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Messages - EDDIE SIMPSON

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31
Twins / Re: A65 valve springs
« on: 15 November, 2023, 17:47:16 »
i recently bought some hepolite valve springs. they did fit the cups but the coils diameter is thicker. the problem with that is there is a chance of coil bound at high speed. a clearance check is in order when assembled.

32
Twins / Re: A65 valve springs
« on: 14 November, 2023, 18:18:01 »
i have a set of replacement valve springs [hepolite ]  and the wire diameter is thicker. increasing the  bottom cup diameter would make sense as less chance of coil bound at high speed and spring breakage.

33
Twins / Re: A65 valve springs
« on: 13 November, 2023, 17:10:35 »
hi dave,
i believe the bottom cups are the same as oif b50  or b25 but the people to ask are autocycle in dudley? who bought old bsa stock.

34
Twins / Re: 1951 A10 Plunger ignition timing
« on: 13 November, 2023, 17:06:39 »
manual magnetos are much more rewarding when set up properly.
firstly see whether pulling the retard lever or pushing the lever advances the ignition. so leave the lever in fully advanced position then time the ignition as normal.
i retard to start then go to fully advanced until engine warms up [ a few miles ] then retard as per engine feel / feedback.

35
Twins / Re: a65 same old problems
« on: 31 October, 2023, 21:02:29 »
if you take off the srm end cover and with a vernier compare the rod from the cover with the depth of the hole you would know if the pushrod length is correct. careful set up with shorter standard springs cured my lack of clutch lift but a poor clutch cable also eats into the lift action as the outer cable compresses.

36
Twins / Re: A65 Alloy barrels
« on: 31 October, 2023, 20:53:24 »
i didnt know john hill passed away. he was friendly and very knowledgeable. i have a set of his barrels here for my spare engine which must have been his last batch.

37
Twins / Re: a65 same old problems
« on: 29 October, 2023, 14:24:40 »
hello alan and dave,
i wouldnt mind making my own cables but unsure what solder to use. i have some plumbers solder and flux somewhere.

38
Twins / Re: a65 same old problems
« on: 28 October, 2023, 22:09:42 »
thanks for all the advise.
managed to clear most of the clutch drag by adjusting the springs. i had used the wrong springs before also. the a65 ones are shorter than pre unit types. lastly my clutch cable which looks original but in poor condition takes a lot of outer cable compression before clutch lift. a shame to bin it.

39
Twins / Re: inlet valve seals
« on: 26 October, 2023, 23:55:08 »
hi dave,
k liners sound very exotic but i dont think you can beat a set of iron guides and new valves for diy maintenance and economy.
personally i believe a multigrade oil will burn oil no matter what as its a thin oil with additives i am led to believe.
dont srm recommend straight oils now?

40
Twins / Re: inlet valve seals
« on: 26 October, 2023, 12:11:52 »
i think oil seals on valve guides are worth fitting if the engine burns a lot of oil like tridents do. but the bsa twins dont seem to suffer as much at the speeds i travel at anyway.

41
Twins / Re: a65 same old problems
« on: 22 October, 2023, 15:54:44 »
hi allan,
its no oil painting.
dave is right about the clutch mech as its a 72 engine in a 65 frame from the usa.

42
Twins / a65 same old problems
« on: 20 October, 2023, 20:14:24 »
i have avoided another a65 for 30 years but here i am again with a thunderbolt with the same old problems.
firstly, the new gearlever i bought only contacts about half the width of spline area due to the centre bolt locating on the non spline section of the gear shaft. surely a wider gearlever would help avoid the wear and tear issue with both splines ?
also the clutch. you think you have set it up correctly but go round the block and the clutch is dragging.
i have the clutch cover off. its standard 4 spring but there is hardly any lift. i am going to have to play around with the plates and maybe leave one out.

43
Twins / Re: A65 non start
« on: 20 October, 2023, 19:18:39 »
electronic ignition is good but the pick up rotor gap has to be spot on to fire correctly or at all. if the correct gap is 0.03mm for example, then i also set the plug gaps to that clearance.
unless the pilot jet is blocked it should fire up.
another thing to look out for is a slipping clutch. you may be turning the engine over too slowly to fire even though your kicking madly.

44
Twins / Re: New carbs advice please.
« on: 18 October, 2023, 13:50:32 »
you can still use a 2 x 389 monobloc carbs. monoblocs are a better carb i think.

45
Twins / Re: Swing arm bronze bush
« on: 03 October, 2023, 21:32:54 »
i have grippy bridgestones on my a10 and found roadsurfaces on motorways caused a lack of backend stability.
bridgestone tyres, needle rollers and grease for me.
also bought those ikon imitation shocks from a bsa dealer and now i am very happy with my bsa handling.
a bush kit from unity would work just as well i think as long as the grease is pumped inside.

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