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Mechanics 101 Can't get it to run right? Find a trick to add HP? From the first oil change to completely rebuilding the engine, this is the place to talk about the heart of the beast! |
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#21 | |||
Kat King
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Just curious.
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90% of motorcycle forum members do not have a service manual for their bike. Quote:
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#22 |
Kat Legend
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![]() No, just the crank moving fast enough to shake around a bit. Remember that a rod stops twice each revolution, so at each stop you'll get a knock from a rod. Cranks don't stop, so you need to spin them up to hear the bad bearing.
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#23 | |
Kat King
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Makes sense. Replaced the crank bearings and big end bearings on the RM last time just for ****s and giggles. The crank didnt seem to have much runout, but it DEFINITELY needed some new seals...what a mess...it was like sandy peanut butter down there ![]() |
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#24 |
Kat Legend
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![]() Your RM uses roller or needle bearings. The Kat uses bearings like a car engine. Also, if one goes bad, there are 4 others to support as I believe the Kat is a 5 main bearing engine....but that doesn't last long. Also, the knocking is only when the rod next to the main bearing is near the top or bottom of the stroke. More stress on the crank at that point.
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#25 | |
Kat King
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#26 |
I let "things" slide
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![]() you are correct, but you should add that this applies to both ends of the rod, which includes wrist pins, which can just as easily be the problem.
__________________
I don't have a short temper. I just have a quick reaction to bullshit. ![]() |
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#27 | |
Kat King
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OP needs to tear that sucker down to make sure. |
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#28 | |
I let "things" slide
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I am not questioning which is right or wrong or anything like that.....just curious is all. |
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#29 |
Kat Legend
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![]() The rings don't cushion anything. The piston is free to move in the rings. There is a fine film of oil that helps keep it centered, but really that's it. On a worn motor, you see the marks in the cylinder from the piston. It's typically a mark on the front of the wall, and another on the back. That's normal wear from the piston skirt as it moves front to rear with the change in the stroke. All the rings do is seal the cylinder and wipe the oil off the cylinder walls.
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#30 |
Kat King
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![]() So we're saying the same thing
![]() Either way...OP needs to either spend some time or buy a new engine. Afterall, it's a Katana 600, and you can get one of those engines for cheaper than replacing a bearing. Hell almost as cheap as the bearings themselves |
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