Search found 1770 matches

by kommando
Thu Apr 09, 2020 6:56 am
Forum: Tech
Topic: Converting a B50 to wet sump.
Replies: 29
Views: 376
Flag: Ireland

Re: Converting a B50 to wet sump.

Compared to a shell bearing the clearance is much larger, only cold oil will register much pressure. If there was back pressure then the wider B25 gears would need to be fitted, but they are not.
by kommando
Wed Apr 08, 2020 11:38 am
Forum: Tech
Topic: Converting a B50 to wet sump.
Replies: 29
Views: 376
Flag: Ireland

Re: Converting a B50 to wet sump.

Not sure what you mean by the crank is a pump. When the crank is spinning fast it will act like a centrifugal pump, the oil being thrown out to the big end will draw oil up through the system. Still not sure about the thought there. The BSA oil pump feeds oil to the big end via a drilling in the ma...
by kommando
Tue Apr 07, 2020 4:31 pm
Forum: Tech
Topic: Converting a B50 to wet sump.
Replies: 29
Views: 376
Flag: Ireland

Re: Converting a B50 to wet sump.

A true wet sump has one pump pulling directly from the sump and into the crank hopefully via a filter, in my IMHO all the suggestions so far are for a dry sump where the sump is extended in depth. Still using the twin oil pumps with the feedside drawing from an oil tank and a return side drawing fro...
by kommando
Mon Apr 06, 2020 1:32 pm
Forum: Tech
Topic: Firing Up tr5 For First Time In Years
Replies: 16
Views: 443
Flag: Ireland

Re: Firing Up tr5 For First Time In Years

The B50 is closer to a Velocette than a Goldstar, this is due to the light flywheel and low gearing from kickstarter to crank. That makes it very difficult to put energy into the flywheel, so you need not just to just get it over TDC but go a bit further before giving the big kick, not so far that y...
by kommando
Mon Apr 06, 2020 12:12 pm
Forum: Project bikes
Topic: Starfire 441
Replies: 79
Views: 10277
Flag: Ireland

Re: Starfire 441

The missing photos are on Google who do not support forums very well if at all, there are alternatives like Postimage.org and there are others including this site, but do not use Photobucket or your photos will be held to ransom demands.
by kommando
Sat Apr 04, 2020 10:18 am
Forum: Tech
Topic: Better OIF Damper rod piston ring
Replies: 16
Views: 514
Flag: Ireland

Re: Better OIF Damper rod piston ring

No I ordered 3 for 2 pistons as I expect to break one testing for fit, total bill was £3.66 for all 3. From the listing Pack Qty 1 washer Unfortunately, Ebay does not allow single items to be listed at less than 99p. So the prices can look expensive when you purchase a few. Therefore we are happy to...
by kommando
Fri Apr 03, 2020 6:23 pm
Forum: Tech
Topic: Another question about speedometers
Replies: 16
Views: 374
Flag: Ireland

Re: Another question about speedometers

Nylon absorbs hydrocarbons and expands as it does so, best kept dry or use a dry lubricant like graphite.
by kommando
Fri Apr 03, 2020 9:57 am
Forum: Tech
Topic: Better OIF Damper rod piston ring
Replies: 16
Views: 514
Flag: Ireland

Re: Better OIF Damper rod piston ring

Buying some PTFE washers from https://www.ebay.co.uk/itm/Bespoke-Custom-PTFE-Teflon-Washers-1-5mm-thick-various-sizes-available-to-80mm/302592678775?ssPageName=STRK%3AMEBIDX%3AIT&var=601431743100&_trksid=p2057872.m2749.l2649 These are to fit some Koni 76 series dampers where the iron sealing rings h...
by kommando
Fri Apr 03, 2020 9:52 am
Forum: Tech
Topic: B50 Fork stanchion length??
Replies: 13
Views: 2321
Flag: Ireland

Re: B50 Fork stanchion length??

