Welcome, Guest. Please login or register.

Recent Posts

Pages: [1] 2 3 ... 10
Technical Discussion Forum / Re: Axle threads
« Last post by AndyB on January 17, 2018, 08:17:54 PM »
Thanks - will use EN16.
Technical Discussion Forum / Re: Engine Breathing into Rocker Box
« Last post by VicYouel on January 16, 2018, 09:34:44 AM »
Hi Ian and glad to see you are out  riding. Oil is meant to go up the push rod tubes to provide an oil mist to valves and rocker shafts. However as John states when the piston/rings wear the crankcase pressure will increase and over oiling will be the result. In the Vincent world there have been many dialogues on crankcase pressure and breathers; one thing that did make sense to me is that with these flap valves  the crankcase pressure probably sits at 2 psi below atmosheric pressure in normal running conditions.  Model 9's for 1932 onwards provided a better rocker lubrication but 90's had further adjustable feeds.
Technical Discussion Forum / Re: Engine Breathing into Rocker Box
« Last post by singleminded on January 16, 2018, 08:43:25 AM »
On my bike the breather runs from the timing chest which is where the push rod tubs fit, so yes air will go up the pushrod tubes..You have to think about breathers though, they do most of their work when you are kicking the bike over. As the revs rise they become almost ineffective as the air is trying to flow and reverse so fast that almost no air movement occurs..till the rings wear out and you get too much crankcase pressure that can't be relieved and massive leaks result---dribble dribble, a bit like me..john
Technical Discussion Forum / Engine Breathing into Rocker Box
« Last post by Iansmart on January 15, 2018, 08:01:05 PM »
My Model 9 has no lubrication to the top-end, but there is considerable pressure in the rocker box! A rocker box bolt fell out on a 'brisk' run and when I stopped I noticed air blowing out the bolt-hole. I wonder how it got up there? i have the usual disk flap on the crank case which appears to be fine. I can't blow into it, but I can suck. Could it be going up the push rod tubes?
Beamers General Discussion Forum / Re: Tool kit spanners etc
« Last post by Thomas on January 13, 2018, 09:28:58 AM »
Hi fellows! I made a mag sprocket removal tool for about 2 quid by myself. Cheers, Thomas
Beamers General Discussion Forum / Re: Tool kit spanners etc
« Last post by johnguppy on January 11, 2018, 10:09:40 AM »
Morning Vic

thanks for your reply  I will order a mag puller but I no how busy less is  so I will leave it for a while and  try later
Yes I have read the parts book but only refers to one spanner size   and then says a number  2-3 4  spanner  unless it refers to  BSA spanners they are numbers   I wounder if this  makes sence  , are you going to Kempton   perhaps we can meet up for a coffee  ?
Beamers General Discussion Forum / Re: Tool kit spanners etc
« Last post by VicYouel on January 11, 2018, 09:12:27 AM »
In some parts lists the tool kit is illustrated and also listed in hand books..... you will have to read across the factory reference part and interpolate for your model.
As far as I know Sunbeam marked tools were available for their bicycles but not for motor bikes.

A mag sprocket removal tool is available from Les hobbs.
Beamers General Discussion Forum / Tool kit spanners etc
« Last post by johnguppy on January 10, 2018, 07:36:02 PM »
Happy new year to all

I am looking for information to build up a tool kit for my Model 7 ,looking at the parts book  a long list of tools spanners etc. but on information on sizes  , looking on ebay it seems only one spanner seems to be available  a 4 way combination spanner  would any one have any info   and I guess  unlike BSA  who made there own spanners sunbeam may have bought  in spanners  for there bikes 

Also looking for a Mag  sprocket  removal tool         
Technical Discussion Forum / Re: Axle threads
« Last post by phutton on January 09, 2018, 05:30:07 PM »
Silver steel is a definite NO for wheel spindles - it's much too brittle. Something like an EN16 is much more appropriate. I'm sure your machinist can advise.

« Last post by shorrog on January 09, 2018, 10:12:31 AM »
Folks the 2018 events diary is now available on the main website  via the "Events Page". http://www.marston-sunbeam.org/events.html.

There are just a couple of dates that are TBA but they will be added as soon as available.

Do take a look at the list, there are some great events and distributed around the country.

We look forward to seeing you.

Pages: [1] 2 3 ... 10