am just waiting for them to arrive, but even with my old BR8ES it was still fouling very quickly

So I think it's a oil/fuel mix problem.

Can anyone recommend me some tips on how to adjust the oil intake so that it doesn't foul so easily?

Many thanks

[stinkwheel]

You'll need the workshop manual. If it's like every other stroker of that era I've worked on, there will be a line on the oil pump pulley where the throttle cable attaches which you line up with another mark when the throttle is held fully open by adjusting the tension on that branch of the throttle cable. There is also sometimes a second mark for setting oil delivery at idle where you adjust a stop for the pulley.

This is well and good for an oil pump in normal working order but you're working on the assumption that your pump puts out a particular amount of oil when at that mark. I've also seen a technique where you bung some pre-mix in the tank for a temporary measure, detach the oil line and count the number of drips of oil per minute at a certain rev speed. This is more of a fiddle but takes the uncertainty out of it.

Not sure where you'd find out that drip rate though, might be in the manual, might not.

EDIT: Also, doing only 5 miles every day may be part of the problem. The engine will be barely getting up to working temperature and the oil wont be burning off fully. I'd suggest going out for a more prolonged thrash periodically wouldn't be a bad idea to let it clear any carbon and oil deposits out.

EDIT 2: Your exhaust probaly needs a de-coke by now if you're fouling plugs that regularly.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.