Search found 1840 matches

by kommando
Wed Oct 21, 2020 9:34 pm
Forum: Tech
Topic: B50 valve lifter to bare casting.
Replies: 36
Views: 1498
Flag: Ireland

Re: B50 valve lifter to bare casting.

Turns out the B40 copper gasket is thicker then the b44. Out of the factory in the spares depts they are both the same thickness. Once the aftermarket got on the case there were B44 gaskets made from a thinner gauge and labelled as B40/B44. I have posted this before. https://www.bsaunitsingles.com/...
by kommando
Thu Oct 01, 2020 7:53 pm
Forum: Tech
Topic: tightening head nuts sequence
Replies: 27
Views: 1017
Flag: Ireland

Re: tightening head nuts sequence

If there was liquid below the stud and it had nowhere else to go so hydraulic pressure is generated when the stud is screwed in.
by kommando
Wed Sep 30, 2020 8:46 pm
Forum: Tech
Topic: Anti wet dumping valves.
Replies: 6
Views: 177
Flag: Ireland

Re: Anti wet dumping valves.

I modified mine so a light blow would open it like the Velocette valve, that plus always priming the pipes with means no issues.
by kommando
Tue Sep 29, 2020 7:48 pm
Forum: Tech
Topic: tightening head nuts sequence
Replies: 27
Views: 1017
Flag: Ireland

Re: tightening head nuts sequence

If the hole was the correct depth but the thread was not tapped far enough then turning the stud in past the end of the thread will expand the hole. Result is a cracked crankcase.
by kommando
Mon Sep 28, 2020 8:05 pm
Forum: Tech
Topic: tightening head nuts sequence
Replies: 27
Views: 1017
Flag: Ireland

Re: tightening head nuts sequence

No loctite, hole not deep enough or stud sized wrong, check the relative levels of the studs at their tops which may give a clue.
by kommando
Mon Sep 28, 2020 12:24 pm
Forum: Tech
Topic: Rickman Framed B44
Replies: 11
Views: 530
Flag: Ireland

Re: Rickman Framed B44

The most likely source of records is

http://www.metisse-motorcycles.com/contact-us/

But that depends on how well the records were looked after during the ownership changes.
by kommando
Fri Sep 25, 2020 9:50 pm
Forum: Tech
Topic: Rickman Framed B44
Replies: 11
Views: 530
Flag: Ireland

Re: Rickman Framed B44

Brass soldering is better known as brazing, a nickel bronze for 531. Any joint that has been brazed cannot be welded later due to contamination but if it's never been brazed then you can weld but the heat will reduce the strength of the tube in that area so brazing is better.
by kommando
Thu Sep 24, 2020 7:47 am
Forum: Tech
Topic: B25 Rough Running..missing slightly
Replies: 17
Views: 925
Flag: Ireland

Re: B25 Rough Running..missing slightly

Now you just have to worry about the Trispark faiing, not unknown. Never trust any electronics stuffed into a hot small space.
by kommando
Tue Sep 22, 2020 8:16 am
Forum: Tech
Topic: B25SS Piston
Replies: 7
Views: 383
Flag: Ireland

Re: B25SS Piston

You cannot apply logic to the relationship between BSA and Triumph, they were separate organisations and rival's even when told to act the opposite.
by kommando
Sat Sep 19, 2020 9:47 am
Forum: Tech
Topic: New Premier Amal For tr5mx (Jetting)
Replies: 2
Views: 181
Flag: Ireland

Re: New Premier Amal For tr5mx (Jetting)

Premiers seem to run lean on the pilot compared to pre premiers, so go for 19 pilot which is same as old 30 pilot bush.
by kommando
Sat Sep 19, 2020 9:45 am
Forum: Tech
Topic: Oil pump feed
Replies: 1
Views: 187
Flag: Ireland

Re: Oil pump feed

Gear pumps push a lot better than they pull, so no restrictions before the pump is best.
by kommando
Thu Sep 10, 2020 10:41 pm
Forum: Tech
Topic: B25 Rough Running..missing slightly
Replies: 17
Views: 925
Flag: Ireland

