- Posts: 103
- Thank you received: 0
strange noise
- kayodash
- Topic Author
- Offline
- User
Less
More
20 Apr 2016 07:31 - 20 Apr 2016 07:37 #721984
by kayodash
1984 Kawasaki KZ550 LTD F2
1981 Kawasaki KZ750 LTD
strange noise was created by kayodash
Hello guys! So over the winter I picked up another bike. This one being a 1981 Kz750 ltd. Starts and runs, drives fine. It has developed a strange noise first noticeable around 1200rpm. Gets louder/more pronounced the lower the rpms. Idling around a grand sounds like its gonna break. I don't even know how to explain the noise.. But it isn't noticeable when I ride or idle at 15 grand... It seems to appear on the right side of the motor. Maybe lower end or middle? Can't hear it much on the left side.. I'll try to take video of it. Any ideas? The bike has about 36,000 miles on it. Maybe cam chain? Or tensioner? Possible valve Noise? I don't even know what to look up to see if it's somewhere in another post.
1984 Kawasaki KZ550 LTD F2
1981 Kawasaki KZ750 LTD
Last edit: 20 Apr 2016 07:37 by kayodash. Reason: wrong side
Please Log in or Create an account to join the conversation.
- SWest
- Offline
- Sustaining Member
- 10 22 2014
Less
More
- Posts: 22972
- Thank you received: 2749
20 Apr 2016 07:39 #721987
by SWest
Replied by SWest on topic strange noise
The FIRST thing you should do is check the valve clearances. Then the cam chain adjuster if you have a manual one. The noise could be the carbs being out of sync. These engines can make frightening noises at idle like that. You also need a MANUAL.
Steve
Steve
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
Less
More
- Posts: 18640
- Thank you received: 2098
20 Apr 2016 07:45 #721988
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic strange noise
A disturbing sound at low idle rpm -- like digesting nails -- can usually be reduced or eliminated by a good carb sync.
And a good carb sync is predicated by valve clearances within spec, healthy fat blue properly timed spark, correct fuel levels, and ample fresh clean fuel supply.
Good Fortune!
And a good carb sync is predicated by valve clearances within spec, healthy fat blue properly timed spark, correct fuel levels, and ample fresh clean fuel supply.
Good Fortune!
1973 Z1
KZ900 LTD
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
Less
More
- Posts: 18640
- Thank you received: 2098
20 Apr 2016 07:52 #721989
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic strange noise
For a free downloadable KZ750 4-cyl service manual, use this link, and scroll down to "The Bible" ---
mbsween.bike-night.com/kz750l3/index.html
Good Fortune!
mbsween.bike-night.com/kz750l3/index.html
Good Fortune!
1973 Z1
KZ900 LTD
Please Log in or Create an account to join the conversation.
- kayodash
- Topic Author
- Offline
- User
Less
More
- Posts: 103
- Thank you received: 0
20 Apr 2016 17:11 #722058
by kayodash
1984 Kawasaki KZ550 LTD F2
1981 Kawasaki KZ750 LTD
Replied by kayodash on topic strange noise
Thanks for the fast replies! I'll start looking for a valve cover gasket and the end caps, also a vacuum gauge to sync the carbs. There's a link that shows the noise is making at 1000rpm
1984 Kawasaki KZ550 LTD F2
1981 Kawasaki KZ750 LTD
Please Log in or Create an account to join the conversation.
- SWest
- Offline
- Sustaining Member
- 10 22 2014
Less
More
- Posts: 22972
- Thank you received: 2749
20 Apr 2016 17:23 #722062
by SWest
Replied by SWest on topic strange noise
Classic stumbling caused by out of sync carbs.
Steve
Steve
Please Log in or Create an account to join the conversation.
- missionkz
- Offline
- Sustaining Member
20 Apr 2016 21:05 #722122
by missionkz
Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado
Replied by missionkz on topic strange noise
Sounds like piston and cam chain slap from unbalanced cylinder fire, usually associated with misadjusted and unbalanced carbs.
Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado
Please Log in or Create an account to join the conversation.
- SWest
- Offline
- Sustaining Member
- 10 22 2014
Less
More
- Posts: 22972
- Thank you received: 2749
20 Apr 2016 21:08 #722123
by SWest
Replied by SWest on topic strange noise
The smaller fours seem to make more noise than the large ones, still mine can make some alarming noises when out of sync.
Steve
Steve
Please Log in or Create an account to join the conversation.
- kayodash
- Topic Author
- Offline
- User
Less
More
- Posts: 103
- Thank you received: 0
17 May 2016 18:58 - 17 May 2016 19:09 #727077
by kayodash
1984 Kawasaki KZ550 LTD F2
1981 Kawasaki KZ750 LTD
Replied by kayodash on topic strange noise
Still making noise at a grand idle. Carbs ae synced. I think it may be the chain tensioner? I believe it's an automatic tensioner, it Has a lock screw in it. Any ideas guys?
1984 Kawasaki KZ550 LTD F2
1981 Kawasaki KZ750 LTD
Attachments:
Last edit: 17 May 2016 19:09 by kayodash. Reason: more idea
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
Less
More
- Posts: 18640
- Thank you received: 2098
17 May 2016 19:19 - 17 May 2016 19:21 #727078
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic strange noise
Are valve clearances within specs?
If mechanical timing advancer is fitted, would assure correct ignition timing at idle rpm and that the advancer is in good serviceable condition. clean and lubed.
Good Fortune!
If mechanical timing advancer is fitted, would assure correct ignition timing at idle rpm and that the advancer is in good serviceable condition. clean and lubed.
Good Fortune!
1973 Z1
KZ900 LTD
Last edit: 17 May 2016 19:21 by Patton.
Please Log in or Create an account to join the conversation.
- kayodash
- Topic Author
- Offline
- User
Less
More
- Posts: 103
- Thank you received: 0
17 May 2016 19:23 #727080
by kayodash
1984 Kawasaki KZ550 LTD F2
1981 Kawasaki KZ750 LTD
Replied by kayodash on topic strange noise
Yes, valve clearances are in spec. Visually looking at the advancer it looks fine.
1984 Kawasaki KZ550 LTD F2
1981 Kawasaki KZ750 LTD
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
Less
More
- Posts: 18640
- Thank you received: 2098
17 May 2016 19:27 #727083
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic strange noise
Would check for alignment of advancer F mark with timing light at idle rpm.
Good Fortune!
Good Fortune!
1973 Z1
KZ900 LTD
Please Log in or Create an account to join the conversation.