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by will_curry
Wed Jul 28, 2021 2:53 am
Forum: Four stroke
Topic: Square four pressure problems again
Replies: 19
Views: 226

Re: Square four pressure problems again

Your relief valve doesn't look anything like the ones I've come across. In these the ball and spring fit inside the body and are held in with a split pin and the whole body screws into the end of the crank. When the valve opens the excess oil escapes through a hole in the end of the valve. It's not ...
by will_curry
Sat Jul 03, 2021 2:52 pm
Forum: Four stroke
Topic: Monoblock settings on a VH500
Replies: 9
Views: 273

Re: Monoblock settings on a VH500

Of course it's worth trying to get the carb you've got to work properly. I'd also forgotten that yours has an iron head which are - I think - 1"3/16 anyway. Another point which may have some bearing is that according to my notes a 389/30 was fitted to a Greeves scrambler and so may be rather sp...
by will_curry
Fri Jul 02, 2021 7:09 pm
Forum: Four stroke
Topic: Monoblock settings on a VH500
Replies: 9
Views: 273

Re: Monoblock settings on a VH500

According my book of words 389/030 is 1"3/16 which is perhaps a little large for a trials Ariel but about ideal for a high compression lumpy-cammed scrambler. I use an 1"1/16 monobloc on my trials Ariel with standard road jets: 200 main, 30 pilot, 3 1/2 slide and 106 needle jet. First kick...
by will_curry
Sat Jun 26, 2021 8:09 pm
Forum: Four stroke
Topic: NH350 1954 Fork Top Plugs
Replies: 7
Views: 299

Re: NH350 1954 Fork Top Plugs

I'll be interested to know how that works. My concern would be in getting the oil out of the threads of the oil seal holder well enough for the Wellseal to work. The oil can be under quite a bit of pressure at the top there when the forks are fully extended. The factory method was to wind three or f...
by will_curry
Sat Jun 26, 2021 3:52 pm
Forum: Four stroke
Topic: Fork oil change?
Replies: 10
Views: 267

Re: Fork oil change?

I'm no stranger to loud noises from Ariel and BSA forks at their limits of travel as I used to trial them. The arrangements for limiting extension - topping out - never struck me as all that reliable but the tapered restrictor plug in the fork bottom seemed to work, except once when the forks jammed...
by will_curry
Sat Jun 26, 2021 3:25 pm
Forum: Four stroke
Topic: NH350 1954 Fork Top Plugs
Replies: 7
Views: 299

Re: NH350 1954 Fork Top Plugs

The only sure way I know to fit and remove the oil seal holders without
damaging them is by using the proper tool and to use it the forks have to
come out of the yokes.
by will_curry
Sat Jun 26, 2021 3:44 am
Forum: Four stroke
Topic: Fork oil change?
Replies: 10
Views: 267

Re: Fork oil change?

I don't recall seeing anywhere any recommendation as to when the fork oil should be changed. I change it whenever the forks have to come out which isn't that often and the forks don't seem to be suffering for it. Four of my Ariels I've had for over 50 years. I use whatever straight SAE 30 oil happen...
by will_curry
Fri Jun 25, 2021 9:09 pm
Forum: Four stroke
Topic: Fork oil change?
Replies: 10
Views: 267

Re: Fork oil change?

As my copy of Waller is still open from a previous post . . . '17" to 18" below the top of the top yoke with the bike unladen and upright' to paraphrase. As to syphoning the old oil out I couldn't make it work the one time I tried. Has anyone else managed it? Given the shape of the restric...
by will_curry
Fri Jun 25, 2021 7:58 pm
Forum: Four stroke
Topic: NH350 1954 Fork Top Plugs
Replies: 7
Views: 299

Re: NH350 1954 Fork Top Plugs

Glad to have helped.

What grade oil did you use? Waller recommends SAE 30 which is thick by modern
standards. While the seals may well be the source of the leak it's not unknown for
oil to make it's way out via the threads which hold the oil seal holder to the slider.
by will_curry
Sun Jun 20, 2021 3:54 pm
Forum: Four stroke
Topic: NH350 1954 Fork Top Plugs
Replies: 7
Views: 299

Re: NH350 1954 Fork Top Plugs

My experience with these is mixed - some are free enough to remove by hand after the initial tightness has been undone with the big spanner while others require spannering all the way out. This I've attributed to damage to the long and fine threads involved. The alloy top yoke is not immune to bendi...

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