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Author Topic:   Sparkplug Temperature Selection
JDH posted 07-22-2002 05:04 PM ET (US)   Profile for JDH   Send Email to JDH  
Hi -

I noticed this weekend that the recommended plug for my Suzuki DT-75 is an NGK F8HS. T


The plus that are in there are a FR7HS. I stopped by a marine store to see what the diifference is, and the NGK book says that they go from a 10 to 2 Cold -> Hot.

IOW, the PO of my boat stepped up a notch and put in a hotter plug. This used to a fairly common thing in cars, but I a not a 2 stroke wizard. Why would someone do it? Benefits? Potential downside? Any downside to adding the R resistor plugs?

I am going to swap the plugs out, and need to decide what to do.

TIA,

Jim

DJS posted 07-23-2002 04:35 PM ET (US)     Profile for DJS  Send Email to DJS     
JDH,

Go to this site. They have a lot of information on their plugs, and you may contact them with your question.

www.ngksparkplugs.com/products/marine

Hope this helps. David

newt posted 07-23-2002 05:08 PM ET (US)     Profile for newt  Send Email to newt     
JDH,

While I am no expert on outboards, I can tell you in general that different plugs are for different operating styles.

On my old Yamaha RZ350, I had two choices in heat ranges. I usually ran the cooler plug because I tended to run the engine at high rpms wherever I went (that bike had a very narrow power band, and I was younger and reckless). The downside to running cooler plugs is that they had a tendancy to foul more easily when idled or run at low rpms.

I assume that the principle is the same for boats, but am interested in what others have to say about it.

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