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#79336 - 05/17/05 12:45 am Suppressed Spark Plug Caps  
Joined: Aug 2001
Posts: 315
cycarmark Offline
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cycarmark  Offline
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Posts: 315
florida
I've got a pair of Champion spark plug caps, the box they came in says "spark plug suppressed cover" and has part no. WCX 600. Will these work ok on a bike fitted with a Boyer ignition? And can anyone give a quick tutorial on what a "suppressed cover (cap)" is?

Thanks!

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#79337 - 05/17/05 1:31 am Re: Suppressed Spark Plug Caps  
Joined: Oct 2003
Posts: 11,108
RF Whatley Online content
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RF Whatley  Online Content
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Joined: Oct 2003
Posts: 11,108
North Georgia, USA
I don't think you want to use those, unless you're hearing spark noise on your motorcycle's radio. They have an internal resistor to knock down the spark voltage that you've so carefully propped up.


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
#79338 - 05/17/05 11:57 am Re: Suppressed Spark Plug Caps  
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LDBennett Offline
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LDBennett  Offline
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Posts: 319
Hesperia, CA
Ignition systems creat a spark that jumps the gap of the spark plug. A spark gap produce radio frequency interferrence (RFI), noise in the frequency spectrum of most radio communications including TV and radio braodcasts. Such RFI makes a car radio noisy and can effect TV viewers close to your path of travel. RFI can be surpressed without greatly effecting the actual spark by placing resistance in series with the high tension wiring of the ignition system. The automobile solution is to use one or more of three choices: resistor plugs that have an internal resistor between the top electrical connection and the spark plug tip, resistive spark plug connectors (commonly called spark plug caps) that have the resistor internal to the cap, or resistive wire which uses a carbon wire that has resistance end to end.

Boyers (except for the digital version) don't like any resistance in the high tension circuit. For that reason don't use any of those three options. Use non-resistor plugs, non-resistor spark plug caps, and hot rod non-resistive wires (Vintage dealers also sell non-resistive molded end cap wires). Since your bike probably doesn't have a radio you should be OK with this approach.

LDBennett

#79339 - 05/17/05 12:19 pm Re: Suppressed Spark Plug Caps  
Joined: Mar 2005
Posts: 9,965
John Healy Online content
John Healy  Online Content



Joined: Mar 2005
Posts: 9,965
Boston, Massachusetts
WCX 600
I believe these to be 8,000 ohms, and as such, would not be useful on a Boyer ignition. Boyer recommends using 5,000 ohms plug caps.
john


#79340 - 05/17/05 12:21 pm Re: Suppressed Spark Plug Caps  
Joined: Sep 2004
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Motorhead1957 Offline
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Motorhead1957  Offline
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Minnesota
So which is it then. Should we be using 5k resistance with Boyer or none?

Bob

#79341 - 05/17/05 12:27 pm Re: Suppressed Spark Plug Caps  
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cycarmark Offline
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cycarmark  Offline
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Posts: 315
florida
Thanks for the info, all. I guess I'll just keep using the old spark plug caps I have on the bike now. As far as the radio goes, I'll just keep listening to the beautiful music of the 650 Triumph engine!

#79342 - 05/17/05 2:25 pm Re: Suppressed Spark Plug Caps  
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Posts: 82
flatrack Offline
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flatrack  Offline
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Posts: 82
Arizona
Motorhead, Use zero resistance. I use to have a pair of spark plug wires that only had 250 ohms. They changed my bike from a 1 or 2 kick start to a 10 or 12

#79343 - 05/17/05 2:49 pm Re: Suppressed Spark Plug Caps  
Joined: Oct 2003
Posts: 11,108
RF Whatley Online content
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RF Whatley  Online Content
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Joined: Oct 2003
Posts: 11,108
North Georgia, USA
They'll look so nice on your coffee table.


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
#79344 - 05/17/05 2:53 pm Re: Suppressed Spark Plug Caps  
Joined: Mar 2005
Posts: 9,965
John Healy Online content
John Healy  Online Content



Joined: Mar 2005
Posts: 9,965
Boston, Massachusetts
Bob posted:
So which is it then. Should we be using 5k resistance with Boyer or none?

I new this question would come up as soon as I punched the Add Reply button.

In parts of the world you MUST use resistor caps as a part of the safety/annual inspection. This isn't to make your bike any safer or perform better. It keeps your RF from interrfering with other vehicles. You wouldn't want to bother the guy with the new Mercedes with your tick, tick, tick over his radio?...

