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Just a note that tygon fuel tube is not as likely to kink as your clear plastic tubing.

I don't see it either.....any drawing you can muster so we know what you are talking about...??

I'd be checking the measurements as it doesn't sound correct. Either that or you gave us incorrect data.

Make it right the first time. Measure twice, cut once.

As you are using GT2which is metric, you are going to have to work in metric. I make it 458.75mm which is near as to 229 tooth, an unusual size and probably not available. Go to 230 tooth and fit an idler on the non-drive side.

Differing grades of wet and dry sandpaper, course to finer naturally, plenty of lube, so use either wd40 or mineral turpentine. When all surface grooves removed, polish up with the usual metal polish like "glow".

Make your own......cost maybe $40 with off the shelf bits on ebay etc. Bits include 12V dc black box.... Gy6 cdi coil....hall effect and a couple of minor mod components. If need a twin system, use 2 or DOC has a simple multispark diy system using a Ford coil on his Hoglet.

Almost like looking in a mirror here. Very similar ...perhaps look at the free version of Fusion 360. Plenty of video tutorials on youtube although some better than others. I went down the same path around 10 years ago and although interesting, I found the time necessary to become proficient...

Try these ....... mmm......link doesnt upload https://www.ebay.com/itm/234323095736

4 cylinder inline I built never had a problem and it was built with manifold same as the 6 above. Many instances too much worry goes in to nothing. Most are satisfied if the thing runs reliably, which is what my 4 cylinder does.

The two coils would need to be connected start finish finish start with out on the two starts. Frequency will increase with speed but the voltage will only get to a certain level and thats it. Alternator as a stepper...dont think so......maybe a brushless dc motor with the correct driver

Like this one......

Normally, ignition battery packs do not need to be enormous. First move in isolating ignition noise would be to use completely separate battery supply on the monitoring gear. Metal enclosure for the spark generating circuitry and shielded cabling on the HT lead with resistor type spark plugs...

Don't think they are made anymore. That plus worked with loop scavange 2 stroke not 4 stroke.

150w @ 1500 rpm one can easily get from a low voltage (12V) brushless motor. Speed controlled via an ESC and a 2 bob servo tester. Or, a straight up brushed motor with a gearbox. Same deal, only pwm speed control and again 12v supply. If there is not a lot of load, an old pc power supply or a...

Making cams is not all that big a deal. Run around 110 degrees duration with overlap between the inlet and exhaust, make sure the valves seal on compression stroke and you will be ok. As long as the cams have lumps on them, model engines will run successfully.

Joking right......??? Any glass scale DRO will do just fine. Made my first DRO on the old mill using software originally written by bloke Lindsay (DRO40 through to DRO54)and used an old PC with bare bones Windows 95 operating system. The optical sensors from old PC mouse were used to track the...

Use mineral turps when machining, gives a mirror finish. Use aluminium tap magic especially for standard soft aluminium tapping as it can be very "doughy" and small taps can break easily. Normally use crc when drilling rough out work on the pedistal drill.

I have but it may be protected info. Anyhow, you won't even start to build it for the price you can buy the complete system, coil and all. Many have tried their own uC cdi's in the past with varying levels of success/failure, the latter more prominent. 74Sprint (Ray) I think is currently...

Best to run an end mill bit in first to get a square line for the centre. Use a rotary table and divide hole centre radius into 7. Doen't matter where first one goes so long as the rest are equal.....simple.