Quote Originally Posted by axa View Post
And now a cylinder stud i guess.. but if you read up on these you will find the consensus that home made isnt feasible.
Proper material, treatment and thread formation is out of my capabilities...

- threads should be rolled, i don't have the equipment
- Home brew hardening is vastly inferior to production, (i went through too many home made sprocket studs due to inadequate hardening)

So basically i don't have the experience to know home made will or will not hold up.


So, basically, you are telling me that you don’t have heat treat furnace and Rockwell tester? No way!

Jokes aside, IMO, you could solve problem with missing stud by recycling some similar diameter old stud. It is already hardened, alright, but I am convinced that carbide thread cutter insert would do the job. Even if you don’t have black belt in cross slide kung-fu and you make generous relief groove, you’ll make more than good enough stud. You can even do the trick by thread cutting with lathe turns in reverse and get spick and span stud.


It’ll hold.


Quote Originally Posted by axa View Post
ok Zorge here is the first details of said 'mechanical delicacy'; real motorcycle porn if you ask me

No frame re-tailoring needed – IMO, that’s good portion of job already done. It look to me that also engine is not cramped in the frame, so it won’t te to hard to fit exhaust and carb (on his stock position or this side draft mod you mentioned). In short, this is not the worst engine swap.

Quote Originally Posted by axa View Post
One more thing, when having to change your piston on the 167fmm, note there are interference and non interference fits sold...

Did you try to comb some piston manufacturers catalogs? Do some measuring with Vernier and dig in. I’m sure that you’ll find something that fits.

About those oil holes for gudgeon pin... I know that some designers strive to make fit between pin and piston as tight as possible, so all the wobbling when engine runs, happens between gudgeon pin and conrod’s small end (bushing or needle roller bearing, that is).

...So it’s not a big deal if those holes are omitted. After all, if necessary, you can easy drill those holes.