As a practical matter you do not need to use resistor caps on the original (black box) MKIII Boyer. But you can if you want/or are required to. If the bike doesn't start, or is hard to start, you need, or will soon need, new coils.

Both the Micro-Digital (red box) and Micro-Power (blue box) require that you use 5,000 ohm resistor caps. In this case, the RF interference from your own ignition will cause your bike to miss-behave. It can even prevent the bike from starting in the first place.

Becasue typical resistor spark plug wires are fragile and break easily, Ernie Bransden recommends that you DO NOT use resistor spark plug wires.


#79345 - 05/17/05 3:28 pm Re: Suppressed Spark Plug Caps  
Joined: Aug 2001
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hh Offline
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hh  Offline
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Posts: 1,839
British Columbia
Quote:
You wouldn't want to bother the guy with the new Mercedes with your tick, tick, tick over his radio?
I'll bother him any possible way I can if it helps him realize I'm there and he's required to share the road with two-wheeled vehicles, but strangely that problem seems to be worst with Volvos. I have this theory that the worst possible drivers in the world buy Volvos because they're advertised as being so safe, and therefore not requiring any extraneous driver input (like not running bikes off the road :rolleyes: ) to ensure survival of their occupants.

Sorry for the rant. Back on topic: Another alternative for use with the digital Boyers is resistor spark plugs, but for some reason I don't trust them much more than resistor cable.


"Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin
#79346 - 05/19/05 7:26 pm Re: Suppressed Spark Plug Caps  
Joined: Jan 2005
Posts: 165
jackd Offline
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jackd  Offline
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Canada
Does anyone have a part number for these non-resistor plug wires? After reading this thread, I went out to check my not-so-easy starting T100C and found out that the bike had the resistor type(NGK P/N LB05FP 5K Ohms). I have already gone to the effort of putting in 6 volt coils with my MK III (black box) Boyer, and now I want to go the full route.

#79347 - 05/19/05 8:00 pm Re: Suppressed Spark Plug Caps  
Joined: Mar 2005
Posts: 9,965
John Healy Online content
John Healy  Online Content



Joined: Mar 2005
Posts: 9,965
Boston, Massachusetts
jackd
Mark Smith at British Cylcle Supply in Nova Scotia stocks Packard 440 solid core wire.

Or check around with your local hot rod shop for Packard 440 wire.
john beerchug


#79348 - 07/04/06 12:43 pm Re: Suppressed Spark Plug Caps  
Joined: Jan 2005
Posts: 86
Ron Trump Arbour Offline
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Ron Trump Arbour  Offline
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Joined: Jan 2005
Posts: 86
Herkimer, NY
My experience....I have a 1968 TR6c with original plug caps (Champion). They have a tendency to pop of the spark plug so I decided to remove the plug caps(NGK)from my 1982 GPZ 750 and replace the Triumph caps. Bad idea...the GPz caps are 5k ohm and I have the Boyer (Black box)ignition. Well everything was fine for the first 50 miles and then the bike began to hesitate then buck. I removed the plugs they were black sooted. Replaced with new plugs got about 30 miles out of those. Then replaced plugs again and made it home with just under 25 miles. I quickly took the NGK plug caps off the Triumph and put an order in for new unsuppressed caps. Mr. W. your correct the spark is suppressed with these caps. Lessons learned from this experience are that the black Boyer does not like suppressed(resistor) caps. See ya in Ohio!
Ron

#79349 - 07/04/06 1:11 pm Re: Suppressed Spark Plug Caps  
Joined: Dec 2004
Posts: 8,886
kommando Online content
kommando  Online Content


Joined: Dec 2004
Posts: 8,886
Scotland
I see the Volvo thing is universal, they do the same in the UK, they wait at a junction, see you coming and pull out just after the point of no return. They have a death wish but its not their death they are wishing for mad

#79350 - 07/04/06 1:16 pm Re: Suppressed Spark Plug Caps  
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Mr Mike Offline
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Mr Mike  Offline
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Posts: 3,871
Cape Carteret, NC
I use those old bright yellow solid wire Mallory ignition wires. Cut em to length and put em on. I bought a set for a V-8 and they will last out my lifetime.

Mr Mike

#79351 - 07/04/06 1:20 pm Re: Suppressed Spark Plug Caps  
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Doc in NC Offline
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Doc in NC  Offline
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Posts: 10
North Carolina, USA
Mr. Mike,

You didn't tell them how old you are!

