Search found 1355 matches

by Jeff K
Wed Nov 11, 2020 1:58 pm
Forum: Tech
Topic: Electrex Ignition Question
Replies: 7
Views: 426

Re: Electrex Ignition Question

Electronic Ignitions tend to be at full advance and then they "retard" the timing at low RPM. So you set them at TDC and they adjust for the advance. The full advance makings are are normally use for strobing the timing to check on the advance. An example would be the Power Arc units, you set the pi...
by Jeff K
Fri Oct 30, 2020 1:45 pm
Forum: Tech
Topic: Rebuild Compression
Replies: 23
Views: 890

Re: Rebuild Compression

Propane torch is all that I have every needed. You will know when it is done right because the gasket will be very pliable compared to stiff before you started.
Jeff
by Jeff K
Thu Oct 29, 2020 8:57 pm
Forum: Tech
Topic: Rebuild Compression
Replies: 23
Views: 890

Re: Rebuild Compression

I thought the same thing at the time. Then I had a Don Hawley, old Triumph mechanic from the long gone Saginaw Cycle sales tell me that he had the same problem years ago. 500cc Twin cylinder no pushrods, so no air in, no air out. Same deal, a customer tried to rebuild it himself. So yes it does comp...
by Jeff K
Thu Oct 29, 2020 11:43 am
Forum: Tech
Topic: Rebuild Compression
Replies: 23
Views: 890

Re: Rebuild Compression

A little soap and water around the head gasket will tell you if it is leaking. No bubbles is a good thing.
:thumb
Jeff
by Jeff K
Thu Oct 29, 2020 1:43 am
Forum: Tech
Topic: Rebuild Compression
Replies: 23
Views: 890

Re: Rebuild Compression

Compression check- write it down. Pull the plug squirt a little oil and redo compression check. If it jumps up, then it is the rings. If it does not then it is the valves. Using WD40 as a piston ring assembly lube will speed up the break in. I also like to pull the plugs and kick it until my leg tel...
by Jeff K
Fri Oct 23, 2020 2:30 am
Forum: Parts for sale
Topic: Ebay -OEM BSA B50T exhaust muffler-silencer B50ss gold star B25
Replies: 0
Views: 443

Ebay -OEM BSA B50T exhaust muffler-silencer B50ss gold star B25

OEM BSA B50T exhaust muffler-silencer B50ss gold star B25. Saw this today, looks nice.
https://www.ebay.com/itm/164462119503

Jeff
by Jeff K
Thu Oct 22, 2020 7:28 pm
Forum: Tech
Topic: Ok..now its got me mad..spark plug
Replies: 11
Views: 725

Re: Ok..now its got me mad..spark plug

Tickle it, kick over and if nothing. Then pull the plug and check for signs of gas. If it is dry or you can not smell any gas- then that is it, you are not getting any gas to it. Are you holding the tickler down long enough to see gas running out?
Jeff
by Jeff K
Thu Oct 22, 2020 1:39 pm
Forum: Tech
Topic: B50 valve lifter to bare casting.
Replies: 37
Views: 2379

Re: B50 valve lifter to bare casting.

Thin copper gaskets have been well covered here and on other sites. I found that only the original 4 stud B40 gasket kit had the thicker .048" one. I had latter OEM BSA 6 stud BSA B40 gasket kits that had the thinner .036" in them. At the time I had Peter Quick and Ed V. checked their inventory and ...
by Jeff K
Fri Oct 02, 2020 4:16 pm
Forum: Tech
Topic: tightening head nuts sequence
Replies: 27
Views: 1792

Re: tightening head nuts sequence

Silicone in the bolt hole was common back in the 1960's-70 dirt bike era. I have seen it more then a few times where the owner would use the hand held impact driver and a big hammer. A bit of silicone in the hole and the results were the bottom of the hole getting blown out. Mostly on bolts/screws t...
by Jeff K
Tue Sep 29, 2020 8:59 pm
Forum: Tech
Topic: tightening head nuts sequence
Replies: 27
Views: 1792

