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Messages - john.k

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286
British Bikes / Re: Simplex Villiers in Australia, 1936
« on: May 29, 2019, 10:44:55 AM »
The pic is interesting too......Milledge Bros,Cottman &Co,Turner Bros...............Ive never heard of Cottman &Co......the other two are well known enough.........What is the car in front of milledge?......strange sloped grille,maybe a Citroen?...the Ford sedan is ex army ,they all had balloon 9x13 tyres,

287
British Bikes / Re: Simplex Villiers in Australia, 1936
« on: May 29, 2019, 02:43:26 AM »
Simplex was a common name for many machinery suppliers...such as Baltic -Simplex...............said to be originally a trade mark of Benz &co,who gave it up around 1905,as too many makers were using the name....such as Ariel Simplex......Secondly,...rare bikes from Holland......seems quite a large industry there "finding" unbelievably rare bikes in excellent condition......and selling them for megabucks........a gentleman with a large handlebar moustache comes to mind.

288
British Bikes / Re: Burman gearbox AP
« on: May 28, 2019, 03:01:09 AM »
On the size of the casing,I dont see 4 speeds fitting inside......more like a 3 speed...........They made a lot of different boxes ........one time I had a big Burman 3 speed F&R,from a shunting locomotive,engine was a Ruston 4 VPH,which is a pretty big engine...........incidentally,the last manager of Burman is still living in Birmingham,and is trustee of the Burman Trust.......but I dont think they give out money to sick and ailing gearboxes............the family were quite prominent in the University of Birmingham.

289
British Bikes / Re: Burman gearbox AP
« on: May 27, 2019, 01:34:53 PM »
I have never seen or heard of one.....but .logically ,it is the first of the "new" series Burmans from 1930 onwards,the missing "A" from the B,and C lineup......incidentally the P means pivoted mount ,a patent of Walter Moore,while he was at Norton......BSA first infringed the patent,deeming it "fraudulent",then losing that argument,worked around it ,the first BSA having a Moore pivot was the SA  A7/10 of 1954,long after the patent expired.

290
British Bikes / Re: Coventry Eagle
« on: May 27, 2019, 01:29:26 PM »
Villiers seem to have invented the flywheel magneto around 1920........think of how many have been made in the century since ..........even now the solid state ignition on little engines is still a flywheel magneto,just has no mechanical parts...I have an antique pump with a Mk 10 /100cc 4 stroke on it,the spark was so weak it couldnt be seen in daylight,yet the little motor starts and runs reliably,and has been used industrially in the years since.Bit smoky tho.

291
British Bikes / Re: BSA Gold Star misfiring
« on: May 18, 2019, 06:52:18 PM »
Assume you have checked that you have no supressed/high impedance ignition components?......also will assume you are aware they double magneto voltage and cause failure even in rebuilt mags?......but symptoms sound a bit like a faulty spark plug.

292
British Bikes / Re: Spronging forks question
« on: May 13, 2019, 09:57:00 AM »
Join the Owners Club.......very likely they are remanufacturing hard to find items,and certainly will know where to find stuff.Im pretty sure they have a forum,where you could ask ,even if not a member of the club........which you should be.

293
British Bikes / Re: JAP 750 v twin ,type MTS
« on: May 12, 2019, 12:35:22 PM »
The owner is a millenial.......and if he says "cool" one more time ,he will be walking funny,with Jap parts inserted.

294
British Bikes / Re: Spronging forks question
« on: May 12, 2019, 12:32:15 PM »
I would think that by 55,there should be the girling units ,but with the alloy forked cast lower end.........I assume the ally emds are threaded onto the girling  shocks..............You cant fit standard girlings ,as the mounts are different........The red oil will be Dexron autrans fluid........which is what I use........I find that Matchless forks have stanchions of vry soft steel,and easily bendable.................with the advantage ,easily straightenable,without worry about cracking heat treated  high carbon steel,like BSA s......seals are no problem......but wear in the alloy sliders is.......if worn excessively,they will need to be replaced........seen prices for new of around 200 quid each......kinds steep.

