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Knock....knock....knock....knock
- faffi
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06 Jun 2012 18:09 #527281
by faffi
1977 KZ650B1
1980 F1 engine
B1 3-phase alternator
B1 Points ignition
Knock....knock....knock....knock was created by faffi
My KZ650 is making a not-always-perfectly rhytmic knock under acceleration, even very light acceleration. Hard acceleration doesn't seem to make it worse and may even reduce the knocking. I've heard it in all 5 gears, but it's most pronounced on the lower 2 gears - perhaps because there's no wind noise to muffle things.
The sound isn't constant in that it doesn't always appear and the intensity varies from time to time. There is no knock under deceleration.
At first I expected a stiff link in the chain because the knocks are too far separated to come from either sprocket. But there are no stiff links. Sprockets appear to be in decent condition, as is the chain.
Anybody experiences anything similar? Or have any idea what it could be other than the chain?
The sound isn't constant in that it doesn't always appear and the intensity varies from time to time. There is no knock under deceleration.
At first I expected a stiff link in the chain because the knocks are too far separated to come from either sprocket. But there are no stiff links. Sprockets appear to be in decent condition, as is the chain.
Anybody experiences anything similar? Or have any idea what it could be other than the chain?
1977 KZ650B1
1980 F1 engine
B1 3-phase alternator
B1 Points ignition
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- redneckcarrow
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06 Jun 2012 18:47 #527291
by redneckcarrow
1980 kz 550 ltd stock
Replied by redneckcarrow on topic Knock....knock....knock....knock
make shure the exhaust isn't hitting
1980 kz 550 ltd stock
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- MFolks
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06 Jun 2012 18:58 #527297
by MFolks
1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)
Replied by MFolks on topic Knock....knock....knock....knock
Checked the primary and cam chains for tightness?
1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)
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- Street Fighter LTD
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06 Jun 2012 19:05 #527300
by Street Fighter LTD
Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn
Replied by Street Fighter LTD on topic Knock....knock....knock....knock
motor knocking from bad fuel or timing ????
Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn
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- faffi
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06 Jun 2012 19:07 #527301
by faffi
1977 KZ650B1
1980 F1 engine
B1 3-phase alternator
B1 Points ignition
Replied by faffi on topic Knock....knock....knock....knock
Thank you both for the hints, but nothing hits the exhaust.
Why would a tight or slack cam- or primary chain give knocks with such long intervals and for what reason? If they can make this kind of sound I'd like to learn about it.
It doesn't sound like chain slop, it sounds more like a bad bearing or the chain being caught on a tooth or being forced to bend when it doesn't want to. Only all wheel bearings turn freely and smoothly and there is no slop on the wheel or swingarm.
Why would a tight or slack cam- or primary chain give knocks with such long intervals and for what reason? If they can make this kind of sound I'd like to learn about it.
It doesn't sound like chain slop, it sounds more like a bad bearing or the chain being caught on a tooth or being forced to bend when it doesn't want to. Only all wheel bearings turn freely and smoothly and there is no slop on the wheel or swingarm.
1977 KZ650B1
1980 F1 engine
B1 3-phase alternator
B1 Points ignition
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- faffi
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06 Jun 2012 19:09 #527303
by faffi
No, it's not anything like pinging and that would be more rapid. It comes from the chain area - which could mean anything between output sprocket and rear wheel.
1977 KZ650B1
1980 F1 engine
B1 3-phase alternator
B1 Points ignition
Replied by faffi on topic Knock....knock....knock....knock
Street Fighter LTD wrote: motor knocking from bad fuel or timing ????
No, it's not anything like pinging and that would be more rapid. It comes from the chain area - which could mean anything between output sprocket and rear wheel.
1977 KZ650B1
1980 F1 engine
B1 3-phase alternator
B1 Points ignition
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- Street Fighter LTD
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06 Jun 2012 19:12 #527304
by Street Fighter LTD
Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn
Replied by Street Fighter LTD on topic Knock....knock....knock....knock
roll the bike fast, like down a small hill and listen with the motor turned off. see if you can eliminate motor or drive chain
Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn
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- faffi
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07 Jun 2012 03:30 #527409
by faffi
1977 KZ650B1
1980 F1 engine
B1 3-phase alternator
B1 Points ignition
Replied by faffi on topic Knock....knock....knock....knock
I can try that sans helmet, but as mentioned there are no sound under trailing throttle.
1977 KZ650B1
1980 F1 engine
B1 3-phase alternator
B1 Points ignition
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- faffi
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07 Jun 2012 19:07 #527536
by faffi
1977 KZ650B1
1980 F1 engine
B1 3-phase alternator
B1 Points ignition
Replied by faffi on topic Knock....knock....knock....knock
Well, after bending each link, cleaning and lubing the chain, the noise is gone Not sure if it's the bending or the cleaning or the lube that did the trick, but things are quiet now.
1977 KZ650B1
1980 F1 engine
B1 3-phase alternator
B1 Points ignition
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