Tiger Cub Frame Modication // Paul Brodie's Shop 

I've learned so much watching your videos. I just made an Amazon order for tools and supplies. When I first came up on your videos, I was looking for an alternative brazing Flux for silver jewelry. I have customers who have been asking me since 2006 if I was going to start working silver again. Since I've been watching your vids, I've been sitting here with my jewelers saw, fabricating parts for my next line. I haven't had time to do jewelery because I've been busy learning new things to fit into my previous career as a Facilities supervisor. I've had my CDL, can build a motor, weld, braze spent 8 years as a first responder. Now I've decided to kick back and retire at 55. The other day my brother asked if I was going to fabricate some sterling silver parts for a bike. He watched as I pierced and manipulated a sterling plate to snake around the cane ive been making for myself. I remember watching, 52 years ago as a man cut a pipe and brazed it. I was 4 years old. Everytime I pick up a torch to heat something, I think of that. I've always been creative and I see how things work, how molecules are supposed to flow. It makes things easier for me to learn and it really helps when I'm tutoring computers, painting or any other craft. I've always got one apprentice and this summer I've been searching. I haven't been out much since I've gotten back from my tour two years ago. I really think I've retired to early.

If I spent as much time working on my projects as I do watching yours and other peoples project builds…I’d really get things done. I enjoy seeing how you approach a problem and find the solution. I may learn as much from the errors as I do from when you figure out the way that works. I’m currently restoring a Benelli 750 sei- almost done.

Love that "Milling Time"!

Right hand index finger pointed along the frame of your Sandvik hacksaw frame, gives a little more control. Respect for your process, We'll done that young man there

It's a Unifold! (Yeah, right. It's actually an adaptor, but that would be damning a work of beauty). As a world class pedant I knew, obviously, that manifold was incorrect, but Mr. Brodie is a nice guy and he's doing his best. Which, I might add, is a hell of a lot better than mine or thine... He's Canadian and he doesn't end every sentence with 'eh'. That makes him an intellectual, (English born, it goes without saying). And a dashed fine maker of things...

Quick .. I need coffee and a sit down ... a new video to enjoy . Perfect. I love it when you use Cardboard Aided Design ,,, CAD is the way forwards.

Respect for taking the time to explain the technicalities its important for the next generation of engineers and fabricators to have all the information available to them no matter how trivial it may seem.

Once again the Master at work

The Internet was developed for the sole purpose of one person pointing out to another person that they have said or done something incorrectly. 👍

Your work is absolutely amazing!!!! Keep up the great work Paul! Great camera work as well Mitch!

Where I worked we would straighten 1.5 square 1018 cr steel. Once in awhile we would get a lot that would fracture just like you experienced. It's origin was from a country not known for quality.

The early British motors were beautiful, I was a Norton enthusiast, commando era, now its Harley

Respect, that is all I have for this man right here. acknowledge your mistake, learn from it and move forward. grind!

Oh, I'm going to be late for my appointment today because of this video...oh well lol.

I love Tiger Cubs! My first, second third and fourth bikes were all Tiger Cubs. To this day I'd still love to have another

In my opinion, if you build it, you can call it whatever you want! hahaha. Take care and as always, I appreciate the great videos.

Burgundy and cream for me all day long, not sure why perhaps bonnie colours? Nice to see it coming along.

Always enjoy your videos. Keep up the awesome work. Glad to see I'm not the only one that can't have just one project on the go at a time.

I look forward to these every week! I have learned so much. Thank you! Don't let the bastards get you down.

Details, details, details. You aren't the only "fool" who always new it as a manifold - sure it's not "correct", but at least we know what you're talking about - more fool them.

Paul, thank you as always. Another word for the manifold might be spigot, although I normally think of those as protruding from the casting of the head. RE: broken part... it it even remotely possible that your fender tabs might have been a carbon steel, something that hardens? You can check this by doing both a spark test (look for feathery sparks) and an arc test - just light up on a corner of the material in question and let it melt slightly. The relatively cool mass of the part will chill the melted spot fast enough to harden. Then you can test it with a file - if the file cuts the welded spot, it's low-carbon. If it skates, it's high carbon. This trick works for determining the grade of cast iron as well. RE: masking tap around the fender. That's completely functional, and I'm not criticizing it whatsoever, but will add that I keep a flexible cloth tailors tape measure in my tool box for just such occasions. They're trivially inexpensive, so cheap you can't afford not to have one. :)

Thanks for clarifying the thread thing, I was actually wondering about that. You are a good sport!

Hi Paul , I enjoy your humorous clarification on the early section on most episodes. LOL. My wife was puzzled over my response, as we are from non- native speaker in S.E.Asia. Blessings to all.