Re: tightening head nuts sequence

Did you pull the stud to see if anything was in the hole? I can remember seeing where people had used excessive amounts of gasket sealer on a stud/bolt and then when they tried to screw the stud/bolt in all the way, it could not bottom out due to the sealer in the hole. I can also remember seeing de...
by Jeff K
Mon Sep 28, 2020 9:48 pm
Forum: Tech
Topic: tightening head nuts sequence
Replies: 27
Views: 1792

Re: tightening head nuts sequence

Check the height of the threaded section on all of the studs. You could be running out of thread before nut has tightened the head down.
Jeff
by Jeff K
Sun Sep 27, 2020 2:41 pm
Forum: Tech
Topic: Rickman Framed B44
Replies: 11
Views: 884

Re: Rickman Framed B44

The older bikes used cast sections that were machined to except the tubing, this included fittings for items like foot pegs that were slid over the tubing. These were then brazed together. Later they started to weld these casting to the tubing. Most custom frames that I have seen through the years w...
by Jeff K
Sat Sep 26, 2020 3:09 pm
Forum: Tech
Topic: Rickman Framed B44
Replies: 11
Views: 884

Re: Rickman Framed B44

I found out decades ago the the secret to good welding is a good face shield so you can see what you are doing. I have been using a 35+ year old cheap "Multi-mig" brand that was made in Italy. When it is dialed in right, I can see the wire form a small bead and then the bead drops/jumps the small ar...
by Jeff K
Sat Sep 26, 2020 2:22 am
Forum: Tech
Topic: Rickman Framed B44
Replies: 11
Views: 884

Re: Rickman Framed B44

How about MIG brazing. Some of the car manufacturers have been doing this for a while. It is a "brazing wire includes copper-silicon (CuSi3), which is most common for sheet steel, or bronze alloy solder (CuAl8 and CuSn6). " that is used with a mig welder. I think they started to use this when they s...
by Jeff K
Tue Sep 22, 2020 7:00 pm
Forum: Tech
Topic: B50 valve lifter to bare casting.
Replies: 37
Views: 2379

Re: B50 valve lifter to bare casting.

Do the B50's have the same problem as the B40 & B44"s with the many different head gasket thicknesses? I ran into this with a B40, the Cylinder wall lip would hit the head before the gasket had completely sealed. Turns out the B40 copper gasket is thicker then the b44. Well documented in the Ratio b...
by Jeff K
Tue Sep 22, 2020 5:27 pm
Forum: Tech
Topic: tightening head nuts sequence
Replies: 27
Views: 1792

Re: tightening head nuts sequence

The threads should be clean and dry and NOT oiled as the tightening torque will be increased due to the lowered friction caused by the oil! Tightening sequence isn't so important on a single cylinder engine as it is on a multi cylinder engine, as a general rule you just need to tighten in diagonals...
by Jeff K
Fri Sep 11, 2020 1:59 am
Forum: Tech
Topic: B25 Rough Running..missing slightly
Replies: 17
Views: 1398

Re: B25 Rough Running..missing slightly

"You pays your money and gets the technology for the price." Yes indeed!. The Power Arc is not cheap at all. But you get a choice of 4 built in spark advance curves--- Regular gas mild Regular gas wild Premium gas mild Premium gas wild And it has a built in port to hook up your laptop to it so you c...
by Jeff K
Wed Sep 09, 2020 7:58 pm
Forum: Tech
Topic: B25 Rough Running..missing slightly
Replies: 17
Views: 1398

Re: B25 Rough Running..missing slightly

I think that the Tri Spark is like the USA made power Arc in that they both spark three times. I have installed a several of the Power Arcs units and the first thing that I noticed every time, was the idle speed jumped up a couple of hundred rpm and the bikes ran noticeable smoother. Since your prob...
by Jeff K
Sun Sep 06, 2020 2:35 pm
Forum: Tech
Topic: B25 Re-sleeve
Replies: 4
Views: 591

Re: B25 Re-sleeve

It has been a few years since I had a B40 re-sleeved. You have the cost of the sleeve, the labor and then it still has to be bored or honed to fit the new piston. Cheaper to find a good used one. I think at the time that I had $150.00 + into it.
Jeff
by Jeff K
Tue Sep 01, 2020 11:21 pm
Forum: Tech
Topic: B50 oil pressure switch removal
Replies: 8
Views: 605