295
British Bikes / Re: JAP 750 v twin ,type MTS
« on: May 11, 2019, 02:38:37 AM »
Ive looked at all the options ,main problem is the case is  not very strong..........same as the rest of it.......Anyhoo,Im thinking the cheapest option is to make a new outer race,and skim the case bore just enough to round it up........fortunately the 22mm mainshaft is good......looks like it was replaced....................the rebuild with INA bearings is probably the best,but  too costly........The main bearing is somewhat similar to a WLA part,similar dimensions ,and I could use WLA cages ,but the JAP alloy cage is still good........................I suggested to the owner to rebuild the whole motor with new WLA parts,including flywheels,rods, shafts ,bearings..........but cost is an issue ..... and its only a sidevalve................the conrods are also problematic,but the owner wants the JAP system retained..........in fact the outer forked rod is completely wrong since day one,and machining out the centre rod space has made part of it paper thin ,and its cracked.......every non racing JAP ive ever worked on had serious issues with poor quality and bad design.

296
British Bikes / Re: Coventry Eagle
« on: May 10, 2019, 04:34:06 AM »
Its a pretty little bike,which is not often said about CE s.............the racing primary means you will never need to trim your toenails.

297
British Bikes / JAP 750 v twin ,type MTS
« on: May 10, 2019, 04:30:54 AM »
I have a JAP 750 to rebuild,and I m wondering about the drive side  mainbearing........the shaft is OK,but the outer race is chewed,and been turning in the case..............My old fallback of using INA races and rollers has hit a snag....SKF.......seems Skf have taken over INA,and prices are now astronomical,as in 2.FN.DR!...........inner race +caged roller +outer race..(need to be trimmed) is over $200.............but big advantage is it all fits in the case.......which case IMHO is a bit weak to be enlarging bearing bores.........However ,a 62/22 ball is 50mm od,needs about 4 mm enlargement,say 2mm  cut from the housing.(original bore is oval ,and needs skimming anyway,at 46-47mm........but a 62/22 is 22mmID,fits the shaft ,and costs around $20 depending on brand............one other option considered is tapered rollers with 22mm bore /44 mm OD,but obviously needs two opposed bearings ......not impossible,.....but.

298
British Bikes / Re: Excelsior Universal 125cc - Rear Plunger
« on: May 07, 2019, 08:16:42 AM »
OK,so what does the inside surface of the tube look like..............it should be a plain cylinder ,probably with the natural finish of a solid drawn tube ..............the rods should have a thread or a boss in approx the centre ,for a spring seat to go on ........from here it looks like the rods are replaced with plain ,and springs outside...........I must say its a strange bodge,but british bikes are the natural habitat of the strange bodger,and sadly,the true bodger is becoming extinct due very high prices for new material to bodge.

299
Identify these bikes! / Re: Barr and Stroud mystery bike
« on: May 07, 2019, 02:24:36 AM »
About the same time as the Arblaster patent ,Ricardo &Co patented and licensed a simplification of the Barr and Stroud system ,do ing away with skew gears altogether and using a link driven by a single eccentric and lever,achieved the same rotary motion of the sleeve and applicable to inline multicylinder engines ........engines were built by Peter Brotherhood &Co ,and by Mirrlees ,Bickerton  and Day..............The Mirrlees engines were quite common once .as they were a WD contract item genset .....and built in hundreds.................incidentally ,the Day mentioned was Charles Day,who invented the crankcase compression two stroke .

300
Identify these bikes! / Re: Barr and Stroud mystery bike
« on: May 07, 2019, 02:13:30 AM »
Any US patent is searchable by the inventors name .......you usually need a full name ,but something uncommon shouldnt be hard to find.......if indeed it was actually  patented,and not applied for and rejected. .................you will notice G.Brough stooped to the device of applying for patents that he had no hope of getting issued,and then advertized "Patent pending",or "Patent applied for" .

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