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by paul.jameson
Wed Oct 21, 2020 9:27 pm
Forum: Four stroke
Topic: steering damper knob coming loose
Replies: 8
Views: 612

Re: steering damper knob coming loose

I replied to this post yesterday but for some reason my reply has apparently been lost. However, others have covered the point which I made. Turning to Pete Silson's post, the pin is not necessary to connect the lower yoke to the steering column. All 1957, possibly 1956, and later NH models were not...
by paul.jameson
Wed Oct 21, 2020 9:19 pm
Forum: Where is it now ?
Topic: 919 APU
Replies: 5
Views: 565

Re: 919 APU

Its a 1954 model NH of 350cc. What year the rider is, I can't be sure.
by paul.jameson
Wed Oct 21, 2020 9:15 pm
Forum: Ariel Talk
Topic: Clutch Lever still feels heavy.
Replies: 35
Views: 1762

Re: Clutch Lever still feels heavy.

The lever box contains only one ball ended lever, but it is 7/8" pivot to nipple centre. In an ideal world, you would use it on the brake side, but if you can put up with the pivot nut upwards, rather than the screw head, it is yours. Ideally, it needs re-chroming but if you want it I can send ...
by paul.jameson
Wed Oct 21, 2020 9:00 pm
Forum: Main Chat Forum
Topic: Identity
Replies: 2
Views: 388

Re: Identity

Was it a Stoke-on-Trent registration by any chance?
by paul.jameson
Wed Oct 21, 2020 8:54 pm
Forum: Main Chat Forum
Topic: Identity
Replies: 2
Views: 388

Re: Identity

The person putting the numbers in the log book had a bad day. The 7 at the beginning of the numbers should be a T. Whether the next character should be a 5 or an 8 is open to question - but the engine and frame numbers should be the same for a 2 - stroke.
by paul.jameson
Tue Oct 20, 2020 8:52 pm
Forum: Four stroke
Topic: Fitting new valves and guides
Replies: 26
Views: 1315

Re: Fitting new valves and guides

Clean out the guides as best you can using a small bottle brush or similar with petrol or thinners. Clean the valve stems with petrol or thinners using an old toothbrush or similar. Lubricate and assemble. Run the bike, very gently. The worst that can happen is that the valve seizes in the guide, in...
by paul.jameson
Mon Oct 19, 2020 8:17 pm
Forum: Four stroke
Topic: Which wheels
Replies: 5
Views: 370

Re: Which wheels

I would advise WM3 x 18 as well.
by paul.jameson
Mon Oct 19, 2020 8:15 pm
Forum: Four stroke
Topic: Cylinder firing order in a square four
Replies: 10
Views: 482

Re: Cylinder firing order in a square four

Chris is absolutely correct. On the magdyno Square Fours 1936-48 the distributor base is cast as part of the magdyno end plate and so is completely unable to rotate. The position of the rotor arm can be adjusted instead. On the Mk I and Mk II models 1949-59 you can rotate the distributor base to alm...
by paul.jameson
Fri Oct 16, 2020 8:34 pm
Forum: Four stroke
Topic: Which wheels
Replies: 5
Views: 370

Re: Which wheels

Squares were usually fitted with a WM3 x 18 rim. Singles and twins usually had the WM2 x 19 rim. The rolling radius is much the same for either option.
by paul.jameson
Fri Oct 16, 2020 8:28 pm
Forum: Member's Bikes
Topic: SpAriel MkII aka The Hermanator
Replies: 153
Views: 47887

Re: SpAriel MkII aka The Hermanator

To understand the X suffix to engine number DJ2050X you need to refer to the Service Bulletins, in this case number 85 of September 1949. The relevant section reads: " ALL SINGLE CYLINDER MODELS. PISTON AND OIL PUMPS. MODIFICATION. All 1949 models incorporating the letter 'X' after the engine s...

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