yics cover

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You left it idling for 30 minutes?...it probably overheated, and was starting to puke out oil.

Prolonged idling of any air-cooled engine is a very bad idea.

You might want to run a compression test. Expect some bad news.

 

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Very low compression. Possibly a blown engine. Cross you fingers and hope for the best. Air cooled engines should only be warmed up for, say, several minutes and then they need motion for cooling. I see you're in NY, so maybe the cool outside air may have saved you, but it's rarely a good idea to allow ANY engine to simply idle endlessly if it can be avoided. ESPECIALLY an air cooled one with carburetors. Good luck.

Tim

 

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If it seems to be running OK, no smoke, etc you're probably OK. The acid test will be getting out on the raod and see if she's not low on power etc.

 

I'd say it is probably ok but no wonder the thing was smoking off the valve cover.
Yes, it's ok to warm it up, 30 min was more like forgotten!

That engine needs air moving across it to pull the heat off of it.

So...... lesson learned....... we hope.

That gasket is fairly easy to replace if you use the right adhesives and do it correctly, there is a thread in here somewhere on changing that gasket.

I'd look it up for you but it sounds like you could use some time in the XJ site looking around.

 

Low compression, likely due to a combination of unhappy exhaust valves, crispy 1st rings, and cylinder bores that no longer quite match their original round shape.

If you're really having a bad Karma Day, add a warped head and rubberized internal parts that have been cooked far beyond well done....

Because it may save you a long push home, or worse.

Running an engine without its' cooling system for any length of time tends to be expensive. Starting up an engine that's put away for the winter "just because I like to hear it run" is equally unwise. You're not doing the powerplant any favors by waking it up in the middle of winter.

If you can't get it fully warmed up by riding it for half an hour or so, don't start the engine.

 

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The H shaped cover on the top of the engine that says YICS is the valve cover. Mine also leaks. After a run on the freeway I get a lot of smoke from oil cooking off the heads.

The other day I got the carbs back on and fired her up to warm up to adjust mixing screws. Probably ran for at least 1/2 hour. There was absolutely no sign of oil cookage. In other words, the engine was lots less hot idling in the barn at 32deg for a half hour than it gets on a one mile 70mph run at 60deg.

I seriously doubt you did any harm.

Next job for me is to check the valve shims and replace the cover gasket.

 

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hey there again do i need to pull the engine to replace the yics cover gaskets?

 

no

 

No. And there's a simple way to do it once ... look in the archives ... use the SEARCH function ... type-in "Elmers Glue"

 

I just did mine yesterday, used RTV to mount the seal to the cover. In a few weeks I should be able to get my fingers apart :wink:

On mine it is necessary to remove the horn and get the ignition wires out of the way. Next time I will also take the enrichner cable off the carbs.

I believe yours will be like my 650, with rubber donuts on the bolts that hold the cover down. The bolts have a shoulder that contacts the head - meaning the donuts provide the force that holds the cover tight. I recommend replacing the donuts also (I think mine were $1 apiece).

While you're in there you might want to go ahead and check the valve adjustment.