Author Topic: Christmas present to myself !!  (Read 747 times)

Online chaterlea25

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Christmas present to myself !!
« on: 25.12. 2020 21:53 »
Hi All,
Knowing how I was struggling with my f**ked knee starting my SR during the year and that I the replacement knee joint op was imminent I ordered an electric starter kit from Steve McFarlane , It arrived in time to place it under the Christmas tree!!  LOL
I have to say I am impressed with  the quality and engineering of the kit, it comes with everything needed to do the conversion, I mean everything!!
Although the kit has been on the market for five or six years I was a bit surprised that my kit is numbered 164
indicating only that many have been made ?
It will be some while yet before I will be fit enough to get the bike on the bench to start work on it
I will be overhauling the gearbox as it has started to jump out of third when pushed hard . I am also hoping to finish the Suzuki clutch conversion that has been sitting there for longer than I care to remember
A couple of photos borrowed from "startyourbsa,co,uk"

Looking forward to getting back on the road
John
1961 Super Rocket
1963 RGS (ongoing)

Online muskrat

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Re: Christmas present to myself !!
« Reply #1 on: 25.12. 2020 22:00 »
 G'day John.
You've got a long winter to do it. Take your time. Many more miles smiles to come.
*yeah*
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Online RichardL

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Re: Christmas present to myself !!
« Reply #2 on: 25.12. 2020 22:47 »
Here's the big takeaway from this (and Steve McFarland could market on it), a great engineer recognizes this kit as great engineering.

Richard L.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020. This year it's a solo or pillion ride in dapper attire. Watch website at https://www.gentlemansride.com for details.


Online Colsbeeza

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Re: Christmas present to myself !!
« Reply #3 on: 25.12. 2020 23:47 »
Hi John,
Good on ya.! I also am looking into Stephens electric start. Becoming inevitable as we get older.
I have heard only good things about it.
Does any A10 owner have a longer experience on the ups & downs of this?
My main concern is that Stephen wants my cush parts for machining on his jig.
Postage from Oz to UK and back ?? - Risky. :-\
It is on my January to-do list.!
Col
1961 Golden Flash
Australia

Online chaterlea25

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Re: Christmas present to myself !!
« Reply #4 on: 26.12. 2020 00:31 »
Hi Col,
I had a spare sprocket and cush drive parts so I was able to send those instead of the ones on the bike
Just saved having another bike in bits
Maybe you could source a set in UK and send them those rather than your own?

John
1961 Super Rocket
1963 RGS (ongoing)

Online RDfella

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Re: Christmas present to myself !!
« Reply #5 on: 26.12. 2020 20:19 »
I note the two bigger bearings in the kit are one-way (sprag) bearings. I believe most kits put these on the crank, but when I started designing an electric start conversion I found a problem: the small ones (eg ID of 20mm or less) were not only physically too small, but wouldn't take the torque (max 68Nm) whilst larger ones are limited to max revs below useful engine revs - eg ones with 35mm I.D. are limited to 3,600rpm. Couldn't find a way around this, so am presently building a centrifugal ratchet instead. Proving to be a bit of a challenge to get the strength required into the space available.
'49 B31, '49 M21, '53 DOT, '58 Flash, '00 Firestorm, Weslake sprint bike.

Offline a10gf

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Re: Christmas present to myself !!
« Reply #6 on: 26.12. 2020 22:32 »
Excellent, congrats++
That many parts in the kit  *eek* and with the development time + testing etc, looks like it's surely worth whatever it costs.

