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A change of engine? After pulling the diesel engine out of the bike, I tried positioning a couple of other NOS engines in the frame to see how they might work. First was a Tecumseh OH195SA. It would fit great except that the carb is situated a fair distance away from the rear of the engine, and...

An electric start kit for this motor is almost as expensive as the engine itself. And then it means wiring, battery, etc. And does not address any of the other issues regarding clutch engagement, idling, engine shutoff… It just feels as though the juice from this isn’t worth the squeeze.

I have absolutely no idea how to figure out if the pump shim is wrong, or how to go about tuning it properly if it is wrong, except to just buy some shims and go through trial and error.

With the primary chain sorted, it was time to start up the Chinese Yanmar clone motor for the first time. I decided to attempt a static “pad test,” the primary chain fitted, but no final chain to the rear wheel. This would allow me to make sure the jackshaft and centrifugal clutch were...

I was able to get back into the workshop long enough to button up the jackshaft assembly. I shortened the keyed shaft, then faced it and cut a channel for the circlip in the lathe. I made the last remaining spacer needed and assembled it all. I was a little bit generous on the shaft length...

It looks as though there’s another project on the horizon. I couldn’t resist. For those who are not familiar with it, the GS190 (mfg ~2008/09 to ~2018) is similar to the cheaper GC engine architecture, but was upgraded with a cast-iron cylinder liner, 3-piece oil control ring, and...

USPS received a part I bought in January. Status was “Arrived at USPS Regional Facility” for two months, with no further updates. Fortunately, I got a refund from the Ebay vendor. Then, one day, the status suddenly changed to arrival at my local post office and “Delivered In Mailbox.” But...

If it somehow turns out to be something super rare and valuable, welding up and turning the shaft is not a terribly difficult or expensive operation. Edit: part terms are hard.

I would think a 5- or 8-speed internally geared bicycle hub would be a good choice. https://www.performancebike.com/shimano-nexus-sgc60018v-internally-geared-rim-brake-rear-hub-silver-36h-isgc60018vasa/p1298063

Yes, Indeed!

I intend to do a bicycle conversion like this with a tiny NOS Tecumseh 49cc 2HP 2-stroke I picked up a while ago, but there are other projects in line ahead of it.

This is a prime opportunity to leverage SendCutSend. You could spec a tight tolerance replacement from flat plate very cheaply and easily.

FYI: The new thread on the diesel bike is here: 5HP Diesel Motorbike

Thanks. I'm glad it's worth reading. I really enjoy the process!

Don't forget that there's reduction gearing on the primary side as well. The overall gear ratio is 8:1. (I know says countershaft sprocket when it's actually the crankshaft sprocket; I modified my generic motorcycle gearing spreadsheet).

That’s something I am aware of. This guy experimented with replacing the springs to alter the engagement RPM. (@ about the 6 minute mark in the video):

Yeah, I’m am sure there are better choices to start with, but I already had this one on hand. This rear sprocket is likely temporary. I currently have 65 teeth on the back wheel, but TBH I am not sure about the gearing. I might need to go down or up overall.

Work on the diesel bike continues. A rear sprocket to fit my Yamaha rear wheel that takes #35 chain isn’t really a thing, so I modified a go-kart sprocket to fit. I had a heck of a time getting it set up on the lathe properly, in large part because the cheap sprocket was about 40 thou out of...

Note: A cappella trigger warning.