Author Topic: Speaking of vibration  (Read 13757 times)

Offline Hubie

  • Dave Huybens
  • Valued Contributor
  • ****
  • Join Date: Feb 2010
  • Posts: 366
  • Karma: 4
Re: Speaking of vibration
« Reply #105 on: 12.04. 2011 06:57 »
Trev,
If I had the dough and a withrdawn threat of divorce from the petticoat government over the prospect of a fourth bike entering my garage, I would! 

Cheers
Dave.
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

Offline Hubie

  • Dave Huybens
  • Valued Contributor
  • ****
  • Join Date: Feb 2010
  • Posts: 366
  • Karma: 4
Re: Speaking of vibration
« Reply #106 on: 03.05. 2011 05:25 »
Well the bottom end is back in the frame now and I finally have my new valves and guides so I can complete the rebuild.  Having not done valve replacement before, I can see that one pair are slightly smaller in diameter than the other pair.  Anyone able to tell me which are inlet and exhaust?  My guess would be the exhaust ones would be the slightly bigger.

Cheers,
Hubie
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

Online muskrat

  • Global Moderator
  • Wise & Enlightened
  • **
  • Join Date: Jul 2009
  • Posts: 8026
  • Karma: 106
  • Lake Conjola NSW Oz
    • Shoalhaven Classic Motorcycle Club Inc
Re: Speaking of vibration
« Reply #107 on: 03.05. 2011 06:15 »
G'day Hubie,
                 inlet are larger than exhaust. After the guides are put in give the valves a quick lap. If they don't make contact all the way round the seats will need to be re-cut. Most auto engineers can do that.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Online bsa-bill

  • Wise & Enlightened
  • *
  • Join Date: Mar 2006
  • Posts: 5342
  • Karma: 61
Re: Speaking of vibration
« Reply #108 on: 03.05. 2011 08:53 »
Hi Hubie

Muskrat's correct, I kind of thought along your lines until I rebuilt the Flash, then I came to the conclusion that if what gets sucked in gets burnt and converted to energy there would be less of it to get chucked out.

not so sure now about that stuff we got at school about not being able to destroy matter just change it, might help explain the big bang thing though ( all be it in reverse)
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 trevinoz

  • Newcastle, N.S.W. Australia.
  • Wise & Enlightened
  • *
  • Join Date: Jul 2006
  • Posts: 2849
  • Karma: 66
Re: Speaking of vibration
« Reply #109 on: 03.05. 2011 22:51 »
Hubie,
               When you replace guides it is advisable to have the seats cut as the guides may be slightly different to the old ones.
Engineering shops don't seem to lap valves these days. Grind the valves, cut the seats and vacuum test being the norm.

  Trev.

Offline Hubie

  • Dave Huybens
  • Valued Contributor
  • ****
  • Join Date: Feb 2010
  • Posts: 366
  • Karma: 4
Re: Speaking of vibration
« Reply #110 on: 04.05. 2011 01:28 »
Thanks Trev.  I have a place here that can do that for me.  I do want to get this right as the entire motor will be new this way and I should get alot of trouble free and fun riding out of it.

Cheers,
Hubie
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

Offline Hubie

  • Dave Huybens
  • Valued Contributor
  • ****
  • Join Date: Feb 2010
  • Posts: 366
  • Karma: 4
Re: Speaking of vibration
« Reply #111 on: 06.05. 2011 03:07 »
Bit more progress on the bike last night.  Got the 21 gearbox sprocket on, had enough play in the rear wheel alignment that I did not have to lengthen the rear chain either.  Whacked the clutch and primary on first to adjust my primary chain tension (much easier to do without the inner cover in the way!) and I plan on putting the timing side together tonight, Primary tomorrow.  Going to a mate's early next week to do the cylinder head and I can then do my final adjustments and get her up and running.  Slowly she goes.

Cheers,
Hubie.
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

Offline Hubie

  • Dave Huybens
  • Valued Contributor
  • ****
  • Join Date: Feb 2010
  • Posts: 366
  • Karma: 4
Re: Speaking of vibration
« Reply #112 on: 06.05. 2011 14:24 »
More progress made tonight.  Timing side back together and dynamo in.  Magneto will go on tomorrow followed by the primary side.  Getting nearer!
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

Offline trevinoz

  • Newcastle, N.S.W. Australia.
  • Wise & Enlightened
  • *
  • Join Date: Jul 2006
  • Posts: 2849
  • Karma: 66
Re: Speaking of vibration
« Reply #113 on: 07.05. 2011 01:17 »
Hubie,
               Time the magneto before you put the head back on.

  Trev.

Offline Hubie

  • Dave Huybens
  • Valued Contributor
  • ****
  • Join Date: Feb 2010
  • Posts: 366
  • Karma: 4
Re: Speaking of vibration
« Reply #114 on: 07.05. 2011 08:19 »
That's the plan Trev, can't get much more accurate than using a vernier with the head off.  I just need to know how to tell without the head on which side is on compression.  My guess would be looking at the pushrods, the ones low down on the cam would indicate the valves being closed.  Am I on the right track?
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

Online bsa-bill

  • Wise & Enlightened
  • *
  • Join Date: Mar 2006
  • Posts: 5342
  • Karma: 61
Re: Speaking of vibration
« Reply #115 on: 07.05. 2011 09:15 »
I'm not sure how much you have stripped down but if the timing case covers are off then IIRC when the timing marks line up the timingside  cylinder is on compression TDC.
I stand to be corrected though my memory being what it is.
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 trevinoz

  • Newcastle, N.S.W. Australia.
  • Wise & Enlightened
  • *
  • Join Date: Jul 2006
  • Posts: 2849
  • Karma: 66
Re: Speaking of vibration
« Reply #116 on: 08.05. 2011 00:20 »
Hubie,
             It doesn't really matter which side you time on as the only difference will be which lead goes to which cylinder.
Conventionally the rear pick-up feeds the left cylinder.
Having said that, you should check both sides and ensure that both fire at exactly the same degree of advance.
Use a degree disc after you find TDC.
If there is any discrepancy between cylinders, a little work on the cam ring with a fine grinding stone will fix it.
  Trev.

Offline Hubie

  • Dave Huybens
  • Valued Contributor
  • ****
  • Join Date: Feb 2010
  • Posts: 366
  • Karma: 4
Re: Speaking of vibration
« Reply #117 on: 10.05. 2011 06:40 »
Spent the day with Clive Carter and we did a cylinder head on a GN 250 plus installed the new valves and guides in the BSA head along with lapping them in.  The components now only need assembling and the bike will be running soon!

The end is in sight!!

Cheers,
Hubie.
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

Offline Hubie

  • Dave Huybens
  • Valued Contributor
  • ****
  • Join Date: Feb 2010
  • Posts: 366
  • Karma: 4
Re: Speaking of vibration
« Reply #118 on: 16.05. 2011 04:06 »
Barrels are now on and I've made some new inner primary gaskets.  With a bit more time, the primary will be on and I'll be almost there. Other work keeps intervening and preventing me from finishing the bike in one stint but at least I have two others to ride.

Cheers,
Hubie
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

Online bsa-bill

  • Wise & Enlightened
  • *
  • Join Date: Mar 2006
  • Posts: 5342
  • Karma: 61
Re: Speaking of vibration
« Reply #119 on: 16.05. 2011 09:42 »
I know the feeling Hubie
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