mattblack

Rather than honing the bore which implies stones and the removal of metal , I’d clean it up with a flap  wheel.  The Cords piston ring people used to sell various sizes of what appeared to be standard 80 and 120 grit flap wheels on extended spindles to reach down the bore and I’ve subsequently used standard diy wheels with an extension shaft that I think came with some wood boring bits. 
Clean the bore as best you can and offer up the rings to it and see what gaps you have. If you need new rings you may find that Tarpen economised by using the same sizes as another mass produced engine manufacturer but if push comes to shove there are a couple of firms that will make rings to order - but at a price!
As you are probably aware, with a two stroke you not only need compression in the accepted sense but also sufficient sealing to transfer the mixture from the crank case via the transfer ports. That takes us to crankcase sealing  including , if applicable, the joint between two halves, the main bearing seals and the joint between the case and cylinder barrel. Two strokes are equally sensitive to crankcase integrity as they are to cylinder compression.

Well, with the points cleaned and set I pulled it over with the rope and got a good spark 
So I delved in deeper...
 
Piston has some damage to the edge of the crown, and there is a lot of play in the little end (between the piston and gudgeon pin)

No major scoring on the bore

The head gasket was this homemade paper affair and not doing much, I would imagine that I will have to get one made unless I can lay my hands on some copper sheet and do it myself?

 
Is it worth (or even a good idea) to hone the bore if I re-use the same piston rings?

Well, with the points cleaned and set I pulled it over with the rope and got a good spark 
So I delved in deeper...
 
Piston has some damage to the edge of the crown, and there is a lot of play in the little end (between the piston and gudgeon pin)

No major scoring on the bore

The head gasket was this homemade paper affair and not doing much, I would imagine that I will have to get one made unless I can lay my hands on some copper sheet and do it myself?

 
Is it worth (or even a good idea) to hone the bore if I re-use the same piston rings?

Not very pretty, but it worked.



 
I will clean and set the points and check for a spark and take it from there.

Not very pretty, but it worked.



 
I will clean and set the points and check for a spark and take it from there.

Gave this a clean today, how does so much oil end up on the outside of a 2 - stroke machine 
I'm erring towards getting it running and generating (with luck) and doing an 'oily rag' resto rather than repainting it.
 

You sir, are the master of understatement 

This is the new project I mentioned in another thread. It's a Type 40, 110V DC, 400W. It appears to be complete but obviously hasn't run for a while. The first job will be be a session with the degreaser and pressure washer. Can anyone give an approximate year to it?
 

Well, I'm calling this (sort of) finished... I screwed it to a bit of scrap MDF as a temporary measure to run it, and much to my surprise it started on the third kick. However, it was 'hunting' badly and after playing with the governor setting with no real improvement I called it a day. Yesterday I had a closer look at the carb and checked the manual re: setting and discovered that the mixture screw is missing! Looking at the 'before' photos it was missing when I got the engine. I have emailed Meteens so hopefully I will be able to get it running properly. If so I will try to post up a video.
 

Well, I'm calling this (sort of) finished... I screwed it to a bit of scrap MDF as a temporary measure to run it, and much to my surprise it started on the third kick. However, it was 'hunting' badly and after playing with the governor setting with no real improvement I called it a day. Yesterday I had a closer look at the carb and checked the manual re: setting and discovered that the mixture screw is missing! Looking at the 'before' photos it was missing when I got the engine. I have emailed Meteens so hopefully I will be able to get it running properly. If so I will try to post up a video.
 

Slowly coming together.

Made a bit more progress.
 
The carb was a bit crusty inside. looked like it may have had water sitting in it but it cleaned up OK.

 
coming back together.



 
Cleaned up the tank and cowling and filled the dents.

 
 

Slowly coming together.

Slowly coming together.

This lives at work, it hasn't moved in the 9 1/2 years that I've been there. I'm not sure if the deck is still around or went in a scrap clearout.



 

This lives at work, it hasn't moved in the 9 1/2 years that I've been there. I'm not sure if the deck is still around or went in a scrap clearout.



 

Got a bit more done over the last few days.
 
Head decoked and valves ground.

 
Mag backplate cleaned up and new oil seal fitted.


Block and head all cleaned up and painted.

This lives at work, it hasn't moved in the 9 1/2 years that I've been there. I'm not sure if the deck is still around or went in a scrap clearout.



 

Picked this MK 25 HS up yesterday, another ebay purchase. Exhaust and flywheel cover missing but for £15... 
 

This lives at work, it hasn't moved in the 9 1/2 years that I've been there. I'm not sure if the deck is still around or went in a scrap clearout.



 

This lives at work, it hasn't moved in the 9 1/2 years that I've been there. I'm not sure if the deck is still around or went in a scrap clearout.



 

This lives at work, it hasn't moved in the 9 1/2 years that I've been there. I'm not sure if the deck is still around or went in a scrap clearout.



 

I spotted this in this month's 'Street Machine' magazine, I know nothing about it apart from it was photographed at a drag race meeting at Sywell aerodrome, and I'm guessing that's a 4 cylinder bike engine and 'box... (is that a Honda logo?)
 

I spotted this in this month's 'Street Machine' magazine, I know nothing about it apart from it was photographed at a drag race meeting at Sywell aerodrome, and I'm guessing that's a 4 cylinder bike engine and 'box... (is that a Honda logo?)
 

Oh well, it has survived about 10 years of me hacking away at it in November, and in my defence it's really the O/H's allotment...
 
Anyway, back to the important stuff...
 
I was in 2 minds whether to strip the engine down further, but as I want to give the block a good clean and check the bearing shells I decided to at least take the piston/conrod out. Then I decided to take the crank out so I could change the oil seal, which was when the fun started... the bearing stayed on the crank, so it wouldn't come out the other side without taking the camshaft out... which wouldn't come out without taking the governor out...
 
Piston rings rings look good, I hope my piston ring compressor goes down small enough.
 

 
Shells and crank are good as well.
 

 
Block ready for a good clean and paint.
 

 
Will sort out a shopping list for Meetens next...