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Old 08-30-2009, 02:30 PM   #1
jarhead252
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Default Please help!

I just purchased a brand new 2009 Yamaha R1 one month ago. I just had the first maintenance at 600 miles last week. Ever since I had the oil changed I have noticed something strange. Everytime I start the motorcycle in the morning I get 2 or 3 "knocks" in the engine. It only knocks 2 or 3 times and then idles normal with no other weird noises. No other noises while riding even at high rpms and the bike runs awesome! If I leave it off for about 10-30 minutes after riding and then start it again I dont get the knock but if it sits for over an hour it knocks when I start it. Is this something that is normal due to the oil settling or is this something I should be concerned with? I have owned several motorcycles in the past but this is my first fuel injected bike so maybe it is normal and I am just being paranoid. Any help or advice would be greatly appreciated!
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Old 08-30-2009, 04:52 PM   #2
mscuddy
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Default Yes, that's serious

Who did the maintenance? "Knocking" at start-up usually means a dry plain bearing (like a con rod, etc) that quits knocking when the oil pressure builds up. It's also know as "death rattle."

You might have a speck of dirt in one of the pressure check valves that is in the oil pump, that keeps the oil from draining back into the sump, so the mains & conrod bearings are kept wet with oil when you start it up (so you don't wipe a bearing). You can stop this yourself by keeping the kill switch in the "off" posiiton for a few revolutions of the crankshaft, so it builds up pressure before you start it.

Take it to a Yamaha shop and get it checked out (preferrably not the one that changed the oil). Yes, that is serious and demands immediate attention.
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Old 08-30-2009, 07:06 PM   #3
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Quote:
Originally Posted by mscuddy View Post
You can stop this yourself by keeping the kill switch in the "off" posiiton for a few revolutions of the crankshaft, so it builds up pressure before you start it.

Take it to a Yamaha shop and get it checked out (preferrably not the one that changed the oil). Yes, that is serious and demands immediate attention.
'Ceptin' that thar "Fool Injerkshun" won't let the engine even crank with the run switch in the "Not Run" position.......
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Old 08-31-2009, 06:29 AM   #4
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'Ceptin' that thar "Fool Injerkshun" won't let the engine even crank with the run switch in the "Not Run" position.......
I'm sure Matt meant for the guy to use the kickstarter to run it through a few times...
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Old 08-31-2009, 06:48 AM   #5
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Yikes! A new R1 knocking during startup? Take it back to the dealer and demand a new engine. Show them the knock, even if you have to wait overnight and truck it there. Do not accept any BS about it being some minor problem. If they hem and haw get a lawyer to send a threatening letter. Check out your State's lemon laws. If it is knocking it has already sustained damage that will lead to early failure. Probably a rod is banging on a bearing and has already made a dimple in it.

Engine knocks always precede self-destruction.
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Old 08-31-2009, 08:18 AM   #6
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I'm sure Matt meant for the guy to use the kickstarter to run it through a few times...
HAHAHAHAHAHA, NICE!
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Old 08-31-2009, 08:34 AM   #7
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+1 on the double-time run to the Dealership.

Trailer it there so it is stone-cold when you demonstrate the problem.
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