Author Topic: 1960 a10 superocket hard starting  (Read 1797 times)

Offline wole

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1960 a10 superocket hard starting
« on: 13.12. 2016 18:49 »
Hi all my superocket is a pig to start. In the past someone  I think has rebuilt it with a racing mag and proberly high lift cam and hc pistons. I am going to measure the lift of cam. When I have this measurement can the cam be identifiyed?. Also what cr pistons would give me Easy starting.thanks wole

Online KiwiGF

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Re: 1960 a10 superocket hard starting
« Reply #1 on: 13.12. 2016 19:15 »
Does it not fire? Or is it just very had to kick it over?

My a10 gf is easy to kick over with a 356 cam and 7.25 cr Pistons.

I've kicked over an original a10 gf with 6.5cr and 334 cam and in comparison to mine could hardly feel the compression it was so easy to kick over!
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Offline wole

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Re: 1960 a10 superocket hard starting
« Reply #2 on: 13.12. 2016 19:49 »
Hi it is fairly hard to kick over as I am 67 on full advance it kicks back. if slightly retarded it will not fire. I just have to kick it over on full advance until it does start

Online Bsareg

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Re: 1960 a10 superocket hard starting
« Reply #3 on: 13.12. 2016 20:10 »
Sounds like a weak mag. Do you have a good spark when retarded?
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Online RichardL

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Re: 1960 a10 superocket hard starting
« Reply #4 on: 13.12. 2016 20:18 »
Could be the mag, but spark strength is easy to check. Also, could be that ol' devil pilot jet gunked up. My guess is that the first few kicks are not a problem but it gets harder as exhaustion sets in.

What's the plan for measuriing lift, dial indiacator on the end of the rocker arm?

Richard L.
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Online RichardL

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Re: 1960 a10 superocket hard starting
« Reply #5 on: 13.12. 2016 20:20 »
Plan on signing up for the world-wide 2017 DISTINGUISHED GENTLEMAN'S RIDE on September 30, 2018. Watch website at https://www.gentlemansride.com for details.

Offline Topdad

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Re: 1960 a10 superocket hard starting
« Reply #6 on: 14.12. 2016 11:01 »
have you checked the timing .if so what was the figure btdc. my cr is 8.25 ,spitfire cam whilst good comp not that hard to crank ,I'm nearly 67 ( jan ) ( *whistle*date can be provided for any donations ) 
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Online muskrat

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Re: 1960 a10 superocket hard starting
« Reply #7 on: 14.12. 2016 11:06 »
G'day wole.
Are you 100% sure the timing is correct? With manual advance/retard loose wire = advanced, tight wire = retard.
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Offline wole

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Re: 1960 a10 superocket hard starting
« Reply #8 on: 14.12. 2016 16:01 »
Hi I have set timing to the Manuel. Which I believe is 3/8 Btdc fully advanced

Online chaterlea25

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Re: 1960 a10 superocket hard starting
« Reply #9 on: 14.12. 2016 18:06 »
Hi,
+ 1 on all the previous suggestions,
As you are losing spark strength when you retard the mag, one or two pointers that may help
Very few mag guys have the proper strength magnetiser to remagnetise the mag once its assembled
Some were also fitting sub standard capacitors that are not up to the job ??
Check the points for blackening ? clean them and see if starting improves ?
I think you will find that 3/8in. BTDC is a bit too much with the fuel we have to cope with now a days
I would bring it back to nearer 5/16in.

I have a Super Rocket in a similar state of tune, manual mag etc, I found it runs and starts better at 35 degrees before TDC (if my memory is correct??)

John

1961 Super Rocket
1963 RGS (ongoing)

Online RichardL

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Re: 1960 a10 superocket hard starting
« Reply #10 on: 14.12. 2016 19:07 »
Never having had to (gotten to?) start a manual.advance bike, I made the assumption that if the timing can be advanced to the point of kickback, it could be retarded to the right spot for starting. Wouldn't this make the setting of timing at full advance less critical, since it can be backed off manually?

Richard L.
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Online Bsareg

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Re: 1960 a10 superocket hard starting
« Reply #11 on: 14.12. 2016 19:41 »
Auto timed mags open the points when the armature is around max magnetic flux density,   on manual mags retarding  ignition brings points away from the most efficient fluxes density causing reduction of ht voltage at the plug
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Online Triton Thrasher

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Re: 1960 a10 superocket hard starting
« Reply #12 on: 14.12. 2016 19:46 »
With manual advance/retard loose wire = advanced, tight wire = retard.

Should be, but it's not impossible to have the opposite.

Offline wole

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Re: 1960 a10 superocket hard starting
« Reply #13 on: 14.12. 2016 21:02 »
Yes I agree with richard. I can adjust the timing to where ever needed.but if I retard it even slightly it does not fire

Online Bsareg

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Re: 1960 a10 superocket hard starting
« Reply #14 on: 14.12. 2016 21:07 »
Retard your ignition and look at the colour of the spark, should be blue with an audible  snap. A pink spark will be useless under cylinder compresstion
C11,B40,B44 Victor,A10,RGS,M21,Rocket3,REBSA