BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
JWood Auctions JRC Engineering dealers JWood Auctions
Home | Sponsors, Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons, "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Member Spotlight
Soup Dragon
Soup Dragon
South Cotswolds, England
Posts: 21
Joined: October 2006
Show All Member Profiles 
Shout Box
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Who's Online Now
19 registered members (Alan_nc), 193 guests, and 435 spiders.
Key: Admin, Global Mod, Mod
Newest Members
Konaflyer, Begbie, Andrew Fallo, Zack Banks, 1966g10
10418 Registered Users
Top Posters(30 Days)
btour 89
Rohan 81
Triless 77
reverb 75
Popular Topics(Views)
710,228 mail-order LSR
Forum Statistics
Forums34
Topics68,305
Posts665,025
Members10,418
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Previous Thread
Next Thread
Print Thread
Rate Thread
Suppressed Spark Plug Caps #79336
05/17/05 12:45 am
05/17/05 12:45 am
Joined: Aug 2001
Posts: 332
florida
C
cycarmark Offline OP
BritBike Forum member
cycarmark  Offline OP
BritBike Forum member
C

Joined: Aug 2001
Posts: 332
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!

Support Your #1 BritBike Forum!

Check out British motorcycles for sale:
British Motorcycles on e-Bay UK, British motorcycles on e-Bay North America
Check out British motorcycles for sale:
British Motorcycles on e-Bay UK, British motorcycles on e-Bay North America
Re: Suppressed Spark Plug Caps #79337
05/17/05 1:31 am
05/17/05 1:31 am
Joined: Oct 2003
Posts: 11,267
North Georgia, USA
RF Whatley Offline
BritBike Forum member
RF Whatley  Offline
BritBike Forum member

Joined: Oct 2003
Posts: 11,267
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
Re: Suppressed Spark Plug Caps #79338
05/17/05 11:57 am
05/17/05 11:57 am
Joined: Aug 2001
Posts: 319
Hesperia, CA
L
LDBennett Offline
BritBike Forum member
LDBennett  Offline
BritBike Forum member
L

Joined: Aug 2001
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

Re: Suppressed Spark Plug Caps #79339
05/17/05 12:19 pm
05/17/05 12:19 pm
Joined: Mar 2005
Posts: 10,221
Boston, Massachusetts
J
John Healy Offline

BritBike Forum member
John Healy  Offline

BritBike Forum member
J

Joined: Mar 2005
Posts: 10,221
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


Re: Suppressed Spark Plug Caps #79340
05/17/05 12:21 pm
05/17/05 12:21 pm
Joined: Sep 2004
Posts: 9
Minnesota
M
Motorhead1957 Offline
BritBike Forum
Motorhead1957  Offline
BritBike Forum
M

Joined: Sep 2004
Posts: 9
Minnesota
So which is it then. Should we be using 5k resistance with Boyer or none?

Bob

Re: Suppressed Spark Plug Caps #79341
05/17/05 12:27 pm
05/17/05 12:27 pm
Joined: Aug 2001
Posts: 332
florida
C
cycarmark Offline OP
BritBike Forum member
cycarmark  Offline OP
BritBike Forum member
C

Joined: Aug 2001
Posts: 332
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!

Re: Suppressed Spark Plug Caps #79342
05/17/05 2:25 pm
05/17/05 2:25 pm
Joined: Aug 2004
Posts: 82
Arizona
F
flatrack Offline
BritBike Forum
flatrack  Offline
BritBike Forum
F

Joined: Aug 2004
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

Re: Suppressed Spark Plug Caps #79343
05/17/05 2:49 pm
05/17/05 2:49 pm
Joined: Oct 2003
Posts: 11,267
North Georgia, USA
RF Whatley Offline
BritBike Forum member
RF Whatley  Offline
BritBike Forum member

Joined: Oct 2003
Posts: 11,267
North Georgia, USA
They'll look so nice on your coffee table.


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

RF Whatley
Cornelia, GA
Re: Suppressed Spark Plug Caps #79344
05/17/05 2:53 pm
05/17/05 2:53 pm
Joined: Mar 2005
Posts: 10,221
Boston, Massachusetts
J
John Healy Offline

BritBike Forum member
John Healy  Offline

BritBike Forum member
J

Joined: Mar 2005
Posts: 10,221
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.


