Search found 249 matches

by mlb50
Sun Jul 04, 2021 1:40 am
Forum: Tech
Topic: Alternator wire is acting like a breather
Replies: 13
Views: 338

Re: Alternator wire is acting like a breather

At the front of the top frame tube is a breather tube. If the oil level is too high it may drip.
Best to check that first.
by mlb50
Thu Jun 24, 2021 4:26 am
Forum: Tech
Topic: Engine Bolt Torque Settings
Replies: 8
Views: 577

Re: Engine Bolt Torque Settings

Just a precaution - noting in Rickards table of torque settings - this one is a wrong. You'd snap it off well before that!

Zenor Diode nut 24 -28 ft./lb. kg/m
by mlb50
Thu Jun 10, 2021 2:47 am
Forum: Tech
Topic: B50mx Second Start Up Running Better but??"s
Replies: 19
Views: 3965

Re: B50mx Second Start Up Running Better but??"s

Yes, the copper side faces outward. In the video the process did not show the use of grease to hold the washer and rollers prior to fitting up the clutch basket. It pays to use grease and poke the rollers in.
by mlb50
Sat May 08, 2021 1:25 am
Forum: Tech
Topic: TR5T timing issues
Replies: 20
Views: 2271

Re: TR5T timing issues

Here is the hard part, the TR5T does not have a center stand unless you made one from a early OIF 650. So you have to get the bike up so the rear wheel is off the ground, with both spark plugs out and the bike in 4th gear, you can bump the tire to move the piston up or down. Here's the easy part. R...
by mlb50
Sun May 02, 2021 2:22 am
Forum: Tech
Topic: Dick Mann BSA legend
Replies: 3
Views: 1220

Dick Mann BSA legend

Sad news - Dick Mann passed away on Saturday 29th.

https://www.cycleworld.com/story/motorc ... ies-at-86/
by mlb50
Wed Apr 28, 2021 6:07 am
Forum: Tech
Topic: Oil line not connected
Replies: 9
Views: 1768

Re: Oil line not connected

With that blocked off feed pipe at the junction, if you don't know or trust how its been done, as a precaution slip a small length of fuel / oil hose over it with a bolt as a plug in the end and fit hose clamps. As to the rocker feed coming off the front of the timing case, that is a known mod that ...
by mlb50
Tue Apr 13, 2021 3:47 am
Forum: Tech
Topic: Gas tank liners
Replies: 27
Views: 3859

Re: Gas tank liners

Here's a practical tip. As you're worried about the nice original paint - rub a thick coat of car wax on it before you handle it with chemicals. Cork in the tap holes? Sure but as mentioned you can also stick a strip of duct or gaffer tape over the holes too. Don't over complicate this stuff. Its a ...
by mlb50
Thu Apr 08, 2021 4:08 am
Forum: Tech
Topic: Gas tank liners
Replies: 27
Views: 3859

Re: Gas tank liners

I would avoid putting a liner solution if the tank only has light rust. I have seen several liners peel off and turn into jellyfish blocking the fuel tap etc'. Absolute nightmare to clear out. With light rusting, I remove the fuel taps first. Block the tap holes, you can even use duct tape. I use a ...
by mlb50
Wed Mar 17, 2021 5:21 am
Forum: Project bikes
Topic: I'd like to ride this some day
Replies: 20
Views: 5491

Re: I'd like to ride this some day

My MX has aftermarket plastic mudguards, but I believe I have the original front fender. The one I have is aluminum and lightweight. Was the original aluminum? I can take a picture of it if need be. Beware of fitting alloy guards. Any bolt hole really needs a rubber bush and broad rubber or fiber w...
by mlb50
Wed Mar 17, 2021 5:13 am
Forum: Tech
Topic: What length turn signals?
Replies: 8
Views: 2504

Re: What length turn signals?

