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by Simon.Gardiner
Sat Feb 10, 2018 12:34 pm
Forum: Ariel Talk
Topic: VCH Head studs
Replies: 10
Views: 380

Re: VCH Head studs

As far as I'm aware all 5 studs should be the same (check the parts lists...) However, I'm going to be a bit contentious and suggest that leaking from the push-rod tunnel seals is more to do with the current seals not being very well made than an issue with the '5th' stud that goes between them. I'd...
by Simon.Gardiner
Sat Jan 27, 2018 1:07 am
Forum: Member's Bikes
Topic: My new projekt/bike 55 SQ 4 MK ll
Replies: 22
Views: 616

Re: My new projekt/bike 55 SQ 4 MK ll

Rudy:
Many thanks for the info on the mods for the BM front wheel - that'll make it a lot easier for me!

SG
by Simon.Gardiner
Fri Jan 26, 2018 1:23 am
Forum: Member's Bikes
Topic: My new projekt/bike 55 SQ 4 MK ll
Replies: 22
Views: 616

Re: My new projekt/bike 55 SQ 4 MK ll

Hi Rudy Nice looking bike - and welcome! I see you might have already worked out how to fit that BM front wheel, if you're going to use spacers on the BMW spindle would you be able to post the dimensions? (I've got one of those wheels as well, that might need to arrive on the Ariel full-width hub fr...
by Simon.Gardiner
Wed Jan 24, 2018 1:29 am
Forum: Ariel Talk
Topic: Nh sprocket nuts
Replies: 5
Views: 190

Re: Nh sprocket nuts

Full-width hub? I think they're BSF (3/8 or 7/16, can't remember...)
BUT the hole on the sprocket is radiused at the bottom and you need to use the proper nuts (Drags should have them).

HTH

SG
by Simon.Gardiner
Sun Jan 21, 2018 4:13 pm
Forum: Four stroke
Topic: HS/HT/BY valve springs
Replies: 8
Views: 280

Re: HS/HT/BY valve springs

Not an expert but if I remember rightly the early springs (to 1951) were long and considered much too strong (possibly contributing to excessive cam/follower wear); they were superseded with a shorter, weaker but much more appropriate spring. Some discussions here and in a few other places (where yo...
by Simon.Gardiner
Thu Jan 18, 2018 2:00 am
Forum: Member's Bikes
Topic: My new project...
Replies: 21
Views: 795

Re: My new project...

650 bore size is....70mm?
The edge of the combustion chamber should match the cylinder bore I think, so a 66mm chamber would indicate an A7 head?
(Dunno what the sizes of the valves should be for the alloy-head twins)

SG
by Simon.Gardiner
Wed Jan 17, 2018 2:14 pm
Forum: Ariel Talk
Topic: NH350 sprinter - latest
Replies: 16
Views: 427

Re: NH350 sprinter - latest

That hole might be there because a nut tried to escape ;) - and I think I see a 500 twin chaincase inner with the mod that lets you use a twin chaincase on a single!!

SG
by Simon.Gardiner
Sat Jan 13, 2018 1:55 am
Forum: Four stroke
Topic: Gearbox oil for an NH
Replies: 10
Views: 386

Re: Gearbox oil for an NH

...it is the GL5 specification that is supposed to be unsuitable for mechanisms containing copper alloys Hmmmm - BMW insist on a GL5-spec oil for the gearbox and bevel of the old air-head twins (eg my R100RT). I'm pretty sure there will be some bushes in there somewhere. (And I've had a number of d...
by Simon.Gardiner
Thu Jan 04, 2018 2:42 pm
Forum: Four stroke
Topic: Bronze or steel/Babbitt?
Replies: 9
Views: 373

Re: Bronze or steel/Babbitt?

I think the steel-backed babbit bushes are pretty difficult to find now - I've settled for an SRM 'bronze' bush as they must do plenty of these so it must work OK.....

SG
by Simon.Gardiner
Thu Jan 04, 2018 2:31 pm
Forum: Member's Bikes
Topic: My new project...
Replies: 21
Views: 795

Re: My new project...

...I think...this is a Road Rocket head fitted on a Golden Flash engine. Paul: The alloy 650 heads are now quite rare/expensive, might be worth checking that no-one's put an alloy A7 head in the 'basket' - although Mr Carter seems to be running one of those on his Huntmaster very successfully! (If ...

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