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Old 09-01-2011, 06:24 PM   #1
racefan
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hello, just signed up and wanted to say hi...

i also have a question, so i have an 81 cm400 custom and it has a tisking sound in the motor, my first thought was the lifters, well i bought a feeler gauge and went through the lifters and i still hear the sound. i dont think its the piston knocking because its not burning oil or smoking, does anyone have any ideas..thanks
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Old 09-02-2011, 06:25 AM   #2
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It's just a noisy motor. Buy some ear plugs and don't worry about it.
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Old 09-02-2011, 06:38 AM   #3
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ya it just drives me crazy though would be nice if it was quiet...
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Old 09-02-2011, 06:44 AM   #4
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ya it just drives me crazy though would be nice if it was quiet...
Motorcycle engines are not quiet.

Open the hood of your car and get your head as close to the engine as it is on your bike. Car engines aren't quiet either, just better insulated.
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Old 09-02-2011, 07:00 AM   #5
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+1

Air cooled engines are really noisy. The cooling fins act like 'speakers' and make any innocuous noise very noticeable.

And, the source of the noise can be almost impossible to locate, because you frequently hear it from somewhere it isn't.

Earplugs. Learn to love 'em.
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Old 09-02-2011, 10:02 AM   #6
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It's when the valvetrain STOPS making a clattering-racket that you'd best pull the cover and whip-out the feeler-gauge. Of course, by then, it might be too-late....

Loose Valves = Good
Tight Valves = Burnt Valves
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Old 09-02-2011, 06:24 PM   #7
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well i took it to a local guy who works on these older bikes and he said the same thing that its normal and not to worry. not that i dont trust any of you i just like to get a various amount of opinions....thanks to every one for the help..
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Old 09-02-2011, 06:26 PM   #8
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he said the same thing that its normal and not to worry. not that i dont trust any of you .
And what did you learn from this experience, Grasshopper ??

Honeslty though, the best you can get from a fourm is a guess.
Regardless of the question, not being there to see and hear and feel it makes any answer a little suspect.
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Old 09-05-2011, 05:15 PM   #9
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what would be the thickest oil i can run in the motor ?
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Old 09-05-2011, 06:06 PM   #10
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Run what the manufacturer recommends. Do not use automotive oil. Don't use synthetic in an old motor. You can get reasonably priced bike oil at Autozone.
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