Search found 225 matches

by Momus
Mon Jul 26, 2021 4:40 pm
Forum: Tech
Topic: Improved oil pipes T25 16/71
Replies: 6
Views: 159

Re: Improved oil pipes T25 16/71

The factory cleaners designed that while the engineer was at the pub.
by Momus
Wed Jul 07, 2021 10:04 am
Forum: Parts & Bikes wanted
Topic: WANTED C15 B40 Distributor
Replies: 11
Views: 3792

Re: WANTED C15 B40 Distributor

Momus wrote: Tue Jun 30, 2020 10:50 am I'm after a C15)B40 distributor for an early scramble project. Guts can be missing and condition is relatively unimportant: it will be there for looks

Please message me.
Anyone have a dissy?
by Momus
Fri Jul 02, 2021 7:34 am
Forum: Tech
Topic: Carburettor choice for b50
Replies: 40
Views: 1511

Re: Carburettor choice for b50

baz wrote: Wed Jun 30, 2021 1:11 pm
Momus wrote: Wed Jun 30, 2021 9:59 am Smart tuners try several options; not convince themselves without testing.
I guess I'm not smart enough then
Likely if you don't at least try a VM Mikuni.

The British motorcycle industry went belly up with that thinking- 50 years ago. :laugh
by Momus
Wed Jun 30, 2021 9:59 am
Forum: Tech
Topic: Carburettor choice for b50
Replies: 40
Views: 1511

Re: Carburettor choice for b50

Smart tuners try several options; not convince themselves without testing.
by Momus
Mon Jun 14, 2021 3:32 am
Forum: Tech
Topic: B25 mikuni
Replies: 13
Views: 1286

Re: B25 mikuni

Hi there, has anyone fitted a mikuni to the 250 engine, if so what type and settings? [/qwuote] MikuniOz sell a prejetted VM30 that works very well on the 250 Beezers. 26 mm is way too small: the 30 will give you more everywhere. The Mikuni is the superior spigot mount so insulated from vibration, ...
by Momus
Sun May 16, 2021 6:57 am
Forum: Tech
Topic: Oil line not connected
Replies: 9
Views: 1768

Re: Oil line not connected

It 'tweren't' plugged by the factory. It was plugged by whomever installed that oil line from the ex-oil pressure fitting used on the B25. And, is that the plastic hose from a refrigerator ice maker? I'll bet a dollar to a donut it is! Now, bearing in mind the plastic in that hose is low grade el-c...
by Momus
Mon May 10, 2021 10:29 am
Forum: Tech
Topic: TR5T timing issues
Replies: 20
Views: 2271

Re: TR5T timing issues

Your cam is timed incorrectly for the sparx. <205
by Momus
Mon Apr 19, 2021 6:07 am
Forum: Project bikes
Topic: LOBE 2 20-21
Replies: 260
Views: 55379

Re: LOBE 2 20-21

Hmmmmm <201 coming to the yokes DSCN2415.jpeg uper and lower yoke will be very different. and the main thing on this front end: the two stanchions are much wider , say more off the front tire than the ones on the Goldie. DSCN2414.jpeg at the Goldie, the stanchions have a wideness of 152 mm, makes 2...
by Momus
Mon Apr 05, 2021 5:24 pm
Forum: Project bikes
Topic: LOBE 2 20-21
Replies: 260
Views: 55379

Re: LOBE 2 20-21

Another method is to drill a 22 mm hole -for 520- in a square block 100 mm long a hole on it self is not satisfying for MX use, - it needs a high slot because two reasons 1. the long way of suspension. more than 200 mm of travel the rear wheel is doing. so the angel where the chain is coming on to ...
by Momus
Sun Apr 04, 2021 9:16 am
Forum: Project bikes
Topic: LOBE 2 20-21
Replies: 260
Views: 55379

