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Author Topic: Cb750k2 ngk dr8es-l, are these ok or to long?  (Read 1443 times)

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Offline ncstatecamp

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Cb750k2 ngk dr8es-l, are these ok or to long?
« on: August 15, 2014, 01:07:22 PM »
I'm trying to figure out a starting/running issue and am putting in new plugs. I'm getting mixed signals and references on what will fit and would like to make sure these aren't to long.
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Offline flybox1

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Re: Cb750k2 ngk dr8es-l, are these ok or to long?
« Reply #1 on: August 15, 2014, 01:18:07 PM »
NGK D8EA
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline ncstatecamp

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Re: Cb750k2 ngk dr8es-l, are these ok or to long?
« Reply #2 on: August 15, 2014, 01:30:06 PM »
I got that, but I saw somewhere on this forum that the -l was recommended for certain bikes but was discontinued or something
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Offline flybox1

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Re: Cb750k2 ngk dr8es-l, are these ok or to long?
« Reply #3 on: August 15, 2014, 02:00:49 PM »
the proper plugs are D8EA or denso X24ES-U

DR8ES-L
D=12mm
R = Resistor type  (you'll need different plug caps)
8=heart rating
E=19mm thread reach
S= standard 2.5mm electrode
-L =medium heat rating.

not the same plug, but the same thread reach...
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline 70CB750

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Re: Cb750k2 ngk dr8es-l, are these ok or to long?
« Reply #4 on: August 15, 2014, 02:28:45 PM »
I run D7s. First I had them for winter, but they work so well that I keep them year around.
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Offline PeWe

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Re: Cb750k2 ngk dr8es-l, are these ok or to long?
« Reply #5 on: August 15, 2014, 02:33:30 PM »
Here is a good thread about NGK DR8ES-L and the other plugs as well. http://forums.sohc4.net/index.php?topic=77832.0
No problem to use NGK DR8ES-L in a CB750. I used that plug during the 80's and this year too.

I bought several sets of them all:  NGK D8EA, NGK DR8ES-L and Denso X24ES-U.
Lucky for me that I bought several sets when I had carb tuning issues fouling plugs after plugs......
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline ncstatecamp

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Re: Cb750k2 ngk dr8es-l, are these ok or to long?
« Reply #6 on: August 15, 2014, 03:01:31 PM »
Well I also just moved to the Chicago area, from the south so I'm trying to figure out what I'll need different in regards to weather and traffic
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