![]() I replaced the cam and everything worked fine. I eventually came to the uneasy conclusion that the cam shaft must have been defective (not heat treated properly?) and it simply wore out. I checked everything out and discovered that the lobes on the cam had wore down so far that the valves hardly opened. The problem was that it would start and run fine at idle, but when you revved it up it just would not go. Back then the machine had around 2000 miles. This particular machine was in my shop about 18 months ago. One the Rincon Honda decided to put a chain driven cam halfway up the cylinder and use short pushrods to move the rocker arms. It's not an "overhead" cam, it's an "along side" cam? I guess they had to have a cool chain driven cam but just couldn't give up their traditional pushrods? Other manufacturers high performance machines have overhead chain driven cams that operate the valves or rocker arms directly. The basic Hondas use a simple air cooled engine with pushrod operated valves and a cam down low in the block. I can't imagine what it must have cost to engineer that thing! It is just like a mini automotive transmission. The transmission is an actual automatic with a fluid torque converter and computer controlled solenoid shift valves. It has a big fuel injected engine, independent suspension, and an automatic transmission. This is supposed to be one of Honda's biggest and best ATV's. Today I have a 2007 Honda Rincon 680 in the shop. ![]()
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