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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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Old 05-28-2015, 08:02 AM
95jersey 95jersey is offline
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Default Slapping sound on deceleration (video)
I had a bad overheat one day and since then I have had this weird slapping sound on deceleration. At least I don't think I ever noticed it before, and when riding in gear and I completely let off the gas, the bike will surge forward a bit when I am coming to a stop when the engine kicks back.

I am thinking I ruined the top end when the bike overheated and have a new forged Wossner piston coming, but in the meantime what do you guys think this is? I would like to continue to ride the bike until I can do the top end but I don't want to do any damage to the cylinder.

http://vid1269.photobucket.com/album...psxrbwliwr.mp4

If you listen closely you can hear some harder than usual sounding kick backs on deceleration.


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Old 05-28-2015, 09:53 AM
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john r b john r b is offline
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detonation ? lean jetting?
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Old 05-28-2015, 10:24 AM
95jersey 95jersey is offline
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The jetting was fine before. Yes it has gotten warmer out, but that would only make the bike run richer.

I am thinking I did something to the top end when it overheated.
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Old 05-28-2015, 10:37 AM
stian stian is offline
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Originally Posted by 95jersey View Post
The jetting was fine before. Yes it has gotten warmer out, but that would only make the bike run richer.

I am thinking I did something to the top end when it overheated.
Slappy piston rings.
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Old 05-28-2015, 07:21 PM
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hamilton hamilton is offline
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Sure sounds like a exhaust pipe spring to me.
Check the pipe o-rings and put some rubber hose over the springs.
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Old 05-28-2015, 10:00 PM
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Quote:
Originally Posted by hamilton View Post
Sure sounds like a exhaust pipe spring to me.
Check the pipe o-rings and put some rubber hose over the springs.
My vote also.
I put Viton o-rings on my '11 and '15, problem solved.

Aluminum bike stands can make some weird noises too.
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Old 05-28-2015, 10:27 PM
desertgasser300 desertgasser300 is offline
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Pipe O-rings, mine makes the same noise and surging when it gets hot out.
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Old 05-28-2015, 11:14 PM
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Pipe O-rings, mine makes the same noise and surging when it gets hot out.
Pulling a vacuum......non sealing o rings
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Old 05-29-2015, 11:54 AM
desertgasser300 desertgasser300 is offline
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Pulling a vacuum......non sealing o rings
Which o-rings would cause that? Pipe o-rings? My pipe doesn't seal well any more from to many big hits.
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Old 05-29-2015, 12:02 PM
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Sounds like a pipe to me, mine sounds the same....
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