My great-uncles were motorcycle builders and racers, something about you reminds me of them. I've just found your channel and I gave it an instant subscribe. Keep up the awesome work.

IIRC Whitworth has radiused roots. May be why some consider it stronger.

Call it what you want, it’s still a manifold to me. Thanks for taking the time to post these videos for us

Great job, really nice to watch, love your shop 👍😊

UK Top gear had a mystery race car driver who used to take cars to their limits known as the Stig... maybe he is now a video guy on you tube :D

Thanks again guys, great video!

yeah loved that, great skills and a charming presentation.

Manifolds/ types of tubing you serious 😂😂 please . Thank you. Bravo!!

Very enjoyable to watch. Great work as always.

Paul still having to apply the old triumph ways jigging up his tail with a 2 X 4" and breaking backets with a bloody big hammer good stuff

Great video ...as for the "mistake" .. I've always called it a inlet manifold too lol 😅 ..I'd just told the guy "who gives a F" ..we all knew what you meant by it Paul

Nice one Paul now I’m looking at a bent arse end like yours before the repair on my cub trials tr20…………another job to do 😂 lovin it from the UK

The art of invisible repair

If it looks good, it is good . 🍻🇨🇦👨‍🏭

“Carb-bure-a-tater Adapter?” (Carburetor is deliberately spelled weird, to indicate the weirdness of some mixers I’ve messed with. I’m thinking about some cantankerous Keihin carbs on my first bike. I had to replace them in an attempt to get the bike to run right - with 20 mm Mikunis. It never did!)

For grinding I suggest you to try fiber grinding discs on the angle grinder they work really great.

I started watching to learn about brazing. Very interesting I enjoy watching and i have learned alot. Thanks

Working in metric as well as imperial. 👍

Another great video Paul! Let's unite and call it a manifold from now on! And who doesn't; I'm still your friend. 99,99 percent talent and craftsmanship slipped on a word. Get real and start a RU-vid channel. I'm watching and waiting... Thank you Paul!

Hi Paul happy new year. Carbs in Ireland some call it an intake manifold an some call an inlet manifold. it like the Philips an a crosshead or bonnet an hod women would wear them to cover their heads this was transferred over to cars to cover the engine so i suppose its just where you grow up.

A pleasure to watch and very informative as usual 👍👌 Cheers Chris

for those tight interference fits have you tried using a freezer (if the part is small enough) or instant freeze spray to shrink the OD of the part then a heat gun to increase the ID of the mating part?

Can you show how to Braze? What works best for you.Thank you for the Absolutely wonderful Videos.Great workmanship an attention to detail. 🙏

Super excited to have found your channel. First from MTB history, fabrication and a new found love of machining I think I’m going to find your channel super exciting. Love the shop. Not a manifold? Hmm intake runner carb adaptor? Silly.

You do really nice work, a real perfectionist. 👍👍👍

This episode brought to you by the word "technicality"

I have to wonder if the seven and a half pound fuel tank which resulted from the need to use heavy gauge sheet metal required to make a tank that would effectively take the place of the frames backbone bar and would not have its seams and welds be prone to cracking or splitting from the loads it’s subjected to was worth raising of the motorcycles center of gravity for the additional fuel capacity gained. In any event the design of the fuel tank and its use as a stressed member on the Tiger Cub is certainly an interesting design idea.

The secret is out, Mitch is actually a robot made from red sharpies.

It's likely due to the internal stress caused by the cold forming process. I'm guessing that was 1018 or similar? I could share a pretty funny story about me eating the floor bending some 3/4 round on my hossfeld twice in one day but ill save myself the embarrassment ll😬😄 I much prefer HRS for pretty much all bending, forming and heavy material removal machining because of stuff like this.

The correct term for that person is 'human', but I bet a lot of people call him something else.

I would still like to see you stick the bike onto the plug in the lathe. 🤣

Good lord! People need to get a life.

Paul I don’t know if Mitch has told you lately, or ever, but I think your doing a great job😁 (Just teasing Mitch😊❤️)

Surely if it’s for a single cylinder it should be a Unifold?! 😂

Did the service manual give the dimensions for checking the frame? I didn't know that about the tank, learn something new every day.

Hey Paul Excellent set of video's mate, I have enjoyed following you re furbishing the cub as I had one 50 years ago, Problem though, there is no completion video's, it says on my screen there are two missing hidden video's ? but after watching all the ones so far I would love to see it completed. Bob in UK

Are you going to fit a headstock oil tank brace? Sammy Miller still make them and I imagine that a fabricator of your calibre could copy one.

We always called it a carb spigot. 🤷‍♂️ It's a lot easier to install and service the engine (or remove it) with no frame in the way. Seconds saved on the assembly line.

