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Hi All, I have plans for a gear reduction unit, but they do not list the DP for the gear cutters. they list the number of teeth and the OD of the gears, but not the DP. Question, How do you work out the DP. The small gear is 20 tooth, with a listed OD of 1", the large gear is 30 tooth and a...

Eccentric I normally glue the spacer piece in and leave it until all machining of crank is finished, that way you will not accidently build in any warp or twist. Cheers Andrew

Brian, You should be able to get shorter bolts, these are 4-40 x 1/4 I use for walbro carby rebuilds. Cheers Andrew

Brian, From the Engineers Black Book, the 4-40 drill size is a #43, which gives a 71% thread depth. Just thought it may help. Cheers Andrew

Brian, I was going to suggest that you get some more taps and dies and use plenty of lube on them. Work out how many holes and divide by the number of taps and only do that many holes and then use a new tap. And just take it slow, what you don't get done today, you can always do it tomorrow...

Brian, You fix what you can, and you send out to get fixed what you can't. I always do the same. Good thing about it, you get to give the back of the lathe a good clean down.😁 Cheers Andrew

Hi All, Here you all are, running. Turn up the volume and enjoy Cheers Andrew

Hi All, Easy day today, went with electronic ign, machined up the pickup ring and prop driver, mounted prop driver and spot drilled the crank for the set screws to lock to the crank, made up a mounting plate, and ready to go. Mounted on test stand and run, played around with the timing and...

Another on I will be watching, Thanks Brian. Cheers Andrew

Hi All, Got the rear cover intake done today. machined rear cover, lapped in the crank, then machined outer part/intake of the cover in mill. Set up crank and machined intake port. Fitted intake tube to back-plate and checked the assembly. Cheers Andrew

I don't know any thing about the revolving centre, I picked it up at a garage sale with a heap of other tools, there was a sticker on it at some stage, because there was the remains of it on it when I got it. Sorry. Cheers Andrew

And some more

Hi All, Removed from lathe and re-set to machine crankshaft shafts, had to reset and glue in the crank spacer. Started with the front shaft, then machined the rear rotor/drum, drilled for crank webs and rough machined. Machined up a jig to hold the crank and mounted in the mill and finished...

Andrew UK Don't care what it is called, it is not that Tiny to some of the other builds around. It may of been Tiny back in the day thou.

Hi All, Started on the crank today, cut piece to length, center drilled for crank and big-end center's, mounted in mill and hogged out big end. Mounted on lathe between center's and machined big end. Cheers Andrew

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Some pics.

Hi All, Had a big day today. I could not get any bronze flat bar, so made some. Cut a piece of round bar over length, cut of the big end cap piece, faced both and soft soldered together. Set in mill and using a slitting saw I got two pieces for con-rods. Marked out, then drilled and tapped for...

More photos

Hi All, Got into the crankcase today, machined to size, marked out, drilled and tapped mounting holes, set in 4 jaw chuck and machined. Cheers Andrew