Author Topic: Speaking of vibration  (Read 13752 times)

Online Brian

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Re: Speaking of vibration
« Reply #135 on: 19.05. 2011 03:50 »
With the plugs Hubie your Champions are equivalent to a NGK B6HS which is right for your bike. You can go one range colder to a B7HS. With NGK plugs the higher the number the colder the plug.

I run B7HS in all my BSA twins but I live in the country so all my riding is at highway speeds. If I lived in a city or did more rallies at slower speeds etc I would use B6HS, they are less prone to fouling than the B7HS's

You can also use BP6HS or BP7HS which are the same except they have protuding tips. There have been millions of articles written about the pro's and con's of protuding tip plugs so I wont go into that area.

I have a concentric on my plunger Flash, it has the needle in the middle groove and a 240 main jet. I modified mine so it has a changeable pilot jet but thats another story.

Offline Hubie

  • Dave Huybens
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Re: Speaking of vibration
« Reply #136 on: 19.05. 2011 08:42 »
I've taken her for a quick run around the block since fettling the carb.  No smoke, no hesitiation.  Just very smooth, it goes fantastic and starts well.  Cant wait to see what she's like when she's run in.  Only a little throttle opening produces some very rapid movement.  I just love these BSA's  *respect*
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 A10Boy

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Re: Speaking of vibration
« Reply #137 on: 19.05. 2011 09:00 »
Its no surprise that your Champion plugs fouled up so quickly. Thanks to our modern "petrol" if the plugs get wet from a rich mixture and cold engine scenario they wont work. I had this on my own flash. I went to the hotter NGK B6 and the problem stopped. The B7's were prone to failure a few seconds after start up while the engine was warming up. You have 8.5:1 compression, you might need B7's it depends how it runs.

People often think that the new plugs are faulty, they probably aren't until wetted then its game over.

Good thread BTW. well done.
Regards

Andy

1960 A10 - Black Golden Flash
Plus
1974 Kawasaki Z1a
Yam XJR 1300

Online muskrat

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Re: Speaking of vibration
« Reply #138 on: 19.05. 2011 10:06 »
I had been told that you should run the coldest plug you can without fouling. I run B7ES in the '51 (alloy head) and B8ES looking at B9ES for the cafe.
I once had a '69 Monty GPMX360 and used a 5 to warm up then changed to a 9 to race.
Hubie, I can see your smile from here.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Offline Hubie

  • Dave Huybens
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Re: Speaking of vibration
« Reply #139 on: 20.05. 2011 09:30 »
G'day all, I have uploaded a quick and average quality video of the flash up and running finally.  Sorry for the quality but there will be more and better footage to come.  Enjoy! 

http://www.youtube.com/watch?v=dFuC7SP1Iq4

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 terryk

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Re: Speaking of vibration
« Reply #140 on: 20.05. 2011 14:32 »
Good on ya Dave enjoy it. I look forward to riding my old 1947 A7 everyday I never get sick of it. I just waste fuel riding until the sun goes down.
cheers Terry
1950-53 A10 rigid/plungers, 1958-61 A10 super rockets, 1947-50 A7 longstrokes, 1949 Star twin,
1951-54 A7 plungers, 1940s M21, WDM20s,
1948-50s B33s rigid/plunger/swingarm, 1948-50s b31s rigid/plunger/swingarm