Author Topic: Pinking and issue  (Read 819 times)

Offline BSA500

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Pinking and issue
« on: 06.09. 2018 21:36 »
Hi
 The A7ss is having terrible issues with pinking. Ah just reftme the engine you say but that's the issue. I cannot get the atu off as the extractor bolt keeps slipping.
How do get it off without damaging the magneto and or the pinion

Online Greybeard

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Re: Pinking and issue
« Reply #1 on: 06.09. 2018 21:44 »
In case you haven't done it, clean, check and adjust the points. The gap affects the timing. You may not need to do more.

Offline BSA500

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Re: Pinking and issue
« Reply #2 on: 06.09. 2018 21:57 »
I will check tomorrow good shout

Online muskrat

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Re: Pinking and issue
« Reply #3 on: 07.09. 2018 13:34 »
G'day BSA500.
As GB said.
Pinging can be very destructive if not rectified. (broke the top ring in 3 of the 4 cylinders in my CB1100F)
You'll need to retard the timing or increase the octane of the fuel or richen the mixture.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Offline BSA500

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Re: Pinking and issue
« Reply #4 on: 07.09. 2018 17:41 »
I tried the highest octane no improvement and the mixture is fine with a little bit of richness. I am feeling regarding the ignition if I can get the pinion off

Offline BSA500

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Re: Pinking and issue
« Reply #5 on: 08.09. 2018 13:29 »
Measured the points gap and it's spot on. So how do I get the pinion off when the extractor bolt doesn't  well extract without damaging the magneto

Offline BSA500

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Re: Pinking and issue
« Reply #6 on: 01.10. 2018 13:10 »
Just bumping this. Winter is starting to draw in so some suggestions and how to do this to keep me occupied would be appreciated.  *smile*

Online BigJim

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Re: Pinking and issue
« Reply #7 on: 02.10. 2018 21:26 »
Am a bear of little brain and this is the first time i have offered advice. Maybe a little heat applied to the centre of advance unit and freezing spray (stuff plumbers use on pipes) on shaft taper. Tapping and levering all at the same time. Assume adv unit will be scrapped so tooth damage irrelevant.  *work* *conf2*
Jamie,  Supporter of Distinguished Gentleman's Ride

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Re: Pinking and issue
« Reply #8 on: 03.10. 2018 09:08 »
G'day BSA500.
Been a long time since I had this problem (25 years). I think I undid the three nuts holding the mag and used timber wedges between the mag flange and c/case. Then applied heat to the center of the advance unit as BJ suggests, screw the nut on a few threads and tap-----Hit-----BELT the nut.
I don't condone brute force but what has to be done, has to be done.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
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Muskys Plunger A7

Offline Triton Thrasher

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Re: Pinking and issue
« Reply #9 on: 03.10. 2018 09:56 »
What is the timing set to now?

Offline wortluck

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Re: Pinking and issue
« Reply #10 on: 04.10. 2018 20:00 »
Tappets were my issue with pinking - as they were completely fubar  *whistle*

Offline BSA500

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Re: Pinking and issue
« Reply #11 on: 09.10. 2018 12:34 »
Timing is set as standard for a A7SS as I have the alloy head. The adv unit fibre cog is new and refurbished so I dont want to destroy it. I am not happy with belting the end of the mag in any circumstance.

Online coater87

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Re: Pinking and issue
« Reply #12 on: 09.10. 2018 13:24 »
Timing is set as standard for a A7SS as I have the alloy head. The adv unit fibre cog is new and refurbished so I dont want to destroy it. I am not happy with belting the end of the mag in any circumstance.

 The fiber gear is the cheapest thing you are dealing with.

 Unless you can figure out a puller, I think your down to tap-tap-tap-a-roo (ala Happy Gilmore).
Central Wisconsin in the U.S.

Offline BSA500

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Re: Pinking and issue
« Reply #13 on: 26.10. 2018 20:11 »
Got it off just light offering on the strongest mounting on atu and off she popped. I think it's 3/16 BTDC what should I aim for to retard a little. No wrong 3/8

Online BigJim

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Re: Pinking and issue
« Reply #14 on: 26.10. 2018 22:32 »
Great to hear atu removed. Will it need to be replaced? maybe a spare/alternative one is a good idea. Am not able to help with timing (sorry) as have A10 iron head. If able and confident it may be worth looking at easing out the mounting holes for the magneto for easy fine tuning of timing. Lots of info on this forum on how to do that and could mean the atu stays on a bit longer if pinking does not go away. Good luck, keep on keeping on.
 *beer* *good3*
Jamie,  Supporter of Distinguished Gentleman's Ride