Re: LOBE 2 20-21

beat wrote: Mon Mar 29, 2021 7:46 pm DSCN2396.jpeg
DSCN2397.jpeg <212
Another method is to drill a 22 mm hole -for 520- in a square block 100 mm long and mount it with a couple of bolts on a flange plate.
by Momus
Mon Mar 22, 2021 4:25 am
Forum: Project bikes
Topic: Hammer of the Gods - B50SS Project
Replies: 158
Views: 73519

Re: Hammer of the Gods - B50SS Project

The rim cracked at the seam. Here is a pic of what it looks like on the inside. I may be replacing the front rim as well. There aren't any cracks but I don't have a lot of faith in these unbranded rims. These were supposedly good quality made in Italy rims. https://live.staticflickr.com/65535/51059...
by Momus
Fri Mar 19, 2021 5:51 am
Forum: Project bikes
Topic: Hammer of the Gods - B50SS Project
Replies: 158
Views: 73519

Re: Hammer of the Gods - B50SS Project

It could very well be the seam where the rim was welded but it wasn't there when I built the wheel. I will know more once I take it apart. I think it probably cracked along the weld. I'm not sure if it happened due to the spike that went into the tire or if it fatigued but either way it needs to be...
by Momus
Thu Mar 18, 2021 4:50 am
Forum: Project bikes
Topic: LOBE 2 20-21
Replies: 260
Views: 55379

Re: LOBE 2 20-21

minetymenace wrote: Tue Mar 16, 2021 10:22 am ....and as your oil gets more acidic with use, the dissimilar metals and electrolyte will create a cell!
How many volts?
by Momus
Tue Mar 16, 2021 6:34 am
Forum: Project bikes
Topic: 1972 CCM #23
Replies: 12
Views: 3370

Re: 1972 CCM #23

By "the front of the frame" I assume you mean the headstock with the serial number. This is a picture of the numbers taken soon after I purchased the bike. Also a picture taken from my thread back in 2012 where I asked for "Help identifying this frame". This is short 5's picture of his frame. Show ...
by Momus
Thu Mar 11, 2021 2:01 pm
Forum: Project bikes
Topic: LOBE 2 20-21
Replies: 260
Views: 55379

Re: LOBE 2 20-21

beat, the engine front mount is a long bar (with the weight of the engine in the middle) whose ends are mounted in the frame with thin rubber bushes. It looks to me that the engine might bounce around quite a bit, as much on the bar as on the bushes....and the disc between the spacer and the silent...
by Momus
Wed Mar 10, 2021 10:25 am
Forum: Project bikes
Topic: LOBE 2 20-21
Replies: 260
Views: 55379

Re: LOBE 2 20-21

yes skippy, it is ( was ) a 250 BSA. -- just the right thing for a elderly fellow like me... <982 a word to this rubbers I do use on it: DSCN2325.jpeg DSCN2327.jpeg the valve lifter nearly finished: DSCN2328.jpeg DSCN2329.jpeg DSCN2330.jpeg . . when the cable will be made, it will get the final for...
by Momus
Sun Mar 07, 2021 2:39 pm
Forum: Tech
Topic: B50mx Second Start Up Running Better but??"s
Replies: 19
Views: 3965

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

Thanks for all the replies! Now you have me worried about the timing. I fitted an Electrex ignition and installed as instructed, find tdc then line up the blue marks on stator and rotor. What could I have done wrong :shock: Valve timing I also think I have correct but this was my biggest concern as...
by Momus
Sat Mar 06, 2021 5:21 pm
Forum: Tech
Topic: B50mx Second Start Up Running Better but??"s
Replies: 19
Views: 3965

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

Your ignition timing is way retarded.
by Momus
Thu Mar 04, 2021 1:27 pm
Forum: Project bikes
Topic: LOBE 2 20-21
Replies: 260
Views: 55379

Re: LOBE 2 20-21

Hello Beat , I see a long long ...swinging arm for power transmission and efficient road handling , a frame which stiffness won't be too high to leave it bend with elasticity as they say : https://motodna.net/motogp-tech-talk-swingarms/ Your frame grow up continuously, like in a movie : it could se...
by Momus
Mon Mar 01, 2021 4:58 am
Forum: Off topic
Topic: Slickshift
Replies: 3
Views: 3204

