Search found 1647 matches

by kommando
Wed Aug 07, 2019 11:15 am
Forum: Tech
Topic: B44 to 82mm
Replies: 9
Views: 686
Flag: Ireland

Re: B44 to 82mm

The std B44 liner is not pressed in but cast into the alloy, so if you want to re-liner it you first have to get the original liner bored out. By the time you have done that its best to get it Nikasil'd straight on to the barrel or onto an alloy liner.
by kommando
Sat Jul 27, 2019 4:49 pm
Forum: Tech
Topic: B44VS 1970 Solo Seat?
Replies: 3
Views: 225
Flag: Ireland

Re: B44VS 1970 Solo Seat?

Suggest you ring them but as long as its for the C15 competition frame then it was used for the B25/B44 up to and including 1970. If its for the swan neck C15 then the shape could be different.
by kommando
Sat Jul 27, 2019 11:37 am
Forum: Tech
Topic: B40 and B44 motor in OIF chassis
Replies: 7
Views: 774
Flag: Ireland

Re: B40 and B44 motor in OIF chassis

B44 and B50 are long stroke and taller than the other short stroke motors including B40.
by kommando
Mon Jul 08, 2019 9:58 pm
Forum: Tech
Topic: RR's Tappet Clearance?
Replies: 3
Views: 342
Flag: Ireland

Re: RR's Tappet Clearance?

More like 2 and 1.
by kommando
Sat Jul 06, 2019 6:25 pm
Forum: Tech
Topic: Push rod shimming
Replies: 7
Views: 752
Flag: Ireland

Re: Push rod shimming

B44 GP 11.4 comp, B44 round barrel 9.4 comp, B44 square barrel 9.4 comp.
by kommando
Sat Jul 06, 2019 6:17 pm
Forum: Tech
Topic: Grease retainers - hubs
Replies: 3
Views: 220
Flag: Ireland

Re: Grease retainers - hubs

Go ahead, see no issues.
by kommando
Tue Jul 02, 2019 12:18 pm
Forum: Tech
Topic: Conical rear hub offset.
Replies: 18
Views: 829
Flag: Ireland

Re: Conical rear hub offset.

You already have the spokes ? Just use the spokes and make up the wheel without setting an offset but using the length of the supplied spokes to position the rim and get the rim trued. Then mount on the bike, line up the sprockets and then move the rim to line up with the front rim by loosening the ...
by kommando
Mon Jun 24, 2019 10:22 am
Forum: Tech
Topic: Tooth found in gauze when changing oil
Replies: 6
Views: 697
Flag: Ireland

Re: Tooth found in gauze when changing oil

Sign up to postimage.com or similar, upload pic to the site and then post the provided link within your post using the insert photo button which adds the correct indentifiers to your photo link.



Image
by kommando
Sun Jun 23, 2019 12:00 pm
Forum: Tech
Topic: B40 and B44 motor in OIF chassis
Replies: 7
Views: 774
Flag: Ireland

Re: B40 and B44 motor in OIF chassis

The B40 gearbox sprocket will need looking at if its pre the circlip retaining the gearbox main bearing and the sprocket datum point moved by 40 thou. Both B40 and B44 will need work on the oil manifold as it will foul on the frame tube under the engine, or relocate the frame tube. Exhausts and sile...
by kommando
Tue Jun 18, 2019 5:28 pm
Forum: Tech
Topic: 8inch front brake
Replies: 16
Views: 1735
Flag: Ireland

Re: 8inch front brake

Have you adjusted the micram adjusters, they move the shoes until they are just about to touch the drum prior to the lever being pulled.

Are the cams fitted to the correct sides of the brakeplate, try swapping them over.
by kommando
Tue Jun 04, 2019 2:34 pm
Forum: Tech
Topic: Bsa b40g engine tuning
Replies: 19
Views: 1857
Flag: Ireland

Re: Bsa b40g engine tuning

My Bad, 7/16th BSF in B40G pre 69 cases as they do not have raised number stamp pad, 69 B44 cases 7/16th UNC.
by kommando
Mon Jun 03, 2019 8:03 pm
Forum: Tech
Topic: B25/B44 wiring
Replies: 14
Views: 4400
Flag: Ireland

Re: B25/B44 wiring

Not sure how, I know my Wassell rectifier/regulator leaks to earth and discharges the battery on my Commando with the ignition off but that's because it's crap and I have a replacement not because the wiring is defective.

