BMW K bikes (Bricks)

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1Back to top Go down    plug type on Tue 14 Feb 2017 - 3:34

BIG D

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Cool

Has anyone tried Iridium type plugs on a K motor, are they beneficial in any way? or are they best avoided on an old K lump, just curious if they help in any way justifying their cost.

D

    

2Back to top Go down    Re: plug type on Tue 14 Feb 2017 - 4:33

BobT

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If you get yourself a pot of petrol and air, squash it to about 10:1 and then throw a match into it, I will guarantee that it will explode. The same will happen if you put a spark from a plug into it. Normal plugs work fine for most of us and the power for the spark at that plug is determines by the voltage in the plug lead. The power output from the engine is determined but the amount of fuel and air in there.
A different plug will make no difference to the bike.

    

3Back to top Go down    Re: plug type on Tue 14 Feb 2017 - 4:53

92KK 84WW Olaf


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Pity the poor guy with the Mercedes V12. Twin spark. Then he finds the rear cylinders are buried under the bulk head.

So 24 iridium plugs needs a mortgage because only the main dealer will fit all 24 but they are supposed to last 50,000 miles I think.

For the K NGK D7EA seem to be the business for a fraction of the price........and put the rest in the beer fund.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 84,100 miles
    

4Back to top Go down    Re: plug type on Tue 14 Feb 2017 - 9:01

sidecar paul

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They are useful for V twins with a magneto since they fire at about 5000 volts less than a standard plug.

Now, I wonder who uses a 50º V twin?

Paul.


__________________________________________________
'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

5Back to top Go down    Re: plug type on Tue 14 Feb 2017 - 9:27

BobT

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sidecar paul wrote:They are useful for V twins with a magneto since they fire at about 5000 volts less than a standard plug.

Now, I wonder who uses a 50º V twin?

Paul.
So does a normal plug with a smaller gap.

    

6Back to top Go down    Re: plug type on Tue 14 Feb 2017 - 9:50

92KK 84WW Olaf


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sidecar paul wrote:They are useful for V twins with a magneto since they fire at about 5000 volts less than a standard plug.

Now, I wonder who uses a 50º V twin?

Paul.

Farmer in the field behind me has some Deere traction that uses those 50 degree engines.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 84,100 miles
    

7Back to top Go down    Re: plug type on Tue 14 Feb 2017 - 10:06

RicK G

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I really don't see the need for platinum/iridium/unobtainimum plugs as the NGK D7EAs work very well and last a long time.
I saw a D8EA virtually without an outer electrode and it was still firing because of the CDI ignition where a conventional points/coil ignition would have had no chance bridging that gap.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

8Back to top Go down    Re: plug type on Tue 14 Feb 2017 - 13:31

Brad-Man

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I use 'm on my two stroke Yamaha RD's - they don't foul when caught in traffic for long periods...and I have to go slow.


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Toys don't make the man - Man makes the toys....
    

9Back to top Go down    Re: plug type on Tue 14 Feb 2017 - 15:21

BIG D

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Cool

Thanks gents food for thought, I have no problems with using NGK's just wondering that's all.

D

    

10Back to top Go down    Re: plug type on Tue 14 Feb 2017 - 15:57

indian036

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A lot of transverse V6 car engines (e.g. Mitsubishi Magna in Oz) use them in the back bank because of their lifespan. You have to remove much of the intake system to change plugs, so with these you don't have to do it as often. They use ordinary plugs on the easily accessible front bank. 

Bill


__________________________________________________
1985 K100RT Red.  VIN 0028991K100RT    ENG 104EA248523386
1985 K100RT Blue. VIN 0029036K100RT    ENG 104EA25852071
1990 K100LT Black. VIN WB105060310190452
1984 K100RT White. VIN. 0023022K100RT  ENG 104EA32848523
    

11Back to top Go down    Re: plug type on Tue 14 Feb 2017 - 23:56

Point-Seven-five

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In the mid 80's in the U.S. EPA regulations came into effect mandating that auto engines run for 100,000 miles without maintenance and still meet fuel economy and emissions requirements.  That meant that items like spark plugs be capable of over 3,000 hours of operation with no degradation in performance.

Rare earth elements like palladium, iridium, and platinum are used to reduce the electrode erosion that causes poor ignition.  I have had cars where the plugs lasted nearly 200,000 miles with no loss of performance. 

Since dealers' business plans relied on tuneups as a major source of cash flow, it should be easy to see why the manufacturers kept the 100,000 mile requirement under wraps for as long as possible.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

12Back to top Go down    Re: plug type on Wed 15 Feb 2017 - 8:13

flea

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tried using iridium plugs in both my paiggio mp3 250 and my yam xs 650 , got very few miles (couple of hundred kls ) on both before having to swap back to the original plugs , the xs650 had a rebuilt motor and the mp3 had only 8000 kls on new bike . original rated plugs back in and both running very well still.. don't know why as a lot of people swear by the irridum plugs , but this is my experience ( same as the mp3 seems happier running on standard unleaded petrol rather than ultra where the xs 650 is happy with either )

    

13Back to top Go down    Re: plug type on Thu 16 Feb 2017 - 20:51

nods

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Had iridium's as standard equipment in my '89 Toyota Corolla that did half a million km's.  I replaced the plugs every 100,000 km's and they looked fine.  Now I'm using them in my Triumph 1050, but have only covered 20,000 km's with them.

For my K, when I eventually get it running one day, it looks like the $2.50 NGK's will be the go!


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Chassis number0025951
Vehicle code0504
SeriesK589
ModelK 100 RT 84 (0504 ( 0505 )
Body typeK 100 RT 84 (0504
Catalog modelECE
Production date1985 / 01
Engine0514)
Transmission
Steering
CatalyzerNONE
    

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