You don't need longer springs, just fit a spacer the length of the extra length over the B50 ones.
by kommando
Tue Mar 31, 2020 12:17 pm
Forum: Tech
Topic: Firing Up tr5 For First Time In Years
Replies: 16
Views: 443
Flag: Ireland

Re: Firing Up tr5 For First Time In Years

An alternative to the Teenager (nasty asymptomatic virus carriers ;) ) just remove the spark plug and then kick as much as you like.
by kommando
Mon Mar 30, 2020 9:35 am
Forum: Tech
Topic: Better OIF Damper rod piston ring
Replies: 16
Views: 514
Flag: Ireland

Re: Better OIF Damper rod piston ring

I presume less damping required for rebound and you may only need one upside down so you can save 25% and just have 3...?
You need more rebound damping than compression damping. Compression damping is working with the spring, rebound has to work against the spring hence the different requirements.
by kommando
Sat Mar 28, 2020 6:02 pm
Forum: Tech
Topic: B44 Speedo
Replies: 11
Views: 271
Flag: Ireland

Re: B44 Speedo

No, well it may be better calibration wise but they only fitted 2:1 and 1.25:1 on Unit Singles. Your speedo expects 1600 revs per mile, so work out the circumference of the wheel and divide that into 1 mile and then see what the multiplier is to get it to 1600. 18" wheels are around 800 revs to the ...
by kommando
Fri Mar 27, 2020 10:12 am
Forum: Tech
Topic: Better OIF Damper rod piston ring
Replies: 16
Views: 514
Flag: Ireland

Re: Better OIF Damper rod piston ring

No you need the seal even using the emulator or the oil by passes the emulator around the outside. The emulator only fixes 1/2 the problem as they only provide compression damping and no rebound damping. You can get round this by turning one of the emulators upside down but then you get issues with ...
by kommando
Thu Mar 26, 2020 3:09 pm
Forum: Tech
Topic: Fixed my Exhaust leak at the head
Replies: 9
Views: 405
Flag: Ireland

Re: Fixed my Exhaust leak at the head

Silicone lasts a year or 2 at least with me, I use it with the heat fin on the pipe butted up to the head.
by kommando
Mon Mar 23, 2020 1:12 pm
Forum: Tech
Topic: b44 gearbox leak/level
Replies: 15
Views: 421
Flag: Ireland

Re: b44 gearbox leak/level

Do you park it on the side stand ?

That will lean the oil to the mainshaft too ;)

The gearbox sprocket can leak along the splines, mounting it with some silicone goo on the splines sorts that one out.
by kommando
Mon Mar 23, 2020 12:05 pm
Forum: Tech
Topic: Best ignition with lighting
Replies: 7
Views: 333
Flag: Ireland

Re: Best ignition with lighting

Plenty of good reports on the ignition only electrex, it is just a PVL copy after all.

The combo with in built alternator is different, their own design and not a copy of someone else's work, which maybe why it does not work.
by kommando
Sun Mar 22, 2020 12:33 pm
Forum: Parts & Bikes wanted
Topic: b44 swing arm needle roller conversion
Replies: 7
Views: 1464
Flag: Ireland

Re: b44 swing arm needle roller conversion

Reading this from my Britbike post You have to ream out the swinging arm to 1.25" for 1.25" depth, this allows the B1616 to be slid into each end with a gentle interference fit, you are only removing 7 thou. The extra 0.25" is to give room for 2 washers one 1.25" OD and one 1" OD and both are bored ...
by kommando
Sun Mar 22, 2020 12:23 pm
Forum: Parts & Bikes wanted
Topic: b44 swing arm needle roller conversion
Replies: 7
Views: 1464
Flag: Ireland

Re: b44 swing arm needle roller conversion

I did this 12 years ago, a lot has happened so I will need to do some serious memory tricks, the seals were only O rings.
by kommando
Sat Mar 21, 2020 9:04 pm
Forum: Tech
Topic: Best ignition with lighting
Replies: 7
Views: 333
Flag: Ireland

Re: Best ignition with lighting

The electrex is the only crank mounted ignition and alternator combo I know of, as you can see from the review I linked too it's badly designed and not fit for purpose. So fix the Lucas alternator, the rotor can be remagnetised by Villers Services at £15, fit a capacitor and keep the wassell. The ca...
by kommando
Sat Mar 21, 2020 12:11 pm
Forum: Tech
Topic: Best ignition with lighting
Replies: 7
Views: 333
Flag: Ireland

