Do I need to find a replacement upper case?

cyclon36 · Post by **cyclon36** » Fri Apr 01, 2011 9:24 pm

I always wondered what that little mount was for. I have a CB77 block with one and one without one.

BTW, I have two spare engine cases if you should want one

zoom · Post by **zoom** » Sat Apr 02, 2011 6:38 am

Can someone measure the height of that thing and the height of the hole.
Thanks

ricksd · Post by **ricksd** » Sat Apr 02, 2011 5:57 pm

It's 25.5mm tall, 19mm to center of the tapped hole, and tapers to about 14mm diameter through the tapped hole.

Impurities make welding cast aluminum a little unpredictable, but a MUCH better option than epoxy putty and JB weld.
If you can machine a nice flat surface at the top of your broken boss, you could drill an tap a hole in both the case and a new boss- made from a chunck of aluminum, and use a long set screw as a sort of blind 'stud'.
I sent you a PM, I live fairly nearby and probably have a spare crankcase.
Rick

zoom · Post by **zoom** » Sat Apr 02, 2011 6:05 pm

Thanks, I'am making a new one. Thats what I needed, nice Pic. Hope it works or it'll be a new upper case. Another member has offered one up in case. Thanks everyone

Dr. Frankenstein · Post by **Dr. Frankenstein** » Sat Oct 15, 2011 8:00 am

Interesting...my 'early model ('62, I believe) has the same piece missing...I always wondered what that was for! Glad to know I can live without it!