Re: B50 oil pressure switch removal

Armstrong Phil wrote: Tue Sep 01, 2020 11:11 pm Sounds like I've opened a can of worms! Think I'll take the switch out, cut the head off and drill tap it for a sealing bolt and use that, at least I know I've got the right thread and won't damage the case.
:thumb :thumb
by Jeff K
Tue Sep 01, 2020 6:50 pm
Forum: Tech
Topic: B50 oil pressure switch removal
Replies: 8
Views: 605

Re: B50 oil pressure switch removal

Is it a tapered or straight thread? I seem to recall that Triumph Triumph T100 twin used both. I am not sure if BSA did also, I know that BSA and Triumph shared a lot of parts. Getting them mixed up will cause issues.
Jeff
by Jeff K
Sun Aug 30, 2020 1:16 am
Forum: Tech
Topic: B25SS exhaust pipe
Replies: 11
Views: 1007

Re: B25SS exhaust pipe

I just checked his web page and it looks like he makes the 71 mufflers. "B25/50 Pressed muffler $310 ea" https://dropbears.com/overlander/classic.htm Dropbears? Aren't Dropbears the man eating, killer cousin to the timid Koala? I seem to recall that they only attack after their victim has consumed m...
by Jeff K
Fri Aug 28, 2020 7:27 pm
Forum: Tech
Topic: B25SS exhaust pipe
Replies: 11
Views: 1007

Re: B25SS exhaust pipe

LOL! I just reread the original posting and the poor excuse was given that perhaps the barrel was shortened?? --- 3/4" ?? :roll: :roll:
Jeff
by Jeff K
Fri Aug 28, 2020 7:24 pm
Forum: Tech
Topic: B25SS exhaust pipe
Replies: 11
Views: 1007

Re: B25SS exhaust pipe

Sad when you think about it. The factory was able to manufacture these 50 years ago on what was old equipment back then and they fit and worked. And here we are one half a century later will all of our massive advancements in computers, scanning, CNC, manufacturing, technology etc and the "new" pipe...
by Jeff K
Fri Aug 28, 2020 4:10 pm
Forum: Tech
Topic: B25SS exhaust pipe
Replies: 11
Views: 1007

Re: B25SS exhaust pipe

As we say here in the USA, I am calling Bull Sh*T on that sellers answer. I have a 1971 Triumph Trail Blazer that is still original and untouched! and here are the photos of it for you. The original clearance is not in the thousands, it is closer to 3/4". This is just the way that the bike came from...
by Jeff K
Thu Aug 27, 2020 3:19 pm
Forum: Tech
Topic: Lozenge Silencer
Replies: 6
Views: 996

Re: Lozenge Silencer

Great work!
Jeff
by Jeff K
Sun Aug 23, 2020 1:53 am
Forum: Tech
Topic: Bsa b44 enduro
Replies: 6
Views: 798

Re: Bsa b44 enduro

Blue Loctite works wonders on studs. Holds and seals. plus in comes apart with hand tools.
Jeff
by Jeff K
Fri Aug 21, 2020 3:07 pm
Forum: Tech
Topic: Oil leak(s) b50
Replies: 11
Views: 973

Re: Oil leak(s) b50

I would think that using Loctite blue would serve the same purpose. Seals and locks, and can be remove with hand tools.
https://www.amazon.com/Loctite-Heavy-Du ... B000I1RSNS
Jeff
by Jeff K
Fri Aug 21, 2020 3:02 pm
Forum: Tech
Topic: B25SS Burning Oil
Replies: 28
Views: 1667

Re: B25SS Burning Oil

The Kibblewhite Valves are specially coated SS and their guides are a very hard copper based C63000 nickel-aluminum bronze. The valve will not fit into the guide when you get them. The using pin bore gauges that are in the ten thousands range you have to hone them to fit. Then once the head is heate...
by Jeff K
Thu Aug 20, 2020 7:26 pm
Forum: Tech
Topic: B25SS Burning Oil
Replies: 28
Views: 1667

