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I felt sure I posted this before but it did not show up so here it is again. All the bends were done freehand. The tubing is all hard copper from 4mm to 10 mm. I annealed the tube at the apex of the bend by heating and quenching, bent a few degrees, and repeat - anneal bend anneal bend - until...

Managed to do a bit of plumbing between tax reports.

How about something like this. https://www.amazon.com/Manual-Reset-Circuit-Breaker-Automobile/dp/B09SQ3JGVF?th=1

Just in case anyone was wondering about the progress of this. Hobbies take a backseat for a month or two. It is tax season in the Czech Republic and working with my accountant wife takes priority. Back soon.

I know this is an old video and Bryan has adjusted the valve timing but I believe at that time he had one side firing. He also changed out plugs, ignition to confirm OK. Just me but I don't like anything ''Tight'' on a small engine, especially around the valves, as they need to move quickly...

It's an old box spanner, possibly plug spanner. Could be any type of steel, probably cheap. Certainly not cast.

Have you checked the fuel to both cylinders? You now have twin carbs.

Lovely engine. What purpose does the design serve other than taking side load off the piston.

Welcome Dieter. Some real quality work. What is the generator in you photo's is it a KIt or home made?

Managed to get a bit of time in the workshop today. I made an exhaust pot and a bit of plumbing out of some odds and sods of material. Probably a bit of overkill but filled it lightly with some stainless steel scouring pad. Pleased with the result. Fits like a glove.

Slight update to the demand valve.

I don't know how long this process takes but you are probably taking too much time to score and break. Glass starts to ''heal'' after scoring and the process should be fairly quick. Seconds not minutes.

I wanted to make the demand valve look more like a valve than the typical square box. Relieving the main block around the ports would be nice. Unfortunately I don't think that's achievable without a mill or two weeks of dremel work. I found the carbide bits blocking up too easily with aluminium.

What do you think. One flywheel Or two

Really happy with the compression.

Close enough:) My engine was early twenties.

Do you know how many of yours have been made. I have seen quite a few while researching. One thing I did notice was that Gardners have many variations of each engine type they made. I don't know if this has been the result of ''maintenance'' changes by owners or factory variations - Made to...

Just adding a bit of bling before moving onto fuel and ignition.

Thanks Graham. Moving it one tooth was a bit too much and the exhaust was closing too soon. I relocated the exhaust cam and re-drilled the inlet locator. Got it to here now. Exhaust opens just before BDC and closes just at or very slightly after TDC. Inlet opens Just after TDC and closes at or...

Inlet valve attached and timing set. I have been playing around with the timing to try to optimise. The short video shows what I have got so far. I would appreciate any advice if anyone thinks this can be improved or if it is wrong. Now is the best time for me to get it right.