www.b50.org

matt49g

There is information on "Auxilliary Return Springs" on page 38 of "Tuning for Speed," by P.E. Irving

matt49g

The B25 wrist pin is 11/16" B44 is 3/4". What is a "Thunder Engineering" rod?
I previously posted what I did for my 350 conversion

matt49g

I have successfully campaigned a BSA 350 for several years on dirt tracks here in Wisconsin, USA. I didn't start with a B40, instead I used B44 cases, square cylinder and head, and a B25 crankshaft. I had to shorten the cylinder, studs and push rods. I used a Carrillo connecting rod and J&E B44 pist...

matt49g

Still didn't read your question right. The cylinder stud hole through the head is smaller on the B40. The B40 used a stepped stud, so the bottom is the same. I think the valve size between the the later 350's and early 441's are the same.

matt49g

I just wrote a post about my experience with a 350 BSA, but I think it got got the electronic demons (I didn't know Lucas made computer parts). If I cant find it I'll rewrite it. To answer you other question, there are several differences between round and square barrel heads; 1. other than the obvi...

matt49g

Every one lost a friend and mentor today. Stan Millard, the BSA whiz from Janesville, Wisconsin, USA, passed away in the last 24 hours. I don't have any details or more information at this time. I just wanted to get word out to all his friends around the world. He was one of a kind, he will be misse...

matt49g

The quality of components has improved so much over the years that we don't think of the obvious sometimes. These days getting a defective new plug is extremely rare, but if it happens to you, it's nowhere near rare enough. I know Stan Millard recently spent countless hours doing everything imaginab...

matt49g

If you put a short piece of round stock inside the dowels, you won't crush them. !/4" bolt almost works, you merely distort them, instead of crushing.

matt49g

According to Rupert, my own limited experience and what I've learned talking to people smarter than myself, you should be on the upper limit of still okay. Subtle things such as how far the valve seats are sunk in the head and the accuracy of the timing marks will affect valve to valve clearance. In...

matt49g

Thank you very much
Matt

matt49g

Just for us non-Jessops speaking other side of the pond-ers, Is there a SAE number for that? Better yet, a site where a person can cross reference the Brit-speak metal designations to the American number system?

matt49g

Interesting thread. I have a Ford valve on my B25 based dirttracker, and I also have oil in the vent line. The vent tube is 1/2" I.D. but I tapped into the back side of the primary case, not the top. The primary chain top run is right over the vent opening. I don't have any other breathers and have ...

matt49g

Kommando, Thank you for a very logical answer to a question that I've wondered about for a long time. Just having one drilled rod on a twin makes more sense now. As for the original B25 Carrillo rod/bearing question, spun bearing shells is in no way the fault of Carrillo, or any other aftermarket, r...

matt49g

Where did you get the head bolt (stud) nuts?

matt49g

I have converted a '68 B25 frame to OIF. I also have a very good "If I did it over" idea. If I can figure how to post pictures here I will, otherwise I'll ask for your phone number and text them to you, much faster that way.

matt49g

This is probably the best thread I've seen on here for awhile, no sarcasm and lots of constructive ideas. I absolutely love the concept of the "mini" porta-power ram. I have replaced bleeder scres with Alemite fittings (grease zerks) and used a grease gun to press out frozen brake pistons with good ...

matt49g

Have you checked the valve springs? They wouldn't have to be broken, they can collapse or weaken with age, and if not up to spec give the same symptoms you are describing.

matt49g

That's the drawing. The center bolt is threaded through the puller plate, the drawing shows 1/2 cycle thread, but use whatever you have a bolt and tap for. I think anything 3/8-16 or larger would work. If you don't have access to a lathe to make the alternator stud sleeve nuts, take the alternator s...

matt49g

Rupert Ratio has a full size drawing for a crankshaft pushing tool. His drawing is accurate enough that if you make a good copy of it, you can lay the copy over the metal piece you're going to use and center punch right through it, no measuring or laying out. I made one of these several years ago an...

matt49g

E-Z-Outs sure aren't

matt49g

some people use square barrels (which are much easier to find) and round the fins off to the correct shape to get the desired effect. Oil drain hole on the intake side won't line up with a square barrel round head combination. This can be solved by either drilling a passage in the head from the exis...

matt49g

but I can't find the B50 jig parts or the swing arm jig.

You're looking in the wrong garage, I think I have it.

matt49g

I'm not commenting on the engineering discussion because I'd be completely out of my element, BUT; I take my hat off to Doug Frazer, what a creatively engineered and beautifully executed piece of work.

matt49g

My feelings exactly.

matt49g

It worked fine for me, I just watched the first segment. After half a life time teaching welding processes to youth and adults, I share the authors pet peeve of confusing brazing and bronze welding. so I really enjoyed his explanation. And, of course, since I agreed with him, I could find absolutely...

matt49g

plugging off the drain holes in the head and re-drilling them nearer to the closest head tie-down bolt - then, drilling out cylinder so there clearance around these tie-down bolts so the oil goes down them - then draining the oil from the bolt holes into the c/case (not certain how yet, but several ...

matt49g

Wow! Keep that guy in business, last time I asked our local bearing supplier counter person for anything other than standard stuff, I was met with a blank, "deer in headlights" stare.

matt49g

Until now, it never occurred to me that finding SAE taps and dies would be as difficult for you guys on the other side of the pond as finding BSF and BSC stuff is on this side. My sympathies.

matt49g

Wow, Amazon is a great thing. I paid about $50. at AutoZone for the last one I got and thought that was a good deal compared to what I paid previously.

matt49g

Thanks for the pictures of the tube fabbing process. I like the idea of using a lathe to fish mouth the tubing, I had not thought of that before. Unless everyone else's lathe is different than mine, it doesn't know if the part being machined is for a BSA or Singer. A good mechanical tip or idea is s...

matt49g

Even if the valve heads are the same the stem length is longer. I thought this was the case, but wasn't sure. I asked about the length here last year but didn't get a reply. When I switched from round barrel to square last year I know the valves from the round barrel were too short for the square b...

matt49g

the oil drain holes have to be relocated, later model valves have to be used with the later model head and I think the push rods are different length also. I think the exhaust port height is different also. A little bit of a pain in the butt, but completely doable. I made the switch a year ago, but ...

matt49g

I have a 441 round barrel cylinder that someone installed a B50 sleeve in. It would probably be usable but everything gets pretty thin. If you keep the b50 fire ring on top then there is very little gasket area around the cylinder studs for good sealing, plus you'd have to open up the recess in the ...

matt49g

Decades ago I had a 441 with very loud clicking noises when turned over by hand (or foot). It took a long time but I finally realized the cam key was very slightly worn, allowing the gear to move maybe a degree on the camshaft. When the cam was opening the valve all the play was on one side of the k...

matt49g

Ah, yes, two nations, divided by a common language.

matt49g

I'll ask before Stan or Tim do, what's a "Jubilee Clip"?

matt49g

People buy new parts for these things?

matt49g

Congratulations on your success. Any victory over these beasts, no matter how trivial, deserve recognition and celebration.

matt49g

in answer to your first question
Anyone knows if the superglue will work and if not,,

I can just about guaran-dang-tee that super glue, or any other product applied to the outside of the tank, will have no long lasting positive results.

matt49g

I have had excellent results by using a gas tank sealer from Caswell (http://www.caswellplating.com/restoration-aids/epoxy-gas-tank-sealer.html). The kits come in different sizes for different size tanks. As long as you read and follow the instructions carefully and thoroughly you should have no pro...

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