I bought this 1987 K75C off a mate as a restoration project and for this year's Scrapheap Adventure Ride. Non-goer of course, in fact nothing worked but it would turn over if the starter solenoid was shorted across the terminals.


Nothing seemed to be too far wrong so I set about disconnecting and reconnecting things. This worked, it turns over, has lights etc and spark. Radiator has a pinhole but I've got another one coming so all good there.

Next step was to get it to run. New el-cheapo injectors from our friends in China ($48 for a set of 6). Still wont go. Sit and have a look for a while. Aha - spark plug leads are the wrong way around. Fix that and it goes - sort of. Its running on about 2 1/2 cylinders. No. 1 sort of backfires to the point that I can see flame around the intake where the arrow is on the photo below. The rubber is split which probably doesnt help. I'm wondering if the intake valve on this cylinder is sticking a little and not closing fully. It seems to run ok at around 2000-5000 but that might be an illusion. Any suggestions??

Check valve clearance, normally it wears bery slowly but has to be adjusted every 100 000 kms...
It won't run smoothly if the intake rubbers are worn. Same thing for the S rubber pipe between intake and coils.

I should have mentioned - it has 85k km on the odo. Based on the general condition, I'd say that's about right. The plan is to dismantle the thing and do a resto so many things will get fixed or adjusted as I go, including the valve clearances.

jbt wrote:It won't run smoothly if the intake rubbers are worn. Same thing for the S rubber pipe between intake and coils.

jbt, excellent suggestion.

Rockman, you might ask why?
Our bricks are ageing, regardless if you run them /high mileage/or let them standing in a barn /low mileage/.
So does the rubber.

After 35 years, it is not too bad an idea to replace all the rubber parts on the intake side.
Everything is still available /afaik/.
Good luck and lots of success

Yet another one Phil   ? 

Good onya 
Hopefully will come together for you eh ?

charlie99 wrote:Yet another one Phil   ? 

Good onya 
Hopefully will come together for you eh ?

Yep, bad dose of K Pox as I've had over a dozen of them so far. This one will be ok in the end. Pull it apart, find out what isnt right, then put it back together. Simple..

It will never run right. You bought a bike that was designed and built in the northern hemisphere. The fuel molecules will always spin in the wrong direction (like your toilets) resulting in suboptimal performance.

duck wrote:It will never run right. You bought a bike that was designed and built in the northern hemisphere. The fuel molecules will always spin in the wrong direction (like your toilets) resulting in suboptimal performance.

I'll ride it backwards then . That'll fix up those counterspinning molecules.

Rockman wrote:

duck wrote:It will never run right. You bought a bike that was designed and built in the northern hemisphere. The fuel molecules will always spin in the wrong direction (like your toilets) resulting in suboptimal performance.

I'll ride it backwards then . That'll fix up those counterspinning molecules.

Since you guys ride on the wrong side of the road that might help too.