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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 26th April 2015
MattC55 MattC55 is offline
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Default Abnormally high kick compression after wet sumping

Since this is my first official post on the board, i'll give you a brief summary of my goings on:

Bought a '68 basketcase off Chopcult and have been working diligently on putting it together, even though the previous owner really just cobbled parts together. I am finishing up little details (tail light, screwing with pegs, etc) But I have come upon a problem motor wise. We had this bike started at the end of the year and unbeknownst to me, the bike had wet sumped over the winter. This spring I started my usual kick routine and ended up splooging a good half quart out of the breather before it stopped. I have researched the issue on this forum and have to say, there are some very smart people on this board to which I am grateful! I haven't been able to find an answer to one thing though.. The oil tank reads danger-low on oil and she isn't spewing oil any more... but why is the compression so high now? It feels like there is still a TON of oil in the case, or perhaps in the cylinders? Am I just a wussy or could I still not have the oil out of the case yet? I stopped kicking her through yesterday because I didn't want to bend anything kicker related before I knew the answer. Also, I am 245 and plenty strong enough to kick her as needed.

Thank you for your time in answering my dumb question, and hope I explained everything well enough!
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  #2  
Old 26th April 2015
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A picture, cause why not!
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Old 26th April 2015
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Pull your spark plugs and do some kick thrus. Ignition and gas off.
There maybe more oil in the case than you think. Including what may have seeped into the primary.


And Welcome to the forum from Pittsburgh Pa.
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  #4  
Old 26th April 2015
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Thanks! Did that (That's how I got it to eventually stop spewing oil) Put plugs back in and that's where I am at, with the compression. It may be of some use to note that it is not CONSTANTLY hard to kick through. Only when I get to compression, then it takes all I can muster. After compression stroke, it's easy to bring it back; Once back to the compression stroke, same deal. I almost flip the bike on its right side kicking it then.
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Old 26th April 2015
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I would still kick thru more.
Have you checked your primary side oil level?

There is a 1 way valve on the primary side [thru the case] that can fail and let motor oil enter the primary. If your oil tank was about drained out and the puddle or catch can can't account for what is missing from the oil tank......
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Old 26th April 2015
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I will do some investigating.. I know there was a hellish puddle in the middle of winter I cleaned up which would probably account for most of it, and then all the rest I pushed out when kicking it over this spring.. Also, I might as well check pushrods to make sure they aren't filled with oil... Not sure what that would mean if they are plum full. There's quite the learning curve on these old ironheads!
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Old 26th April 2015
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Sounds good and yes, the learning curve can be steep. Another possible scenario is that your rings are sealing like crazy right now. The answer for that head ache is to keep on kicking thru also. I would suspect though, that your cases are full. It maybe worth the trouble to pull an oil line and try to evacuate the excess oil with the oil pump and your leg doing the work.
The learning curve is well worth the headaches.
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Old 26th April 2015
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So pull off the return line connecting to the oil tank? Am I understanding this correctly? Or do you mean pull the oil line going TO the motor, so no more will be pumped in?
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Old 26th April 2015
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Both, now that you mention it.

Meant the return line from the oil pump initially, but your question provided a better answer. Pull the return at the pump, from the oil tank, spark plugs etc. and get a kicking.

What we want is to make sure that the motor is about as dry as it can get. If you still have a tough time kicking after that, then we may or may not have some problems, like hydrolocking the pistons and bending a rod. [Not likely but one problem at a time].
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Old 26th April 2015
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Alright, sounds good! Now, the return line is the one closest to the pushrods, right??...
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