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"And now the real story behind WD40"! https://www.wd40.com/myths-legends-fun-facts/

This is my 1st. twin cam engine. 20/40T MXL sprockets and belt. I order the belt running some thread over the sprockets with cyl. head torqued down and idlers in place, measure its length. In the photo, I have a spacer under the radiators to raise the camshafts to take up the slack, testing out...

Yes, keep study on the photos. One port has to go thru the valve guide and the other has to be on the down side of the valve head so when valve opened you have flow between the ports. That is possible but not practical using a single piece block for both ports. Your issue then becomes how do...

Kinda make you wanna go out side and mow the lawn!

Your solution is to move the brass gear into alignment with the crankshaft gear. I understand with a press fit or Locktite of the crank throw to the crankshaft, removal of the crank/ flywheel out of the frame is an issue. This crank throw should be set screwed to a flat on the end of the crank...

The drive from the crankshaft to the flywheel is done by a pair of XL 18T sprockets. Wanted a more substantial belt here than using the MXL sized belt and sprockets. Ya that looks pretty meaty! At the backside of engine another pair of towers for the bearing carriers and the shaft for ign...

Yes, in that last photo you see both block halves ...with the port side up. You are looking at the exhaust pipe on the left block where the valve guide would be horizontal looking at the head of the valve. Here is a view installed on another engine. Top half to intake manifold. Bottom half into...

Thanks Anatol. Let's split one open for a look/see. This is a steel valve in a brass guide in the top block side mated to the lower half side with the port to head. The o-ring over the valve guide seals the two block pieces. The valve on it's seat of the valve guide is the seal between the...

Under the deck, the crankshaft rolls along between the bearing carriers bracketed by 3/8 in. aluminum stock fastened to both the vertical and horizontal legs of the angle frame piece. A log of crank webs to be parted off to cage the con rods. These are 1.5 inch diameter with the throw for a...

The holes in the overlay are over sized so the head can be removed with the overlay attached or not. Head bolts and spark plugs pass through. A pattern of cooling fins milled in. Three socket head 4-40 screws right down the middle secure the overlay to the head then. And the cam...

That is true Willyb. Seems that in these days of modern OHC engines prevalence, the heads are taller than the block. I am sure most will like the look and proportions of WEDGE RUNNER as the postings continue. ---Dave.

Thanks K2. Center bearing here not mechanically required. Bearing to bearing distance is 4 inches. Don't need harden lobes for a low RPM engine with valve springs of .022 wire. Axle grease on the lobes the right lube here.

Ah no K2. This engine doesn't seem to care that the battery in my calculator went dead before I got to these considerations. ---Dave.

Stock photo of the real thing for an intro to my project! --- Dave.

The valve blocks bolted to the head determine the camshaft height above head. These cam towers came in from the valvetrain division with the shafts! Lobes ride on the bucket valve spring retainers threaded onto the valve stem. Those towers look pretty high to the top of the cylinder head...

Always nice to have an audience of fellow hobbyists! Dave.

Valve blocks made from .250 in. flat stock, 1 x 1.25 in. An O-ring seals the valve between the two blocks. Mounted to the head, a brass tube with o-ring seals the valve port to cyl. head port.

The head is milled out around the ports to dock the valve blocks. And the head is ready for the valves. Looks good!

The cylinder head will be my hybrid flat head design effort. I bore the combustion chambers to around .375in. depth. With the flat top pistons rising to a point about .250in. below the deck height, I get the right compression for the chamber volume presented. From the head perimeter port...

Wasted spark coils are not a type of ign. coil but just an effect presented in 4 stroke timing sequence where it's second lead is on an exhausting cylinder. Motorcycle dual lead coils need just one points set or electronic module to fire. My best guess is your MJN being more compact yet is the...