Re: B25SS Burning Oil

I have been using the Kibblewhite Black Diamond valve and Bronze guides for a while. The bronze guides are so hard that you can not use a reamer on them and they have to be honed to fit. Here is their recommended clearances. Aluminum cylinder head recommended valve stem-to-guide clearance is as foll...
by Jeff K
Thu Aug 20, 2020 7:16 pm
Forum: Tech
Topic: B25SS Burning Oil
Replies: 28
Views: 1667

Re: B25SS Burning Oil

And we have a Winner! Bad Guides! :ban
Jeff
by Jeff K
Thu Aug 20, 2020 6:34 pm
Forum: Tech
Topic: B25SS Burning Oil
Replies: 28
Views: 1667

Re: B25SS Burning Oil

Just a odd problem and normally you would see oil leaking on the outside due to it. How is the fit between the head and the cylinder liner. B40's had a issue with aftermarket copper head gaskets being too thin and the liner would hit the head before the head could seal the copper head gasket. You co...
by Jeff K
Wed Aug 19, 2020 2:40 pm
Forum: Tech
Topic: Cooked battery
Replies: 11
Views: 945

Re: Cooked battery

I had issues using LI-ON batteries in the past, two in a 850 Norton and one in 750 Triumph. After many conversations with the company, it was determined that they do not play nice with either the Podtronics or the stock charging systems. The Manufacture recommended a charging system that was designe...
by Jeff K
Tue Aug 18, 2020 2:53 pm
Forum: Tech
Topic: Bsa b44 enduro
Replies: 6
Views: 798

Re: Bsa b44 enduro

Clean it off with carburetor cleaner/spray, let dry and then blow some baby powder/talc on the area and start it up. Short ride and you should be able to pin point the leak. Many times it is seeping from some where else and where you see it , is where it has settled at.
Jeff
by Jeff K
Mon Aug 17, 2020 5:54 pm
Forum: Tech
Topic: B25SS Burning Oil
Replies: 28
Views: 1667

Re: B25SS Burning Oil

Excellent choice using Mark!
Jeff
by Jeff K
Mon Aug 17, 2020 2:39 pm
Forum: Tech
Topic: B25SS Burning Oil
Replies: 28
Views: 1667

Re: B25SS Burning Oil

"A Starfire piston will fit a onto an SS con-rod, so it’s more than likely that this is the only non-SS item fitted. " The crankshafts and rods are different between the two models and the factory used a different ratio to balance them. Heavy oil use due to rings normally equals clouds of blue smoke...
by Jeff K
Sun Aug 16, 2020 11:28 pm
Forum: Tech
Topic: B25SS Burning Oil
Replies: 28
Views: 1667

Re: B25SS Burning Oil

What type of oil did you use to break it in with? Some of the new oils will cause the rings to go a very long time before finally breaking in. I remember a old cycle mechanic pal of mine used to swear by using WD40 as a assembly lube for cast iron rings and cast iron bore. He firmly believe that any...
by Jeff K
Sat Aug 15, 2020 4:48 pm
Forum: Tech
Topic: flywheel balancing
Replies: 15
Views: 1131

Re: flywheel balancing

I should add that if you do not have the "factory" tool. A old work around was get a roll of electrical or plumber's solder, the heavier 1/8" diameter stuff, unroll it and weight it. then carefully cut off enough to get the proper weight and then just wrap this around the big end . The key word here...
by Jeff K
Sat Aug 15, 2020 4:37 pm
Forum: Tech
Topic: flywheel balancing
Replies: 15
Views: 1131

Re: flywheel balancing

I was just checking my old notes and found this. It was from Peter Quick's BSA unit singles site. The 1971 is different due to the change in the connecting rod.
B50 B25 SERVICE BULLETINS 1971 TO 1973xx.pdf
(187.28 KiB) Downloaded 47 times
Jeff
by Jeff K
Sat Aug 15, 2020 4:27 pm
Forum: Tech
Topic: flywheel balancing
Replies: 15
Views: 1131

Re: flywheel balancing

From the repair manual.
ws-bsa-B25-B50-part2 00-4188.pdf
(452.89 KiB) Downloaded 55 times
Jeff