rattle sound
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@irongamer727
sound to me like powervalve, mine used to do this, bushes get a bit worn and they rattle , or piston is hitting it and it rattles, either way take cover of pv and feel the end will soon know
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the powervalve is open and not hooked up. dont think it is in contact with the piston as it has been sounding like this for a couple of 1000 kilomiters. dont you guys think it might be a worn piston? the snorkel is ON
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@irongamer727 Ahh if the PV is pinned that would explain why I thought the snorkel was out.
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Ye. Previous owner managed to f*ck up the port somehow. Running great without but the sound worries me. Need this cylinder to last the season out.
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@irongamer727 Literally mitaka piston is £40 plus gaskets £20 and an hour job to replace.
There isn't really an excuse for two strokes to fail.
It's either the piston fails and costs you a full rebuild, or you spend £60 and replace the top end making it good for another 10k miles.
If it is even the top end that's the problem.
Either way, you're putting your life in the hands of a machine you don't feel comfortable in. If the machine fails, you have the risk of taking not only your life, but those around.
For the sake of strippng the cylinder down for a quick gander, it hardly seems worth the hassle of it failing.
That's my two cents anyway. I would always be overly cautious.
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This post is deleted!
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How big is the chance that a dt engine with 24000 km on it has failed connecting rod bearings? Anyone experienced that?
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Entirely possible
Depends on use and abuse tbh
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Does that sound have any similarity with that?
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Sorry I'm on holiday in France at moment miles from any wifi
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Spoke to a yamaha dealer today. He said not to worry and that it most likely is the powervalve vibrating a bit.
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@irongamer727 that is something abit more than the powervalve vibrating I'm sure I'd look into that abit more if I were you, could end up costing you a complete rebuild if it goes
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@andrewj1680 sounds a bit different in reality. But he has been sounding like this a looong time now. Pretty sure it's the powervalve. It's just open and might be shaking a bit.
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Could it be an air leak at the power valve making a sound like a rattle? I've heard different types of pv clattering on a closed throttle but I'm not certain I'd like to ride around with a random rattle without at least figuring out what's the cause.
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For the sake of £20 on gaskets and 30mins work I would pull the top end off could be little or nothing but atleast you know. I'd cringe riding around sounding like that I'd be constantly waiting for it to go bang
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Yesterday I finally took the top end apart. Piston, rings, rod looked perfect! The only probable culprit according to me was the needle bearing. It felt like a "marraccas". Could that have been causing the rattle? The piston and ring gap was not excessive what so ever..
The pv that was supposed to be jammed shut was not "correctly" jammed. It might have caused some rattle sound. But other than that I am clueless. -
Anyone??
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Little end rattle is a common noise to be heard from the top end when a little end bearing is reused and or damaged.
Continual use of a worn bearing will eventually wear out the connect rod, resulting in a rebuild of the crank.
The powervalve can rattle too, if it's not secured properly by the bushes, either worn or the like.
But ultimately, two strokes are rattly by nature, be sure you're not just being paranoid.
