Topic: SOHC3 part 2

[carsholduptraffic]

ok. now the motor is out. no carnage in the valve gear, no obvious wear marks etc. barrels came off with the head, and by that stage i'd already started adding up the gaskets and rubber bits i'll shortly need. rings are ok, but the oil rings are gummed a bit, though spring out a bit with a touch.
yet to seperate the barrels and head, but the base gasket was a casualty in the operation. replace. the rubbers in the top end appear fresh (this is a 100000km motor) but at this point, i see no reason for it to run on 3. i suspect it was carbs all along, they were the bits i last fiddled with.
so now that it is in bits, tell me if doing the things like polishing the rocker arms willgive me any gains.........and point me in the direction of NO oil leaks on a 836 motor. is it an impossible dream??
(i consider oil stained jeans par for the course these days)
nick in canberra

[eldar]

well I dont think polishing you rockers will do much but look pretty on the table. Now polishing the head can sometimes help. With an 836, if you have good seals, you should not have any oil leaks. Since you did not go through the cylinder walls. I dont know what you have know, but maybe port and polish the head and valves. Depending on piston wear, maybe a new set, possibly slightly oversized to bring tolerances back up. Get your crank polished up. The net gains from all of this probably will not be that much though.

[cben750f0]

mate i dunno what is is with the 836 kit, but my head leaks two, and its on its second head gasket, and the head got retorqued after 600km?.... which ment i had to take the motor out of the frame.... if you find the secret let me know ...peace

[eldar]

have you all tried to make your own gaskets? The standard gasket kits were made for a regular cb750 not an 836. Since there is a substantial power increase, the regular gaskets are probably not going to hold up well. My idea to you guys is to get a thick sheet of high temp rubber or something that will withstand the engine heat, use your current gasket as a guide and cut out your own gasket. This should work much better than a fiber or paper gasket and be reusable. Or you can even try to use high temp silicon sealer to make a gasket. I have done that on car engines and it works great. At the least, give it a try, the most you lose is the cash to buy the gasket you would have to buy anyways.

[Gordon]

Silicone is a big no-no with these engines.  If just a tiny amount gets into the engine, it will clog up the oil passageways. 

[eldar]

well that is with any engine. The trick is how you do it. If you apply it, then let it dry for a while then put the head on, IT will squash the silicon but it will not break apart. This may not work the best in high torque areas though.