Author Topic: 1952 A7 valve gear  (Read 2346 times)

Offline duTch

  • Ricketty Rocketty Golden Flashback
  • Wise & Enlightened
  • *
  • Join Date: Oct 2011
  • Posts: 4528
  • Karma: 41
Re: 1952 A7 valve gear
« Reply #30 on: 10.07. 2018 09:12 »
 
Quote
.......There is a little play in the breather hole that fits on the cam gear wheel pin.......

 Please explain further..  *conf*

 
Quote
........Could the sound be because of the advance retard springs having lost their tension??..
   aaah... *conf2*...how do you figure that ???
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Offline anjimehra

  • Valued Contributor
  • ****
  • Join Date: Feb 2009
  • Posts: 343
  • Karma: 0
    • venture on wheels
Re: 1952 A7 valve gear
« Reply #31 on: 10.07. 2018 09:32 »
Timing side noises may be from wear in idler pinion or idler pinion bushes. Also possible that the crankshaft pinion may not be a tight fit on the shaft and is rocking on the woodruff key.
Hi Julian
Thanks., but the bushings have all been changed, & theres no excessive backlash in the gears.

Online muskrat

  • Global Moderator
  • Wise & Enlightened
  • **
  • Join Date: Jul 2009
  • Posts: 10760
  • Karma: 130
  • Lithgow NSW Oz
    • Shoalhaven Classic Motorcycle Club Inc
Re: 1952 A7 valve gear
« Reply #32 on: 10.07. 2018 10:15 »
G'day Anji.
Clutching at straws now! I've listened to the video quite a few times now.
With the motor running pull the right hand spark plug cap off, keep it running on the left. Does the noise diminish? Then do the same the other side. This is the standard big end knock test.
Feel free to take more videos with varying revs and the above test and email it to me.
Cheers
'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
Australia
Muskys Plunger A7

Online Greybeard

  • Jack of all trades; master of none.
  • Wise & Enlightened
  • *
  • Join Date: Feb 2011
  • Posts: 9811
  • Karma: 49
Re: 1952 A7 valve gear
« Reply #33 on: 10.07. 2018 10:49 »
I have to say, when I recently managed to get a pushrod on the edge of the follower during tappet adjustment, that then dislodged, causing huge tappet clearance, the engine sounded rather like that: https://youtu.be/9AdUATO7uRI
Greybeard (Neil)
2023 Gold Star
Supporter of THE DISTINGUISHED GENTLEMAN'S RIDE https://www.gentlemansride.com

Warwickshire UK


A Distinguished Gentleman Riding his 1955 Plunger Golden Flash