The first bike my late Father own , then he moved you to a 650 Road Rocket

Very nice Sir

Paul. Could you have used the fender clips you hacked off on your new modification?.🧐

Thanks for the explanation of the Cub frame. I guess the idea of making the fuel tank as a structural member was not an overwhelming benefit or other bikes would have used it.

thats a good fit

I believe Whitworth threads are stronger because they have a rounded thread root rather than a sharp V. The rounded root is less of a stress riser.

Well Paul, those were two of the most egregious mistakes in motorcycle mechanics that have ever been seen. I think a bolt of lightning would have struck you had you went one step further and used a Phillips head screwdriver on a Reed and Prince screw. I can picture Peter Egan and Kevin Cameron sitting together watching your video and just shredding your skills and knowledge. Because I do not possess your Millyard-esque hacksaw skills, I have often had excellent results on similar tubing using a plumbers tubing cutter. Another excellent video, thank you.

It's a manifold, and will always be. My BSA single has an inlet manifold in it, according to me anyway.

Great video as always guys (Im sure its not easy coming up with content each week) Ive always called them an intake boot

Nice work Paul. I recently had some .25" cold rolled rod break exactly that way. Several pieces. Was also unweldable for some reason. Very odd.

Actually I am almost 70 , I find myself , surprisingly , seeing the difference between 55 and 60 degrees threads ,when nice and clean as they reflect light differently...as u say the 55 degree thread has a larger bottom radius and thus is stronger , hence, i believe, Cosworth stayed with BSF into the metric era.....at lest on their F1 stuff. but at 1/4" they're all close as BSC is always 26 tpi , but at 1/4" so is BSF and M6 is x1 which is 25,4 tpi ...dangerously close ....sometimes I use the M6 tap for the other two in order to get a locking effect....where one cannot use Nyloc

The top tube could go through nearly any tank if you felt like you wanted to do something a little different. The tube could be capped at each end with a couple holes, up at front and versa visa, to add fuel storage. With enter under my thumb your "visa versa" sounded a lot like a visa versally interesting coincidence.

I'll still call it a manifold :)

Poor Paul, he has manifold problems with his Tiger Cub.

Common usage of a word defeats enncyclopeadia = YOU WIN

Poker players use manifold too.

Have you checked the swing arm bearing clearance, they usually wear badly as they don’t get lubricated regularly?

Whitworth threads are stronger than UNF because the Whitworth threads have rounded crest and roots. The UNF do not control this and can be sharp. Due to the rounded root the cross section is slightly larger and therefore stronger.

were do you get spare British nuts and bolts Would help us Canadians with old British bikes.

It’s a Unifold 😁

Cold rolled bright mild steel is not what it used to be. Too many impurities from recycled metal? "Chinesium"? I don't know, but I used to make small brackets from 1 1/2" x 1/8" BMS flat bar until they started cracking. Have to use hot rolled 40mm x 3mm now....

Have you considered Steel-It to refinish?

You know, dear Mr. Brodie, I am shure that there are plenty of people, more knowledgeable then you outthere, but if you tell them, to fabricate an exhaust manyfold, they are uncapable of doing it. I have seen you on a video, where you built a complete motorcycle, was it a Henderson ? only having an old photograph of it. I would like to know, how many people on earth can build such a masterpiece ? So forget the manifold guy, and I would still call it a manifild, what the heck !

The term ‘manifold’ for single carburettor inlet mounting is in common usage, and therefore has become convention. If you Google ‘single carburettor mounting’, right at the top is a list of items for sale including single carburettor manifolds. RU-vid may be a pedant’s and troll’s playground, but there’s no good reason to allow them to win. Peace

What about a pipe cutter? It’s just an intake.

no rosette welds?.

Hi, is there any way I can buy your book in Europe? Thanks!

Grain structure

BSC is British Standard Coarse, surely?

Instead of manifold I think the word you are looking for is plenum.

Sir, if you are going to comment on the two different types of tubing you are using here perhaps you should explain to your viewers what the difference is. ERW and DOM are both welded tubes. ERW stands for Electric Resistance Welded. The tube is formed using a flat drawn through a set of progressive rollers to form the round shape and then the ends are forced together and current is passed through at the juncture point causing it to fuse much like a spot weld. DOM is made exactly the same way however the excess seam material is cut away using a scarifier. It is then Drawn Over a Mandrel (DOM) which causes the seam area to have the same metallurgical and structural characteristics throughout its length. As a result, DOM is considered to be superior to ERW since there is no seam to form a stress riser or have inconsistencies in the material characteristics. Seamed pipe is made much the same way but pipe uses a material that has a much lower tensile strength and a lower rate of plasticity which allows less deformation before failure.

So, why not "Mono fold"

I hate pedants..we exchange our knowledge so we can be better, and more informed people, not better than everyone else.. Speech is imprecise, and it is a fool who thinks he is perfect..