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Old 07-28-2013, 03:51 PM   #1
perkybewbs
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Rmz woes

Hello, I am new to this forum. I thought I would run this by some of you guys and see if you may have any information about this. The bike is a 2012 RMZ 250 and I have owned it since it was brand new. I recently had the valves checked on it. I have not ridden the bike since it has been in the shop. Anyway I went into the garage to start it up and make sure it runs right before I went to the track and after I shut the motor down, I get this weird sound about 2 seconds after the motor has been killed. This is definitely new to me and alarming. Here is a video clip of the issue. Wait about 2-3 seconds and you will hear it. The motor seems to run smoothly. The bike gets a ton of love. I do not abuse it at all. Any help would be greatly appreciated. Thanks in advance.

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Old 07-28-2013, 04:00 PM   #2
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Sounds like a decompression of the cylinder maybe....it doesnt sound bad to me though

Yours is FI right? Maybe the fuel pump or something but doesnt sound like something is messed up...
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Old 07-28-2013, 04:02 PM   #3
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You think so? To me it sounds like something that is rotating is slowing down and rubbing on something...it's weird because it only does that on a center stand. Like I said, that's a new one on me. banghead. Thing is more trouble than it's worth.

Thanks

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Old 07-28-2013, 04:05 PM   #4
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Its sounds like when u manually rotate the motor via the flywheel..like the oil pump..but I am listening to it via youtube and not there in person. I would take it back to the shop that did the valves and have em listen to it
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Old 07-28-2013, 04:11 PM   #5
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Yeah I definitely will. It sounds the same in person, it really does. I had to turn up my volume to really hear it though. Can you hear the rotation though? It starts out with a consistent grinding sound and then its intermittent as time passes and then it stops...yeah the bike is fuel injected. It doesnt sound like it's coming from the ccv breather hose or anything it's definitely inside the motor. Maybe a cam or something? What continues to rotate after the engine is shut down? I can't find an answer to that.
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Old 07-28-2013, 04:16 PM   #6
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If it has an auto decompression the cams will rotate....but Ive never heard them sound like that... if it starts easy and runs good I wouldnt care but Ive been known to blow a motor or two..ok three
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Old 07-28-2013, 04:17 PM   #7
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No kidding. I believe it does have auto decompression, but do you see what I'm talking about?
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Old 07-28-2013, 04:19 PM   #8
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It sounds like a liquid moving to me...


What I just noticed was your screen name? u a chick? With perky ?
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Old 07-28-2013, 04:23 PM   #9
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haha no. I'm a dude that likes perky . But yeah ill go back out and listen to ccv hose and ill try and get better video. sounds like metal on metal to me..thanks
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Old 07-28-2013, 04:40 PM   #10
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screen name fail!!

Good luck with the bike man
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Old 07-28-2013, 04:43 PM   #11
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alright. I went out again, and it's definitely the cams. I could hear the cam chain going through the CCV breather hose. I also heard part of compression release i guess..kinda gave off a sound like i gave it half a kick or something. I don't see how he could have done anything checking the valves...
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Old 07-28-2013, 05:01 PM   #12
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Quote:
Originally Posted by BYRDMAN View Post
screen name fail!!

Good luck with the bike man
He is right. If the screen name matched the person he would have been over. Good luck
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Old 07-28-2013, 05:05 PM   #13
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Off topic.
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Old 07-28-2013, 06:25 PM   #14
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the cam is rubbing on something. When I kick the bike, not even starting it you can hear the cams going and rubbing on something. Any idea of what the cause of this may be?
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Old 07-28-2013, 06:27 PM   #15
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Auto decomp probably.

You can take the valve cover off and watch the cam turn over.
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Old 07-28-2013, 07:37 PM   #16
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Yeah there's no denying that..auto decomp that's fine with me, but why is the cam rubbing on the side of the head? If you listen to the noise in the video its a grinding noise. That's not normal. Auto decompression is normal yes but it shouldn't be grinding on the side of the head. I don't have time to take the valve cover off.
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Old 07-28-2013, 08:33 PM   #17
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Well if you don't have time to take a peek then no point in asking questions lol.
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Old 07-28-2013, 09:07 PM   #18
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Quote:
Originally Posted by TheMagicMan View Post
Well if you don't have time to take a peek then no point in asking questions lol.
Somebody needs more pain meds!!

Well if the cams are turning for the auto decomp then its spinning the cam chain too...sooooo i wonder if its the chain u r hearing...
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Old 07-28-2013, 09:40 PM   #19
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Thanks for the response dude. I appreciate it. Yeah I can hear the cam chain going and it doesn't sound abnormal, but aside from that there is some abrasion going on that is unmistakable. It's like cccccchhhhhhhhhh cccch chh ch...ch. Obviously it is one of the cams that is rotating during decompression (no denying that) and it is rubbing (I believe on the side of the head. I believe when it actuates that little woodruff key deal on the cam, they actuator on the side of the exhaust cam sprocket sticks out in such a way to grind on the side of the case here. I had a little listen into the crank case breather hose. That's how I heard the cam chain going. Also during this cycle I could hear the piston going up or down. It kinda made like a thunk airy noise like when you kick it and it doesn't turn over. I know this bike pretty well and it just didn't show any of these symptoms before. By the way, my screename was made in a humorous intent. I'm just trying to figure out how this could have happened when this mech. had the head cracked open. I hope I havent been screwed. Thanks again guys. Please no violence.
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Old 07-28-2013, 09:51 PM   #20
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Quote:
Originally Posted by BYRDMAN View Post
It sounds like a liquid moving to me...


What I just noticed was your screen name? u a chick? With perky ?
sounds like coolant moving around to me.
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