Board index Flathead Power-Technical Questions, Answers, and Suggestions Indians Making my own Billet Pistons

Making my own Billet Pistons

Post Thu Sep 21, 2023 7:09 pm

Posts: 1496
Location: Ojo Caliente,NM,USA
Over the years I've used Cushman and 73 Honda XL250 pistons in my Scout with Chief flywheels and Sporty Rods. Unfortunately the Honda pistons have mostly gone the way of the Dodo and the Cushman pistons are now made in China out of an alloy that I can cut with my pocket knife easier than a piece of oak. This doesn't leave a pore boy many options under $300.00 each or so. So the plan is to make a few out of 7075 round bar stock. 3" 7075 bar stock isn't cheap but I found a drop long enough to make 3 pistons for around $50.00 and some 73mm Yamaha piston rings. I parted the stock to length
Image
Since my mill is awaiting the replacement head after the junkie next door stole it and sold it for scrap. They go to my friend Harvey who is going to cut the inside and the wrist pin holes
Dusty

Post Fri Sep 22, 2023 6:07 pm
don

Posts: 613
Location: Spokane WA USA
Way to go Dusty!
Want and need, One can create tooling and parts,
It's all a step by step process.
I say it's metal make it do what You want.
Don in Spokane

Post Sat Sep 23, 2023 1:37 am

Posts: 144
73mm 2 stroke pistons any good?

interesting Ill be watching progress.

Post Sun Sep 24, 2023 8:32 am

Posts: 1496
Location: Ojo Caliente,NM,USA
Never found any 2stroke pistons with the right wrist pin height and the rings are too close to the top. The Xl250 pistons didn't last too gooder cause they were so short 4 7/16 stroke has a lot of rod angularity so the pistons need to be long and hard. The popup limits how close to the top the top ring can be limiting off the shelf even more.
Dusty

Post Fri Feb 02, 2024 9:57 pm

Posts: 1496
Location: Ojo Caliente,NM,USA
The guy that was going to do the mill work backed out so putting the Bridgeport style 4 hp head on my 1928 Oakley jumped to the top of the list. Got the head mostly mounted this week.
[img]https://i.postimg.cc/3RTtLq5J/IMG_20240201_172026323[1].jpg[/img]
[img]https://i.postimg.cc/DzsCPTNM/IMG_20240201_172003879[1].jpg[/img]

Post Sun Feb 04, 2024 7:53 am

Posts: 3578
Location: Central Illinois, USA
How are you going to grind the thrust faces, DD?

....Cotten


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