1980 CB750F valve cover bolt stripped.... plz help!

[spartan8ball]

Hello!

I recently obtained a 1980 Honda cb750f supersport in good shape, with one minor flaw.  Seems an outer valve cover bolt-hole is stripped.  To make matters worse, seems most of the other ones were also stripped and repaired with a heli-coil, however this one stripped the heli-coil as well.  I have a 6mm heli-coil, but the bolt hole is to big to tap for the 6mm, and it uses a special gasket bolt.  I noticed that the bolt resided in a camshaft bearing, not the cylinder head itself, so at least the head is not screwd.... anybody know of a fix other than replacing the camshaft bearing?  (and if not, are the bearings available individually or as a set, how much, and where can I get them from?)

Also, minor question:  The fuel valve, when the bike ignition is OFF, allows fuel to leak out of the carburetors (little nipples at the bottom) unless I manually shut it off.  The bike will also run quite well with the fuel shutoff valve in the OFF position.  I would assume this is a bad fuel valve?

Thank you in advance for your help.  If I can get this thing to stop leaking oil like the exxon valdez, I can get it inspected and share some pictures/experiences!

Thanks,
Chris

[Rod_Knockin]

You could drill larger and get a thread repair insert (hard, not helicoil) be sure to loctite in.
The tank valve is bad as well as your needles in the carbs. I dont remember if you can tighten the tank valve. I can leave the fuel on on my bike with no leaks out the carb.

[spartan8ball]

Thanks for the help?  Any thought on where to get a hard insert?  The auto-parts stores around my place only have them for spark-plug hole sizes...

[Rod_Knockin]

grainger or mc master carr

[spartan8ball]

well guys, its fixed.  I removed the bearing, filled the bolt hole with JB weld, let dry overnight, drilled, tapped, and heli-coiled.  So far its holding.  I'm not impressed with JB weld.  It was tough as metal until I drilled it, at that point it got very flaky.

But at least my head is not leaking oil!!!  thanks for the help!

[julie01]

Even i'm facing the same problem with my bike, i've tried with various methods but failed to repair it. Now i'm left with no other option other than going for a new one. Please do reply if you have any suggestions to rectify the problem.
________________________________________________________________
julie

car auctions

[spartan8ball]

If the JB weld wouldn't have held, my next step would have been to take the camshaft bearing to a machine shop, have them weld it solid and re-drill/tap it there.  If that didn't work (or was too expensive) the only other alternative would be to replace the bearing, although I doubt they are available individually.

[alagoon]

I'm having the same issue. I've got everything working except this last problem. I just tried fixing with heli-coils only to realize it had already been tried on this engine by a previous owner. My next step is going to be http://www.threadtoolsupply.com/m6x1-e-z-lok-thread-repair-kit.html and if that doesn't work, some JB weld or something. Will let you know how it goes.

[TOOLS1]

Those things are nice. I have used them several times.
TOOLS