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Hi, I made the spark plug for my Rumely tractor, I used Corian for the insulator and I used nickel silver 1/16 rod for the electrode and there is no sign of any erosion so far. I seem to remember from way back that conducting the heat away from the central electrode is more important than the...

Beware, taps aren't always the right size. I have a 3/8 x 40 plug tap [UK made] that is definitely undersize. I recently bought another set of 3 taps of this size and they are all slightly different overall diameter. To get a thread near enough the correct size I had to grind down the second...

Hi, I've made some castings in brass and they had porosity problems, I've learned since that the solution is to add some phosphorus in the form of a stick of copper/phosphorous brazing rod which is commonly used in brazing joints in refrigeration applications. This stuff is cheap and I've got...

I found that I couldn't get good compression on my Rumely until I re-machined the seats to a very narrow edge, no more than a few thou. I lightly lapped them in with metal polish. The compression has improved a lot since I've done more running. Oh, and I chucked the valves in the 4 jaw...

I built a great rotary table using the rotating base from my machine vice which i never use. I made a worm gear 5 inches diameter with about 200 teeth which I free hobbed using a tap. The table I made from a 7 inch diameter slice of freecutting steel. The whole thing is only 2 inches high and...

Thanks guys, I'm very new to trying to make videos. I couldn't get over how long they take to upload to Youtube, that one took 6 hours!

Some explanation;- The upper of the two shafts you can see has two pinions on it both of which can slide. In the position shown the engine is in neutral. The two brass pieces are the selector forks and are moved by the two gear levers. If the right hand gear is slid to the left it engages...

Here is a photo of the gearing under the engine.

Thanks Shopshoe. I rather like it unpainted as well. The problem with painting it would be it's too shiny and un-tractor like, also I can't get the Rumely decals from anywhere.

Hi Everyone, I've got the tractor more or less finished. Here's a video of the first run this week.

I'd like to know the answer to this as well, I notice my Rumely tractor cylinder barrel is going rusty despite putting Central heating rust inhibitor in the water. Would it be an idea to use some sort of oil as a coolant?

I made the body on my spark plug from Corian [worktop stuff]. You can stick it with superglue and seems to hold fine.

Hi, I would like to know more about this. How does an ignitor work?

Yes it is, they are Salamander crucibles I used. They were great to deal with. They actually sent me the wrong size ones the first time I ordered, they just told me to keep them and they sent the right ones! I was very happy to do that.

I'll let you into a secret. Crucibles are much cheaper if you buy them directly from Morganite and buy say 3 at a time.

Hi Willy, thanks for the reply, The round part with the lever is a slide which covers the air inlet holes to provide a choke for starting. Westbury says most people make the inlet too large. The inlet passages into the cylinder are only 8mm . I've now made another throttle slide with holes...

Hi Folks, here's a video I made showing the details of my tractor engine. It's better quality than the last one because I got myself an action camera. The editing is more difficult than I thought though.

Thanks guys, I think it's burning oil from the crankcase. I used an O ring seal on the piston but I suppose the first one could have become worn by the bore not being polished enough. It seemed to give a perfect vacuum seal when I tried it. I can easily enrich the fuel, I'll try that.

Thanks everybody. The running isn't right yet, it dies if I open the throttle. Any ideas as to why that could be please?