Search found 60 matches

by matt49g
Tue Jan 05, 2021 2:58 pm
Forum: Tech
Topic: Rocker return spring??
Replies: 7
Views: 779

Re: Rocker return spring??

There is information on "Auxilliary Return Springs" on page 38 of "Tuning for Speed," by P.E. Irving
by matt49g
Mon Jan 04, 2021 3:34 pm
Forum: Tech
Topic: B44 piston in a WDB40
Replies: 8
Views: 736

Re: B44 piston in a WDB40

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
by matt49g
Sat Dec 19, 2020 5:24 pm
Forum: Tech
Topic: race tuning 250 and 350
Replies: 15
Views: 1665

Re: race tuning 250 and 350

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...
by matt49g
Sat Dec 19, 2020 3:41 pm
Forum: Tech
Topic: race tuning 250 and 350
Replies: 15
Views: 1665

Re: race tuning 250 and 350

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.
by matt49g
Sat Dec 19, 2020 3:35 pm
Forum: Tech
Topic: race tuning 250 and 350
Replies: 15
Views: 1665

Re: race tuning 250 and 350

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...
by matt49g
Tue Dec 15, 2020 1:04 am
Forum: News
Topic: Stan Millard
Replies: 20
Views: 3359

Stan Millard

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...
by matt49g
Wed Jul 17, 2019 3:13 pm
Forum: Tech
Topic: Misfiring while driving. Starts and idles Okay
Replies: 14
Views: 3779

Re: Misfiring while driving. Starts and idles Okay

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...
by matt49g
Tue Apr 16, 2019 2:01 pm
Forum: Tech
Topic: Breather spigot removal
Replies: 5
Views: 2360

Re: Breather spigot removal

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.
by matt49g
Fri Apr 12, 2019 2:17 pm
Forum: Tech
Topic: B44 valve size tolerances
Replies: 1
Views: 1386

Re: B44 valve size tolerances

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...
by matt49g
Mon Feb 18, 2019 6:49 pm
Forum: Tech
Topic: Best material for crankcase studs ?
Replies: 5
Views: 2574

Re: Best material for crankcase studs ?

Thank you very much
Matt
by matt49g
Mon Feb 18, 2019 4:52 pm
Forum: Tech
Topic: Best material for crankcase studs ?
Replies: 5
Views: 2574

Re: Best material for crankcase studs ?

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?
by matt49g
Mon Nov 19, 2018 4:44 pm
Forum: Tech
Topic: Crankcase Breathing
Replies: 22
Views: 7450

Re: Crankcase Breathing

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 ...
by matt49g
Sat Nov 17, 2018 3:53 pm
Forum: Tech
Topic: B25 carrillo
Replies: 15
Views: 4753

Re: B25 carrillo

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...
by matt49g
Sat Nov 17, 2018 12:37 am
Forum: Project bikes
Topic: B44 Flat Track Build
Replies: 19
Views: 9946

Re: B44 Flat Track Build

Where did you get the head bolt (stud) nuts?
by matt49g
Sat Nov 17, 2018 12:34 am
Forum: Project bikes
Topic: B44 Flat Track Build
Replies: 19
Views: 9946

Re: B44 Flat Track Build

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.
by matt49g
Mon Aug 14, 2017 1:28 pm
Forum: Tech
Topic: B44VS Tank Dent Removal
Replies: 17
Views: 5000

Re: B44VS Tank Dent Removal

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 ...
by matt49g
Tue Aug 30, 2016 1:04 pm
Forum: Tech
Topic: B25 won't rev past 5k
Replies: 85
Views: 21768

Re: B25 won't rev past 5k

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.
by matt49g
Fri Jul 15, 2016 2:29 pm
Forum: Tech
Topic: How to split B50 crankcase?
Replies: 12
Views: 4162

Re: How to split B50 crankcase?

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...
by matt49g
Thu Jul 14, 2016 12:43 pm
Forum: Tech
Topic: How to split B50 crankcase?
Replies: 12
Views: 4162

Re: How to split B50 crankcase?

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...
by matt49g
Sat May 28, 2016 12:43 pm
Forum: Tech
Topic: How to undo B50 crankcase bolts?
Replies: 54
Views: 12193

Re: How to undo B50 crankcase bolts?

