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 screeching noise at take off
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Joined: Jun 2010
Posts: 116
Adjunct
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OP
Adjunct
Joined: Jun 2010
Posts: 116 |
http://youtu.be/QMDFRZvcq3Uanyone else have this same noise? i've been told it could be the sprag clutch but i thought the sprag was only directly related starting the bike. any of you master mechanics have any input?
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Re: screeching noise at take off
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Joined: Mar 2013
Posts: 497
Adjunct
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Adjunct
Joined: Mar 2013
Posts: 497 |
Sounds like clutch to me.
05 Speedmaster,Reverse Cone Shortys,Thunderbike AIR Kit,K&N Air Filter,Snorkel Removed,Dynojet Stage 1 Kit(126 main),Needle-Clip 1 From Bottom,42 Pilot,NGK Iridium Plugs,Progressive Springs,Hagon 2810's,Barnett Green Springs,TTP Safe-Start,MOSFET R/R
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Re: screeching noise at take off
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Joined: Apr 2007
Posts: 3,063 Likes: 8
Loquacious
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Loquacious
Joined: Apr 2007
Posts: 3,063 Likes: 8 |
When the starter is activated the sprag clutch connects it to the crankshaft (simply speaking) turning it. When the engine starts, the crank now turns faster than the starter so the sprag slips allowing the starter motor to stop and not be ruined by spinning out of control. The sprag usually acts up when it slips all the time not allowing the engine to start (starter simply spins).
This sounds like a clutch slipping slightly. What oil are you using in the engine? How many miles on the clutch? You may have to pull the side cover and take a look. You will loose some oil though.
It also sounds like your back tire chirping on the pavement. Does it do it while the bike is running?
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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Re: screeching noise at take off
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Joined: May 2010
Posts: 5,720
Check Pants
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Check Pants
Joined: May 2010
Posts: 5,720 |
Didn't one of our Brothers from down under just go through this (screech at takeoff) and it turned out his chain and sprockets were worn out? I'm horrible with names, a personal failing, or I could probably pull up a link. Found it: web page ]Link[/url]
Last edited by Ryk; 06/07/2014 3:01 AM.
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Re: screeching noise at take off
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Joined: Aug 2005
Posts: 485
Adjunct
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Adjunct
Joined: Aug 2005
Posts: 485 |
I get that same noise but only occasionally. I usually get it on cool days on takeoff from a dead stop before the bike is warmed up. I've found that if I take it easy on takeoffs at least until it's warmed up, then I don't hear it. I don't get it repeatedly like you do in the video; my bike would usually do it once early in a ride and then not do it again.
I've always assumed it was clutch, and that it has something to do with the engine and oil getting warmed up. But i read the other thread about it possibly being chain-related. Sorry i dont have any helpful info for you...just noting that i hear the same thing occasionally. Are you hearing it all the time on takeoffs?
Will
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Re: screeching noise at take off
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Joined: Jun 2010
Posts: 116
Adjunct
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OP
Adjunct
Joined: Jun 2010
Posts: 116 |
only takeoffs and sometimes hard downshifts
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Re: screeching noise at take off
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Joined: Apr 2008
Posts: 385
Adjunct
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Adjunct
Joined: Apr 2008
Posts: 385 |
My neighbor has the same problem with his '03 Road King. HIs is belt drive of course, so that would also suggest clutch?
06 in Mulberry. AI, Dunstalls, Nology coils, TTP
Keep your faith in God, but keep your powder dry.
-Oliver Cromwell
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