Re: Best ignition with lighting

The Wassell ignition is good, why not just fit a capacitor and keep the Wassell ignition. Electrex support seems hit and miss.

https://granttiller.com/2020/02/13/elec ... -opinions/
by kommando
Fri Mar 20, 2020 2:57 pm
Forum: Tech
Topic: B25 crank dimension
Replies: 6
Views: 357
Flag: Ireland

Re: B25 crank dimension

I measured a B44,B50 and B25 cranks and I got .471 to .470. There is a leeway for the seals but I would go for the .475 if fitting a sleeve.
by kommando
Fri Mar 20, 2020 10:05 am
Forum: Tech
Topic: B25 crank dimension
Replies: 6
Views: 357
Flag: Ireland

Re: B25 crank dimension

The oil spigot on the timing side

I will measure one later but from another forum

I have two cranks on my bench.
One is 0.475'' the other is 0.4755''.
by kommando
Thu Mar 19, 2020 1:32 pm
Forum: Tech
Topic: B25 Oil circulation mod, why wouldn't this work?
Replies: 8
Views: 349
Flag: Ireland

Re: B25 Oil circulation mod, why wouldn't this work?

If you go the big bore B25 route then you need to now about the big end shells, OEM are Whitemetal eg Babbit and should never have been specified for a 100hp per litre engine.

viewtopic.php?f=3&t=4158&p=33252&hilit= ... ing#p33252
by kommando
Wed Mar 18, 2020 10:29 pm
Forum: Tech
Topic: B25 Oil circulation mod, why wouldn't this work?
Replies: 8
Views: 349
Flag: Ireland

Re: B25 Oil circulation mod, why wouldn't this work?

Try a variation on this, fresh oil to the top end. http://www.b50.org/phpBB2/viewtopic.php?f=65&t=2948&sid=eb12709d7b990ecb2d8f5867e6bec223 You also need to watch the pump, B25 is high capacity to feed a shell bearing, B44/B50 is lower capacity as roller bearing is free flowing so no back pressure t...
by kommando
Wed Mar 18, 2020 10:21 pm
Forum: Tech
Topic: B25 to B50 conversion?
Replies: 8
Views: 363
Flag: Ireland

Re: B25 to B50 conversion?

I myself would not bother with the extra bearing, I would (and do on B44's) make both main bearings extra capacity roller bearings.

viewtopic.php?f=60&t=3591
by kommando
Wed Mar 18, 2020 8:29 am
Forum: Tech
Topic: B25 to B50 conversion?
Replies: 8
Views: 363
Flag: Ireland

Re: B25 to B50 conversion?

Only the 71 onwards B25 cases can be used as they allow the barrel studs to be moved outwards to the B50 positions, earlier cases can only be converted to B44 cases. CCM GB can do the conversation as their cnc machine has it progammed.
by kommando
Mon Mar 16, 2020 11:10 am
Forum: Project bikes
Topic: My 1971 B25 VT
Replies: 24
Views: 1052
Flag: Ireland

Re: My 1971 B25 VT

Here is what I did to a set of A65 OIF forks which are virtually the same as B25/T25/B50 forks. Photo's are in photobucket but viewable in chrome with the photobucket fix extension installed and enabled. http://www.britbike.com/forums/ubbthreads.php/topics/643652/details-of-new-damper-internals-for-...
by kommando
Sun Mar 15, 2020 5:17 pm
Forum: Project bikes
Topic: Electric Start - Broken Knees
Replies: 28
Views: 1059
Flag: Ireland

Re: Electric Start - Broken Knees

I got the number wrong, too many 1's DOH

https://www.ebay.co.uk/itm/54212284-Tri ... SwO6hdnYBT
by kommando
Sun Mar 15, 2020 3:31 pm
Forum: Project bikes
Topic: Electric Start - Broken Knees
Replies: 28
Views: 1059
Flag: Ireland

Re: Electric Start - Broken Knees

Still waiting for the Aliexpress sprag clutch but here is a GL1100 sprag clutch and a KLF 300 starter mocked up on a timing side case. The sprag on its way is smaller so easier to fit in.

