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Technical Discussion Forum / Re: Decompressor not functioning
« Last post by VicYouel on April 22, 2018, 03:41:18 PM »
Sounds to me as though you have done all the checks...... the lifter inside the timing chest simply butts under the "lip" or "ear"  of the cam follower.... it may have over ridden it.

No real choice except to go through the nausea of stripping out everything to see what has gone wrong!

Vic
2
Technical Discussion Forum / Decompressor not functioning
« Last post by Steve_M90 on April 22, 2018, 03:03:01 PM »
I cannot get the decompressor lever to operate the exhaust valve. I have moved the bike backwards and forwards in gear and the exhaust valve moves in sequence, suggesting the cams, pushrods and tappets etc are fine. However, when I pull on the decompressor lever on the handlebars there is no resistance at all. The cable is connected to the bell crank lever and the lever is attached to the spindle. I can see the spindle is turning.

I was riding the bike. I was pulling up at a junction and trying to change down to first. I stalled the engine and then couldn't restart it. (Fortunately this was a test ride very close to home).

It looks like a time-consuming task to get to this spindle as I will have to dismantle the oil pumps and magneto timing chain. I'd be grateful for suggestions of other checks or remedies before I start the strip-down. The bike is a 1932 Model 90 with a foot change gearbox.

Thanks

Steve

3
Technical Discussion Forum / Re: Amal carb washers
« Last post by Steve_M90 on April 22, 2018, 09:28:22 AM »
I'm pleased to report that it is easy to buy spares from Amal!! Thanks to Steve for the suggestion - I had assumed all original Sunbeam suppliers were long gone!! I rang their technical department to confirm the correct spare although it was easy to identify on their website. New washer fitted and problem resolved.

Steve
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EVENTS / Re: The Les Newman Memorial run 2018
« Last post by huwparsons on April 20, 2018, 10:23:05 AM »
White Horse at Woolstone fully booked now.
There are still rooms available for the night of 2nd June at the King and Queen at Longcot at £75 B&B

Let me know if you would like help with accommodation...

Brgds

Huw
5
Technical Discussion Forum / Re: Screw for the primary chain case
« Last post by Thomas on April 19, 2018, 07:57:40 PM »
Hi Paul, here is a pic of my screw. It is 20mm long, the head length is 4.5mm and its width is 7mm. Cheers, Thomas
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Technical Discussion Forum / Re: Screw for the primary chain case
« Last post by Thomas on April 19, 2018, 07:20:03 AM »
Good morning, that sounds great"
Tony, I sent you a PM with my email address.
Paul,  I'll check tonight and send the length then.
Cheers, Thomas
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Technical Discussion Forum / Re: Screw for the primary chain case
« Last post by phutton on April 18, 2018, 11:09:57 PM »
I have some stock of these. Let me know what length and I will send you one.

P.
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Technical Discussion Forum / Re: Screw for the primary chain case
« Last post by meddlesomebilly on April 18, 2018, 09:51:47 PM »
Hi Thomas,
In 2016 Paul Hutton made a comprehensive table of Sunbeam casing screws, if you let me have your e-mail address I'll forward a copy to you.
Tony.
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Technical Discussion Forum / Re: Screw for the primary chain case
« Last post by Thomas on April 18, 2018, 08:13:12 PM »
That would be great, Graham! These screws are quite difficult to get here in Germany and it would indeed help to know what it is.
Cheers, Thomas
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Technical Discussion Forum / Re: Screw for the primary chain case
« Last post by shorrog on April 18, 2018, 06:23:06 PM »
Hi Thomas
They are a standard imperial size but with a fillister head as standard.  I will check on my bike for the size.
Graham
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