mattb348
01-21-2011, 03:03 AM
I've spent a LOT of time getting a ytm225dx to finally run right.
I've spent a lot of time outside working on it in 10 degree weather (for hours).
I'm just about at wits end here...
I FINALLY got it to run perfect (ended up having to put a different carb on it, among many other things that I already did).
But as usual now there is another issue.
Here is the deal:
I had the bike running absolutely PERFECT today. It had good compression, started right up, and ran PERFECT in all aspects.
Then later today, I fired it up again, and drove it down the driveway a ways, then it died and would not start. I noticed it didn't have jack for compression now.
I took off the cam chain cover on the side of the head, and instantly found the problem.
I never tightened the big bolt that holds the cam sprocket in place nearly tight enough (oops). It had came loose (but hadn't came out very far yet). However, it loosened up enough so that the sprocket came off of the key, and was turning freely, without even turning the cam (which is why it had crap for compression I'm assuming.... because the valves weren't working right)???
It didn't hurt anything (that I could see) when this happened, other than it messed up the cam gear a little. Luckily I had a spare, which was in perfect shape. So I threw that on, and tightened the CRAP out of the bolt that holds it in place.
I then set the timing again, which came out perfect (I'm very good at doing this because I have done it a hundred times).
Then when everything was put back together, the bike wouldn't start. And guess what? I noticed it still had CRAP for compression; it pulled over WAY WAY too easy.
The decompressor was not on.
I took the cam chain cover off again, and everything was still looking and working perfect, and timing was still just fine.
What on earth is going on NOW? This is getting to be insane!
How could it NOT have compression (or run) now just because the stupid cam sprocket bolt came loose, and the sprocket spun freely for a couple seconds as the bike died???
I'm getting real close to driving this bike off a cliff. I have an EMBARASSING amount of time into this thing, and every time I think I'm finnaly done with it, something else goes wrong (literally).
The last time I checked valve clearance it was fine. But I didn't check it AFTER this incident. However, I don't see how that could have thrown the clearance off.
And I'm pretty sure I didn't blow a head gasket or sieze rings, just because that stupid cam sprocket bolt came loose. I think it is a valve issue. But I can't understand WHY this is the case.
It ran PERFECT before this crap happened.
Anyone have any ideas?
I've spent a lot of time outside working on it in 10 degree weather (for hours).
I'm just about at wits end here...
I FINALLY got it to run perfect (ended up having to put a different carb on it, among many other things that I already did).
But as usual now there is another issue.
Here is the deal:
I had the bike running absolutely PERFECT today. It had good compression, started right up, and ran PERFECT in all aspects.
Then later today, I fired it up again, and drove it down the driveway a ways, then it died and would not start. I noticed it didn't have jack for compression now.
I took off the cam chain cover on the side of the head, and instantly found the problem.
I never tightened the big bolt that holds the cam sprocket in place nearly tight enough (oops). It had came loose (but hadn't came out very far yet). However, it loosened up enough so that the sprocket came off of the key, and was turning freely, without even turning the cam (which is why it had crap for compression I'm assuming.... because the valves weren't working right)???
It didn't hurt anything (that I could see) when this happened, other than it messed up the cam gear a little. Luckily I had a spare, which was in perfect shape. So I threw that on, and tightened the CRAP out of the bolt that holds it in place.
I then set the timing again, which came out perfect (I'm very good at doing this because I have done it a hundred times).
Then when everything was put back together, the bike wouldn't start. And guess what? I noticed it still had CRAP for compression; it pulled over WAY WAY too easy.
The decompressor was not on.
I took the cam chain cover off again, and everything was still looking and working perfect, and timing was still just fine.
What on earth is going on NOW? This is getting to be insane!
How could it NOT have compression (or run) now just because the stupid cam sprocket bolt came loose, and the sprocket spun freely for a couple seconds as the bike died???
I'm getting real close to driving this bike off a cliff. I have an EMBARASSING amount of time into this thing, and every time I think I'm finnaly done with it, something else goes wrong (literally).
The last time I checked valve clearance it was fine. But I didn't check it AFTER this incident. However, I don't see how that could have thrown the clearance off.
And I'm pretty sure I didn't blow a head gasket or sieze rings, just because that stupid cam sprocket bolt came loose. I think it is a valve issue. But I can't understand WHY this is the case.
It ran PERFECT before this crap happened.
Anyone have any ideas?