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Messages - ANDY HIGHAM

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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.

Singles / Stargazer
« on: 08 September, 2017, 20:46:48 »
Stargazer sees the light of day at last
20170908_145323 by Sigma Projects, on Flickr
20170908_145256 by Sigma Projects, on Flickr

Singles / Re: Front brake
« on: 21 August, 2017, 20:47:42 »
It's an alloy drum

Singles / Re: B31 help
« on: 28 July, 2017, 20:59:50 »
If the bore is gone past the maximum rebore size you can use a Triumph T140 piston, it is 76mm and gives a capacity of around 400cc

Singles / Re: Internal Incontinece
« on: 27 July, 2017, 21:38:11 »
Gear pumps are great at producing pressure not so good at sucking. A spring loaded valve between the tank and pump could starve the engine of oil, an on/off tap is easily forgotten with disasterous results. BSA fitted an anti wet sumping valve, if it's not working find out why and repair it rather than a risky botch job

Singles / Re: B33 Gearbox casing clutch Arm grease nipple
« on: 22 July, 2017, 21:11:10 »
The grease nipple is largely useless, plenty oil works its way up the shaft and a dribble usually escapes out of the top

Singles / Re: C15 Charging system
« on: 24 June, 2017, 17:25:59 »
The charging circuit on these bikes is a bit sus. Two of the alternator windings charge the battery, the other four are switched in when the lights are on, there is no regulation. The ammeter is about as much use as a carpet fitters ladder.
The best thing you can do is fit the reg/rec from a jap bike (most will do but not oil cooled Suzukis, Yamaha xs1100 and a few others) disconnect the AC wires from the original rectifier and connect to two of the three yellow wires on the reg/rec. red from reg/rec to + black to -. Ideally disconnect the two ac wires that go to the light switch and join them together

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