If the bike has the stock exhaust muffler, that tends to deposit soot on the right turn indicator. Looks a tad crappy after a while. I think the longer the stem the better.
by mlb50
Sat Mar 13, 2021 2:24 am
Forum: Project bikes
Topic: I'd like to ride this some day
Replies: 20
Views: 5491

Re: I'd like to ride this some day

Main issue with airfilters is the close proximity of the rear frame tubes. Depending on what carb you fit, its inevitable that the air intake tube for a filter has to get past the junction of the frame tubes. You may have to fit an adapter between the carb intake and wherever under the seat area tha...
by mlb50
Fri Mar 12, 2021 3:59 am
Forum: Project bikes
Topic: I'd like to ride this some day
Replies: 20
Views: 5491

Re: I'd like to ride this some day

MX is a great dirt bike. Go with a big Mikuni or 32mm Amal. Really must recommend a motor tear down to check everything and replace the stock conrod with a Carillo. The stock rod can and will snap wrecking the cases. Plenty of spares and performance parts for B50s, depends what you want to do with i...
by mlb50
Fri Mar 12, 2021 3:14 am
Forum: Project bikes
Topic: I'd like to ride this some day
Replies: 20
Views: 5491

Re: I'd like to ride this some day

A nice barn find. The carb adapter is aftermarket, probably to take a Mikuni stub flange which was wider than the Amal. You can remove that and revert to the stock Amal 930 or (932 if its a MX motor) Check the engine number on the left upper crankcase. That will denote the model ie. T for the trail ...
by mlb50
Sun Mar 07, 2021 1:59 am
Forum: Tech
Topic: B50mx Second Start Up Running Better but??"s
Replies: 19
Views: 3965

Re: B50mx Second Start Up Running Better but??"s

You really need to get a timing strobe light on to check the timing where its at idle and advance on revving up. Static settings are not sufficient to ensure accurate timing.
by mlb50
Sat Feb 20, 2021 1:37 am
Forum: Tech
Topic: Best Ball Bearing Brands?
Replies: 9
Views: 3531

Re: Best Ball Bearing Brands?

We built a lot of high speed dynos, some with inertia mass of 5 tons or more rotating to 2,000 rpm. We only ever used SKF roller bearings, never had a problem. As we had a trade account, I purchased SKF for all my British bike rebuilds. Never had a problem. And there are very reputable other brands,...
by mlb50
Mon Feb 15, 2021 1:04 am
Forum: Tech
Topic: Engine Started 2nd Kick But Have ?s
Replies: 3
Views: 2411

Re: Engine Started 2nd Kick But Have ?s

I assume you have the Amal jetted near to the standard B50 spec? What can cause backfiring / misfiring is when the motor is cold and no choke and I guess its winter in the US. If you don't have a choke slide fitted that can be an issue. To check if this is a cold weakness mixture, when the motor is ...
by mlb50
Thu Feb 04, 2021 1:40 am
Forum: Tech
Topic: B50 hydraulic drum brake
Replies: 58
Views: 13758

Re: B50 hydraulic drum brake

According to Mead & Tomkinson, the intention of the hydraulic conversion was to reduce strain on the hand applying the front brake during endurance racing. One can only assume it worked as good if not better than the OEM cable set up. I found on my B50, the cable was the single biggest source of fle...
by mlb50
Mon Jan 11, 2021 1:15 am
Forum: Videos
Topic: Another Single movie
Replies: 2
Views: 3451

Another Single movie

Man rides T25 on a nice day. Makes the big mistake of turning it off and waits for God to allow it to re-start.

https://www.youtube.com/watch?v=1i-Hc5fqdqQ
by mlb50
Fri Jan 08, 2021 3:51 am
Forum: Videos
Topic: Hilarious old 70s BSA singles movie
Replies: 2
Views: 3093

Hilarious old 70s BSA singles movie

Most of this is BSA Victors - 3 guys decide to ride across the USA, find the roads boring so go bush and end up in Panama. The ending is totally weird.

https://www.youtube.com/watch?v=XtP40UdARwg
by mlb50
Tue Dec 15, 2020 2:13 am
Forum: News
Topic: Stan Millard
Replies: 20
Views: 9293

Re: Stan Millard

Sorry to hear. Stan was an inspiration for improving the B50, very knowledgeable and excellent mechanical skills. A real talent that will be missed. RIP Stan.
by mlb50
Wed Dec 09, 2020 2:57 am
Forum: Tech
Topic: Which Spark Plug?
Replies: 16
Views: 3532

Re: Which Spark Plug?

