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by jj.palmer
Thu Nov 28, 2019 12:10 pm
Forum: Four stroke
Topic: 1953 single rear brake cable
Replies: 6
Views: 320

Re: 1953 single rear brake cable

Similar problem on my swinging arm NH350 some years ago, a very tight bend in the cable. I straightened the cable out by making an extended brake anchor plate which allowed the brake drum to rotate slightly anticlockwise.

John P.
by jj.palmer
Sat Nov 09, 2019 6:39 pm
Forum: Four stroke
Topic: Forks leaking oil
Replies: 4
Views: 1220

Re: Forks leaking oil

Maurice, I am having a similar problem, if you goto the 4 stroke secton on this forum and then goto "Front fork oil leak" dated Fri Oct 18th you may find some helpful information.

John P.
by jj.palmer
Wed Oct 23, 2019 1:20 pm
Forum: Four stroke
Topic: Front fork oil leak.
Replies: 7
Views: 3546

Re: Front fork oil leak.

Have now received the new seals, they are a slightly tighter fit in the seal carrier than the old ones but I put this down to the old ones possibly having slightly worn on the outside diameter due to their movement within the seal carrier. I still do not think that the tightness of the new ones is s...
by jj.palmer
Sat Oct 19, 2019 4:58 pm
Forum: Four stroke
Topic: Front fork oil leak.
Replies: 7
Views: 3546

Re: Front fork oil leak.

Paul S, I will order some new seals and see if they are a tighter fit, if not I'll resort to fitting a spacer has proposed. Paul J, followed your suggestion and polished the surface over the length of the seal, came out very well with no measurable material being removed, see pics, the surface to th...
by jj.palmer
Fri Oct 18, 2019 5:50 pm
Forum: Four stroke
Topic: Front fork oil leak.
Replies: 7
Views: 3546

Front fork oil leak.

Although having renewed the stanchions, bushes and seals a few years ago wth little mileage since, oil is still getting past the oil seal into the upper part of the oil seal carrier, see fig 1. Note it has the correct top bush for the later stanchions. I suspect what may be happening is that has the...
by jj.palmer
Sun Sep 29, 2019 7:22 pm
Forum: Ariel Talk
Topic: Kh twin rebuild
Replies: 2
Views: 3013

Re: Kh twin rebuild

Looking very smart Lee, when you come to fitting the timing chain and sprockets I followed the attached method which I found much easier than the one prescribed.

John P.
by jj.palmer
Sun Sep 29, 2019 7:14 pm
Forum: Four stroke
Topic: Engine revs rising when air lever opened
Replies: 38
Views: 10696

Re: Engine revs rising when air lever opened

If, as suggested, the spindles are hardened, you can check this with a file, then you will require someone with "spark errosion" facilities ie EDM "Electrical Discharge Machining". This process will create a hole through the hardened surface.

John P.
by jj.palmer
Thu Sep 19, 2019 1:44 pm
Forum: Four stroke
Topic: Eye Bolt Huntmaster Gearbox
Replies: 21
Views: 1728

Re: Eye Bolt Huntmaster Gearbox

The eye bolt and its adjusting nut act as a "adjustable mechanical stop" (as opposed to a friction stop) similar to the ones that are fitted either side of the rear wheel, all three are essential to ensuring that both drive chains maintain their correct tension. It is therefore important t...
by jj.palmer
Mon Sep 09, 2019 12:46 pm
Forum: A Bad thing happened to my Ariel
Topic: "That hasn't happened before . . ."
Replies: 24
Views: 11679

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

One of the problems with bolts and locking nuts in this type of situation is that when the lock nut is tightened it may cancel out the tightening affects of the bolt. The lock nut is applying an opposing force to that of the bolt and may change the thread seating faces, therefore has the bolt stretc...
by jj.palmer
Sat Aug 31, 2019 12:15 pm
Forum: Main Chat Forum
Topic: Ariel twin
Replies: 69
Views: 15829

Re: Ariel twin

Paul, The weight of the original sized piston assembly ie piston, rings and pin, was - Near side 240.9 grams Off side 243.1 grams Average 242 grams Estimated original weight = 242 grams + 3 grams (wear loss) = 245 grams. When statically balanced with the above piston assemblies the crank assembly sh...

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