adrie.degraaff wrote: Tue Nov 03, 2026 2:45 pm This Ariel was at Kempton park and close to the photo,
https://www.youtube.com/watch?v=ZW3Lpy5F3mI

Close...but it's a 500!

SG

...I would like to ask here if you can recommend any sort of documentation that can be of help during the disassembly and rebuild.



The nearest to a workshop manual are the Waller 'Ariel' books (originally published by Pearson). These were always a bit behind new models, I expect you'll need a ...

Pretty certain you wouldn't warp the frame - but have a thorough read of David Anderson's contribution at the end of page 1 here (Simes also!):
viewtopic.php?t=15720

David's done plenty of frame welding, including to the lugs.


SG

I thought it might have been a 1939/40 civilian bike that had hung around a while before being road registered but one of those would have had an instrument panel on the tank - which would also have had a lot of chrome-plate showing and I can't see any of that, although there does look to be a very ...

The images have gone because they weren't posted to the Forum, they were links to images on another website and that website has now been changed.
From what I can see all of the pics on Paul 's earlier posts were done the same way, they just about all seem to be missing.

SG

There's a reference in one of the tuning articles to Hepolite making Dykes-ringed pistons for the Arrow.
Hepolite numbers:
18550 YKR (described as a high-silicon racing piston)
16388Y
15721Y

The last one also appears in the 1963 Hepolite catalogue, along with 14154 which looks identical apart from ...

Got the thing out!
After much messing about with bearing pullers, MAP torches and drifts (see below) I ended up grinding down a section of the steel wall with a dremel (using a narrow cutting disc, which I always find easier to manipulate for taking off metal) and collapsing the reduced section with ...

Just tried a blind puller set but it doesn't want to play...so far. I thought the seal might have shifted out enough to get something behind the steel outer but that doesn't seem to be the case.
Looks like any progress is going to be brutal!

SG

The Arrow's getting new crankshaft seals. The strip-out's gone fairly well until the very last item - the centre oil seal.

The workshop manual says that after removing the bearing the centre oil seal can be easily removed with a drift and mallet....
Well, all I've succeeded in doing is knocking ...

I see it's got the injection specifications and sensor diagnostics which you'll have trouble finding anywhere else....

SG