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Ok, back to topic, SL synthetic verses SN semi-synthetic, SN is later spec, if it's SN, does it really matter if its synthetic. Both are 5w30 A3B4, same brand, so which is better oil, SN spec, or SL synthetic?

SL synthetic or SN semi-synthetic, which is best, normal service, engine can use either

As an added note, I also get a cross reference for the head gasket as 796584 from the B&S website, however the 794114 is also still available. It appears that B&S 796584 is the correct one, 794114 is listed from ereplacementparts.com and is also listed for other 31 ci engines.

Do you remember if your last gasket had a fire ring or not. The one I used did not, it came out of a valve cover gasket set, (head gasket, valve cover gasket, exhaust gasket, inlet valve stem seal, carby to manifold gasket) The original part no. for the head gasket is 699168, but has been...

If you've got time to ask the question and read the answers you would have changed it already, just do it now, there's lots of other things to do in the spring.

Actually I think is holds the inlet valve open on this particular eengine, when starting make sure the throttle is open, also the valve clearance needs to be set correctly for the release to work correctly. Here is one reference to it, but there are many others with details of how to do it...

Have a read of this thread http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=963775#Post963775 There is no way you will get out of it with some RTV, it is a known problem with these engines.

Originally Posted By: 97 GTP I believe that gasket fits, although you have to file the bore some as it's a little smaller. At least that was the case with my 18HP AVS Intek. So you fitted one of these? Originally Posted By: 97 GTP Also make sure oil level is not too high as these engines can...

As it an older engine and has probably done some work, you may find the valves need the ends ground off them as you probably have no valve clearance anymore. When the valves "ride" combustion gas is blown back down the intake and blows fuel in/out of the carby and makes them very hard to start...

I have blown my head gasket on a 17hp AVS 31ci Intek, replaceed gasket, torqued head, 3 stages, to torque plus 10%, mowed again, very very heavy going, long grass, have blown gasket again, have contacted www.eccarburetors.com to see if their gasket...