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My 750F2 project.

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Cb750r:
I have never liked the floppy passenger pegs, and would have removed them ages ago except for the fact it’s the one bike my wife likes riding on as a pillion and this is the bike we will go for mellow cafe cruises on together.

So I undertook the task of making them less floppy, by making a Delrin washer that’s thicker so in the upright position it’s snug. I also made Delrin bungs for the end of the peg so when in the “down” position the Delrin plug butts up against the bracket at 90 degrees. The added benefit is that the Delrin should be a lot more gentle on the brackets paint so folding them up and down won’t be sanding the powder coat down.

SteveD CB500K0:
Had to Google that…


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Cb750r:

--- Quote from: SteveD CB500K0 on February 12, 2024, 06:30:42 AM ---Had to Google that…


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--- End quote ---

Same material a lot of modern bikes frame sliders or similar bike protection is made out of. It’s a very easy to machine plastic. I think non trademark name is Acetal plastic.

Ive made a variety of sliders and rear stand bobbins, bushings spacers step washers etc with the material.

Cb750r:
Well I went to speak with the shop that did the cylinder boring, they put on a grand show, measuring a cold cylinder and moving around so quickly as to not really show me anything but say all the right words to convince me they have done no wrong.

I got sick of this and purchased my own dial bore gauge and measured all 4 cylinders. And my machinist is right the very top of all the bores are on target… but sadly that’s as good as the story gets.

All cylinders are barrelled. All of them are the most narrow at the top of the bore and tighten up a bit right at the bottom. Unfortunately that leaves them at the most wide at points where piston velocity and side thrust are at the peaks if I’m not mistaken.

While I’m not a machinist I did my best to take accurate measurements and can see how easy it would be half a thousandth out. However I can consistently repeat measuring the inconsistency in the final bore.

I think these cylinders will make a great decoration and will have to get another set machined by a motorsports specialist. I’ve attached my measurements below.  Note I re measured #1 it does barrel as large as 0035, but comes back down to 0030. Have it written down that 0035 was at bottom but it’s not.

Johnny4428:
Not qualified to comment on these figures, thankfully I had mine done by one of the very knowledgeable and competent qualified guys on this forum. Hope you get it sorted.

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