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Author Topic: Oil tank empty after sitting  (Read 990 times)

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Offline beemerbum

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Oil tank empty after sitting
« on: July 31, 2018, 08:53:34 AM »
After the bike sitting for a month, I went to check the oil tank of my recently re-built '71 K7. The tank showed zero oil on the stick. I know it had a full tank of oil. None has leaked out. I'm presuming it went back into the crankcase. Is it safe to start the motor in this condition?
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Oil tank empty after sitting
« Reply #1 on: July 31, 2018, 09:17:44 AM »
If concerned you can always turn off the kill switch and crank it over with the electric starter to drain the pan. Looks like you need to get in touch with Elan for one of his oil stopper kits. Drop the oil pan, drop the pump, repair then re-install the pump and pan.
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Offline greenjeans

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Re: Oil tank empty after sitting
« Reply #2 on: July 31, 2018, 11:11:10 AM »
Quote from: Jerry Rxman Griffin aka MuthaF'er on July 31, 2018, 09:17:44 AM
If concerned you can always turn off the kill switch and crank it over with the electric starter to drain the pan. Looks like you need to get in touch with Elan for one of his oil stopper kits. Drop the oil pan, drop the pump, repair then re-install the pump and pan.

Yep - I can vouch for Elan's little stopper kit.   Pretty easy fix.
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Offline PeWe

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Oil tank empty after sitting
« Reply #3 on: July 31, 2018, 12:28:58 PM »
My CB750 K6 was like that from the beginning and during 100.000 km + some more until It got another oil pump keeping the oil in tank longer.
No problems at all. Easier to change oil with min oil in tank.
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Online Don R

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Re: Oil tank empty after sitting
« Reply #4 on: July 31, 2018, 09:20:45 PM »
 It's Ok until it chooses to leak out of the sprocket seal. I need the kit and a sprocket seal.
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Offline PeWe

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Re: Oil tank empty after sitting
« Reply #5 on: August 01, 2018, 09:07:30 AM »
My K6 has never leaked a drop thru the sprocket seal.

There are also new oil pump parts from forum member Messnermoto to help keeping the pressure up.
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Bodi

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Re: Oil tank empty after sitting
« Reply #6 on: August 04, 2018, 08:41:56 AM »
The scavenge pump is quite large compared to the pressure pump, when the engine wet sumps because the stopper valve leaks it might delay oil pressure to the engine for a second or two (while the scavenge pump gets oil into the tank) but this is not a problem. Fix it if so inclined, it is a good idea to drop the pan and check the pump screen now and then anyway. The pump unbolts and drops out the bottom, and installing the new stopper is super easy. New O rings for the connections to the main case would be a wise investment.
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Offline 754

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Re: Oil tank empty after sitting
« Reply #7 on: August 04, 2018, 09:31:48 AM »
Ride every week and dont worry about it.
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