I always use NGK. And Iridium as I find they never foul the tip and seem to tolerate varying mixtures.
by mlb50
Wed Dec 02, 2020 1:56 am
Forum: Parts & Bikes wanted
Topic: B50 Tank & Side panels
Replies: 6
Views: 2376

Re: B50 Tank & Side panels

I have found a picture of a B50 MX with the tap situated. I think the one advertised is B25, but you really need to see the tank from the side view.
Zoom in on the tap and you can see the problem if the tap is forward and vertical as per B25.
B50 small alloy tank
B50 small alloy tank
by mlb50
Tue Dec 01, 2020 3:32 am
Forum: Parts & Bikes wanted
Topic: B50 Tank & Side panels
Replies: 6
Views: 2376

Re: B50 Tank & Side panels

Looks like the small capacity tank (2 gallon). I got a new one from India, it was OK....but while B25 and B50 tanks are identical except that the fuel taps on the B25 are vertical on the bottom, the B50 tank needs the fuel taps on the corner at an angle so as to clear the rocker box. My replica 2 ga...
by mlb50
Sat Nov 28, 2020 9:04 am
Forum: Tech
Topic: Brake master cylinder.
Replies: 7
Views: 2458

Re: Brake master cylinder.

In my experience - Yes it will match the switch body from a 71 onward conical hub brake. Note there are 2 long screws and 2 shorter ones.
by mlb50
Mon Nov 16, 2020 6:06 am
Forum: Tech
Topic: Setting Valve Clearance
Replies: 8
Views: 2569

Re: Setting Valve Clearance

There's a couple of ways you can do this. In simple terms, the cams have a base circle - around about half of the circular motion where the tappet is relaxed. When the piston comes up on the compression stroke, the inlet cam is coming off the lift lobe and down to the base circle. The exhaust cam is...
by mlb50
Fri Oct 23, 2020 12:40 am
Forum: Tech
Topic: Ok..now its got me mad..spark plug
Replies: 11
Views: 3204

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

Guessing there is no choke on this? Do you know the size of the Pilot Jet? It could be 17, 19, 21 or 23. Bigger is richer, this makes a real difference to idle and slow speed running. Float level should be checked - this must be between 1.5mm to 2mm from the upper edge of the float to the rim of the...
by mlb50
Wed Oct 07, 2020 3:30 am
Forum: Tech
Topic: Web Cam tr5mx
Replies: 1
Views: 1062

Re: Web Cam tr5mx

In the jargon of the day...that's a hot cam. I think it will go ape shit over 4,000rpm. Don't forget to adjust carburetion and exhaust to tune it all in.
by mlb50
Fri Oct 02, 2020 8:27 am
Forum: Tales Of Woe
Topic: When you're at your Wits End ..it could be worse
Replies: 5
Views: 2660

Re: When you're at your Wits End ..it could be worse

Ha! Similar experience in 1980. Horsham, East Sussex. I was older then than the local lads and had a A65 Thunderbolt. Young lad Manky Al had just got a B25 Starfire and was very pleased with it and himself. He picked me up after work (King & Barnes Real Ales) on the bike and sitting on the back we s...
by mlb50
Wed Sep 30, 2020 6:20 am
Forum: Tech
Topic: TR5mx Fork/Steering Stem
Replies: 16
Views: 3678

Re: TR5mx Fork/Steering Stem

That can be straightened. Take to an engineering shop and ask that they cold work it. No heat. Should be able to press that true in 5 minutes.
by mlb50
Wed Sep 23, 2020 4:43 am
Forum: Tech
Topic: Chinese Carburetor
Replies: 4
Views: 1648