Re: B25 Rough Running..missing slightly

Yes, at tickover revs if you advance the timing the revs increase. Digital Pazon curve with idle stabilisation. Analogue Pazon's don't have this feature. https://www.accessnorton.com/proxy.php?image=http%3A%2F%2Fwww.pazon.com%2Ffiles%2FAL2-advance.jpg&hash=9963d022991775b2ac49f5f0e19a03d7 Just read ...
by kommando
Thu Sep 10, 2020 1:40 pm
Forum: Tech
Topic: crankshaft washer help
Replies: 3
Views: 289
Flag: Ireland

Re: crankshaft washer help

If it was the crankshaft washer the ID would be just over 19.05mm ie 3/4".
by kommando
Thu Sep 10, 2020 1:38 pm
Forum: Tech
Topic: B25 Rough Running..missing slightly
Replies: 17
Views: 925
Flag: Ireland

Re: B25 Rough Running..missing slightly

The Tri spark does not spark 3 times, the Tri part comes from it being initially designed to fit a Triumph Trident.

What it does have is an idle stabilisation curve, as the revs drop below 1000 rpm the timing is advanced to keep the revs up.
by kommando
Mon Sep 07, 2020 8:44 am
Forum: Tech
Topic: B25 Rough Running..missing slightly
Replies: 17
Views: 925
Flag: Ireland

Re: B25 Rough Running..missing slightly

May just be the different advance curve, have you strobbed it to check the fully advanced point is correct.
by kommando
Tue Sep 01, 2020 7:53 pm
Forum: Tech
Topic: B50 valve lifter to bare casting.
Replies: 36
Views: 1498
Flag: Ireland

Re: B50 valve lifter to bare casting.

My B40 has an O ring, assumed they were standard.
by kommando
Tue Sep 01, 2020 8:14 am
Forum: Tech
Topic: B50 valve lifter to bare casting.
Replies: 36
Views: 1498
Flag: Ireland

Re: B50 valve lifter to bare casting.

Looks plugged to me, someone had an oil leak and preferred a dodgy knee ?
by kommando
Tue Aug 25, 2020 6:26 am
Forum: Parts & Bikes wanted
Topic: B50SS/B50T wanted
Replies: 12
Views: 795
Flag: Ireland

Re: B50SS/B50T wanted

If you have a bill of sale for the US side of The sale you can apply for retrospective NOVA, you have to pay VAT on the bill of sale value or have proof of was paid on import.
by kommando
Sat Aug 15, 2020 2:52 pm
Forum: Tech
Topic: B25SS Burning Oil
Replies: 28
Views: 1079
Flag: Ireland

Re: B25SS Burning Oil

the (standard) piston was a Starfire item not an SS Gold Star One and the same anyway so leave as is. When is the bike smoking, on acceleration means its likely to be rings so hone and fit new rings, deceleration is guides and likely to be worn inlet guide. Do not jump to a rebore unless the bore i...
by kommando
Sat Aug 15, 2020 2:46 pm
Forum: Tech
Topic: flywheel balancing
Replies: 15
Views: 784
Flag: Ireland

Re: flywheel balancing

Static balancing is for the piston and 1/2 ish of the con rod, it only changes the angle the weight is applied at, the weight of the inbalance is unchanged. Dynamic balancing is to set the weights of the 2 sides of the crank to be equal to eliminate the rocking side to side motion, its pointless mak...
by kommando
Sat Aug 15, 2020 2:35 pm
Forum: Tech
Topic: 1970 B25 side panel Oddie fasteners: long or short
Replies: 2
Views: 319
Flag: Ireland

Re: 1970 B25 side panel Oddie fasteners: long or short

For bikes with both side covers you need 3 short and 1 long, for those with the toolbox cover only its one short and one long with the long at the front top position. A 70 B25 only should have the toolbox cover, the oil tank used was the Victor oil tank with no brackets to hold the oddie clips and n...
by kommando
Fri Jul 31, 2020 8:26 pm
Forum: Tech
Topic: Off-throttle hanging revs
Replies: 25
Views: 1664
Flag: Ireland

Re: Off-throttle hanging revs

Auto advance wears and then jams advanced which keeps revs up until it frees.
by kommando
Thu Jul 30, 2020 7:33 am
Forum: Tech
Topic: C3 sleeve gear bearing
Replies: 1
Views: 337
Flag: Ireland

Re: C3 sleeve gear bearing

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.
by kommando
Sat Jul 18, 2020 7:10 am
Forum: Tech
Topic: Thread : BSC vs BA ?
Replies: 10
Views: 960
Flag: Ireland

Re: Thread : BSC vs BA ?