A10 GF '53 My A10 website
"Success only gets you a ticket to a much more difficult task"

Online Colsbeeza

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Re: Christmas present to myself !!
« Reply #7 on: 27.12. 2020 04:57 »
Hi John,
It would be best if I can obtain another cush set. I'll see how I go.
RDFella, bears thinking about.!
Col
1961 Golden Flash
Australia

Online chaterlea25

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Re: Christmas present to myself !!
« Reply #8 on: 27.12. 2020 15:04 »
Hi RD,
I saw on another forum where Andy Higham made jis own electric starter for a replica gold star, after sprag bearing failures he got one from a modern Enfield and successfully adapted that to fit his set up

John
1961 Super Rocket
1963 RGS (ongoing)

Online Bsareg

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Re: Christmas present to myself !!
« Reply #9 on: 27.12. 2020 17:34 »
I've fitted the Pearson starter kit to the goldie and it uses a bendix throwing a ratchet into mesh. Works really well and only leaves a chain and one bearing turning when engine is running. Can be used with manual advance as there's not the same risk with a kickback as there is with a sprag. Mr Pearson doesn't say it can be used with a swingarm A10 but isn't the primary case the same except for the little drop edge on top of the inner?
C11,B40,B44 Victor,A10,RGS,M21,Rocket3,REBSA

Online muskrat

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Re: Christmas present to myself !!
« Reply #10 on: 27.12. 2020 18:10 »
G'day fellas.
On the subject of sprag starter clutches. My rHonda used to eat them, a very weak design with only 3 rollers. Got a kit where a Yummahaha R6 sprag clutch with about 20 little hourglass shaped rollers is married to the Honda. Just have to look at the start button and the beast comes to life.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Online RDfella

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Re: Christmas present to myself !!
« Reply #11 on: 27.12. 2020 19:05 »
Trouble around aftermarket fitments is that bikes made with electric starters were designed that way, with their sprag clutches in the crankcase oil. It's when you isolate them in self-contained units that the rev limits seem to apply.
I've looked at this from so many directions - a bendix coming onto a crank-mounted gear (but by then it'd be rev-reduced, so the bendix would be unlikely to 'throw' and it'd also need a reverse helix compared with readily-available Lucas ones). In my case too, primary is belt drive meaning a) sprocket is wide, leaving only 1" of exposed shaft for nut and b) because the primary runs dry, the idea of running a layshaft at 3 x engine speed in there is not an option.

Add:
Forgot to make clear - the problems I'm having trying to engineer an electric starter is on my project, not my A10.
'49 B31, '49 M21, '53 DOT, '58 Flash, '00 Firestorm, Weslake sprint bike.

Online Bsareg

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Re: Christmas present to myself !!
« Reply #12 on: 27.12. 2020 20:07 »
You're right RDfella. I had to revert to chain primary drive in order to use the Pearson starter.
C11,B40,B44 Victor,A10,RGS,M21,Rocket3,REBSA

Online chaterlea25

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Re: Christmas present to myself !!
« Reply #13 on: 27.12. 2020 21:04 »
Hi Reg,
I have looked at the web photos of the Pearson setup, The reduction to the crank via a chain looks to be in the region of 3 or 4 to 1, so the small sprocket is spinning that many times faster than the crank, ? that seems a lot for a  chain and sprocket?
The McFarlane gear on the sprag bearings is a little smaller than the crank gear (I haven't counted the teeth numbers yet) so there is not a huge increase in the speed there

It would need the alloy plate that bolts to the crankcase changing to the single cylinder bolt pattern to get the McFarlane starter to fit the singles

John
1961 Super Rocket
1963 RGS (ongoing)

Online mikeb

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Re: Christmas present to myself !!
« Reply #14 on: 30.12. 2020 08:23 »
that's a nice Christmas present John.

Quote
wouldn't take the torque (max 68Nm)...
RD - are you saying the torque required in 68Nm or the sprag gears were rated at that?
i've read elsewhere a rule of thumb is a 1000cc twin requires a starter with 12.5Nm and a reduction of 10:1 -> 125Nm... so (guessing) an A10 2/3 of that...? your thoughts?

...btw a pic attached of a local guy who made an electric leg for his goldie - with a NEB belt. due to the the gear to the sprag being on the inside at the crank end, the clutch basket had to be spaced out a bit. starter underneath like the srm one. quite an achievement.
New Zealand
'61 Super Rocket  - '47 B33 -  '18 Triumph Street Triple RS