www.b50.org

kommando

Auto advance wears and then jams advanced which keeps revs up until it frees.

kommando

C3, never changed a thrustwasher unless it was badly worn, as from the 1965 G series engine onward the mainshaft no longer moves with the clutch lever it does not wear.

kommando

2 sets of dealers, 2 engineering offices, 2 part numbering systems, uncommon parts, common parts etc etc.

kommando

Its 2 pickup coils and 2 magnets, same for both the singles and twins, the Boyer box is also the same so fully wasted spark in singles and twins. The electronics averages the 2 signals so guaranteeing a 360 degree gap between sparks unlike 2 sets of points points, great for twins but not needed for ...

kommando

That looks like the Boyer ignition setup. It's wasted spark so fired every 360 degrees. The timing goes off with low battery voltage or a corroded connector including earth path.

kommando

Other than assembling and truing the crank the rest is relatively easy.

kommando

The third bearing is not needed, it provides location for the crank so the endfloat, but you can do this with shims. If you still have any concerns then just got the heavy duty roller bearings with the E added to the bearing number.

kommando

Boyer MK4 matches the low voltage performance of the Pazon.

kommando

V3 is a vibration spec, nothing to do with internal clearances, at the time Hoffman used dots or etched circles to denote internal clearances. C3 is the default internal clearance for a bearing set in alloy and Hoffman developed the concept using 3 circles or dots.

kommando

was there an ally clamp fitted to any BSA models prior to B50 say Victor?

No

kommando

Stick it in 4th and put a heavy boot on a heavy persons foot on the rear brake lever, some blue/green loctite but not red is good insurance.

kommando

I put a piece of inner tube under the switch.

kommando

You are going to have to open the gearbox and inspect all the parts, I would be looking first for missing teeth. Even in neutral the gears rotate but transmit no power so my guess is a missing tooth on one of the gears or one side of a gear tooth is eroded.

kommando

Your bike was built in 1970 but was built to 71 model year specs, call up a supplier and describe it as a 70 and not a 71 and unless you quote part numbers the 70 model parts will be supplied. I have 2 69 model year Victors both built in 68 but they are 69's and I use the 69 parts books to order the...

kommando

Looked at your location and thought of Speed & Sport who have a good reputation and I found https://www.speedandsport.com/index.php/parts/tires-and-wheels/rims-excel-non-dimpled/ Excel rims are possibly the highest-quality alloy rims on the market. They are anodized with a very-bright, almost-polish...

kommando

I thought the stem length was longer on the Square barrel, will check in the garage tomorrow, although I was trying to do it today so no promises.

kommando

Excel rims can be supplied undrilled, worth asking if they can also come without dimples. Good wheel builders can drill holes to suit your application.

kommando

Yes, wrong cover. LOL

kommando

koncretekid wrote: ↑
Fri May 08, 2020 11:33 am
Outer timing cover should not be affected by the crank seal, to my knowledge.

Everything being factory then it should still work, but if in the past the end of the B44 crank has been hammered to a balloon and then shortened to bring back to size then it could miss the B25 seal.

kommando

No, you also need to check the slot position for the points wires, the type of hole for the crank end seal as the B25 version has a circlip which moves the seal out further which risks it not fitting a B44 crank. There were other detail changes as every year there were changes.

kommando

The temp going back to the tank is useful but not the whole story. http://www.nortons.dk/doc/lubricants.pdf In summary if you have a hot spot in an engine such as next to the exhaust valve then oil that passes through this can be degraded quickly and it never recovers. This may be only a small amoun...

kommando

Info was for wrong bike.

kommando

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. You don't need the extra ball bearing, it carries no...

kommando

BSA air guns are still in Armoury Road, there are a few on the machine tool side still going and I think a sintered products concern.

kommando

My b25 project has been stood a couple of months and yesterday was the Big first start day, anyway after the usual double checks of the timing and fuel I found it difficult to kick, on dropping the sump plate I got approx a litre of oil 1 litre in a couple of months is nothing to worry about. I did...

kommando

NEB made the clutch.

kommando

I do this, the pic is of a Norton pump but it works on all Unit Single pumps. I had seen it done by AMR as part of their Norton mods but with O rings but I thought X rings would double the chances of a seal.

kommando

The Indians sell a steel tank that is a copy of the sculpted fibre glass tank. As long as you buy from royal choppers or pummy8081 on eBay you should be ok.

kommando

AE stands for Associated Engineering, a group that owned Hepworth & Gandage who made Hepolite pistons.

kommando

Powdercoating works better on cast iron hubs, I never use it on alloy hubs.

kommando

Better low end grunt, lifts the front wheel in 1st and 2nd on mine even with high gearing, runs out of puff about 5k unless you adjust can timing a bit, think you aim for inlet opening mid point of 105 for better top end.

kommando

It cures the problem of the filler cap hitting the inner thigh if you straddle the bike to kick, whether BSA had this in mind is anyone's guess.

kommando

Only difference could be neck height as without the fibreglass cover it can be lower as it was in 70 when all models were without fibreglass.

kommando

The early ones had E stamped for Victor Enduro as opposed to the GP cam, after the GP was finished the E was dropped as the production line only worked with 1 B44/B25 cam profile until the B50MX, maybe the V was for the GP, never seen one to know. The WDB40 cam was so different in profile it identif...

kommando

The camwheel is detachable and could be put back on the wrong way round, there is normally on the later cams a V on the other side as the timing mark, so what marks have you got on the other side.

kommando

Normal, its called wet sumping, the more you ride the bike the less of an issue. When these bikes were daily riders the problem never came up.

kommando

Looking at your first photo of your crank its a B44, the flywheels are of different widths, plus the driveside mainshaft has full length splines not the short splines of the B50, because of the extra driveside main bearing. Now the mainshaft could have been changed but the different flywheel widths ...

kommando

B50 flywheel s are the same width, B44 flywheels have different widths, timing holes are different by a few degrees, both cranks will fit B44 cases.

kommando

Those are main bearings for sale, what is required is the needle roller big end bearing.

kommando

Unless you have a good way of finding TDC like using a stop against the piston top then you are wasting your time checking at this stage.

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