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Spun a rod bearing
- kxhonda
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Heres the bearings.
Post edited by: kxhonda, at: 2008/03/03 20:01
1977 Kz650B1 #576th made.
Warsaw, In
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- kxhonda
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- kxhonda
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650 cylinders on the left, 750 clylinders on right.
1977 Kz650B1 #576th made.
Warsaw, In
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- 650ed
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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- Patton
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Any ideas on what caused the problem to occur?
Caution -- unsolicited opinion follows :lol:
Perhaps not the underlying cause in this instance, but am thinking one reason for rod bearing failure could be from gasoline intrusion into the crankcase oil. There have been several recent forum discussions regarding excessive fuel in the float bowl (for whatever reason the excess incoming fuel is not all being discharged by the overflow system) which excess fuel rises up into the carb bore and flows both ways, forward into the combustion chamber (then down around the pistons into the crankcase) and backward into the airbox (then down through the crankcase vent hose into the crankcase. This condition of fuel intrusion into the crankcase oil may occur while the bike is parked or during normal riding. So anytime a floatbowl overflow is noticed, it is usually a good idea to sniff-check the crankcase oil for any gasoline odor, and if so, change the oil and filter (plus correct the overflow problem). Another indication is an unexpected increase in oil level when viewed through the sight glass. And the fuel-contaminated oil will also likely be thin and watery.
This gets particularly critical with Mikuni smoothbore carbs which have no floatbowl overflow provision. I think it's the primary reason smoothie users run the crankcase vent tube to directly underneath the bike or anywhere besides into the airbox.
1973 Z1
KZ900 LTD
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- steell
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and up until last week I don't recall any post on any 650 spinning
a rod bearing, and now there's two separate threads. I certainly
hope this doesn't indicate a trend
I think Patton has a point, I always turn off
the petcock when I shut off the motor. I'm
glad the 750B's have on/off/reserve petcocks
and not vacuum operated.
Post edited by: steell, at: 2008/03/03 21:23
KD9JUR
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- kxhonda
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1977 Kz650B1 #576th made.
Warsaw, In
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- kxhonda
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1977 Kz650B1 #576th made.
Warsaw, In
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- BSKZ650
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most of the time you see a bearing failure like that its caused by oil pumps going bad, and not keeping up with the demand of the motor.
On a small block chevy, rod bearings 5 and 6 will be the first to go when they loose oil pressure,
I would be rebuilding or replacing the oil pump for sure
77 kz650, owned for over 25 years
77 ltd1000, current rider
76 kz900, just waiting
73 z1,, gonna restore this one
piglet, leggero harley davidson
SR, Ride captian, S.E.Texas Patriot Guard Riders.. AKA KawaBob
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- kxhonda
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1977 Kz650B1 #576th made.
Warsaw, In
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- NickW900LTD
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- Nick
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1976 KZ900 LTD (sold)
1977 KZ1000 LTD
1978 KZ1000 A2A
Pierceton, Indiana USA
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- NickW900LTD
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1976 KZ900 LTD (sold)
1977 KZ1000 LTD
1978 KZ1000 A2A
Pierceton, Indiana USA
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