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If you have access to a cnc mill you could use a under cutting tool and do a circular profile with multiple passes to get the depth

Welcome to the site.

Dont worry there will be a video

Thanks for posting the links this looks very simple to make.

http://www.model-engine-plans.com/partskits/ignitionsystems/transistors.htm sorry heres the link brian. Did you use the sparkplugs from here too?

While seaching the forum looking for ignition info I came on a build for the same engine I believe it was from brian rupnow in there there was a link for mini sparkplugs. While searching the site I found ignitions heres the link for them if I bought it would it work for my engine

Thanks guys ive really enjoyed making this. Im already pondering my next build. I found a site that sells full prints and the have one of a v twin. After seeing the hoglet I think thats my next one

For an ignition I wanted something small ive seen the ones made woth the car coils but I think it would be a bit overkill. A electric ignition seems like the way id like to go if you can point me in the right direction. Are they prebuilt or can I go to say radio shack and piece one together

Been working on this for the past year when I could get the time. These are the plans I went with http://www.machinistblog.com/free-plans-david-kerzels-hit-miss-engine/ . All I need to do is the ingintion and figure out a buzz coil. I hope I can get it to run. Any comments welcomed

I no I havnt posted in a while. Im finishing up my first build. I ended up doing this http://www.machinistblog.com/free-plans-david-kerzels-hit-miss-engine/ took me a lot longer than I thought. All I need to finish up is the ignition. does any one have plans for a buzz coil. Ill post some pics...

So are you saying make the piston bigger or add a resess to the head so there's space for ignition. What about running it on gas

Im building Brian Rupnow's build--Hit and Miss air/steam engine but id like to convert it so I can run it on gas or diesel. How would I go putting a ignition on it been searching the web cant find much info. Could I use a glow plug from a model rc os engine any info would be great.

if you have acsess to a tooling grinder you could modify a endmill or like scott said you could use a grinder with a 15 degree angle on the face of the wheel.

this is one cool site. My name is Dave ive been a machineidt for over 10 years. Ive made a lot of cool things but lately been thinking about engines and that's how I stumbled on this site. I currently run mori sieki nmv5000 5 axis a mori 4 axis horizontal and a 3 axis vertical. for my first...