run non-resistor spark plugs?

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kpke
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run non-resistor spark plugs?

#1 Post by kpke » Fri Jun 22, 2018 10:52 am

I am changing the spark plugs and caps on my thrasher bike. It's been a long time, but if it ain't broke why fix it? The caps were just resting on the plugs, so new ones are in hand.

In going through my inventory of spark plugs I found some non-resistor B8ES. I don't know where they came from.

What would happen if I ran these non-resistor plugs just to consume them?

Or shall I bin them?

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Yellow and Black RZ
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Re: run non-resistor spark plugs?

#2 Post by Yellow and Black RZ » Fri Jun 22, 2018 12:24 pm

Resistor type plugs are to eliminate/limit ignition noise.
'85 RRZ350 - Hacked.

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two-stroke-brit
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Re: run non-resistor spark plugs?

#3 Post by two-stroke-brit » Fri Jun 22, 2018 1:40 pm

it might interfere with a vapor style digital speedo doodad.
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T.RexRacing
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Re: run non-resistor spark plugs?

#4 Post by T.RexRacing » Fri Jun 22, 2018 1:56 pm

You can run them as long as the resistor cap's resistance alone (5K Ω) is sufficient for the ignition but you will gain nothing.
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bitzz
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Re: run non-resistor spark plugs?

#5 Post by bitzz » Fri Jun 22, 2018 2:00 pm

You want a resistor... somewhere.
The resistor makes the spark hotter and the spark duration longer.

... and the resistor eliminates electronic "noise" that can screw with electronic devices.

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Re: run non-resistor spark plugs?

#6 Post by MK » Fri Jun 22, 2018 3:47 pm

List of things that I got into issues due to EMV (caused for example by using B type plugs):
- Digital water temperature gauge
- Zeeltronic VCDI
- Ignitech DC CDI P2
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kpke
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Re: run non-resistor spark plugs?

#7 Post by kpke » Fri Jun 22, 2018 5:32 pm

Thanks for the replies!

The bike I would put these in has a bicycle speedometer (works but freaks out at about 60 mph), LC mechanical tach, the blinkers don't flash, etc.

The caps I bought are resistor caps so I will give the plugs a try.

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Re: run non-resistor spark plugs?

#8 Post by hondaror » Sat Jun 23, 2018 4:13 am

They should work just fine.
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kpke
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Re: run non-resistor spark plugs?

#9 Post by kpke » Tue Jul 03, 2018 9:57 am

All was good on a 100 mile ride last Sunday :smt004

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Re: run non-resistor spark plugs?

#10 Post by hondaror » Tue Jul 03, 2018 5:27 pm

I remember first hearing about the resister plugs when I was quite young. They were for less radio wave interference. Now they minimize computer interference on board.
Rory
2 1984 RZ350s
1985 RZ350
9 1986-1990 RZ350s
2000 ST2
2005 749
2005 749 with 999 engine

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