Question about 2008 Harley Davidson FLHRC Road King Classic

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2008 FLHRI, what spark plug numbers for the different brands would work in my bike? Would even like to go to a little hotter plug if possible.

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You would be best to stick with the factory stock plugs. A hotter plug will make the engine run physically hotter, not "hotter" as in "faster." Only go to a hotter plug if reading the current plugs indicates the need.

Posted on Jun 26, 2009

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I have a polaris 600 which i cannot seem to keep spark plugs. On a good day maybe every 100km and the plug blows. i have tried different brands but no different. It is a new machine and have had it b


If your plugs are fouling the plug is not the problem. your carburetor setting are to rich. secondly if you run a hotter plug it will help stop the problem. another thing I found out was that the helps is to let off the choke as soon as possible. running with choke on to long only fouls plugs

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A blackened spark plug is a sign of a rich air/fuel ratio or a misfiring plug. You stated that you changed the coil and wires, but did you change the plugs? Spark plugs, even new ones, can, and do, go bad (excessive internal resistance). Make sure that the plugs are also the correct part number for your application, as they could be of the wrong heat range for your bike. I have even heard of guys using a colder plug in the rear cylinder and a hotter plug in the front cylinder because the front cylinder tends to run a little cooler than the rear (increased air flow in the front).

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1 Answer

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Very critical, if the plug is the wrong reach and hotter or colder than specified the bike's performance will be affected. I would suggest getting an iridium plug of the correct heat range for your Harley D. Your user manual or local stockist will tell you the normal plug to use for your bike. The manual will if applicable list plugs of different heat ranges to cater for engine mods etc. A point to take note of: - plugs by different manufacturers are specific to themselves. No 2 brands of plug are the same. Similar they maybe but not identical, and this is where you can go wrong. Also you cannot mix plug brands or types. Hope this helps

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1 Answer

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Take out one or both of the spark plugs and see what they look like. If they are sooty or dark black and possibly smell like gasoline, then you have a spark issue. Might need to replace the plugs, or the coil or the CDI. It could even be a battery starting to go bad.
If the plugs are a light tannish or brown color that the spark is most likely fine and you have a gas supply issue. Make sure the supply line to the carb/fuel injection pump is open. If that is fine you might have either a plugged jet or passage way in your carb if your bike is the FLHR or maybe a bad fuel injector or something going on ther if you have th FLHRI.

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1 Answer

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The numbers 4 and 8 are heat ratings. The lower numbers run hotter. Different heat ratings allow you to choose the best compromise between keeping the plug from fouling and making the electrode last longer. If your plugs tend to foul, you need a hotter plug. If they tend to fry away, you need a cooler one. As engines get old, they tend to need hotter plugs. The differences in the heat ratings can be seen in subtle differences in the dimensions of the electrode (usually the center one) and the little insulator around the center electrode. The dimensional changes effect the heat transfer characteristics of the plugs, which changes how effectively the high temperatures present at the spark are conducted away. Besides the heat rating of the plug, the other big factor is having a nice clean thread surface in the engine block, which is why some mechanics will use a thread chaser when changing plugs. Here's a link to NGK's numbering meanings
http://www.ngk.com/sparkplug411_manufacturer.asp?manufacturerID=1
I hope you found this helpful.

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1 Answer

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only a handful will work with the motorcycle engine you own. Also different brands (NGK, Bosch, DENSO, Champion, Esc) will work better on different types of engines. As a general rule of thumb, use the sparkplug your manufacturer recommends for your motorcycle (same brand and part number). Unfortunately some spark plugs are very specific to a type of engine and make only for that engine such as the NGK ME8 for $34 per sparkplug, compared to the normal price of $3 per sparkplug.

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1 Answer

How to choose the right spark plug for my bike?


only a handful will work with the motorcycle engine you own. Also different brands (NGK, Bosch, DENSO, Champion, Esc) will work better on different types of engines. As a general rule of thumb, use the sparkplug your manufacturer recommends for your motorcycle (same brand and part number). Unfortunately some spark plugs are very specific to a type of engine and make only for that engine such as the NGK ME8 for $34 per sparkplug, compared to the normal price of $3 per sparkplug.

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1 Answer

How to choose the right spark plug for my bike?


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