Re: Slickshift

Probably copied from JAWA.
by Momus
Fri Feb 26, 2021 3:50 pm
Forum: Project bikes
Topic: LOBE 2 20-21
Replies: 260
Views: 55379

Re: LOBE 2 20-21

1" NB pipe, Schedule 5 or 10 by the 33 point something diameter.
by Momus
Sat Feb 20, 2021 3:17 pm
Forum: Tech
Topic: Best Ball Bearing Brands?
Replies: 9
Views: 3531

Re: Best Ball Bearing Brands?

Nachi bearings are as good as anything.

H onda uses them as OE; they are absolutely top notch.

Their metallurgy and steel cleanliness is unsurpassed.

NTN is also top tier.
by Momus
Fri Feb 19, 2021 9:02 am
Forum: Project bikes
Topic: LOBE 2 20-21
Replies: 260
Views: 55379

Re: LOBE 2 20-21

but it gos easier by spacers when the two fraim tubes are passing in a wider distance there ! And engine dismantling is easier to do as well when spacers are to both side of the engine mount. :mrgreen: :mrgreen: Boris has 5 mm or so spacer allowance at each mount and enough room vertically to pull ...
by Momus
Thu Feb 18, 2021 4:50 am
Forum: Project bikes
Topic: LOBE 2 20-21
Replies: 260
Views: 55379

Re: LOBE 2 20-21

002.JPG We sometimes wonder why a certain thing was made the way it was. Occam's razor usually provides the answer simply and parsimoniously: the available material was used and forced a compromise. The infamous BSA unit single heavily offset forward engine mount on The Boris Johnson. There is no w...
by Momus
Thu Feb 18, 2021 3:39 am
Forum: Project bikes
Topic: LOBE 2 20-21
Replies: 260
Views: 55379

Re: LOBE 2 20-21

Glycodur flange.jpg
Glycodur flange.jpg (6.39 KiB) Viewed 8031 times
Glycodur F series-

I've used these flanged teflon bronze space savers in similar applications.
by Momus
Tue Feb 16, 2021 10:30 am
Forum: Project bikes
Topic: LOBE 2 20-21
Replies: 260
Views: 55379

Re: LOBE 2 20-21

Rugged old frame that one.

Not Ti- it's very rarely brazed.

The tubes look press or sand bent from a heavy wall thickness.

Likely 304 stainless as well, if non magnetic; possibly some of it is in pipe rather than tube.
by Momus
Sun Feb 14, 2021 12:33 pm
Forum: Project bikes
Topic: LOBE 2 20-21
Replies: 260
Views: 55379

Re: LOBE 2 20-21

Stainless is an interesting choice of material Yes :!: I have not seen a bike made in Stainless ever, --- before I made my own one! but Stainless is tricky, -- if you do not keep on to the rules it needs, -- the disaster is shurely given :???: DSCN2277.jpeg brainwork : where to go with the tubes to...
by Momus
Fri Feb 12, 2021 12:48 am
Forum: Tech
Topic: B50 hydraulic drum brake
Replies: 58
Views: 13758

Re: B50 hydraulic drum brake

The actual force that is applied to the system will be governed to a great extent by the grip of the tyre.
by Momus
Mon Feb 08, 2021 5:53 am
Forum: Project bikes
Topic: B25 SS CV19 project
Replies: 74
Views: 20410

Re: B25 SS CV19 project

Further to the fitting of a hydraulic operated front brake. For an MOT exemption I have to declare that the Motorcycle is fundamentally unaltered. (or words to this effect) How might this change of brake operation be viewed by DVLC ? Would a failure to declare invalidate the insurance ? Anyone have...
by Momus
Mon Feb 08, 2021 5:51 am
Forum: Tech
Topic: Maximum bore of a 441
Replies: 11
Views: 4441

Re: Maximum bore of a 441

Ian Hingley wrote: Sun Feb 07, 2021 10:46 pm
kommando wrote: Sun Feb 07, 2021 2:51 pm You cannot push the old liner out on a B44 barrel, the original liner was corrugated on the OD and cast into the barrel.
Correct kommando! :thumb Think I mentioned that in my original comment.