Doc


'69 BSA Royal Star
'70 Tiger
'70 Bonnie
'72 BSA B25T
'74 Trident
'79 KZ 650
'00 Thunderbird (Hinkley)
#79352 - 07/04/06 11:33 pm Re: Suppressed Spark Plug Caps  
Joined: May 2006
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meriden4ever Offline
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meriden4ever  Offline
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London United Kingdom
From 1980, Meriden fitted these spark plug caps (made first by Lucas and then from 1982 by a German firm)to their home market bikes. US models had the rubber Champion leads until the end bigt


1983 TR65T Tiger Trail
1983 TSSAV
1983 TSX
1983 TR65 Thunderbird
1982 TR7T Tiger Trail
#79353 - 07/05/06 7:58 am Re: Suppressed Spark Plug Caps  
Joined: Oct 2004
Posts: 4,429
Tiger Offline
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Tiger  Offline
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Joined: Oct 2004
Posts: 4,429
Melbourne Australia
Not sure of Champion supressor caps but NGK cap at least can be easily converted.
Look up inside the cap and you will observe a screwdriver slot across the brass bit that clips to the plug, unscrew that and a spring and a supressor will fall out into your hand.
Replace spring and supressor with a square cut piece of silver solder or equivalent and you have "leaky" caps that will burn through the "front end" of a Volvo radio receiver.
The potplants who drive such vehicles pay extra for thick glass and other sound insulation so they can listen to Barry Manilow whilst they should be using that sense on the road.
I go straight around the glass and get their attention via the radio antenna.


1969 TR6R
7.62 x 51 is not a maths puzzle.
#79354 - 07/05/06 8:26 am Re: Suppressed Spark Plug Caps  
Joined: Apr 2006
Posts: 874
Tom D. 67 Bonny Offline
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Tom D. 67 Bonny  Offline
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Joined: Apr 2006
Posts: 874
Manchester, Connecticut, USA
Barry Manilow? That explains the glassy-eyed hypnotic stare, which could also explain the "I didn't see the motorcycle" common excuse! mad BTW, do the Brits have a July 4th across the pond? wink pint whisky


Tom D. 1967 T120R Bonneville
Anyone know of a place that sells Loctite
by the quart?
#79355 - 07/05/06 11:19 am Re: Suppressed Spark Plug Caps  
Joined: Aug 2001
Posts: 6,879
triton thrasher Online content
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triton thrasher  Online Content
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Joined: Aug 2001
Posts: 6,879
scotland
Quote:
BTW, do the Brits have a July 4th across the pond? wink pint whisky [/QB]
Yes, but nothing happens. We don't celebrate losing wars to you guys!


Amateur Loctite enthusiast.
#79356 - 07/05/06 11:56 am Re: Suppressed Spark Plug Caps  
Joined: Dec 2004
Posts: 8,886
kommando Online content
kommando  Online Content


Joined: Dec 2004
Posts: 8,886
Scotland
Over the years the 4th has started to figure in the form of BBQ's with Stars and Stripes themes and that wimpy American Football matches being held, but this year the Soccer World Cup has intervened sleep

#79357 - 07/05/06 12:07 pm Re: Suppressed Spark Plug Caps  
Joined: Jul 2002
Posts: 604
Tom_dup1 Offline
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Tom_dup1  Offline
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Posts: 604
England
We could celebrate August 24th 1814 and Major General Robert Ross's victory at Bladensburg and subsequent burning of Washington, but we don't. laugh
Thankfully we seem to have put all that behind us!

#79358 - 07/05/06 12:10 pm Re: Suppressed Spark Plug Caps  
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Posts: 3,399
gavin eisler Online content
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gavin eisler  Online Content
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argyll. scotland, uk
Before the new world was discovered we just went straight from the 3rd of july to the 5th. The 4th of july was stolen from the native Americans. True but terribly sad tale.
Cheers
Pod


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#79359 - 07/05/06 11:59 pm Re: Suppressed Spark Plug Caps  
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meriden4ever Offline
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meriden4ever  Offline
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London United Kingdom
Quote:
Originally posted by meriden4ever:
[ then from 1982 by a German firm)
That firm were Merit who also supplied the same for the Harris Bonnevilles
:rolleyes:


1983 TR65T Tiger Trail
1983 TSSAV
1983 TSX
1983 TR65 Thunderbird
1982 TR7T Tiger Trail

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