Search found 4199 matches

by Mark Cook
Wed Apr 19, 2017 12:49 pm
Forum: Tech
Topic: Swing Arm Oil Seal
Replies: 17
Views: 1923
Flag: England

Re: Swing Arm Oil Seal

Don't even think of using the lip seals, our CCM system out performs all other ideas. No need for grease nipples either. You'll get many years out of the bearings providing you use hardened bushes too.
by Mark Cook
Sun Apr 16, 2017 1:40 pm
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 68965
Flag: England

Re: Electric Start

Closer :cool:
Beat2.jpg
by Mark Cook
Thu Apr 13, 2017 8:39 am
Forum: News
Topic: Happy birthday Richard
Replies: 12
Views: 1304
Flag: England

Re: Happy birthday Richard

Have a good one Rickard. <208
by Mark Cook
Wed Apr 12, 2017 11:06 am
Forum: Project bikes
Topic: B50 MX for Bonneville
Replies: 420
Views: 33534
Flag: England

Re: B50 MX for Bonneville

Where's that head Andy, one change at a time remember
by Mark Cook
Sat Apr 08, 2017 8:52 am
Forum: Tech
Topic: b44 braided oil/fuel lines ?
Replies: 2
Views: 595
Flag: England

Re: b44 braided oil/fuel lines ?

It's got to the stage where we have to make the fittings and Furrell's too Gerry. We only have a limited range to solve our problems.
by Mark Cook
Fri Apr 07, 2017 1:30 pm
Forum: Tech
Topic: difference between B40 WD / B25 gearbox parts
Replies: 12
Views: 1602
Flag: England

Re: difference between B40 WD / B25 gearbox parts

Just a note for those that have forgotten, we make a low first and second gear set. Handy for long distance trials work. I'm sure a few of you will have some.
by Mark Cook
Fri Apr 07, 2017 1:24 pm
Forum: Tech
Topic: Cannot stop it pinking.
Replies: 17
Views: 1814
Flag: England

Re: Cannot stop it pinking.

With Ed's work on the head the idea was to improve the filling of the chamber. Sounds like it works too. Now you have too much volume to compress and it's self-igniting. Large throttle openings at low rpm often make this work. Nothing is wrong other than your effective compression ratio is too high....
by Mark Cook
Tue Apr 04, 2017 8:52 am
Forum: Tech
Topic: Foam in oil
Replies: 11
Views: 1344
Flag: England

Re: Foam in oil

Foam in the Beer upsets me !
by Mark Cook
Sat Apr 01, 2017 8:52 pm
Forum: Tech
Topic: Cylinder head nuts B44
Replies: 10
Views: 1267
Flag: England

Re: Cylinder head nuts B44

Sly, it's easier with a smaller hex
by Mark Cook
Fri Mar 31, 2017 1:22 pm
Forum: Off topic
Topic: Crankshaft experiment
Replies: 148
Views: 14536
Flag: England

Re: Crankshaft experiment

What material are you using for the valve seats Jack?
by Mark Cook
Tue Mar 21, 2017 9:39 am
Forum: Project bikes
Topic: B50 MX for Bonneville
Replies: 420
Views: 33534
Flag: England

Re: B50 MX for Bonneville

37 years of experience obviously counts for nothing, best send the airline ticket Andy. I don't have a clue.
by Mark Cook
Fri Mar 17, 2017 9:52 pm
Forum: Tech
Topic: Oil Leak from Gearbox
Replies: 37
Views: 3684
Flag: England

Re: Oil Leak from Gearbox

We use a double sealed bearing, it will find as much oil as it needs with the seals in place. After fitting the sprocket, before the tab washer apply a high modulus silicon sealant around the sleeve gear and onto the sprocket face. This may or may not ease your problem depending on it's origin.
by Mark Cook
Fri Mar 17, 2017 6:07 pm
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 68965
Flag: England

Re: Electric Start

Op.4
Beat1.jpg
by Mark Cook
Wed Mar 15, 2017 3:13 pm
Forum: News
Topic: Happy Birthday Stan
Replies: 7
Views: 866
Flag: England

Re: Happy Birthday Stan

Have a good one and many more Stan <219 <208
by Mark Cook
Tue Mar 14, 2017 9:50 am
Forum: Tech
Topic: valve timing agsin
Replies: 25
Views: 2436
Flag: England

Re: valve timing agsin

My simulation is better than your simulation and I even have bigger books, and one day I might even leave my bedroom :!:

Seriously, it's staring to sound this way.