Cheers

Ian
Whatever.

Bore it out.
by Momus
Sat Feb 06, 2021 12:42 pm
Forum: Tech
Topic: Maximum bore of a 441
Replies: 11
Views: 4441

Re: Maximum bore of a 441

Hi All I am really striking out on the search feature so I am giving in and asking anyone with the experience of over boring a 441 I have a 441 core heading to my shop for work - The owner really just wants to bore it as large as possible and this is an opportunity for me to make a custom piston fo...
by Momus
Thu Feb 04, 2021 8:44 pm
Forum: Tech
Topic: Wear Tappet
Replies: 5
Views: 2893

Re: Wear Tappet

The angle also affects the valve timing and rate of lift/valve opening.
by Momus
Wed Feb 03, 2021 1:18 am
Forum: Project bikes
Topic: 1972 B50 SS Return to Flight .
Replies: 101
Views: 19512

Re: 1972 B50 SS Return to Flight .

B50ForumUser wrote: Tue Feb 02, 2021 4:17 pm I would normally default to mineral (white) spirits for general washing out of oil coated parts ... is kerosene better?

Who knows?
Who cares?

Kero is cheap and available, hangs around, doesn't explode and was the basis for solvent cleaning systems for years..
by Momus
Tue Feb 02, 2021 2:45 pm
Forum: Project bikes
Topic: 1972 B50 SS Return to Flight .
Replies: 101
Views: 19512

Re: 1972 B50 SS Return to Flight .

Petrol? :laugh

Kerosene is the go.
by Momus
Wed Jan 27, 2021 5:38 am
Forum: Project bikes
Topic: B25 trials project.
Replies: 92
Views: 24838

Re: B25 trials project.

What is the plan with the kick starter shaft seal Frank?
by Momus
Fri Jan 22, 2021 1:55 pm
Forum: Tech
Topic: Piston ring gap
Replies: 6
Views: 2764

Re: Piston ring gap

Three thousandths per inch of bore diameter is a rule of thumb.

Someone who worries about air cooled engines might say 004".
by Momus
Mon Jan 18, 2021 8:12 pm
Forum: Tech
Topic: kickstart cotter pin
Replies: 9
Views: 3663

Re: kickstart cotter pin

A grade 8 bolt or a cap screw is a good start for a home made cotter.

The kicker spindles appear case hardened so much harder than any commercial fastener.
by Momus
Fri Jan 15, 2021 7:19 am
Forum: Tech
Topic: B25 Negative crankshaft end float
Replies: 9
Views: 3406

Re: B25 Negative crankshaft end float

Rebuild implies the crank and cases were previously together and satisfactory.

If the bearings are correct and proven and it's still tight I would machine, lathe with carbide tool, what is required from the outer ring of the timing side bearing.
by Momus
Thu Jan 14, 2021 5:51 pm
Forum: P92 Tech
Topic: Not sure If this is relevant P55?
Replies: 12
Views: 9851

Re: Not sure If this is relevant P55?

Here's another picture from Angus' video showing the left side of the cylinder head: P55left.JPG It looks identical to the photo from Classic Bike(July 90) that was in Gerry's original post. The spark plug appears to be located centrally in the cylinder head confirming the four valve layout. More p...
by Momus
Wed Jan 13, 2021 7:49 pm
Forum: P92 Tech
Topic: Not sure If this is relevant P55?
Replies: 12
Views: 9851

Re: Not sure If this is relevant P55?

Claus's photo shows 2 cam top end that to me is reminiscent of the Lotus Twin Cam.

If indeed it is probably a fair thing to copy back then being capable of around 100 hp per litre.

A lot easier to execute than the 4 valve Cosworths that had made their appearance by then.