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loose head?
- mr anderson
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17 Jun 2008 06:53 #220477
by mr anderson
loose head? was created by mr anderson
I noticed this morning after I started my 77 kz650 that oil was bubbling out of where I believe the head gasket is.(not a lot but enough that after a few rides it drops a little oil) do the head bolts usually come loose on these bikes? does anyone know what to torque them to? Hopefully this fixes it. My bike did come with a head gasket but it's at least a year old so I dont know if it is still good to use or not, it does look ok.
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- mtkawboy
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17 Jun 2008 08:43 #220493
by mtkawboy
78-KZ1000/1105, 80 KZ1000, 82 Kawasaki GPZ750, 95 Harley Fatboy, 80 Suzuki GS1100ET, 81 GS1100E parts bike, 83 GS1100SD Katana/1394,78 Yamaha XT500, 81 Yamaha XS650, 78 Yamaha XS650E, 48 Whizzer model J motorbike, 71 Honda CT70H, 71 Honda CT70, 81 IT 250 Yamaha,82 Honda XL100S owned
Replied by mtkawboy on topic loose head?
They will weep oil after a while, only a new head gasket will fix it but you could check the torque if you want. Id be amazed if it stopped it
78-KZ1000/1105, 80 KZ1000, 82 Kawasaki GPZ750, 95 Harley Fatboy, 80 Suzuki GS1100ET, 81 GS1100E parts bike, 83 GS1100SD Katana/1394,78 Yamaha XT500, 81 Yamaha XS650, 78 Yamaha XS650E, 48 Whizzer model J motorbike, 71 Honda CT70H, 71 Honda CT70, 81 IT 250 Yamaha,82 Honda XL100S owned
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- bountyhunter
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17 Jun 2008 12:06 - 17 Jun 2008 12:11 #220513
by bountyhunter
1979 KZ-750 Twin
Replied by bountyhunter on topic loose head?
Torque spec on mine is about 30 ft-lbs (360 in-lbs).
Head gaskets do seep oil sometimes, even new ones.
If it was rebuilt, the head probably needs retorqueing. Mine definitely did.
BTW: on mine, there are several small bolts that go up from under through the cylinder into the head. Those are there to help stop the seepage. Don't know if yours have these, look for them. Mine torque to about 100 inch-lbs.
Head gaskets do seep oil sometimes, even new ones.
If it was rebuilt, the head probably needs retorqueing. Mine definitely did.
BTW: on mine, there are several small bolts that go up from under through the cylinder into the head. Those are there to help stop the seepage. Don't know if yours have these, look for them. Mine torque to about 100 inch-lbs.
1979 KZ-750 Twin
Last edit: 17 Jun 2008 12:11 by bountyhunter.
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- mtkawboy
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17 Jun 2008 12:20 #220518
by mtkawboy
78-KZ1000/1105, 80 KZ1000, 82 Kawasaki GPZ750, 95 Harley Fatboy, 80 Suzuki GS1100ET, 81 GS1100E parts bike, 83 GS1100SD Katana/1394,78 Yamaha XT500, 81 Yamaha XS650, 78 Yamaha XS650E, 48 Whizzer model J motorbike, 71 Honda CT70H, 71 Honda CT70, 81 IT 250 Yamaha,82 Honda XL100S owned
Replied by mtkawboy on topic loose head?
Im not at all familiar with the 650s, just the 900/1000 motors so it could be. I didnt realise the head had been off recently either, I thought it was an original motor. Worth a try anyway, go for it.
78-KZ1000/1105, 80 KZ1000, 82 Kawasaki GPZ750, 95 Harley Fatboy, 80 Suzuki GS1100ET, 81 GS1100E parts bike, 83 GS1100SD Katana/1394,78 Yamaha XT500, 81 Yamaha XS650, 78 Yamaha XS650E, 48 Whizzer model J motorbike, 71 Honda CT70H, 71 Honda CT70, 81 IT 250 Yamaha,82 Honda XL100S owned
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- OnkelB
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17 Jun 2008 14:37 - 17 Jun 2008 14:38 #220545
by OnkelB
77 KZ 650 B1, 82 GPz 1100 B2.
Replied by OnkelB on topic loose head?
As Bounty says the head should be torqued around 30 ft.lbs (27-31ft.lbs/36-41 Nm). No bolts coming up from underneath, but there are two bolts (front and rear) right under the cam sprockets, these should be torqued to 16-20 ft.lbs/22-27 Nm.
If the oil is coming out at the front just above no. 3 exhaust it might be your tach drive leaking.
If the oil is coming out at the front just above no. 3 exhaust it might be your tach drive leaking.
77 KZ 650 B1, 82 GPz 1100 B2.
Last edit: 17 Jun 2008 14:38 by OnkelB. Reason: Typo
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- Patton
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17 Jun 2008 15:36 - 17 Jun 2008 15:43 #220561
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic loose head?
Another possible source of leak could be a loose exhaust header clamp, or an exhaust gasket failing to completely seal.
Good Luck!
Good Luck!
1973 Z1
KZ900 LTD
Last edit: 17 Jun 2008 15:43 by Patton.
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- Patton
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17 Jun 2008 15:43 #220562
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic loose head?
If not already done, could also do a compression test (hold throttle wide open during testing). Then if compression is low, would also assure correct valve clearances and re-do compression test, and also perform a leakdown test, before blaming the head gasket for low compression.
1973 Z1
KZ900 LTD
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- mr anderson
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18 Jun 2008 06:51 #220678
by mr anderson
Replied by mr anderson on topic loose head?
Im going to try to re torque it soon, the leak is on the inside (not exhaust) like I said the leak is minimal so I think it will fix it. just a side question, has anyone heard of using leak stop that you use in cars in a motorcycle? just wondering.
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- Sandy
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18 Jun 2008 07:40 #220690
by Sandy
1977 KZ1000 A-1
Replied by Sandy on topic loose head?
Even if there WAS such a product,I wouldn't even think of using it in the KZ.I think you would end up with clutch problems(slipping,or even sticking) because the clutch uses the same oil as the engine.
1977 KZ1000 A-1
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- mr anderson
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18 Jun 2008 10:03 #220708
by mr anderson
Replied by mr anderson on topic loose head?
good point, I did not know that.
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- bigkaw815
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18 Jun 2008 11:26 #220721
by bigkaw815
Replied by bigkaw815 on topic loose head?
I feel your pain. I started getting discolored pipes down the middle of the headers about a year back. I figured it was a weird bluing pattern caused by it being out of tune. Then, as I gunned her one day (79 kz650b3), I felt something wet on my knee. When I got her home, I saw I had a head leak. Oil had been pushing out of the head sometimes and was shooting onto my headers in the middle causing the weird bluing/browning. I bought the top end gasket kit, but I need to screw my courage together in order to take everything apart and put it all back together again properly. I will get in it soon and post a topic with pictures to show my progress. Let's do it together!
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- mr anderson
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18 Jun 2008 13:31 #220740
by mr anderson
Replied by mr anderson on topic loose head?
dude now your scaring me! my pipes are bluish also! but I havent had any oil squirt on my legs when I gun it. If torquing it doesnt work we will have to do it together.
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