1995 GSX-R 750 rebuild options??

Hey guys I have a 1995 GSX-R 750 and to my dismay, the timing chain
came loose during a ride. One of the exhaust valves was pushed through
the piston in the third cylinder, and nearly all of the tappets topping
the exhaust valves are cracked and scattered about the top end. I guess
my question is how much do I need to replace? Should I simply buy new
exhaust valve assemblies and a new piston? Should I replace the entire
top end? The cam shafts appear to be solid and straight, could I get
by with just replacing the valve assemblies? And as for the bottom
end, could I replace the piston and rings on the third cylinder without
having to rebuild all four cylinders? I am new to this so any advice
would be appreciated - Thanks

 

Your going to quickly find when you start calling around to bike
wrecking yards that you can get a running engine for that bike for
probably a lot less than it would cost in parts to rebuild what you
have.

Get yourself a used engine, and when that engine dies, you can
take both engines and probably mix and match parts between them
to get a running engine.

Ted

 

*Ding* for the most sensible posting of the week so far.

 

Huh? How would the tappets get out from under the camshafts? The
tappets are inverted metal cups, sliding up and down in a hole.

What is an "exhaust valve assembly"? An exhaust valve is exactly that,
a valve.
The valve springs, valve retainers, and valve keepers are separate
parts, they are not part of any "exhaust valve assembly".

Valves are very expensive, each one will probably cost you $20 and
there are 16 of them. it wouldn't be cost effective to replace valves
that didn't need replacing.

This is where you use the information from your Genuine Suzuki shop
manual to
measure all the parts with a micrometer and check every valve for
straightness with a dial indicator while rotating it in a V-block.

Son, the "entire top end" consists of cylinder, cylinder head, four
pistons with their rings, four wrist pins with retaining clips, two
camshafts, sixteen tappets, sixteen valves, sixteen valve springs,
thirty-two keepers and all associated seals and gaskets, as well as the
cam chain tensioner, rub blocks and cam chain.

All those parts would cost you thou$ands of dollar$. And the part$
counter dude would $mile as you forked over all that ca$h.

Use your Genuine Suzuki shop and a dial indicator to determine
camshaft straightness, as you rotate the camshafts in their journal
holders.

Now there's a false economy. If you have gone that deep into the
engine, why not replace ALL the piston rings?

OK, major piece of advice, if you're going to remove the camshafts to
replace those
tappets that are mysteriously scattered about: When you re-install the
bolts that hold the camshaft journal holders in place, the bolts must
be DRY, no oil and the same goes for the holes they screw into.

If you try to follow the factory manual torque specifications with oily
bolts, you will break the bolt or strip the threads before the torque
wrench ever clicks.

Don't ask how amateur mechanics know that.

There are about a bazillion of those Suzuki oil/air-cooled engines
around. You should have little problem obtaining used parts or complete
engines.

Problem is, which parts/engines are any good?

 

Thanks for the advice, I will start the search for a used engine.