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There are a series of videos on youtube about rebuilding the Curtis OX5 engine. The camshaft is @ 3.00 The Valve gear is shown @ 4.40 on this vid,

You could try enginediy they advertise for wholesale Contact us

No need for maths or trig. Your drawing is just job. Draw cross section of disc, draw horizontal and vertical centrelines, draw centreline of hole at the correct angle through the intersection of those and just let CAD measure the offset.

https://imagearchive.com/proxy.php?image=http%3A%2F%2Fi31.photobucket.com%2Falbums%2Fc370%2FCADOperator%2Fcurvedcylinderboringmachine.jpg&hash=96ee08cd4b0715f5a635c277f7bb9315

3. Circumference is Pi x D. As Pi is constant then it's simply Diameter 6 divided by Diameter 2. Same rules for cam gears on a four stroke which are 2:1 ratio on pitch diameter and number of teeth.

When you're as long in the tooth as most of us on here you don't have time to age castings.;)

Are the MW 101 and 201 for forming boiler end plates

Your lathe is best leveled and bolted down. You can do it without drilling the floor by making some leveling pads which can be stuck to the floor. Commercial ones are readily available if you prefer to buy. Leveling Feet Vibration Absorbing Machine Mount Stand Foot MILLING DRILLING – Red Fox...

Facebook has its uses. Younger members of my family use facebook etc. and in turn I use it to keep up to date with whats happening with those family members who do. I also use it for some local groups. But there is a limit to it's usefulness. However HMEM and other forums I use for the same...

One alternative is to use the seat and needle from a tecumseh carb

I realise that I have hijacked this thread a bit although my comment was about the reedswitch use. I am going to start a new thread on the magneto

74Sprint. Thanks for your comments. As its a magneto I would not expect it to go above 1000 - 1500 RPM. So lets say 40-50 days of running. 1000 days @ 1 hour a day. Most models will never achieve that so longevity is not a problem. Physical size is important. As it will be encapsulated with no...

I am in the process of making a 1/4 scale 'magneto' housing the Battery, Coil, Condensor, and all electronics. I am using a reed switch which I expect to be a serviceable component. KSK-1A35-1520 available from Digikey, Mouser or Farnell

Oops - Of course there are. 😊 Point made though.🤔

Although that example is 3 miliseconds there are plenty of reeds that can cycle in less time. Even so, with 6 000 milliseconds in 1 minute thats 2 000 RPM on a two stroke and 4 000 RPM on a four stroke. Life expectancy at full power throughput can be as little as 8 hours of run time but at low...

If you really want good crankshaft steel then EN9 should be readily available in the UK as flat round or hex. I personally use mild steel as it's easier to get for me.

Why not make a wedge shaped spacer, say from aluminium, and use ordinary gasket material. Also it would help if folks knew where you were located. edit. I see you are from Ohio in another post.

I have been using nanocad free version for a couple of years now after losing my old autocad licence. Excellent for 2D work. I haven't tried the paid version as I don't need it.

Thanks guys. My question was really about how those of us without too much electronic knowledge and test equipment can tell if our ignition system is likely to be working under compression. I have a half decent multimeter but cant measure the kV output. (CDI) We can all see a spark outside the...

Slightly off topic. But can an ignition circuit be judged by the ability of a spark to jump a certain gap in air. So for example if a spark jumps 10mm in air is it likely to be OK under compression say 6 or 7 to 1