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Dirt Bike Mods & Maintenance
plug getting loose
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[QUOTE="Rich Rohrich, post: 652725, member: 16241"] That advice from Clymer is essentially correct. Here's what NGK has to say about installation on their website ([url]www.ngksparkplugs.com[/url] ) : [i]1. Installing spark plugs Torque is one of the most critical aspects of spark plug installation. Torque directly affects the spark plugs' ability to transfer heat out of the combustion chamber. A spark plug that is under-torqued will not be fully seated on the cylinder head, hence heat transfer will be slowed. This will tend to elevate combustion chamber temperatures to unsafe levels, and pre-ignition and detonation will usually follow. Serious engine damage is not far behind. An over-torqued spark plug can suffer from severe stress to the Metal Shell which in turn can distort the spark plug's inner gas seals or even cause a hairline fracture to the spark plug's insulator...in either case, heat transfer can again be slowed and the above mentioned conditions can occur. The spark plug holes must always be cleaned prior to installation, otherwise you may be torquing against dirt or debris and the spark plug may actually end up under-torqued, even though your torque wrench says otherwise. Of course, you should only install spark plugs in a cool engine, because metal expands when its hot and installation may prove difficult. Proper torque specs are listed below. Spark plug Flat seat type (with gasket) 14 ø mm Aluminum Cylinder Head 18.0~21.6 (lb-ft.) [/i] Here's the link to the excellent NGK spark plug basic tech info. [url]http://www.ngksparkplugs.com/techinfo/spark_plugs/techtips.asp?nav=31000&country=[/url] The point is it's VERY EASY to over-torque a spark plug and destroy the threads in the cylinder head, or destroy the seal of the washer, so be careful about cranking it down too much. It's worth setting your torque wrench to the spec listed above and tighten a few easy to reach bolts till you get a good feel for how that torque feels. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
plug getting loose
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