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Scooters - 125 to 300 => Xciting 250 => Topic started by: Landrange on October 13, 2021, 11:41:35 AM
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My good old Xciting 250 some times make a ratteling noise at idle speed, not at revs. I took off the belt and the variator and the noise is still there! But only comes sometimes. So what can this be? The engine runs fine and sounds fine when I drive. I do have som starting issuses thou, difficult to start.
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Have you considered valve clearances? Could be behind noise & starting issues.
Excerpt from a competitor scooter forum: "as far as symptoms go, it would be performance related and or engine noise...if your valve clearance is too wide you will get a lot of what sounds like ticking or clicking. If the clearance got soo wide, you would lose a great amount of power because the engine would have a "bottleneck" and not be able to move enough air. The specific reason for this is with a large gap the valve isn't being depressed as far as it should and not allowing the proper air flow. Likewise, if your valve clearance is non-existent or unnaturally on the negative side you would lose performance because your valves would not close all the way and not provide that all important seal it needs during the various times of the stroke cycle. The sound that this symptom could make depends on the valve out of adjustment, anything from backfiring to blowback. In either case no engine damage will likely occur and the scooter will be unrideable before something could break..Hope this helps"
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@Landrange, Neils suggestion might be a winner.
Take your helmet compartement out and go with an motor stethoscope or long thin metal bar on your valve cover and listen on different spots. It's a significant chatter and clanking, a valve clicking. Easy to dedect and to disdinguish. Throttle a little bit and listen to this change of rattling.
MAINSTAND AND BRAKE PULLED!!
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Thanks for replay guys! The engine runs really fine with a good pull when I drive. Its only sometimes at idle the noise occur. But then the noise is loud enough to hear that heres something wrong. Maybe a video could tell.
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The roller weights can rattle pretty good at idle sometimes.
Nothing really wrong if that is the source of the noise.
Stig
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The roller weights can rattle pretty good at idle sometimes.
Nothing really wrong if that is the source of the noise.
Stig
Yes but the noise is there even when I remove the complete variator.
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Yes but the noise is there even when I remove the complete variator.
Well, shoot.....
Stig