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Thread: 2 Stroke 250 Engine Noise

  1. #1
    Join Date
    7th September 2008 - 18:48
    Bike
    2008 Yamaha YZ250
    Location
    Hamilton
    Posts
    1,076

    2 Stroke 250 Engine Noise

    My yz has quite a lot of engine noise... not a graunchy noise or anything, just the standard rattle type noise a 250 makes when idling but it seems much louder than mates bikes. Rebuilt 40 hours ago, main bearings were replaced big end was fine. Not too worried about it as it has been like that since before the re-build but i wonder sometimes when im a couple meters away and all i can hear is the engine

  2. #2
    Join Date
    24th May 2008 - 21:24
    Bike
    some honda bits in a kx chassis
    Location
    Waiuku City
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    1,326
    Does it get quieter when the clutch is pulled in?
    My bike has quite alot of clutch noise, kind of like a whirring noise, but thats normal for the gasgas' to do that.
    we may just go where no ones been

  3. #3
    Join Date
    7th September 2008 - 18:48
    Bike
    2008 Yamaha YZ250
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    Hamilton
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    1,076
    yeah the clutch accounts for a little but even with the clutch in its still louder than a clapped out 04 rm

  4. #4
    Join Date
    24th May 2008 - 21:24
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    some honda bits in a kx chassis
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    Waiuku City
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    Could be the pv arm rattling at low rpm, does it go away as revs increase?
    we may just go where no ones been

  5. #5
    Join Date
    7th September 2008 - 18:48
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    2008 Yamaha YZ250
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    Hamilton
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    yeap, ill have to look into that, thanks

  6. #6
    Join Date
    4th April 2008 - 19:08
    Bike
    '07 KTM exc200
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    auckland
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    759
    Exhaust pipe rattling a bit in the flange?

  7. #7
    Join Date
    25th April 2009 - 17:38
    Bike
    RC36, RC31, KR-E, CR125
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    Manawatu
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    you may be able to localize the noise to a part of the engine with a bit of garden hose, one end to your ear, and poke the other round the engine, tis a bit of a huckory method, but often produces results!
    "A shark on whiskey is mighty risky, but a shark on beer is a beer engineer" - Tad Ghostal

  8. #8
    Join Date
    1st December 2008 - 16:59
    Bike
    300EXC
    Location
    Waitakere
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    1,126
    Quote Originally Posted by camchain View Post
    Exhaust pipe rattling a bit in the flange?
    Thats what I was thinking also.. Often cases it aint push in properly

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