See full version: Thin-wall spark plug wrench for Yamaha
You can buy a cheap little tool that is made for motorcycle engines but it isn't a socket that can mount on a ratchet. or you can get a
Blackhawk, Snap-On, Matco, or other high quality socket that uses better steel and doesn't have to be so thick to be strong. you'll find lots of applications on Yamaha's that require better tools to get clearance.
Re: Thin-wall spark plug wrench for Yamaha? here
I have an '06 50hp 2-stroke and I use a craftsmen socket. not sure if you've tried one of theirs? Even if you have to buy a $30 snap-on socket, it'd be the last one you ever have to buy atleast! here
Insulator - The central electrode that runs from the terminal connector to the base of the spark plug is surrounded by an aluminum oxide ceramic like the upper portion of the plug's shell but is not glazed. A longer insulator may protrude past the base of the metal shell but must be short enough to avoid contact with the top of the engine's piston. The length of the insulator and the metal conductor core help determine a plug's heat range. here
There has always been historical disagreement as to the inventor (Edward Berger versus Sir Oliver Lodge) and date that the first electric plug was used to spark the air/fuel mixture in an internal combustion piston engine. What we do know is the U.S. Patent office began issuing patents to protect a variety of ignition products in the late 1800s. Among the early engineers seeking protection for their ideas was Nikola Tesla for his ignition timing system. The early plugs relied on magneto-based ignition wires to provide the electrical flow that a plug requires to do its job. For the majority of vehicles on the road today, an ignition coil rather than a magneto is used to amplify the voltage traveling through an engine's ignition wires. However, both provide an effective high-voltage electrical spark. Once the voltage created by a magneto or ignition coil exceeds the dielectric strength of the gases in the motor's combustion chamber, an explosion occurs and the piston is send downward completing a cycle. At the end of the spark event, a small flame kernel remains as raw gases continue to burn. This is where E3's DiamondFire technology helps to reduce the amount of unburned gases emitted into the environment when the exhaust valves are open. You can read more about ignition theory and combustion cycle analysis in the Technology section of this website.
Metal Shell - The metal jacket that contains the threads allows the plug to be screwed into the engine's head. Most plugs have a specific torque requirement to ensure a tight fit without damaging the female threads in the engine. Ideally, anything that has a torque value should be torqued to that value to ensure a precise seal. The metal casing also serves multiple functions as it passes heat from the insulator to the cylinder head and acts as the ground for the electrical spark traveling through the central electrode. The length of the threaded portion of the metal case must match the thickness of the head to avoid internal damage to the piston. [links]
*NOTE: Precious metals like platinum, silver and gold are not used on central electrodes for improved electrical conductivity. Since these high value metals have a higher melting point, the center wire can be smaller in diameter and still provide acceptable durability. [links]
Ribs - The length of the shell and the number of ribs both play a role in the determining how and when the high voltage ignites the fuel mixture inside the engine. Since the central electrode and insulator run the length of the plug, ribs improve insulation and prevent electrical energy from leaking out before it reaches the ground electrode and creates a spark. here
There's several major boo boo's in the YAMAHA FZ6 manual. ie, when checking the valve clearances, it's in the manual to turn the crankshaft Counter Clockwise, BACKWARDS. [links]
only guessed at based on the perceived resistance to further turning
!8.4 felt very tight to me when I last changed them out (bout a year ago) but the wrench I have is pretty accurate and I had no issues. more
Agreed, but if a torque wrench is not able to be used because it will not fit due to clearance, IMO you can reach your goals in what I stated in my other post in this thread. After all, what your are doing is crushing the "crush gasket" to seal the combustion chamber not much more. If you consider what overtightening will be and recognize it, you can achieve the goals. Bottom line, although not precise, experience by comparing torqueing with a torque wrench and that by hand "feel" can prevent negative results. more
Begin by removing the seat and engine shrouds. The engine is housed under the seat section of the Rhino 660. Use the screwdrivers to remove the shroud bolts that are holding the plastic shrouds on the engine, and use the ratchet to remove the seat bolts. Lift the seats and shrouds free of the frame and put the bolts in a cup for later use. [links]
The Yamaha Rhino 660 is a cross between an off-road ATV and a souped-up golf cart. Able to go pretty much anywhere (thanks to its locking four-wheel-drive differentials) while carrying two passengers and an additional load, it's an impressive machine. The Rhino is driven by a 660cc, liquid-cooled five-valve engine coupled to a V-belt automatic transmission, and carries a punch you wouldn't normally expect in a vehicle of this sort.
The Rhino gets most of its components and engine parts from the Grizzly 660 ATV, including the engine. The spark plugs constitute a component that can commonly go bad on ATV and off-road engines. Changing the spark plugs in the Rhino 660 may be a bit more complicated than doing so on a typical ATV; however, a novice mechanic can still accomplish this task by following the steps outlined here. more
Know that the Rhino 660 has a single cylinder with one spark plug. Locate the plug wire and trace it back to the top of the cylinder. This houses the spark plug; pull the plug wire straight up off the plug. Use the spark plug wrench to loosen the plug, then spin the plug out the rest of the way by hand. Examine the plug for fouling or burning, which could indicate the need for an engine tuneup. more
Use the spark-plug gapper to check the gap of the spark plug against Yamaha's recommendations. Adjust the gap accordingly, then screw the new spark plug in place finger-tight. Follow up by tightening the plug with the spark-plug wrench. Push the plug wire back into place on top of the spark plug, then replace the seats and the engine shrouds. here