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Messages - chaterlea25

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316
The Classic Biker Bar / Re: 6hp JAP ignition
« on: April 10, 2014, 11:53:07 PM »
Hi Tony,
I will have to disagree a bit with Leon's diagnosis  :o
I believe the setup shown is for trembler coil ignition
With trembler coils the spark occurs when the contacts close, then the trembler does its thing
(similar to a buzzing doorbell coil) this provides a series of sparks while the contact is closed

I recently set up such a device on a veteran De Dion engine
On another veteran engine I made a new cam to operate conventional contact points
Set the timing at TDC or a 32second after at full retard on the lever

HTH
John

317
British Bikes / Re: J.A.P. EXHAUST VALVE TIMING
« on: March 25, 2014, 06:55:17 PM »
Hi Tony, Leon,
Isn't the world full of coincidences?
Tony and I share the same surname and have machines with Chater Lea connections,
Only last week I visited Letchworth to do some CL research and went and saw the Factory buiding CL moved to in 1928, its still called Chater Lea House. The pre 28 building in London is still pretty much externlly as it was, It looks to be a block of flats now??
I'm hoping to have my 25CL finished for its 90th birthday in 2015

Regards
John

318
British Bikes / Re: J.A.P. EXHAUST VALVE TIMING
« on: March 23, 2014, 07:35:33 PM »
Hi Tony,
The rotating contact housing is the method used to alter the ignition timing
With the automatic inlet valve housing removed you should be able to access the tops of the pistons with a cranked piece of wire
It has survived a hundred+ years with out having holes drilled in it so I would advise against it
These engines are basic in the extreme, so do not need very precice valve timing, the nearest tooth on the gear wheel (ex valve closing) at TDC will work, you can always try it a tooth either way later on

On these early engines the ignition advance control is as important as the throttle control, learning to drive these is a whole new experience  :o :o

Regards
John

319
British Bikes / Re: Alpha villiers help!!!!
« on: February 27, 2014, 11:11:58 PM »

320
Identify these bikes! / Re: Prewar Matchless
« on: February 23, 2014, 11:36:12 PM »

321
Japanese Bikes / Re: Any one had problems with POR 15 Tank Sealer?.
« on: February 09, 2014, 02:58:26 PM »
HI All
I have used the method described in the attached article to de rust tanks, no drama!!!!

http://myweb.tiscali.co.uk/andyspatch/rust.htm

HTH
John

322
British Bikes / Re: seek help for 6t parts identification
« on: January 31, 2014, 07:36:54 PM »
Hi All,
I mentioned modding the rods in Dunboynes other thread
Something in the back of my head suggests Austin A30 shells  ::) ::)
A quick google , first hit is http://formhalls.com/6490.html

Second hit, contains this info:
"have spoken to Oliver Barns at Tri Sopply 01404 47001. he able to get the mechining done to covert the rods to shell bearings, or able to supply the shells, which come from the 350/500 C range of Triumphs, for those who possess their own machining facilities "

HTH
John

323
British Bikes / Re: seek help for 6t parts identification
« on: January 29, 2014, 07:13:13 PM »
Hi
For info and parts books this might help
http://www.thenmmshop.co.uk/bruce-main-smith

HTH
John

324
British Bikes / Re: tiger 100 engine questions
« on: January 28, 2014, 07:42:03 PM »
Hi Dunboyne,
Your engine has the early type rods, white metalled on the steel caps  :(
Refurbishing these is pretty difficult, one method that used to be used was to bore out the rod and cap to accept shells, these then need modifying as the boring will take away some of the rod bolts, then new bolts will be needed as well
Its probably easier to source later shell type rods
It is vital to split the crank / flywheel to clean it out .
The innards will be stuffed with a hard grey sludge from the centrifugal effect. These cranks do not have  removable sludge trap plugs like the later one piece cranks
New flywheel bolts/nuts will be needed for rebuild

Quote
i planned to leave well enough alone

When rebuilding old engines, this is not a good idea as inevitably the one piece you leave is the one that will give trouble at the earliest oppertunity ::) ::) ::) ::)

HTH
John

325
British Bikes / Re: 1957 model 88 basket case value?
« on: January 17, 2014, 09:19:57 PM »
Hi All,
I think it should be the other way round with plain rocker spindles for a pressure fed top end?
The scrollled spindles will allow too much oil to the head if fed under pressure
This floods the head with oil and much smoke ensues  :-[
I have had a lot of these problems when building a 99 from parts, it had a six start oil pump gear fitted
I dont know if the oilways were modified but doubt it
It also spews oil out the crankcase breather
I now have the original 3 start gears and am going to fit those when time  permits
I believe the final Commando set up was to divert the oil from the PRV back to the feed side of the pump ??
as this lessened the excess amount of oil thrashing around in the crankcase

Regards
John

326
Hi Again
The bushes should not be able to slide in and out of the housings
Have you accurately measured the crankcase bush bores?
In order to see if its the cases or bushes are the problem

Usually there are matching numbers on each half crankcase on one of the lugs
these were done at production to keep matching pairs together

With a name like Dunboyne I'm assuming you are Irish based?
I am as well !!
If you want to send me a pm I can give you my email address to send photos to
I may be able to help with the engineering issues

John


327
British Bikes / Re: triumph twenty one top end questions .
« on: November 14, 2013, 08:12:08 PM »
Hi,
The cam bushes should be an interference (shrink) fit in the cases
If the bush/s were rotating in the alloy they will have worn the alloy oval which will need trueing up and oversize bushes made to suit
Then the inner bores should be line reamed or bored to fit the cam itself,

$ £ & €'s all the way  :o

HTH
John

328
Hi Albert,
Send the details  of the piston  required to,  johnharding197@live.co.uk

or phone, Sheffield British Motorcycles ( Bantam John) Chesterfield 00 44 1246 29002

HTH
John

329
British Bikes / Re: Beesa ID
« on: October 02, 2013, 10:11:57 PM »
HI
BSA Bantam numbers info here
http://www.mistgreen.com/bantamref.htm

BSA Frame and engine numbers were not matching until sometime in the late 1960's

HTH
John


330
British Bikes / Re: BSA Bike Identify
« on: September 28, 2013, 05:46:37 PM »
HI
 Can you find the frame and engine numbers, this will help put a date on the bike
The wheels fitted are circa 1970

John

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