Image
by kommando
Sat Mar 14, 2020 9:42 pm
Forum: Project bikes
Topic: Electric Start - Broken Knees
Replies: 28
Views: 1059
Flag: Ireland

Re: Electric Start - Broken Knees

Looks like extended alternator mount studs with a bearing inside the lump of aluminium outrigger on the studs. Interesting that the same Mitsuba starter is used and it can turn over a twin with no exhaust valve lifter.
by kommando
Sat Mar 14, 2020 6:45 pm
Forum: Project bikes
Topic: Electric Start - Broken Knees
Replies: 28
Views: 1059
Flag: Ireland

Re: Electric Start - Broken Knees

Some pics of an A65 starter solution just to add some ideas, this one is mounted outside the alternator so must have a fancy sleeve nut with extension. Suspect there is a belt drive in there too. https://i.postimg.cc/wxVWVy7r/DSC01629.jpg https://i.postimg.cc/J01p8mdK/DSC01628.jpg https://i.postimg....
by kommando
Thu Mar 12, 2020 3:34 pm
Forum: Project bikes
Topic: B44 on the cheap!
Replies: 34
Views: 2769
Flag: Ireland

Re: B44 on the cheap!

You can only do this sort of cheap build in the US, once the USPS stopped doing sea freight to the UK it made it too pricey to pick up cranks and cases on ebay. Prices of the parts are still cheap but the air freight and Ebay's policy of adding extra shipping costs makes it too costly. Kudos for you...
by kommando
Tue Mar 10, 2020 7:09 pm
Forum: Tech
Topic: B40 Clutch Pressure Plate
Replies: 9
Views: 376
Flag: Ireland

Re: B40 Clutch Pressure Plate

Springs dragging in cups as they are out of line ?

Are the springs all the same ?
by kommando
Mon Mar 09, 2020 9:51 pm
Forum: Parts & Bikes wanted
Topic: B 50 Wanted
Replies: 9
Views: 449
Flag: Ireland

Re: B 50 Wanted

I get it a lot too, login, compose a reply to a post and after clicking submit the login page reappears and the post is gone.
by kommando
Mon Mar 09, 2020 10:58 am
Forum: Tech
Topic: Maybe Off Topic
Replies: 3
Views: 310
Flag: Ireland

Re: Maybe Off Topic

You had best describe what you have done so far backed up by photos, otherwise reader's crystal balls are all fogged. Yokes need to have the top sleeve nut undone completely and removed, next the 2 bolts holding the stanchions undone and best pulled out completely. Stanchions are best removed comple...
by kommando
Sat Mar 07, 2020 2:20 pm
Forum: Project bikes
Topic: B25 trials project.
Replies: 19
Views: 783
Flag: Ireland

Re: B25 trials project.

The B25 Chassis with the TR25W engine has some good features, its got the Triumph shuttle valve forks, 7" TLS front brake, steel petrol tank. Would make a good road bike. More likely a 69 rather than a 70 with the fibreglass cover to the steel oil tank which was dropped for 70 and the filler neck sh...
by kommando
Fri Mar 06, 2020 8:33 am
Forum: This Forum
Topic: TR5mx
Replies: 2
Views: 556
Flag: Ireland

Re: TR5mx

No, but it's still a BSA whatever the badge says, or is it a Triumph as the C15 was a larger Triumph Tiger Cub.
by kommando
Wed Mar 04, 2020 9:28 am
Forum: Tech
Topic: Odd clutch bearing arrangement.
Replies: 9
Views: 463
Flag: Ireland

Re: Odd clutch bearing arrangement.

There is a book somewhere called Dumb Previous Owner, 2 chapters devoted to B25's ;) .
by kommando
Tue Mar 03, 2020 7:32 pm
Forum: Project bikes
Topic: Starfire 441
Replies: 79
Views: 10277
Flag: Ireland

Re: Starfire 441

Yes. So removed my post.
by kommando
Tue Mar 03, 2020 1:32 pm
Forum: Project bikes
Topic: Starfire 441
Replies: 79
Views: 10277
Flag: Ireland

Re: Starfire 441

Deleted some rubbish.