Posts
48
Joined
5/4/2014
Location
GB
Hi guys just picked up this 2004 250r for dirt cheap, it has an odd noise which I think is the decomp working at very low RPM for some reason but I want other opinions.
Video:
https://www.youtube.com/watch?v=BOkw8Sy2LiI
The idle isn't great as you can tell, in the beginning I am saving it by giving it a little gas but at around 0:20 the idle starts to come down and around 0:22 you can hear it going to die and making the noise which I think is the decomp. It only ever happens at extremely low RPM as it's about to die and I think if I sorted the idle so it didn't drop down it would go away.
Can someone confirm? I don't think it's the chain as I think for such an old motor it sounds pretty healthy!
Video:
https://www.youtube.com/watch?v=BOkw8Sy2LiI
The idle isn't great as you can tell, in the beginning I am saving it by giving it a little gas but at around 0:20 the idle starts to come down and around 0:22 you can hear it going to die and making the noise which I think is the decomp. It only ever happens at extremely low RPM as it's about to die and I think if I sorted the idle so it didn't drop down it would go away.
Can someone confirm? I don't think it's the chain as I think for such an old motor it sounds pretty healthy!
Paw Paw
By the way...If the decompression arm was making that much noise you would not be able to kick it over.
The point is that you will need to do further investigating to find the source of the problem. I gave you the most common, but remember I am not there with the bike.
I do suggest that you again check your valve clearances and if you have not changed the cam chain you do so before you blow the engine up.
There can be other reasons for the noise too.
Paw Paw
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