E-Z-Outs sure aren't
by matt49g
Tue May 03, 2016 12:34 pm
Forum: Tech
Topic: B40 alloy barrel
Replies: 18
Views: 5582

Re: B40 alloy barrel

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...
by matt49g
Fri Apr 29, 2016 12:59 pm
Forum: Tech
Topic: Stuff and ,,,
Replies: 38
Views: 8574

Re: Stuff and ,,,

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.
by matt49g
Tue Apr 26, 2016 1:25 pm
Forum: Tech
Topic: B50 electric starter exists
Replies: 14
Views: 3569

Re: B50 electric starter exists

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.
by matt49g
Tue Apr 05, 2016 12:59 pm
Forum: Project bikes
Topic: B44SS
Replies: 195
Views: 62291

Re: B44SS

:thumb :thumb :thumb :thumb :thumb :thumb
My feelings exactly.
by matt49g
Thu Mar 17, 2016 1:24 pm
Forum: Project bikes
Topic: B25 trials bike
Replies: 10
Views: 3737

Re: B25 trials bike

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...
by matt49g
Sun Mar 13, 2016 1:16 pm
Forum: Tech
Topic: OIL DRAIN FROM CYLINDER HEAD
Replies: 38
Views: 7621

Re: OIL DRAIN FROM CYLINDER HEAD

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 ...
by matt49g
Thu Mar 10, 2016 1:48 pm
Forum: Tech
Topic: alternator
Replies: 9
Views: 2788

Re: alternator

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.
by matt49g
Tue Mar 08, 2016 2:00 pm
Forum: Tech
Topic: alternator
Replies: 9
Views: 2788

Re: alternator

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.
by matt49g
Sun Oct 25, 2015 1:56 pm
Forum: Tech
Topic: Heavy Breathing!
Replies: 8
Views: 2856

Re: Heavy Breathing!

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.
by matt49g
Wed Aug 05, 2015 1:53 pm
Forum: Off topic
Topic: Hybrid
Replies: 211
Views: 63499

Re: Hybrid

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...
by matt49g
Wed Aug 05, 2015 1:10 pm
Forum: Tech
Topic: Pepping up a B44
Replies: 14
Views: 4545

Re: Pepping up a B44

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...
by matt49g
Tue Aug 04, 2015 3:50 pm
Forum: Tech
Topic: Pepping up a B44
Replies: 14
Views: 4545

Re: Pepping up a B44

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 ...
by matt49g
Tue Aug 04, 2015 1:03 pm
Forum: Tech
Topic: Pepping up a B44
Replies: 14
Views: 4545

Re: Pepping up a B44

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 ...
by matt49g
Thu Jul 09, 2015 1:16 pm
Forum: Tech
Topic: valve timing
Replies: 18
Views: 4987

Re: valve timing

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...
by matt49g
Wed Jul 01, 2015 1:19 pm
Forum: Tech
Topic: piston fitting
Replies: 5
Views: 1722

Re: piston fitting

Ah, yes, two nations, divided by a common language.
by matt49g
Tue Jun 30, 2015 1:06 pm
Forum: Tech
Topic: piston fitting
Replies: 5
Views: 1722

Re: piston fitting

I'll ask before Stan or Tim do, what's a "Jubilee Clip"?
by matt49g
Fri Jun 19, 2015 1:36 pm
Forum: Tech
Topic: Low quality parts.
Replies: 14
Views: 3525

Re: Low quality parts.

People buy new parts for these things?
by matt49g
Fri Jun 19, 2015 1:32 pm
Forum: Tech
Topic: Stripped case screw
Replies: 8
Views: 2410

Re: Stripped case screw

Congratulations on your success. Any victory over these beasts, no matter how trivial, deserve recognition and celebration.
by matt49g
Mon May 11, 2015 1:55 pm
Forum: Tech
Topic: Leaking fiberglass tank
Replies: 7
Views: 2382

Re: Leaking fiberglass tank

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.
by matt49g
Mon May 11, 2015 1:35 pm
Forum: Tech
Topic: Leaking fiberglass tank
Replies: 7
Views: 2382

Re: Leaking fiberglass tank

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...