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Old 12-14-2015, 06:55 PM   #1
Bgsxr1000
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2006 Yamaha Yz450f Knock

So I have a yz450f and when running it has a knocking sound. I have been trying to find something on the net but nobody seems to pin point it. Let me know if you can help. Thank you
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Old 12-14-2015, 08:22 PM   #2
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A knock on a race bike is pretty hard to diagnose over the web. Could be a crank bearing, dropped valve, timing chain, something in the combustion chamber... Tough to say.
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Old 12-15-2015, 07:42 AM   #3
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Well, a knock would usually signify piston slap(small bearing or rings) or crank bearing. A tinging/or pinging, if you will, is usually something smaller on the top end. Like valves, piston rings, piston wear, or loose exhaust. Do a compression test to rule out valves or piston ring issue. Have somebody with knowledge take a look at it. Internet diagnosis is a little tough from your description, that's why nobody has pinpointed it. I don't want to sound like an , but hears what I hear you asking - "I woke up this morning and my body hurts, what could it be?" There are many answers.
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Old 12-15-2015, 07:44 AM   #4
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when you part it out, dibs on the carb!
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Old 12-15-2015, 12:22 PM   #5
gbalias
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how many hours on it?
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Old 12-15-2015, 12:52 PM   #6
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It's a dirt bike, tear that sum down and find out what's broken/out of spec. It could be a number of things, but you can locate/eliminate pretty much every single one once you get it down to the top end.
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Old 12-15-2015, 01:15 PM   #7
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maybe its just the standard 4stroke engine noise. we have no background as to it was quiet, then after riding it all day it started making noise, etc...

does the sound match the RPM? does it get quieter or louder wth clutch pulled in?

not enough info to even come close to diagnosing really.
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Old 12-15-2015, 02:06 PM   #8
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If you want to check something very easy, check and make sure you're not too low on engine oil. STEP #1
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Old 12-15-2015, 04:05 PM   #9
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Old 12-15-2015, 07:25 PM   #10
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I will let it go for 1500! That comes with a stand and 1-5gallon jug of U-4 race gas
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