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by Simon.Gardiner
Sun Jan 21, 2018 4:13 pm
Forum: Four stroke
Topic: HS/HT/BY valve springs
Replies: 5
Views: 105

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(to 1951) were long and considered much too strong (possibly contributing to excessive cam/follower wear); they were superseded with a shorter, weaker but much more appropriate spring.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: 657

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: 323

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: 304

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: 324

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: 657

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 ...
by Simon.Gardiner
Sun Dec 31, 2017 11:40 am
Forum: Member's Bikes
Topic: My new project...
Replies: 21
Views: 657

Re: My new project...

Alloy head - Road Rocket?? Looks to be a big-bearing crank (difficult to see) - probably as it should be for a '57 bike. But pistons look to be the earlier lower-comp dished-topped ones.....and I think I see the very rare early attempt at providing a left-foot gear change - clearly not properly de-b...
by Simon.Gardiner
Thu Dec 28, 2017 5:55 pm
Forum: For sale/wanted - Parts
Topic: Head Steady Clamps Huntmaster
Replies: 3
Views: 150

Re: Head Steady Clamps Huntmaster

Morning. Wondering if anyone has a pair of spare clamps for a Huntmaster for sale? Bought some from Draganfly recently but these are too small. Thanks. Mike Bit strange, bought mine from Drags about a year ago and they were OK (and I think they were on back order for a few weeks so mine should have...
by Simon.Gardiner
Thu Dec 28, 2017 5:46 pm
Forum: For sale/wanted - Bikes
Topic: VHA 1952
Replies: 20
Views: 797

Re: VHA 1952

David, The late Bob Brassington used to swear blind that the later (iron) head had been detuned by BSA to prevent Ariels from out-performing the parent company's bikes. I've got a '51 'small fin' iron VH head and the '53 'big fin' equivalent and if there are any differences in the porting it's very...
by Simon.Gardiner
Tue Dec 19, 2017 6:35 pm
Forum: For sale/wanted - Parts
Topic: Wanted - Albion Model G gearbox (3 speed hand change)
Replies: 7
Views: 299

Re: Wanted - Albion Model G gearbox (3 speed hand change)

Thanks Adrie - I'll see if I can sort out the details usefully.

SG

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