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by robert.clark
Fri Jun 05, 2020 1:44 pm
Forum: Four stroke
Topic: 500 single replacement std bore piston JP?
Replies: 8
Views: 835

Re: 500 single replacement std bore piston JP?

Update on JP piston std 500cc 7.5 an excess material removal. Now weighs in at 463 gms showing a 3% reduction
by robert.clark
Fri Jun 05, 2020 1:44 pm
Forum: Four stroke
Topic: Which pistons are available for my ariel
Replies: 139
Views: 59615

Re: Which pistons are available for my ariel

Update on JP piston std 500cc 7.5 an excess material removal. Now weighs in at 463 gms showing a 3% reduction
by robert.clark
Tue May 26, 2020 9:12 am
Forum: Four stroke
Topic: Which pistons are available for my ariel
Replies: 139
Views: 59615

Re: Which pistons are available for my ariel

I've re-posted my response in this subject title as it where the data originates. It may be of some use. Ariel Piston Comparisons.xls Thanks all - here's something for the Bank Holiday reading and lockdown. I have trawled through the links (which pistons are available for my Ariel) and come up with ...
by robert.clark
Mon May 25, 2020 1:00 pm
Forum: Four stroke
Topic: 500 single replacement std bore piston JP?
Replies: 8
Views: 835

Re: 500 single replacement std bore piston JP?

Ariel Piston Comparisons.xls Thanks all - here's something for the Bank Holiday reading and lockdown. I have trawled through the links and come up with a piston comparison spreadsheet to try and understand the data provided by various owners. I also added some Hepolite data and details of a new sta...
by robert.clark
Fri May 01, 2020 11:41 am
Forum: Four stroke
Topic: 500 single replacement std bore piston JP?
Replies: 8
Views: 835

500 single replacement std bore piston JP?

I'm looking for a new 500 standard bore piston. I would prefer a Hepolite but know JP's are available. I've read reports that the JP's are heavier, also that the JP's need additional clearance over the Hepolites. I can't find any forum links to experiences with these fitted. Just needing a heads up.
by robert.clark
Fri Dec 06, 2019 12:02 pm
Forum: Four stroke
Topic: Ariel rocker box
Replies: 4
Views: 600

Re: Ariel rocker box

After checking records. The average clearance measurements over 4 rocker sets I've assembled is as follows. Inside the collars at the angle bracket end (so engine drive side) it is common to find a 0.006 inch shim just to prevent face to face contact. The thrust of the spring should allow the rocker...
by robert.clark
Fri Dec 06, 2019 11:31 am
Forum: Four stroke
Topic: Ariel rocker box
Replies: 4
Views: 600

Re: Ariel rocker box

Hi John, 20191001_123537.jpg Been down this path a few times on mine and I am building another at the moment. My method is to loosely assemble the valve rocker gear without the clam shells. The trick is to ensure the spring tangs are located in the small holes in the angle bracket whilst ensuring yo...
by robert.clark
Tue Apr 23, 2019 10:37 am
Forum: Electrics
Topic: Mechanical Regulator Question.
Replies: 4
Views: 5343

Re: Mechanical Regulator Question.

All fitted the new unit works a treat.
by robert.clark
Tue Apr 16, 2019 4:21 pm
Forum: Electrics
Topic: Mechanical Regulator Question.
Replies: 4
Views: 5343

Re: Mechanical Regulator Question.

Alan and Will thanks for responding. I have spent some time fiddling without success and quite frankly this option is against all my normal views on technology upgrades. I've looked at the DVR2 unit, it sounds fine and I've ordered one today.
by robert.clark
Mon Apr 15, 2019 10:25 am
Forum: Electrics
Topic: Mechanical Regulator Question.
Replies: 4
Views: 5343

Mechanical Regulator Question.

So I just rewired my 500cc RH500. New harness, reconditioned dynamo, new mechanical regulator (sure its a Wassel). Soldered joints throughout. Not running with battery connected everything works perfectly with ammeter showing a discharge with lights on. When the bike is running I have a steady 4 amp...

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