Author Topic: A7 SS 500cc (timing)  (Read 2530 times)

Offline Topdad

  • bob hebdon
  • Wise & Enlightened
  • *
  • Join Date: May 2011
  • Posts: 2227
  • Karma: 32
  • l
Re: A7 SS 500cc
« Reply #15 on: 01.05. 2013 14:34 »
Thanks Musky, that confirms it I'm sticking with my high tech pencil !! cost 25 p regards Bob
" rules are made for the guidance of wise men and the blind obediance of fools"
United Kingdom

Online bsa-bill

  • Wise & Enlightened
  • *
  • Join Date: Mar 2006
  • Posts: 5413
  • Karma: 61
Re: A7 SS 500cc
« Reply #16 on: 01.05. 2013 18:20 »
Quote
and that would only work with flat top pistons.
Hi Musky - do you mean by those words that the tool would not work because the shape of the head would jam the rod in the tool I wonder.
I reckon as long as the thing goes up and down then the shape of the piston is irrelevant, take your point re the angle but that is calculable (  and probable well within the tolerance of my eyes and a pencil mark  *smiley4*).
I have used a dial gauge on pistons and the big advantage is that it will show movement right upto TDC and down again as opposed to my experience where my to eyes it appears the pistons don't move for a short period before and after TDC, hence the primary chain method of marking the travel at this point and dividing it.
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline muskrat

  • Global Moderator
  • Wise & Enlightened
  • **
  • Join Date: Jul 2009
  • Posts: 8160
  • Karma: 106
  • Lake Conjola NSW Oz
    • Shoalhaven Classic Motorcycle Club Inc
Re: A7 SS 500cc
« Reply #17 on: 01.05. 2013 20:35 »
 G'day Bill. With high tops (like I use *grins*) it adds another angle. As the piston moves up the tool point will move outward and also down the crown. You can imagine if the angles are a particular way the piston movement would not register on the dial.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline a10gf

  • Wise & Enlightened
  • *
  • Join Date: Sep 2006
  • Posts: 2766
  • Karma: 42
  • West Coast, Norway & Alpes Maritimes, France
    • A10 GF
Re: A7 SS 500cc
« Reply #18 on: 01.05. 2013 20:53 »
^^^ see my anti-angle tool  *smile*  at least works good on flat piston.

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

Offline muskrat

  • Global Moderator
  • Wise & Enlightened
  • **
  • Join Date: Jul 2009
  • Posts: 8160
  • Karma: 106
  • Lake Conjola NSW Oz
    • Shoalhaven Classic Motorcycle Club Inc
Re: A7 SS 500cc (timing)
« Reply #19 on: 02.05. 2013 05:10 »
As long as the "tool/measuring device" is vertical it would work on any piston.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7