Re: Suppressed Spark Plug Caps #79345
05/17/05 3:28 pm
05/17/05 3:28 pm
Joined: Aug 2001
Posts: 1,839
British Columbia
hh Offline
BritBike Forum member
hh  Offline
BritBike Forum member

Joined: Aug 2001
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
Re: Suppressed Spark Plug Caps #79346
05/19/05 7:26 pm
05/19/05 7:26 pm
Joined: Jan 2005
Posts: 165
Canada
J
jackd Offline
BritBike Forum member
jackd  Offline
BritBike Forum member
J

Joined: Jan 2005
Posts: 165
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.

Re: Suppressed Spark Plug Caps #79347
05/19/05 8:00 pm
05/19/05 8:00 pm
Joined: Mar 2005
Posts: 10,221
Boston, Massachusetts
J
John Healy Offline

BritBike Forum member
John Healy  Offline

BritBike Forum member
J

Joined: Mar 2005
Posts: 10,221
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


Re: Suppressed Spark Plug Caps #79348
07/04/06 12:43 pm
07/04/06 12:43 pm
Joined: Jan 2005
Posts: 86
Herkimer, NY
Ron Trump Arbour Offline
Life member
Ron Trump Arbour  Offline
Life member

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

Re: Suppressed Spark Plug Caps #79349
07/04/06 1:11 pm
07/04/06 1:11 pm
Joined: Dec 2004
Posts: 9,551
Scotland
kommando Online content
BritBike Forum member
kommando  Online Content
BritBike Forum member

Joined: Dec 2004
Posts: 9,551
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

Re: Suppressed Spark Plug Caps #79350
07/04/06 1:16 pm
07/04/06 1:16 pm
Joined: Aug 2001
Posts: 3,884
Cape Carteret, NC
M
Mr Mike Offline
BritBike Forum member
Mr Mike  Offline
BritBike Forum member
M

Joined: Aug 2001
Posts: 3,884
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

Re: Suppressed Spark Plug Caps #79351
07/04/06 1:20 pm
07/04/06 1:20 pm
Joined: Apr 2002
Posts: 10
North Carolina, USA
Doc in NC Offline
BritBike Forum
Doc in NC  Offline
BritBike Forum

Joined: Apr 2002
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)
Re: Suppressed Spark Plug Caps #79352
07/04/06 11:33 pm
07/04/06 11:33 pm
Joined: May 2006
Posts: 2,610
London United Kingdom
meriden4ever Online content
BritBike Forum member
meriden4ever  Online Content
BritBike Forum member

Joined: May 2006
Posts: 2,610
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
Re: Suppressed Spark Plug Caps #79353
07/05/06 7:58 am
07/05/06 7:58 am
Joined: Oct 2004
Posts: 4,429
Melbourne Australia
Tiger Offline
BritBike Forum member
Tiger  Offline
BritBike Forum member

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.
Re: Suppressed Spark Plug Caps #79354
07/05/06 8:26 am
07/05/06 8:26 am
Joined: Apr 2006
Posts: 874
Manchester, Connecticut, USA
Tom D. 67 Bonny Offline
BritBike Forum member
Tom D. 67 Bonny  Offline
BritBike Forum member

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?
Re: Suppressed Spark Plug Caps #79355
07/05/06 11:19 am
07/05/06 11:19 am
Joined: Aug 2001
Posts: 7,602
scotland
triton thrasher Offline
BritBike Forum member
triton thrasher  Offline
BritBike Forum member

Joined: Aug 2001
Posts: 7,602
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.
Re: Suppressed Spark Plug Caps #79356
07/05/06 11:56 am
07/05/06 11:56 am
Joined: Dec 2004
Posts: 9,551
Scotland
kommando Online content
BritBike Forum member
kommando  Online Content
BritBike Forum member

Joined: Dec 2004
Posts: 9,551
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

Re: Suppressed Spark Plug Caps #79357
07/05/06 12:07 pm
07/05/06 12:07 pm
Joined: Jul 2002
Posts: 604
England
Tom_dup1 Offline
BritBike Forum member
Tom_dup1  Offline
BritBike Forum member

Joined: Jul 2002
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!

Re: Suppressed Spark Plug Caps #79358
07/05/06 12:10 pm
07/05/06 12:10 pm
Joined: Aug 2001
Posts: 4,113
argyll. scotland, uk
gavin eisler Offline
BritBike Forum member
gavin eisler  Offline
BritBike Forum member

Joined: Aug 2001
Posts: 4,113
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
Re: Suppressed Spark Plug Caps #79359
07/05/06 11:59 pm
07/05/06 11:59 pm
Joined: May 2006
Posts: 2,610
London United Kingdom
meriden4ever Online content
BritBike Forum member
meriden4ever  Online Content
BritBike Forum member

Joined: May 2006
Posts: 2,610
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

Moderated by  John Healy 


Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.6.2