Early Cylinder base gasket

Buck · Post by **Buck** » Thu Jun 22, 2006 7:23 pm

What is the difference in the early base gaskets for CB77 ? My 62 is a low serial number and the parts book lists #12191-259-000 for up to CB77E-210900. After that you use#12191-259-010. The gasket set I am using looks correct with the oiling hole at the front left of the cylinder but I want to be sure before I use it. Thanks,Terry Mitchell

joeweir1 · Post by **joeweir1** » Sun Jun 25, 2006 3:27 am

If your referring to the oblong oiling hole the later models do not have this.I ordered a gasket set for my CA77 off Ebay and I did not realize there was an old style and ended up with a gasket set that only a few gaskets fit on my newer style engine.I did not have anyhting to compare it to.Live and learn.

LOUD MOUSE · Post by **LOUD MOUSE** » Mon Jun 26, 2006 8:25 am

The early cylinders had 8 holes and then the later (most are this way) have 9 holes. If ya use the 8 hole gasket on a 9 hole top case you will have OIL come out!. ..........lm

quote="joeweir1"]If your referring to the oblong oiling hole the later models do not have this.I ordered a gasket set for my CA77 off Ebay and I did not realize there was an old style and ended up with a gasket set that only a few gaskets fit on my newer style engine.I did not have anyhting to compare it to.Live and learn.[/quote]

Buck · Post by **Buck** » Mon Jun 26, 2006 7:31 pm

Thanks for the help guys. My 62 has the eight stud holes and the round oiling hole on the front left of case. Beware the aftermarket head gaskets. Put one on my bike and the pistons hit the sealing ring. CB77's are 60mm bore and new gasket measured 59.5mm. Old head gasket measured 60.5mm I.D.. I will use OEM head gaskets from now on. My early 62 is almost finished. Will post Pics soon. Terry(Buck)Mitchell

joeweir1 · Post by **joeweir1** » Tue Jun 27, 2006 6:55 am

Buck Where did you get the aftermarket head gasket?Just so we do not get the same one.If you got it from Ebay could you tell us who the seller was so we avoid them. thanks

Buck · Post by **Buck** » Tue Jun 27, 2006 10:35 am

The gasket set I used was bought at a swap meet. It was an old Self Cycle & marine set. They are marked (SCM) in an oval. Assembled engine and fired it off,Whoa! cut it off quick!! Checked valves and everything else,nothing shows up. Out with the engine & off with the head and after looking at everything I noticed the head gasket move when pistons came to top. Measured opening in new gasket and old one and found the problem,60mm bore with a 59.5mm gasket. Live &learn. Always use OEM whenever you can. Buck