Re: Chinese Carburetor

There are dozens of varieties of "Chinese" carburetors. Most are copies of Mikuni and Keihin and there are licensed versions of both. Ebay has lots of cheap versions. The risk is that copy models do not necessarily conform to a large single cylinder 4 stroke. Most 2 wheelers in Asia are sub-250cc. T...
by mlb50
Sun Aug 16, 2020 2:52 am
Forum: Tech
Topic: 1974 Fork Rebuild For MX
Replies: 3
Views: 1202

Re: 1974 Fork Rebuild For MX

Does the fork still have the 2 studs on the upper end (mudguard mount)? If so you may be able to fabricate a tension arm to the front of the brake plate which would need a welded lug with a through stud, unless the one already there could work?
by mlb50
Fri Aug 14, 2020 5:32 am
Forum: Tech
Topic: 1974 Fork Rebuild For MX
Replies: 3
Views: 1202

Re: 1974 Fork Rebuild For MX

Without spending a ton of money re-engineering them, you can fit progressive springs and synthetic fork oil. Weight of oil depends on bike loaded mass and how much damping you want.
by mlb50
Mon Aug 10, 2020 3:53 am
Forum: Tech
Topic: encapsulated crank bearing
Replies: 3
Views: 1432

Re: encapsulated crank bearing

For suppliers, often it only what is available now for modern machinery. Bearings types from 50 years ago may no longer be relevant so they can only offer what is the nearest equivalent. Fully sealed wheel bearings are a big improvement to the originals. I fit one side sealed bearing to the gearbox ...
by mlb50
Sun Aug 09, 2020 3:19 am
Forum: Tech
Topic: encapsulated crank bearing
Replies: 3
Views: 1432

Re: encapsulated crank bearing

If your motor is B50, none of the main bearings should have integrated seals. They need oil flow.
by mlb50
Sun Aug 09, 2020 3:17 am
Forum: Tech
Topic: LED Headlight/Zener Diode Question
Replies: 3
Views: 1481

Re: LED Headlight/Zener Diode Question

With a good battery, good wiring, earths and the correct heat sink, the stock zener will be fine. PS - did you get negative polarity LEDs?
by mlb50
Mon Aug 03, 2020 8:02 am
Forum: Tech
Topic: Off-throttle hanging revs
Replies: 25
Views: 4727

Re: Off-throttle hanging revs

Is the needle bent? I had this "hanging high idle" on a Trident and it drove me nuts until I found the culprit. Slide goes down, needle stays up a wee bit and totally messes with the mixture.
by mlb50
Sat Jul 04, 2020 2:36 am
Forum: Project bikes
Topic: 74 TR5 MX Project For Ken - Finished With Video
Replies: 133
Views: 35124

Re: 74 TR5 MX Project For Ken

I think the points cover screws are 2BA.
by mlb50
Fri Jun 19, 2020 2:24 am
Forum: Tech
Topic: Engine Builder
Replies: 7
Views: 2448

Re: Engine Builder

Try Raber's in San Jose. Lots of good British experience, parts and service.

www.rabers.com
by mlb50
Thu Jun 04, 2020 2:04 am
Forum: Tech
Topic: Rear Hub?
Replies: 2
Views: 1201

Re: Rear Hub?

Yes, there should be a threaded collar. Its job is to retain the bearing and keep grease on the inside. Its a ring with peg holes to tighten it up.
by mlb50
Mon May 04, 2020 1:39 am
Forum: Tech
Topic: B50MX cam in a B25 and Big bore ideas.
Replies: 10
Views: 3050

Re: B50MX cam in a B25 and Big bore ideas.

The B50 crankcases are significantly different to the B25 in that the driveside cases are duplex roller bearings and have breather ports. Converting B25 to a B50 would as you mentioned require a significant amount of work with doubtful longevity.