Anyone have lead on finding NGK9 plugs, Seems to have disappeared from face of earth. Rock Auto has 3, I bought 100 did not realize had R in them and restrictor plugs until few months later. Will sale those if anyone needs.Did find few on ebaY AND ONE FOR 100 BUCKS.

B9es anywhere that not stupid priced?

This message has been edited. Last edited by: wideopen231,

Chris, check a Sea Doo dealer. That is a common plug for Water Craft.

superseded to 5422 NGK

Are you looking for NGK 5238 which is a R5671A9 ?

NGK 2411 is B8ES

looking for 2611 b9es. got to start wearing glass' when typing.

Do not want restrictor plugs with magneto. I have about 90 of those I want to get rid of. When ordered from rock auto should have been wearing glass' too. LOL
I have enough for few runs since not swapping out every run but also need new plug or two for reading fuel. Could probably get by with 24 new ones for while.

I have some 10's for A/fuel and do not mind running them but would like my old stand by 9's then change. Told very little difference but if possible remove all doubt.

Twice last year had plugs and stop nozzle throw me curve ball and just going to what I know to start season.

I got lost trying to cross numbers to NGK and called their technical help line, got a VERY knowledgeable and helpful young lady who got me straight.

Wideopen
the R5671A9 is NOT a resistor plug, the "R" stands for RACE.

https://www.rockauto.com/en/mo...optionchoice=0-0-0-1

quote:

Originally posted by sr4440:
Wideopen
the R5671A9 is NOT a resistor plug, the "R" stands for RACE.

https://www.rockauto.com/en/mo...optionchoice=0-0-0-1

As per NGK's own website, the R absolutely stands for resistor.
https://www.ngk.com/ngk-spark-plug-numbering-systems

Resistor
No
Resistor Value
1K Ohm
Heat Range
9
Features
Copper gasket
Torque Specs
Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.
Part Information
found this in more than one location

i would be happy to pay a dollar a piece for those if they were 10's lol

A typical resistor spark plug usually has a resistance value between 5,000 ohms (5kΩ) and 10,000 ohms (10kΩ), though the exact value can vary depending on the manufacturer and specific spark plug design; this resistance is built into the ceramic body of the plug to suppress radio frequency interference (RFI) generated by the spark ignition process.
the ngk is 1000 ohms

quote:

Originally posted by sr4440:

the R5671A9 is NOT a resistor plug, the "R" stands for RACE.

https://www.rockauto.com/en/mo...optionchoice=0-0-0-1

This is correct. For all the non-believers, using your multimeter set to ohms, measure from the spark plug boot end to the projection tip and you’ll measure less than 1 ohm Guaranteed.

quote:

Originally posted by rusty:
Resistor
No
Resistor Value
1K Ohm
Heat Range
9
Features
Copper gasket
Torque Specs
Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.
Part Information
found this in more than one location

Rusty

the plugs have 1 ohm not 1000 ohms.

Joe

NGK Part Numbering is completely different for their racing plugs. Yes, their standard grocery getter plugs that have an R in the P/N are resistor plugs. The Race plugs (P/N BEGINS with an R) are non-resistor, and as others mentioned, will measure about 1 Ohm or less.
NGK Racing R5671A-9

thanks misread it

My apologies to SR4440... didn't realize the race plugs are numbered differently.

quote:

Originally posted by BD104X:
My apologies to SR4440... didn't realize the race plugs are numbered differently.

No need to, I like open discussions, it's one of the ways I learn.

Joe

OMG. It is SO much better in here these days! Take care. Tom Worthington

The ngk 5671A-9 is .75 depth , ⅝ hex , 14mm thread..... 9 is heat range
Same # with last number from 7 to 11 is heat ranges , 7-hottest/11 coldest

Has anyone here used the Autolite AR 3933 Racing Spark plug vs the NGK R5671A-9 #5238? Opinions?