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Just a plug...

 
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thore
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PostPosted: Tue Aug 17, 2004 3:12 am    Post subject: Just a plug... Reply with quote

My 72 roadster was not running properly, no carb adjustments/vacuum gauge synchronization seemed to improve things. Ignition timing (Boyer) was good too. The bike would idle fairly OK and run fine from about 1/2 throttle and up. In between it was very rough, jumpy and downright unpleasant to ride.

Tried different plug NGK/Champion types - no improvement. Then I bought some Bosch Super 4 WR 56 plugs (with four electrodes) and it was like I had a new engine installed. Smoother than I ever thought possible - throughout the entire rpm range, idled at 7-800 and dead steady. Carb adjustment response was instant.

Of course this is too good to be true. So - have any of you out there ever tried these plugs, and what are the horror stories ?
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Jason Curtiss



Joined: 14 Jun 2003
Posts: 661
Location: HOUSTON, TEXAS

PostPosted: Tue Aug 17, 2004 4:03 am    Post subject: Reply with quote

Thore,

Your spark plug story does sound too good to be true. I suspect you have some hidden problem, as your 72 Commando should run perfectly fine with Champion N7Y spark plugs.

I have no experience with the Bosch plug you mentioned; however, as long as the reach and heat range are the same as the Champion, the Bosch plug should be OK to use in your Commando engine.

Regards,

Jason
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dynodave



Joined: 28 May 2003
Posts: 139
Location: USA

PostPosted: Tue Aug 17, 2004 5:33 am    Post subject: Reply with quote

Arrow

Last edited by dynodave on Mon Apr 11, 2005 5:12 pm; edited 1 time in total
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debby



Joined: 15 Apr 2004
Posts: 890
Location: Boulder, CO

PostPosted: Tue Aug 17, 2004 7:02 am    Post subject: Reply with quote

That's good to know. My bike had a voracious appetite for plugs when I was sorting through all the problems with the amals. Hopefully that's behind me now. Was worried that fouling plugs would continue to be a problem.

I took it out for a ride last night after work. Started first kick, ran great! I hope it stays that way for a while...

Debby
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Guest






PostPosted: Tue Aug 17, 2004 8:04 pm    Post subject: Reply with quote

Ah jeeze fella's, plugs smugs, I had the very same
esperience, no other brand or sytle of plug would allow
me to run my Combat if it even sat at a traffic light.
My signle carbed Combat became a delight and fast
and sure with the Bosch Plat 4's durring period I
did not know even where the points were located.

On Mid Ohio Trip Wesly's '71 was fouling plugs
horrorablely d/t worn rings with big gap to point
finaly would not run with his weak charging system
and boyer. We switched plugs and got back on
road and to place to sleep in bed instead on hwy.

Sure these plugs don't solve underlying problems but
boy howdy can they make it work darn well until
then. I'm hoping they will work with the supercharger
to fire a dense Hi comrpession mixture with their
buildt in wider than standard hook electrode heat range.
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Ron L



Joined: 27 Feb 2004
Posts: 1101
Location: Ohio

PostPosted: Wed Aug 18, 2004 3:20 am    Post subject: Reply with quote

Welcome Hobot, I'd recognize that writing style anywhere!
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norbsa48503



Joined: 07 Apr 2004
Posts: 995
Location: Flint, Michigan

PostPosted: Wed Aug 18, 2004 5:38 am    Post subject: Reply with quote

Plugs are fun I have been playing with mine and have found them to be useful once your close on the carbs. In third gear wind outs trying to get the bike to red line. Bosch Plat. WRP 7 100 mph than Auto lite AP63's 105 mph then AP 64 110 mph at 6500 rpm with my fat 240lb straight up in the wind. Now check to make sure that long runs on the x-way in fourth at 80mph and 4250rpm don't run too hot. They seem fine on my bike. So run as hot as you can sistain on the x-way at consant speed because that helps the most with all the other riding. I tryed the Bosch plat fours they were great down low really smooth but were braking up under high rpm's were life is exciting. norbsa
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thore
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PostPosted: Wed Aug 18, 2004 11:42 am    Post subject: super 4 plugs Reply with quote

My gut feeling leans towards dynodave`s opinion - it should run OK with the standard plugs. But - the Amals are brand new, as well as the ignition cables and plug caps. I had adjusted the throttles and the idle jet to my best knowledge, really taken care to make the best out of it.

But as I said, once the Super 4`s were in, everything just fell into place, even when the engine was started cold. I can understand that the effect of a hotter plug can be felt in a warm engine, but should it be so evident in a cold engine ?

When I feel brave, I`ll put the NGK`s back on and see if things change again. I`ll let you know..

Thanks for the replies !
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illf8ed



Joined: 30 Dec 2003
Posts: 472

PostPosted: Wed Aug 18, 2004 12:13 pm    Post subject: plugs Reply with quote

Thore,

Std for the combat engine is NGK BP7ES or Champion N7YC. NGK used to make a BP7EV platinum tip, the President of NGK US gave me a dozen of these in 1983. They work pretty well for low voltage applications.

The mid range uneveness is what I had before replacing the needle jets and jet needles on my combat. If you're Amals are new, make sure you have the right size needle jets (106).
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nortonfan



Joined: 24 Dec 2003
Posts: 362
Location: Brisbane, Australia

PostPosted: Thu Aug 19, 2004 7:25 pm    Post subject: Reply with quote

An interesting amal site for the bush/backyard mechanics.(That's me)
And anyone else who may wish to learn stuff.

http://www.hitchcocksmotorcycles.com/amal/mk1_conc_ht.html
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The Unapproachable Norton Commando

At the end of 1967 the Norton Commando was announced.

The Norton Commando was greeted with a certain amount of scepticism because on first sight the commando appeared to comprise of the old Norton Dominator twin cylinder engine mounted at an inclined angle in a set of new cylinder parts.

It was not realized that the new Norton Commando Isolastic method of engine suspension damped out all engine vibration and produced a machine which had uncanny smoothness for a vertical twin. In due course the critics were silenced and the Norton Commando had the distinction of being regarded as the first of todays so called superbikes. There can be little doubt that the original design concept of the Norton Commando has proved correct, since comparatively few modifications of any real consequence have been made since production commenced during 1968.

Now nearly 40 years later Norton Commando riders like us are a breed of our own, and as far as we are concerned its still more fun to go for a blat on the old Norton Commando, and fast. As a Norton Commando owner and enthusiast, my goal here is to promote and give credit to those who keep the Norton name going.

It is more deserving to give credit to the Commando itself, for after all these years it continues to be respected. The original Commando designers like John Favill are those who deserve the credit for developing this incredible motorcycle.

The Norton Commando Roadster and Interstate of the late seventies, never died. Although the Norton Villiers factory dispersed the tradition lived on. Today Kenny Dreer in the USA is developing the new 952 CC Norton. What a great looking bike this is, and its engineering is still based on the original layout. It will be interesting to see how the new 952CC Norton does in todays tough motorcycle market. One thing is for sure, I would own one if I could afford it.