Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Messages - ANDY HIGHAM

Pages: [1] 2 3
Singles / Re: C15T crankcase breather oil leak - but only some times!
« on: 18 November, 2017, 21:34:11 »

I had a wet sumping problem on my A50. I put in any anti wet sumping valve. 35 ish and a fairly easy job.  No more wet sumping.

I was against the idea to start with, but when I mentioned it here, several guys gave me positive results so I went for it.

It easy to see that it is working by watching the return pipe in the tank.

Worth a thought???

The A50 and A65 have an anti wet sumping valve from the factory. It is the ball and spring behind the oil pump. The valves that fit between the tank and the engine could cause oil starvation, pumps do not like to suck


Singles / Re: C15 rear wheel dissassembly
« on: 11 November, 2017, 22:29:05 »
BSA didn't think about that. One way is to hold the brake on and use a deep socket and rattle gun

Singles / Re: Newby B40 help
« on: 06 November, 2017, 15:46:36 »
Before you start stripping it down, put it in gear, pull the clutch in and press the kick starter. It should turn the rear wheel, if not the problem is with the kickstart mechanism, if it does then the problem is the primary drive.
Remove the plug, put it in gear and turn the rear wheel, if the engine does not turn over the problem is the primary drive

« on: 28 October, 2017, 22:44:38 »
Sorry I cannot agree with you, thick treacle like oil is not a substitute for good surfaces and gaskets.
There is a common misconception that thicker oil has better lubricating properties. Bullshit, thinner oil reaches the bearings faster. Film strength and shear resistance are more important, additives such as zinc improve wear resistance on high pressure areas like cam followers.

« on: 28 October, 2017, 14:46:29 »
Castrol XL is still available. I have 20 litres in my shed. Have a look at Morris lubricants website. They have oils for every possible use. My rule of thumb is straight 40 for roller big ends, 20-50 for plain big ends. Many people use multigrade for everything with no problems. It's a big subject with many strong opinions. Essentially, if you use a reputable oil and change it regularly you won't have any problems.
Why? Straight 40 has no advantages over 20/50. In really cold weather it may not even flow through the oilways properly.
"R" type oil does have an advantage in roller bearing engines as the molecule chains are more resistance to the shear stresses imposed on the oil by rolling bearings.
I am a firm believer in the abilities of scientists and technicians to develop better oils than the oils of 50 years ago. I use fully synthetic 20/50 in my B31

Singles / Re: Exhaust sealing
« on: 22 October, 2017, 17:47:43 »
I use clear silicone

Singles / Re: B31 Magneto oil seal
« on: 22 October, 2017, 13:00:58 »
You may need shims to ensure correct mesh between idler gear and magneto gears

Singles / Re: B31 Magneto oil seal
« on: 19 October, 2017, 21:31:55 »
As the breather system is designed to keep crankcase pressure below atmospheric pressure, that would suggest the seal should be fitted spring out. I fitted mine spring in

Singles / Re: B44, Bigend, Piston. Bad vibration.
« on: 17 October, 2017, 18:16:12 »
Not quite. The piston assembly and the top part of the rod is reciprocating mass, the lower part of the rod is rotating mass. Also, is 58% correct or just what was thought to be correct 50 years ago?

Singles / Re: B44, Bigend, Piston. Bad vibration.
« on: 13 October, 2017, 16:27:11 »
There is no reason why a B44 should vibrate badly.
Don't assume BSA correctly balanced the crank, they probably balanced the prototype then made all the production ones "similar"
My B31 (400cc) crank/rod/piston assembly was balanced by Phil Pearson and the bike is smooth as silk all the way to 80 + MPH

Singles / Re: B31 Manual Advance/retard
« on: 12 October, 2017, 14:47:49 »
How often do cables snap?
Most cable failures are either fraying through rust or incorrectly soldered nipples pulling off

I make my own cables using PTFE lined outer conduits. The inner wires are splayed before soldering and are soldered in a solder pot (about 15 off Ebay)
Most parts available here

Singles / Re: Stargazer
« on: 23 September, 2017, 13:09:12 »
Last weekend I took her to the British records meeting at Elvington. I thought it would be a good place to run it in and set the carburettor. I managed a best standing start mile speed of 84MPH

Singles / Re: B25 starting problem
« on: 18 September, 2017, 11:40:55 »
My bet is a blocked pilot jet

Singles / Re: BB32A
« on: 18 September, 2017, 11:39:35 »
As far as I know there is no such thing as a CB34 frame. All BSA frame designations were the smallest bike using that frame. B33s had a B31 frame No, A10s has an A7 frame No and B34s had a B32 frame No

Singles / Re: Advice wanted on choice of BSA model.
« on: 08 September, 2017, 20:51:38 »
If you chose a pre-unit single Phil Pearson does an electric start kit. If you chose a pre unit twin Steve McFarland does an electric start kit.

Pages: [1] 2 3