Experiments in the real world backed up with hard data collected from first hand experience, I do hope they make you laugh Stan.
by Mark Cook
Sun Mar 12, 2017 11:10 pm
Forum: Project bikes
Topic: B50 MX for Bonneville
Replies: 420
Views: 33534
Flag: England

Re: B50 MX for Bonneville

Enjoy hospital Andy, I'm sure your not their first. I like to use a 3/8 drive rattle gun as it makes me less dangerous. :mrgreen:
by Mark Cook
Sun Mar 12, 2017 11:06 pm
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 68965
Flag: England

Re: Electric Start

It's not about the money Beat, though costs need to be covered. I like to make things for those that deserve it, sadly the toys needed are very expensive.
by Mark Cook
Sun Mar 12, 2017 8:14 pm
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 68965
Flag: England

Re: Electric Start

Op1.
SprocketV2.jpg
by Mark Cook
Sun Mar 12, 2017 8:03 pm
Forum: Project bikes
Topic: B50 MX for Bonneville
Replies: 420
Views: 33534
Flag: England

Re: B50 MX for Bonneville

You have a job to tell it was A-salt-ed <216

Hope your going to fit that missing sprocket bolt Andy :?:
by Mark Cook
Sun Mar 12, 2017 5:52 pm
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 68965
Flag: England

Re: Electric Start

About to start cutting steel Beat. Gear diameter 128.0mm Pitch diameter 124.0mm Base diameter 116.522mm Root diameter 119.372mm
Fingers and Toes crossed ;-)
by Mark Cook
Wed Mar 08, 2017 4:10 pm
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 68965
Flag: England

Re: Electric Start

Thanks Cranky, it's so easy to fall into traps. The first was an edit on a B50 crank sprocket. This one will be an edit on the last one, so the sprocket detail should be correct. BTW we machine from the inside, out. This keeps all the diameters concentric.
by Mark Cook
Wed Mar 08, 2017 1:11 pm
Forum: News
Topic: Teppo
Replies: 0
Views: 572
Flag: England

Teppo

Happy Birthday Teppo, what a shame you never managed to make it to the European championships. Have a good one.
by Mark Cook
Wed Mar 08, 2017 1:06 pm
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 68965
Flag: England

Re: Electric Start

What am I watching out for Cranky?

Shame your casting drawings don't have draft angles, you could have saved me some work ;)
by Mark Cook
Wed Mar 08, 2017 12:55 pm
Forum: Project bikes
Topic: Hwan's BSA 250 Scrambler
Replies: 108
Views: 11975
Flag: England

Re: Hwan's BSA 250 Scrambler

Hope you checked if the crank is in the middle Nigel????
by Mark Cook
Wed Mar 08, 2017 12:47 pm
Forum: Tech
Topic: Who made frames for B50s?
Replies: 13
Views: 1760
Flag: England

Re: Who made frames for B50s?

Not often advertised, but if I was looking at a Metisse style frame I'd seek out Wasp Motorcycles.

Oh btw Michael, just loved the two stroke barrel work you were involved with casting. Your "space suit" was a sight to behold :)
by Mark Cook
Sun Mar 05, 2017 11:08 am
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 68965
Flag: England

Re: Electric Start

I'd be happier with 5mm Beat if you can manage it.
by Mark Cook
Sat Mar 04, 2017 12:53 pm
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 68965
Flag: England

Re: Electric Start

The inner boss face for the 6 spline that mounts against the LJ7/8 is more like 11.5mm from the sprocket face Cranky, but I've found they can be around 0.2mm either side of that in the real world.
by Mark Cook
Sat Mar 04, 2017 10:15 am
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 68965
Flag: England

