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ruston & hornsbt pb6 timing

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Post by MICK 0196 Tue Nov 05 2019, 14:56

Hi, I am trying to do the timing on my ruston Hornsby pb6 1 1/2 to 2hp. I have another which has timing marks on the fly wheel as in a line and the word spark but this one has no marks on the fly wheel! has anyone any suggestions please for timing it up. many thanks.

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Post by Appletop Tue Nov 05 2019, 16:53

Take spark plug out, insert screwdriver in the hole, turn engine over in correct direction until the screwdriver is pushed out, at this point it is at TDC so mark flywheel with chalk or a marker pen, turn back 2 inches and set points to open at that point.
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Post by MICK 0196 Wed Nov 06 2019, 09:29

thanks for that Villiers, I will try that and let you know the result.

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Post by BBRAP Wed Nov 06 2019, 10:13

Check valves to make sure it is on the compression stroke and not exhaust stroke. You can normally feel the compression but worth making sure both valves are shut. Not trying to teach anyone to suck eggs but I do know of a certain person who did set the timing to the exhaust and then had trouble getting it to run.

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Post by Appletop Wed Nov 06 2019, 11:44

[quote="BBRAP"]Check valves to make sure it is on the compression stroke and not exhaust stroke. You can normally feel the compression but worth making sure both valves are shut. Not trying to teach anyone to suck eggs but I do know of a certain person who did set the timing to the exhaust and then had trouble getting it to run.[/quote]

Agree to a point but as the 6PB runs the mag at crankshaft speed it shouldn't make any difference as it has a wasted spark on the exhaust stroke.
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Post by BBRAP Wed Nov 06 2019, 12:05

Villiers wrote:
BBRAP wrote:Check valves to make sure it is on the compression stroke and not exhaust stroke. You can normally feel the compression but worth making sure both valves are shut. Not trying to teach anyone to suck eggs but I do know of a certain person who did set the timing to the exhaust and then had trouble getting it to run.

Agree to a point but as the 6PB runs the mag at crankshaft speed it shouldn't make any difference as it has a wasted spark on the exhaust stroke.

You live and learn. Good to know that Like a Star @ heaven

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Post by Appletop Wed Nov 06 2019, 12:51

Yup, quite a few of these old engines run the mag at crankshaft speed so have a wasted spark. It all depends on the engine.
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Post by Appletop Wed Nov 06 2019, 12:52

BTW, what part of Gods own Suffolk are you in BBRAP?
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Post by BBRAP Wed Nov 06 2019, 14:43

Hi Villiers,

Thurston near Bury St Edmunds,

P.S. One of my sons lives near you, Roydon nr Diss

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Post by Appletop Wed Nov 06 2019, 15:18

Thurston is a nice village, nice and handy to Bury. Yes Roydon isn't that far from me.
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Post by maryalice Wed Nov 06 2019, 18:21

Thurston, that brings back memories, my Father in Law came from there and and two of my wife's aunts lived there, I'm a Bury boy ish, my parents moved us up from South London when I was thirteen along with my brother and sister. We now live in Bedfordshire.

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