Image
by kommando
Mon Jun 03, 2019 10:42 am
Forum: Tech
Topic: Bsa b40g engine tuning
Replies: 19
Views: 1857
Flag: Ireland

Re: Bsa b40g engine tuning

Assuming you are talking about the case end of the stud.

Neither, 7/16 Whit, B44 started as 7/16 Whit and then went to 7/16 UNC which has the same TPI, so just a change of thread angle.

But check first in case a DPO has messed about.
by kommando
Thu May 30, 2019 10:12 am
Forum: Tech
Topic: B44 Alternator Repair
Replies: 7
Views: 818
Flag: Ireland

Re: B44 Alternator Repair

It goes in the bucket and you buy a replacement. I can't find the book but from memory Rupert Ratio's fix is not for a rotor that's disintegrating but for a rotor loose on the soft B25 crank mainshaft. Its soft as the big end is a shell bearing and the crank is not hardened, the built up cranks have...
by kommando
Wed May 29, 2019 4:19 pm
Forum: Tech
Topic: b25ss timing cover bung plug/past shortage of B50 kickstart quadrants
Replies: 17
Views: 1347
Flag: Ireland

Re: past shortage of B50 kickstart quadrants

Could we have only one version of this post not 2 ?

Edit by MM: Your wish is my kommando
by kommando
Wed May 29, 2019 4:17 pm
Forum: Tech
Topic: b25ss timing cover bung plug/past shortage of B50 kickstart quadrants
Replies: 17
Views: 1347
Flag: Ireland

Re: b25ss timing cover bung plug

You know the B40 one fits but is worn, so send the B50 one back and ask for it to be replaced by a B40 one (which should be the same as the B44 one and middle run of production of B25, the early B25 may have a thinner kickstart shaft, the early B40 one did). The key way was not on genuine BSA kickst...
by kommando
Wed May 29, 2019 8:05 am
Forum: Tech
Topic: b25ss timing cover bung plug/past shortage of B50 kickstart quadrants
Replies: 17
Views: 1347
Flag: Ireland

Re: b25ss timing cover bung plug

Steve's mentioned it first ;) , it is the oil level plug but not sure it's set at the normal level as going by the factory literature the gearbox capacity was larger for the WDB40G. Maybe they distrusted the squadrons checking the level often enough and so increased the oil level to be safe.
by kommando
Tue May 28, 2019 5:24 pm
Forum: Tech
Topic: b25ss timing cover bung plug/past shortage of B50 kickstart quadrants
Replies: 17
Views: 1347
Flag: Ireland

Re: b25ss timing cover bung plug

WDB40G standard fitment but just not as large a nut, note these WD engines were being still made into 71 so who knows if its a Previous owners mod or some WDB40G outer timing cover was fitted when the std ones ran out on the line.
by kommando
Wed May 22, 2019 5:43 am
Forum: Tech
Topic: c15c - B44 type frame
Replies: 19
Views: 1705
Flag: Ireland

Re: c15c - B44 type frame

My question from here is how similar is the works frame to a production frame and am i able to make a convincing works frame clone out of a production frame. The works was OIF yes but it was a C15 comp frame as the changes were very small to make it OIF, it used the top tube but had a small header ...
by kommando
Mon May 20, 2019 2:44 pm
Forum: Tech
Topic: c15c - B44 type frame
Replies: 19
Views: 1705
Flag: Ireland

Re: c15c - B44 type frame

I have heard mention that the C15C frame was based on a works frame so i will look for reference to the works bike to see how similar it really is. You need to find out about 'Black Bess', works bike for Jeff Smith, started as a 350, went to 420, then 441. It used the works frame which became the C...
by kommando
Tue May 14, 2019 10:51 am
Forum: Tech
Topic: Bsa b40g engine tuning
Replies: 19
Views: 1857
Flag: Ireland

Re: Bsa b40g engine tuning

Do not grind down the follower foot, the early ones are weak and BSA made them thicker to compensate, do not go back the way. Shorten the cam follower tunnel to the B44 size instead and check its enough before finishing the cut. 1- get a set of double diameter studs made up to suit? 2- sleeve the ba...
by kommando
Thu May 02, 2019 1:30 pm
Forum: Tech
Topic: Truckle slide
Replies: 20
Views: 2383
Flag: Ireland

