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by nevhunter
Thu Sep 12, 2019 4:49 am
Forum: Main Chat Forum
Topic: Does this seat use the lycette springs
Replies: 10
Views: 1169

Re: Does this seat use the lycette springs

John, I've found a couple of old seat frames just like these with exactly the same rubber bits (remnants of). That stuff from CZ looks really classy, Nev
by nevhunter
Wed Sep 11, 2019 11:58 pm
Forum: Four stroke
Topic: 1955 NH gearbox oil change
Replies: 12
Views: 2979

Re: 1955 NH gearbox oil change

There MUST be something wrong with it. It's usually the sleeve gear with the small gear that engages with it on the end of the Layshaft that gets the most wear as it's engaged in all gears bar top. IF it's definitely ONLY 3rd its involved with one (or both) of the two gears you see when you first re...
by nevhunter
Tue Sep 10, 2019 8:50 am
Forum: A Bad thing happened to my Ariel
Topic: "That hasn't happened before . . ."
Replies: 24
Views: 4563

Re: "That hasn't happened before . . ."

Alan (above) describes it correctly The oversize shank is a neat fit in the sprocket holes and originally would all have been a good fit. Going oversize would be formidable unless you just get Acme to do the threads a small bit oversize and I recently made a new sprocket with one less tooth as that ...
by nevhunter
Tue Sep 10, 2019 4:39 am
Forum: Four stroke
Topic: Drags alluminium rockerbox gaskets for singles
Replies: 2
Views: 1717

Re: Drags alluminium rockerbox gaskets for singles

Where the rocker ends up (and the lifter operation) is determined by the minimum length the pushrod protrudes above the head top face, AND the gasket thickness. Your pocketed valves will alter the tappet adjustment/ clearance if that's the issue. Cam follower face wear or the cam base radius and pus...
by nevhunter
Tue Sep 10, 2019 4:30 am
Forum: Ariel Talk
Topic: Oil not returning KH 500 Twin
Replies: 5
Views: 1939

Re: Oil not returning KH 500 Twin

They certainly have a good rate of oil return, and it swirls all around just below the filler if you have the correct tank on. It's a double gear type driven off the camshaft and right down in the bottom of the crankcase. Anytime you are starting a new or long standing motor it's worthwhile to add o...
by nevhunter
Sun Sep 08, 2019 5:51 am
Forum: Member's Bikes
Topic: My 1926 Ariel
Replies: 5
Views: 1590

Re: My 1926 Ariel

Got a lot of good features Like OHV single port and a strong gearbox mount, Decent sized brakes. You will be impressed how good these OHV 500's go. Good luck with it . Nev
by nevhunter
Sun Sep 08, 2019 5:46 am
Forum: A Bad thing happened to my Ariel
Topic: "That hasn't happened before . . ."
Replies: 24
Views: 4563

Re: "That hasn't happened before . . ."

The plain section of the new bolts is hopefully quite a neat fit in the holes in the sprocket.If your threads etc are worn I wouldn't be surprised if you continue to get problems.The back of the flange where you have put the "lock"nuts is an as cast surface and may need to be machined dead...
by nevhunter
Sun Sep 08, 2019 5:32 am
Forum: Ariel Talk
Topic: Magdyno conversion......
Replies: 7
Views: 2153

Re: Magdyno conversion......

Needs more RPM than it gets there and is also alternating current from a permanent magnet so hard to regulate and needs a diode to enable a battery to be charged from it. Nev
by nevhunter
Fri Sep 06, 2019 1:39 am
Forum: Four stroke
Topic: 1955 NH gearbox oil change
Replies: 12
Views: 2979

Re: 1955 NH gearbox oil change

While the original recommendations were engine oil it's a long time since the formulation changed due the environmental effects of additives and catalytic converters. Modern engine oils do not suit gearboxes anymore. Tractor oil universal does and also OK for the forks and hydraulic and wet clutches...
by nevhunter
Wed Sep 04, 2019 8:43 am
Forum: Ariel Talk
Topic: VALVE TIMING
Replies: 9
Views: 1448

Re: VALVE TIMING

And that gives a vernier effect where very small incremental adjustment is available. You can't really TRUST the marks unless they have been verified by a disc . Your cams "degrees" are achieved with a specified clearance also where the ramps are eliminated to make it easier to be precise....

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