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slappy wrap sound 7.5-8k rpm

Old 06-20-2016, 03:36 PM
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slappy wrap sound 7.5-8k rpm

i have a freshly rebuilt motor (maybe 200mi on since rebuild) in my 02 hawk and all of a sudden im getting a bit of noise when im accelerating hard and get to 7-8k rpm. A slappy wrap is the best way to describe noise. I am a bit concerned cuz shes been fine. Also i have been easy on her since rebuild, prolly havent even had it over 8 and a half thou rippems. overall driveability and idle are smooth as hell....?
ANY THOUGHTS? CHECK TIMING MAYBE?
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Old 06-20-2016, 04:25 PM
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Old 06-20-2016, 06:43 PM
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I'm with Nick, not sure what to make of a "slappy wrap" noise.
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Old 06-20-2016, 09:29 PM
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Can you hear it when parked and rev the throttle? If so, I'd try a stethoscope. One that is battery operated and can have the sound pick-up flush against the gear case.
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Old 06-21-2016, 01:43 AM
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will chk further tom. the noise was totally new yesterday when i took it for a ride..
the bike also started with a pop-bang, quite messed up sound, was not a typical backfire. im hoping this didnt cause the new noise at 8k rpm. it is a slappy wrap, no better way to describe
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Old 06-21-2016, 04:11 AM
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everyone knows engine wrap. its just a slap type noise.
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Old 06-21-2016, 04:27 AM
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I've never heard the term engine wrap before. I've heard of piston slap and rod knock...



I'd take it back to your builder.

Last edited by Wolverine; 06-21-2016 at 04:32 AM.
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Old 06-21-2016, 01:00 PM
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Originally Posted by Wolverine View Post
I've never heard the term engine wrap before. I've heard of piston slap and rod knock...



I'd take it back to your builder.
sounds like a combination slap and knock other than that runs great till i hit 8k.
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