Good morning

Please find attached some pictures of the head and the valves etc

Thanks for all your help

Regards

Graeme

Thanks all

On the point from Nev about the valve cap - I don't think I have one on there which might explain why the tappet adjustment on the exhaust valve screws down a lot further than the intake! I shall go an investigate further and take some more photographs.
By trial and error I have managed ...

Afternoon all, having played around with setting the lifter against the rocker and tweaking the angle of the actuator arm I have managed to get the valve to open a fraction enough to decompress, this may be enough though I am concerned that the lifter cam is engaged on the rocker arm permanently ...

Thanks everyone for their input - I shall reassemble with some replacement washers etc and try and set it up. I will take a couple of photos of it off the bike, I did wonder if the lifter was worn and so causing it to be able to move too far around.

Regards

Graeme

Good evening all

I have a 1937 500cc OHV single Ariel and I ma struggling to get the exhaust valve lifter to operate correctly. When I set it up, the lifter cam that operates on the valve tappet seems to lift the tappet but then get stuck and not return to the 'closed' valve position.

I have ...

Hi All
Thanks for all the help so far, having removed the adjuster and measured it, the outside diameter across the thread is .297 inch (5/16 equates to 0.3125) and the head of the adjuster and locknut fits a 3/16 Whitworth spanner! The TPI is 26, so I assume it is a cycle thread. Have I got this ...

Thanks for everyone's replies, a bit of dismantling and further investigation is needed I think, nobody likes the idea of welding so I will cross that off the list. Thanks for the thread information.

I will let everyone know how it goes - my suspicions were aroused when I realised the back wheel ...

Good morning

I have a 1934 NH frame and the thread on one of the rear wheel position adjusters is stripped.
I haven't stripped this yet and so not measured the thread, does anyone know offhand what the thread and diameter is and has anyone tried to use a Heli coil in this part of the bike?
If not ...

Thanks for those replies - I am just refurbing my mudguards on a 1934 NH and wondered why there was a hole there!

Thank you Paul