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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?

 

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Forgot to mention, When I knew I was getting it I had a hunt round my Mum's garage for my late father's Tarpen hedgetrimmer, but it must have been the one and only thing he ever threw away...:rolleyes:

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I no longer have the hedgetrimmer, but I do have the leaflet for it and am attaching a copy.

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1 hour ago, pmackellow said:

That unit would be late 1930's,

 

I have a couple of them and one was new in 1938 to Scotney Castle in Kent.

 

Wow, I thought it would be 60's at the oldest.

 

Am I right in thinking it's a JAP engine made just for this application?

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17 hours ago, mattblack said:

Wow, I thought it would be 60's at the oldest.

 

Am I right in thinking it's a JAP engine made just for this application?

 

No, its Tarpens own two stroke engine :thumbs:

 

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Gave this a clean today, how does so much oil end up on the outside of a 2 - stroke machine :confused:

I'm erring towards getting it running and generating (with luck) and doing an 'oily rag' resto rather than repainting it.

 

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Split into it big 'lumps' today.

Looks like I need to make a puller that picks up on the starter pulley holes to remove the flywheel (at least it's keyed so no faffing around with the timing, unlike a certain other engine make...)

 

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Well, with the points cleaned and set I pulled it over with the rope and got a good spark :D

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)

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No major scoring on the bore

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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?

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

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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.

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That's a good idea about the flap wheel, I have a flexible drive so may be able to do it with a standard wheel.

 

I did wonder if the rings would be an off the shelf part.

 

The crankcase bushes seem good, with no movement that I can feel. My biggest concern is the movement between the gudgeon pin and piston.

 

At the end of the day I will be happy to get it running again, It's not like it's going to be a 'working' engine running on load for hours.

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The wear between the piston and pin will certainly be noisy but shouldn’t prevent it running. My pet hobby horse for vintage two strokes is old oil for old engines. That is don’t make up the mixture with s modern synthetic oil , use a vintage two stroke such as those marketed by Millers or Morris Lubricants which are basically a non detergent SAE 30 or 40 and have plenty of body to help with main bearing sealing etc.. I’m guessing that the mixing ratio for your engine will be 16:1.

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11 hours ago, Wristpin said:

The wear between the piston and pin will certainly be noisy but shouldn’t prevent it running. My pet hobby horse for vintage two strokes is old oil for old engines. That is don’t make up the mixture with s modern synthetic oil , use a vintage two stroke such as those marketed by Millers or Morris Lubricants which are basically a non detergent SAE 30 or 40 and have plenty of body to help with main bearing sealing etc.. I’m guessing that the mixing ratio for your engine will be 16:1.

 

You've just answered my next question...!

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Had to remove the contact breaker cam to get the crank out but there wasn't much room between the cam and the crankcase, luckily I had an old puller that I could 'modify' to get it started.

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The remains of the gaskets were well gummed on, but I remembered a trick from when I first started in the motor trade.

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...Followed by a sheet of 150 grit wet and dry laid flat on the bench with plenty of lubrication.

 

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