2 sets of dealers, 2 engineering offices, 2 part numbering systems, uncommon parts, common parts etc etc.
by kommando
Sun Jun 21, 2020 12:10 pm
Forum: Tech
Topic: 441 Victor resurection
Replies: 45
Views: 4213
Flag: Ireland

Re: 441 Victor resurection

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 ...
by kommando
Sat Jun 20, 2020 8:41 am
Forum: Tech
Topic: 441 Victor resurection
Replies: 45
Views: 4213
Flag: Ireland

Re: 441 Victor resurection

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.
by kommando
Sat Jun 20, 2020 8:39 am
Forum: Tech
Topic: Engine Builder
Replies: 7
Views: 1086
Flag: Ireland

Re: Engine Builder

Other than assembling and truing the crank the rest is relatively easy.
by kommando
Tue Jun 16, 2020 11:35 pm
Forum: Project bikes
Topic: LOBE 2 20-21
Replies: 47
Views: 3937
Flag: Ireland

Re: LOBE 2 20-21

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.
by kommando
Tue Jun 09, 2020 7:38 am
Forum: Tech
Topic: B25 1969 starting problems
Replies: 10
Views: 1119
Flag: Ireland

Re: B25 1969 starting problems

Boyer MK4 matches the low voltage performance of the Pazon.
by kommando
Tue Jun 09, 2020 7:36 am
Forum: Tech
Topic: Crankshaft bearings
Replies: 4
Views: 825
Flag: Ireland

Re: Crankshaft bearings

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.
by kommando
Mon Jun 01, 2020 3:47 pm
Forum: Tech
Topic: B40 triple clamp material
Replies: 13
Views: 1457
Flag: Ireland

Re: B40 triple clamp material

was there an ally clamp fitted to any BSA models prior to B50 say Victor?
No
by kommando
Sun May 24, 2020 11:39 am
Forum: Tech
Topic: B50 rotor nut.
Replies: 9
Views: 2047
Flag: Ireland

Re: B50 rotor nut.

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.
by kommando
Wed May 20, 2020 10:55 pm
Forum: Tech
Topic: pattern tricon switch
Replies: 11
Views: 1218
Flag: Ireland

Re: pattern tricon switch

I put a piece of inner tube under the switch.
by kommando
Mon May 18, 2020 10:03 am
Forum: Tech
Topic: B25T Gearbox Clicking – What Sound is This?
Replies: 14
Views: 1495
Flag: Ireland

Re: B25T Gearbox Clicking – What Sound is This?

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.
by kommando
Wed May 13, 2020 9:59 am
Forum: Parts & Bikes wanted
Topic: 1970 OIF B25 parts.
Replies: 6
Views: 1075
Flag: Ireland

Re: 1970 OIF B25 parts.

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...
by kommando
Tue May 12, 2020 6:05 pm
Forum: Tech
Topic: 36 Hole Front Hub Options
Replies: 17
Views: 1686
Flag: Ireland

Re: 36 Hole Front Hub Options

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...
by kommando
Tue May 12, 2020 6:01 pm
Forum: Tech
Topic: 350 and 441 use the same Intake valve
Replies: 4
Views: 713
Flag: Ireland

Re: 350 and 441 use the same Intake valve

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.
by kommando
Tue May 12, 2020 2:20 pm
Forum: Tech
Topic: 36 Hole Front Hub Options
Replies: 17
Views: 1686
Flag: Ireland

Re: 36 Hole Front Hub Options

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.
by kommando
Fri May 08, 2020 4:47 pm
Forum: Tech
Topic: Outer timing cover equivalences
Replies: 10
Views: 1381
Flag: Ireland

Re: Outer timing cover equivalences

Yes, wrong cover. LOL