BSA Bantam Yamaha Clutch Conversion Part Two - Modifying the Components

Part two of the series where I modify a Yamaha Clutch to fit and improve the BSA Bantam engine. I'm using a D10 engine but the same principles apply across the range.
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Thanks for watching,
Dean.
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[@retromechanicalengineer]

Thanks for all of the positive comments. I will try to post the conclusion within the next week or two. Best wishes, Dean.

[@carlwilson1772]

Absolutely fantastic. A tour de force of engineering design, planning and execution. Nothing left to chance. This is going to become the de facto way this is done and you are the originator. I wish Grandad could have seen it. It was a pleasure to watch. I'm proud to be your brother. More so than usual.

[@retromechanicalengineer]

Thank you very much. Let's just hope it works! There's a few little glitches that I'm anticipating but I think it should be a good conversion. I'm very proud of you too. Best wishes, Dean.

[@carlwilson1772]

@@retromechanicalengineer It will work a treat. Well done. I know what Grandad would have said. "Very Good".

[@bobuilt10]

Hi Dean, the youtube algorithm offered this series up in my machining feed so hopefully it will be pushing it out to others with similar interests. It's good to watch your methodology develop as my initial thought was that I would just recut the spline on the lathe with a dividing plate on the spindle. However I am not fully aware of dimension stack you are aiming for and am curious to see how this pans out. It's looking good so far.

[@retromechanicalengineer]

Thanks very much. I hope you enjoy the channel. Best wishes, Dean.

[@Steviegtr52]

Coming on nicely Dean. It will be a fantastic upgrade when done. Regards. Steve.

[@retromechanicalengineer]

Thanks Steve.

[@makerepairbin]

Another good video I am intrigued by how you will lock the spline to stop it from turning.

[@retromechanicalengineer]

I have a cunning plan, I just hope it works!

[@OzBSABantams]

This is turning out really well Dean and I'm looking forward to seeing the end result..............Weekend is over so I suppose I'll have to wait now until next week!

[@retromechanicalengineer]

Thanks Bones. It's taking me about two weeks between videos, just very busy at the moment. It depends when the remaining materials come in, I might get onto it a bit quicker this time. Thanks for your support, Dean.

[@AGEngineering]

What a fantastic interesting project, well done, excellent job. Great instructions and sufficient detail

[@retromechanicalengineer]

Thanks Ade. It means a lot to hear that from you. Best wishes, Dean.

[@xfire7]

I've always faced difficulties with following written instructions. Watching your videos is a real joy. 😊 7075 , isn't that duralamin ? If it is it needs to be T6 when finished ? Cheers Doug .

[@retromechanicalengineer]

Thanks for the kind comments. The 7075 was supplied in the T6 state. I was only using it for a fixture as I happened to have a suitable off cut. You could use any aluminium bar from your scrap box to the same effect. Best wishes, Dean.

[@InTheShedUK]

Nice solution with the fixture. I am going to take a guess at a locking method... Drilling along the joint & pinning it?

[@retromechanicalengineer]

Might be ....... Thanks for watching Ian, it's appreciated. Best wishes, Dean.

[@keithmoore5224]

In the 1960s i had a d7 175 me and my brother tuned it gorge tod head close rathio gears expantion exhaust very load lost a bit of weight lowerd the crank case compretion good for 70 plus faster than my b31 (73 mph on a hill down )

[@retromechanicalengineer]

That's great stuff Keith. I'd love to find a Todd head. Best wishes, Dean.

[@montana2strokeracer]

More great machine work, good job Dean, waiting for the part 3. Congratulations on your channel growth.

[@retromechanicalengineer]

Thanks Dale, I'm enjoying this project. Best wishes, Dean.

[@MrFactotum]

great job Dean, a great lot of thought gone in to that off camera, looking good atb Kev

[@retromechanicalengineer]

It has needed a good dose of thinking about. Thanks Kev. Best wishes, Dean.

[@cainbeeping8480]

Are you changing the front sprocket? It looks a little warn.

[@retromechanicalengineer]

More than likely Cain. The whole engine has had a hard life. Thanks for all of your support, Dean.

[@cainbeeping8480]

First

[@retromechanicalengineer]

Solid as a rock Cain. Thanks for your support.

[@carlwilson1772]

He's the best.

[@rhettfisher1018]

Why bother?? A well serviced and set up Bantam clutch is more than adequate.

[@retromechanicalengineer]

Hello Rhett, thanks for watching and commenting. I mentioned this in part one, in the trials arena, it's well known that the standard clutch is a bit of an Achilles heel. With the gearing run in trials, even a new clutch will slip on the trickier inclined sections. I was talking to a fellow who rides the Poachers recently, who told me there was a guy riding in February on a standard Bantam that had to drop sections due to the clutch. There have been many solutions over the years, including extra springs and of course, conversions to other clutches. Hope this answers your question. Best wishes, Dean.

[@carlwilson1772]

I don't know anything about Bantams but it seems that among the motorsports section of that particular set of devotees, there is a need for this modification since it is a long held and we'll established one. What you see here is the application of correct engineering design which has removed many of the constraints and issues that have plagued previous embodiments.