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My 99 evo blows oil out around the head on the front cyl and smoke out the exhaust

The bike Sat for a bit ?

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Hi, Stacey it's called "WET SUMPING" most Harley's with external oil pumps if left sitting for weeks or months will eventually let the oil tank contents drain pass the oil pump check ball and fill up the bottom end of the crankcase when the bike is started the excess oil will gush out of the breather vent and if routed to the air cleaner will also flood the filter. This messy condition will continue until the bottom end is forcibly emptied by the flywheels or manually drained if there is a plug. There are 3 options you may want to consider:
1. Drain the oil tank before storing the bike.
2. Replace check ball and resurface seat in the oil pump.
3. Install inline ball valve shut off in the feed line to the pump.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below and for more specific questions or answers at no charge please feel free to contact me at Good luck and have a wonderful day.
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Posted on May 04, 2017


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How emportent is one cyl. Out of four down 30lbs on 4 Cyl. Honda

Actually, that is pretty significant discrepancy. Even though it's a flat four and one of the smoothest engines for bikes ever made, that much of a difference IS going to be noticeable. Not only that, it's about 99% a fact that it will not get better, but worse over time.

Since the GL1100's use single over head cams, the valve adjustments are critical. Due to a valve seating a little too deeply into its seat in the combustion chamber the the valve to rocker arm clearence will be diminished, and possibly become non-existant, keeping the valve open just a hair all the time. SOLUTION: Get some new valve cover o-rings gaskets, remove the covers, and adjust all of the valve clearances. If you have a tight one, You'll find it.

You also may have a burnt exhaust valve or a bent valve, causing a bad seal between the valve and the seat, allowing air to slip past lowering that cylinder presure.

Other possibilities are a Blown head gasket (Not uncommon with high millage bikes). Broken piston rings, or excessive wear of the rigns cause ring end gaps to get too large letting to much blow by. Broken Rings or heavily worn rings will be evident by blue smoke in the exhaust from the oil getting by the rings. Blown head gasket can allow coolant to get into the cylinder, or into the oil, making the oil foamy and brown. In either of these three possibilities, the heads will have to be removed. And depending on your findings, a engine overhaul may be needed.

Before pulling the heads however, get a scope that goes in through the spark Plug hole to view the inside of the cylinder to look for scoring, piston damage, etc.

Best of luck

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