1986 K75C abandonned in the woods.

[Laitch]

I'll let you figure that one out on your own. 😁

I'll wait for the excitement of the Grand Reveal. 

[Past-my-Prime]

Sorry, I mixed up Unfit and Irreparable.  Unfit simply means it was registered without a safety present.  Bring in a safety and that's it. No insurance, no plates. You can register then as "Fit" and "Unplated".  Get your plates later.

Stay away from "Irreparable", "Salvage", or "Rebuilt" as in Ontario it can NEVER be put back on the road - no matter what you do with it.  That's why you stay away from. salvage-title motorcycles from the USA as they fit this definition.

from the MTO website:

" ... All imported motorcycles previously branded as “Irreparable”, “Salvage”, “Rebuilt” or an equivalent brand in another jurisdiction are branded “Irreparable” when registered in Ontario.  A Structural Inspection Certificate cannot be issued for a motorcycle. This means that the motorcycle will never be eligible to be driven on Ontario roads and can only be used for parts.  ... "

This is a good situation where you purchase a "parts bike" with title, even if the engine is blown, wheels are missing, everything is broken, and you use the frame from that bike (which is the "essence" of the motorbike) and then attach whatever is good from your existing "unrepairable" bike onto that.

However, all of this seems like a lot of work when you can find normal, titled K bikes for a few thousand bucks all day long. Especially if they're not running very well.

[Shinyballs]

However, all of this seems like a lot of work when you can find normal, titled K bikes for a few thousand bucks all day long. Especially if they're not running very well.

"A lot of work" is what we put in to save a few thousand dollars, which can be used to get better parts for the café build.

[The Mighty Gryphon]

It's good to hear that you were able to get a bill of sale from the owner of record, now you have a bulletproof legal transfer.  You mention that the police would seize and destroy it.  Man, it would really suck if that happened after you did the build because you didn't have the proper transfer of ownership.  DMV people can be royal d***s on a good day.  I'd hate to be there when they're in a bad mood.

[Shinyballs]

So the "dude" decided to start work on his lost and found K75C. He bought a few measuring tools to determine if the cylinders are round and straight (not tapered). They are straight but slightly oval, according to the cheap gauges he bought, so they might need to be bored. Waiting for the machine shop to get back to us on how the cylinders are.

If the cylinders need to be bored, we need new oversized pistons. The dude wants to turbo the bike so forged pistons might be preferable.

Anyone know where to get oversized pistons? Or if pistons from a totally different bike would work? We would also need new rings.

We started searching the universe but if someone has a lead, it would help tremendously.

[AtLarge]

Good thread with a happy ending. Best of luck to you both. 

[Chaos]

Don't hear about reboring a K bike very often, probably because decent used engines are cheap and the cylinders have that Nikasil coating.

[The Mighty Gryphon]

Keep your fingers crossed that you don't need to bore.  My understanding is that the cylinder bores are aluminum with a Nikasil coating.  Once you bore through the coating you are into aluminum alloy which isn't going to wear very well. 

The good news is that the coating is so tough that it's unlikely they are actually ovalized or tapered. 

[jbt]

You can't rebore cylinders on these engines. Furthermore, you won't find oversize pistons, you would have to buy custom made pistons and find a company who is able to coat a new nikasyl layer on the cylinders.
That would cost more than a perfect condition K75.

If the cylinders are OK and you want a turbo on it, you should replace the pistons by K100 pistons, that will decrease the compression ratio.

[frankenduck]

Several years ago I chatted with a German guy from the LA area who said that back in the day he'd rebored a K75 to 900cc.  Didn't get any details from him though.

I own an 86 Lufty turbo K75C. It doesn't kick in until above 4,000 but it rips pretty well after that. Smoked a guy on an R1150 going up a long steep hill one day. He's probably still wondering how a K75 did that to him.

It also has Lufty "high-performance" cams which give it more oomph in the lower RPMs. More useful than the turbo if you ask me.

[jbt]

I have doubts about the 900cc K75;
Technically,  you can rebore the block from 67 to 70,5 mm, but no more: the cylinder wall is then too thin (this explaining the oil consumption of the K1100, because of the deformation of the cylinder)
That will give a 819cc engine capacity.
To get a 900cc, it would be necessary to increase the stroke from 70 to 76,8. That exceeds by far the K1200 stroke (75mm) , I wonder how it could be possible to use such a crank with big rod angles in the K engine block.
Financially, of course, it's nonsense : if reboring and coating cylinders is almost affordable, casting and machining a new crank costs more than a new K75 did back in the days.