Re: Truckle slide

It looks like a tiny "mouse hole" in the bottom of the port side of the slide. Where does the radius of the carb throat come into it? Thanks. First attempt was the mousehole but dropped instead for hole with radius of carb throat. On my 250 and 441 I do not get this small opening issue, wonder what...
by kommando
Tue Apr 30, 2019 10:21 am
Forum: Tech
Topic: B50 doesn't like tickling
Replies: 6
Views: 859
Flag: Ireland

Re: B50 doesn't like tickling

The correct tuning for a pilot jet is to get the bike fully warm and then tune the pilot air mixture screw for highest revs, then lower the revs and redo the tuning just in case lowering the slide alters the mixture. That should result in the mixture being too lean on a cold engine and hence the nee...
by kommando
Mon Apr 29, 2019 5:38 pm
Forum: Tech
Topic: Kick-start aid
Replies: 8
Views: 1003
Flag: Ireland

Re: Kick-start aid

You can sort out the 850 MK3 starter. 1. Thicker cables 2. Heavy duty solenoid 3. 4 pole conversion to starter 4. High CCA battery If you have EI which over advances when the voltage drops then add a voltage buck in series, 5A capacity should do it, and this will retain 12V at the Boyer until the ba...
by kommando
Fri Apr 26, 2019 6:25 pm
Forum: Tech
Topic: Head Gasket Fitting - tips and tricks.
Replies: 6
Views: 837
Flag: Ireland

Re: Head Gasket Fitting - tips and tricks.

The B44 correct head gasket is the same thickness as the B40, the pattern B44 is made too thin but if its the correct thickness it also fits the B40. The pattern one is also too thin for the B44.
by kommando
Tue Apr 23, 2019 4:55 pm
Forum: Tech
Topic: 1000-Series 2/4-stroke Concentrics
Replies: 85
Views: 5745
Flag: Ireland

Re: 1000-Series 2/4-stroke Concentrics

Its ok through the full range as long as there is no load on the engine, so that negates a lot of the info it gives from mid throttle upwards as you need a load 1/2 throttle onwards. So its perfect for idle, gives you good info on the transition from idle to throttle cutaway and then starts to give ...
by kommando
Wed Apr 17, 2019 12:23 pm
Forum: Tech
Topic: In search of reliable B25 oil pressure.
Replies: 74
Views: 11837
Flag: Ireland

Re: In search of reliable B25 oil pressure.

Too much money compared to a refresh of a pump.
by kommando
Wed Apr 17, 2019 12:02 pm
Forum: Tech
Topic: In search of reliable B25 oil pressure.
Replies: 74
Views: 11837
Flag: Ireland

Re: In search of reliable B25 oil pressure.

On Norton pumps the shaft leak is fixed by fitting O rings to the body where the shafts run. Should be easy enough to replicate on a Unit Single pump.

Here is a Norton one I did but substituted X rings.

Image

You need a vertical mill to do it properly.
by kommando
Wed Apr 17, 2019 8:46 am
Forum: Tech
Topic: In search of reliable B25 oil pressure.
Replies: 74
Views: 11837
Flag: Ireland

Re: In search of reliable B25 oil pressure.

Your pump is leaking from the feedside to the scavenge side through the shafts and both non return valves are not working.
by kommando
Wed Apr 17, 2019 8:44 am
Forum: Tech
Topic: Bsa b40g engine tuning
Replies: 19
Views: 1857
Flag: Ireland

Re: Bsa b40g engine tuning

I do understand that taking material from the bottom does weaken the base and the barrel is thinnest in the middle etc.
The bottom is the strongest and the amount you will be taking off will not weaken it at all.
by kommando
Tue Apr 16, 2019 6:05 pm
Forum: Tech
Topic: Bsa b40g engine tuning
Replies: 19
Views: 1857
Flag: Ireland

Re: Bsa b40g engine tuning

Its a B40G Jeff, so its B25/B44 crankcases slightly modified for the low lift cam, no distributor and other than wide ratio gearset the gearbox is already B25/B44. Not many in US but a lot in Europe as the Military used them. They were being built until 71 at least with all the changes except for th...
by kommando
Tue Apr 16, 2019 11:10 am
Forum: Tech
Topic: Bsa b40g engine tuning
Replies: 19
Views: 1857
Flag: Ireland

