Arc Engineering Electric start

DAVE BRADY · 12 May, 2024, 18:59:36

Hi,

Has anyone bought and fitted or even seen one of the Arc Engineering electric start kits for the A50/A65?

Dave.

Lone Wolf · 12 May, 2024, 20:01:02

Quote from: DAVE BRADY on 12 May, 2024, 18:59:36
Hi,

Has anyone bought and fitted or even seen one of the Arc Engineering electric start kits for the A50/A65?

Dave.

Wotcha.

Yes - I've fitted one to my Thunderbolt.

There were a few "teething troubles", most of which have now been sorted out.
With any luck, folks who buy the kit now, shouldn't have any problems.

The only niggle is the clutch, which now runs dry and tends to grab ( well mine does ) - I'm currently working on a cure for that.

DAVE BRADY · 12 May, 2024, 20:32:12

Hi,

Will you be taking it to the National Rally? Keen to see one.

Dave.

Lone Wolf · 12 May, 2024, 23:42:29

Quote from: DAVE BRADY on 12 May, 2024, 20:32:12
Hi,

Will you be taking it to the National Rally? Keen to see one.

Dave.

Wotcha.

I could take it - OK, the clutch won't be ideal, but it will give you an idea of what they are like.
As far as starting the bike goes, it can't be faulted.
( Looks like the A65 is coming with me then ).

Lone Wolf · 16 May, 2024, 11:37:27

Quote from: DAVE BRADY on 12 May, 2024, 20:32:12
Hi,

Will you be taking it to the National Rally? Keen to see one.

Dave.

Wotcha.

UPDATE - I've currently got the clutch off. Riding the bike in stop-start traffic was nigh on impossible.
If I get the oil seal modification done in time, then I'll bring the A65.

DAVE BRADY · 16 May, 2024, 14:15:53

Hi,

OK. Thanks for this.

Dave.

Allan G · 17 May, 2024, 14:00:41

Quote from: Lone Wolf on 16 May, 2024, 11:37:27
Quote from: DAVE BRADY on 12 May, 2024, 20:32:12
Hi,

Will you be taking it to the National Rally? Keen to see one.

Dave.

Wotcha.

UPDATE - I've currently got the clutch off. Riding the bike in stop-start traffic was nigh on impossible.
If I get the oil seal modification done in time, then I'll bring the A65.

When Ark first launched the clutch kit I asked they if they could make it comparable with a BNR belt drive as it was far superior to the poor clutch they are offering. They refused to budge and said their clutch would be more than adequate. So I decided I wouldn't have one.

Lone Wolf · 23 May, 2024, 00:23:39

Wotcha.

Well after much measuring, machining, welding and cussing

I've made the clutch oil seal mounting. It means the clutch works as it should, with no grab or snatch. On the downside it leaked from where the starter motor fits . . . . so off it all came and a new one piece gasket was made and fitted. So far the oil seems to be staying where it should. I've yet to take the bike out on test, but that may happen tomorrow. ( weather permitting ).
So it looks like I will be taking the A65 to the open day this weekend.

Lone Wolf · 23 May, 2024, 00:26:35

Quote from: Allan G on 17 May, 2024, 14:00:41

When Ark first launched the clutch kit I asked they if they could make it comparable with a BNR belt drive as it was far superior to the poor clutch they are offering. They refused to budge and said their clutch would be more than adequate. So I decided I wouldn't have one.

Wotcha.

The advertising says "improves transmission" - well in my case it didn't - in fact it did exactly the opposite. It made the clutch so grabby that the bike was a chore to ride. Hopefully I've now sorted that out. I intend to email Shropshire Classics and ask them what they suggest I do to make the clutch useable. It will be interesting to see their reply.

DAVE BRADY · 23 May, 2024, 08:13:08

Hi,

As it is a belt drive I thought it would run dry with a sealed clutch bearing.

Dave.

Allan G · 23 May, 2024, 15:02:41

The clutch is a copy of the old Hayward type. I might be tempted to get one, then ask Bob Newby to make me a new basket for which to mount the ring gear.

However I beleive a couple of other BSA Specialists are also looking down this road.

EDDIE SIMPSON · 24 May, 2024, 00:35:08

what type of clutch comes with the kit , multiplate or diaphram?
a norton diaphram clutch could offer the best clutch settup but whatever type the grabbing is due to a over strong spring or springs is it not?
does the ark kit use a ballast resister to feed 6 volt coils like the commando?

Allan G · 24 May, 2024, 12:16:36

The clutch is a copy of the Tony Hayward clutch using the same inadequate 3 spring Cush drive unit. The BNR clutch is multiplate. But it is far superior in every way.

Not sure why the Norton comes with 6v coils. It shouldn't really matter as the electric boot is independent from the ignition system.

EDDIE SIMPSON · 25 May, 2024, 00:20:25

hi allen
i ve used gpz500 clutch springs in a 3 spring with surprisingly good results as their springs are good quality .
electric start triumphs and nortons used a ballast resister and six volt coils to aid cold morning ignition starts with a lower than 12 volt supply while the starter motor draws most of the amps from the battery at the same time.
i wonder whether any modern kit would run into cold morning non starts draining the battery too quick.

Allan G · 26 May, 2024, 09:03:19

Quote from: EDDIE SIMPSON on 25 May, 2024, 00:20:25
hi allen
i ve used gpz500 clutch springs in a 3 spring with surprisingly good results as their springs are good quality .
electric start triumphs and nortons used a ballast resister and six volt coils to aid cold morning ignition starts with a lower than 12 volt supply while the starter motor draws most of the amps from the battery at the same time.
i wonder whether any modern kit would run into cold morning non starts draining the battery too quick.

Makes sense. Is the ballast resistor bypassed during the cranking procedure? You could place the BR on the positive side of the coil, then have a relay connected to the temporary on (cranking) position on the switch to link the coil directly to positive side of the battery and bypass the ballast resistor.

I'm sure I read once that some older cars did this.