Here's some clutch advice from Dennis (owner/inventor of Golden Eagle)
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http://www.bikeengines.com/mkoinstructions.htm The top right pic shows r/s engine (Tanaka is identical) is straight on view of clutch shoes w/spring. To access clutch shoes remove the engine bracket (step#3) and clutch housing (step#1).
You'll need a GOOD Allen to remove the engine bracket/clutch housing bolts and you'll want to be sure you can torque bolts back on when you replace them. Be sure to note which bolt goes back in the correct bolt hole!
While engine is torn down to replace shoes; this is a Perfect time to clean the engine - spray brake cleaner on, and road grime/carbon drips off - Wipe well with soft cloth, to thoroughly dry.
IF YOU ARE UNSURE OF YOUR SKILLS, NOW IS THE TIME TO VISIT YOUR LOCAL SMALL ENGINE REPAIR SHOP - LET THEM INSTALL THE SHOES/SPRING!!
If you feel you're up to the task - Pay Attention when Removing Bolts and Shoes -
Mitsubishi owners
http://bikeengines.com/retrofit.htm if you have an Eagle, step 3 is pic of your clutch shoes. John Deere makes the Mitsubishi engine.
Tanaka, Robin/Subaru, Honda, John Deer - all accept the KSK 76mm clutch shoe.
If ridden properly a set of shoes should last 2 or more years - if you don't find that kind of life, it's probably your riding style. It WILL wear out shoes prematurely if, when on a hill that is so steep or long, that engine speed slows to 8 - 10 mph - it's NOT going to do any good to hold throttle Wide Open, to try to power up the hill!! You'll have Much better results if - when you feel the clutch slip, reduce throttle slightly and Pedal to assist the engine. As you feel the clutch re-engage, Slowly increase throttle, to increase speed. Listen to your engine and you'll soon learn when rpm is mated to speed, you'll have the hill climb you need.
The Subaru's continue to gain in hill climb, fuel efficiency and top speeds through 2000 miles. The Tanakas continue to improve up to 3500 miles.
I'm definitely Not a member of the Spandex gang and not about to stand up to pedal extreme hills. My feet may be on the ground but I'm hanging on to the handle bars, and I'm still pulling the throttle - that engine is Going to pull me up that Hill!!