Re: Bsa b40g engine tuning

1. 20mm longer stroke means 10mm higher and then adjusted for any changes in piston height, B44 is 9.4:1 but B40 9:1 is available and the extra .4 can be adjusted in. 2. MX cam in a short stroke high revving engine may not be the right way to go, MX will give better low down grunt but not much up to...
by kommando
Sun Apr 14, 2019 12:50 pm
Forum: Tech
Topic: In search of reliable B25 oil pressure.
Replies: 74
Views: 11837
Flag: Ireland

Re: In search of reliable B25 oil pressure.

What is the oil level in the frame, if its too high and has reached the return pipe outlet then it will siphon the excess oil out. Or someone has added a longer tube to G to stop the returning oil from short circuiting to the oil outlet and its too long and is below the oil level. http://b50.org/rno...
by kommando
Sat Apr 13, 2019 3:31 pm
Forum: Tech
Topic: In search of reliable B25 oil pressure.
Replies: 74
Views: 11837
Flag: Ireland

Re: In search of reliable B25 oil pressure.

The scavenge non return in the sump drain only holds back the oil in the pipe, nothing more and just keeps the pump scavenge gears full of oil, the feedside non return in the inner timing cover stops the oil tank contents from draining into the engine when it not running.
by kommando
Sat Apr 13, 2019 10:16 am
Forum: Tech
Topic: In search of reliable B25 oil pressure.
Replies: 74
Views: 11837
Flag: Ireland

Re: In search of reliable B25 oil pressure.

New ball and spring are mandatory every time you maintain that non return valve, the ball gets a set for the seat and the seat distorts and spring loses tension. Even with a new ball, tapping it onto the seat and new spring will not fully work but at least slows it down. The relief valve is after th...
by kommando
Fri Apr 12, 2019 9:59 am
Forum: Parts & Bikes wanted
Topic: Bsa b44 round barrel and head
Replies: 1
Views: 593
Flag: Ireland

Re: Bsa b44 round barrel and head

A B40 90SS head with the 4 barrel stud holes opened up to suit the B44 studs is the same as a B44 round barrel head and is how I got mine sorted.
by kommando
Fri Apr 12, 2019 9:10 am
Forum: Project bikes
Topic: B25ss Goldstar.
Replies: 5
Views: 837
Flag: Ireland

Re: B25ss Goldstar.

Not an expert at all, just looking for ways to cope with our potholed roads and came across digressive damping which both promised and delivers if tuned correctly. I have CBR600RR Showa cartridges with shim stacks in my Commando so knew it worked but then found if you fitted them to OIF then you end...
by kommando
Thu Apr 11, 2019 4:49 pm
Forum: Project bikes
Topic: B25ss Goldstar.
Replies: 5
Views: 837
Flag: Ireland

Re: B25ss Goldstar.

Lathejack if you need any info on my BMW SS1000R insert re-engineer KK has added the link to then ask here or PM me. For someone with a lathe and mill its not hard to do especially based on what pics you have posted, beats my turning attempts. As the cartridge inserts are upgraded as soon as the bik...
by kommando
Thu Apr 11, 2019 4:10 pm
Forum: Tech
Topic: Bsa b40g engine tuning
Replies: 19
Views: 1857
Flag: Ireland

Re: Bsa b40g engine tuning

The B40G has a low lift camshaft short duration cam as fitted to the C15 B40 standard models with sometimes the B40 valve head but later some seem to have got the B40 90SS larger valve head. The carb is also restrictive and it has a low compression piston. You have a few options to pick from or you ...
by kommando
Tue Apr 09, 2019 8:45 pm
Forum: Tech
Topic: 1000-Series 2/4-stroke Concentrics
Replies: 85
Views: 5745
Flag: Ireland

Re: 1000-Series 2/4-stroke Concentrics

But all 850's have the slotted spray tube, so the 260 was on a slotted spray tube carb but comparing to 230 or 200 tells you nothing as they had slotted too. Unless you test 850 carbs with unslotted spray tubes to find the best main jet and the change to slotted and see if any change is needed only ...