Re: Electric Start

Good job I haven't made that one yet then Beat, though it would be easy for me to do it next week as Anita will be cutting internal splines for crank sprockets. Yes you are correct Beat that the root of a tooth form need some support to stop it twisting out. Also the teeth will drop into a recess if...
by Mark Cook
Sat Mar 04, 2017 10:00 am
Forum: Suppliers and New Products
Topic: Vapour blasting
Replies: 7
Views: 972
Flag: England

Re: Vapour blasting

Richard, you won't believe how the most simple jobs can go wrong. Also remember we don't deal in ones. We're hoping we can save a very expensive job at the moment that some locals messed up. It's so much nicer if you can keep subcontractors close. (oops that's where it went wrong :oops: ) I'll look ...
by Mark Cook
Wed Mar 01, 2017 9:49 am
Forum: Suppliers and New Products
Topic: Vapour blasting
Replies: 7
Views: 972
Flag: England

Re: Vapour blasting

I wish I had someone a stones throw from us, it seems there are a few people doing wet blasting in that area.
by Mark Cook
Tue Feb 28, 2017 10:10 am
Forum: Int BSA Rally and other meetings
Topic: Classic dirtbike show,
Replies: 29
Views: 2766
Flag: England

Re: Classic dirtbike show,

We been making all the 78 CCM parts for years, tried tested and they fit the original bikes. They don't sell in quantities to make it worth while doing. The last couple of years we've had a made rush on 78 parts, two or three items a year. We only do it to keep the history alive. Another thing to re...
by Mark Cook
Tue Feb 28, 2017 9:55 am
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 68965
Flag: England

Re: Electric Start

Theoretical Gear centre distances are often just that Beat. If you have existing gears you want to use it's doubtfully they will comply to any rule. They would have been made to fit. So you'll have to work out your own centre distances. This is why I pointed you at "Gearotic" Beat, it looks like it'...
by Mark Cook
Sat Feb 25, 2017 7:24 pm
Forum: Int BSA Rally and other meetings
Topic: Classic dirtbike show,
Replies: 29
Views: 2766
Flag: England

Re: Classic dirtbike show,

Doesn't Rickard have a thing for resizing them?
by Mark Cook
Fri Feb 24, 2017 11:28 pm
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 68965
Flag: England

Re: Electric Start

We are about to slot some crankshaft sprockets in a week or so Beat, so yours could jump in with them if you decided to go that way. It will be cheaper than last time as there is no special tooling to buy. Personally some plastic gears as space models would be nice if they came cheap enough. Ask aro...
by Mark Cook
Fri Feb 24, 2017 9:37 am
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 68965
Flag: England

Re: Electric Start

So much does is to print something like this? I guess it's a rep rap type machine that does it?
by Mark Cook
Thu Feb 23, 2017 11:38 am
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 68965
Flag: England

Re: Electric Start

Yes we have the material at 130mm dia.
by Mark Cook
Thu Feb 23, 2017 10:15 am
Forum: Tech
Topic: B44 Con Rod
Replies: 7
Views: 1002
Flag: England

Re: B44 Con Rod

Even if not changing a rod I always split the crank to clean it.
by Mark Cook
Thu Feb 23, 2017 10:08 am
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 68965
Flag: England

Re: Electric Start

You don't make it easy Beat, best look in the stores for a bit 130mm bar. Thanks Cranky for the translation.

Now are you sure this is what you really want Beat :?:
by Mark Cook
Thu Feb 23, 2017 10:02 am
Forum: Tech
Topic: B44 Con Rod
Replies: 7
Views: 1002
Flag: England

Re: B44 Con Rod

A B44 rod is 1mm narrower than a B50 one. The best way to protect a rod is to make sure the engine is mechanically sound. Excess big or small end and piston to bore clearance will make any rod suffer. Yes, if you have access to crack testing equipment all the better. BTW any aftermarket rod will ups...
by Mark Cook
Mon Feb 20, 2017 10:52 pm
Forum: Off topic
Topic: Hybrid
Replies: 211
Views: 19202
Flag: England

Re: Hybrid

A lot of work and looking good, will be good to read about your experience with the rear brake. Some manufacturers have swapped back and forth with tied or floating so I guess it's a case of suck it and see. Just take it steady to start with.