Fast Eddie wrote:I've got a couple of different thickness of copper head gaskets coming from JS so I can fiddle with squish gap. I don't intend to use anything on the barrel base apart from Wellseal. I intend to use the .005" copper wire loops around the pushrod tunnels and oil drain hole along with the copper head gasket.
I just have to decide what goo to use. JS swears by plybond. Matchless has an oil tight Maney 920 using BMW silicone sealant, 2 tubes of which I have on the shelf. And I have always had good results (but not used on the head/ barrel interface) with good old Wellseal. I don't want to be pissing around taking the head off to fix oil leaks...!
Yeah, we all have our favorite magic goo, don't we? Ron Wood turned me on to using Pliobond on copper head gaskests years ago, but I've also used pretty much every other goop there is at one time or another, from spray on aluminum paint to Yamabond. The latest 883 engine I did I used a copper head gasket with .005" wire set in Hylomar around the pushrod tunnels and oil drain hole (and it still weeps oil). They mostly all leaked some oil eventually. Jim Comstock suggested a high temperature pipe jointing compound, but I haven't had a chance to try that yet. The only engine I recall not having oil weeps was the stock 750 in my first Commando, a Production Racer that I only used stock flame ring gaskets in. Once I started modifying the engines for higher compression and bigger bores, I don't think I ever had one that didn't eventually start showing some oil around the head and cylinder fins at the joint. I think using a reed valve crankcase breather will probably help a lot, but I don't have any significant experience with that yet. Using Jim's waisted ARP head bolts should also help, but I don't have any experience with that yet either. Always something new to try.
I'm really intrigued by Jim Comstock's latest gasket free technique, and looking forward to seeing how it holds up to his high mileage riding.
So, is the gasket goo topic now up there with the infamous oil and tire threads on the list of perpetually repeating topics?