R5 Autopsy

[Czakky]

If you missed the second part of my "Coil Question" thread here's a quick synopsis.
My bike was losing power I ordered the Econ Cycles OEM style coils. Second ride after about 4-5miles it died. I noticed an airgap on my clear oil injector lines. Filled the tank with 32:1 or better. After a very careful easy ride home just before my driveway it died again. A couple days later I started it again and verified the oil pump wasn't pumping.

All things seem to point to an oil seizure followed by a lean seizure, right?

One thing I neglected to mention was that my fuel tank was full of a light mixture due to replacing the oil injector lines. Say 100:1 or less.

So today I took off the cylinders and the results don't look like what I've seen from seizures. I am no expert of course. What do you guys think?

[Czakky]

Looks like some ugliness on the intake side and a bit of charge getting past the rings but I'm not sure what else.

[AAAltered]

I had a similar situ some years back with a kinked oil line.  I *smelled* the overheated barrels at a stop lite.  I found similar seize evidence when I took off the top end...   In my case, I cleaned it up and ran it till the next "big one" which came some time later with a twisted rod...

[SUPERTUNE]

Looks like the right side got some minor scuffing, but not a issue as far as a seizure. I would take off the piston, buff it with red fine scotchbrite then wash and re-install.
Re-use the clips just be very careful taking them out and then pull on it to stretch it a little and put it back in...done many racebikes for years re-using clips.

Chuck

[Czakky]

So it must not have seized?
Since I need new base gaskets I think I'll just grab fresh clips anyway. Hopefully I'm back to ring-dinging next weekend.
Thanks once again Chuck!
Your inscription is still very legible in the heads!

[SUPERTUNE]

You might have a hard time finding those clips as they're specific to that HVC branded piston.
OEM, pro-X and wiseco/wossner (same) are ALL different than these.

C

***Added to clarify...

[Czakky]

D'oh!

[quocle603]

Your rings are still there, thats not a major seizure. Clean up and blast away 

[Czakky]

In case anybody is looking HVC does stock wrist pin clips for there R5 pistons.

Speaking of wrist pins. I don't remember having any trouble removing the old wrist pins. These slide a few mm but just stop in there tracks dead solid. Can't budge em...

I'm trying to re use the pistons...

[Hawaii-Mike]

Buy a piston pin puller.  Don't force the pin out, you might bend the connecting rod.

[Czakky]

You're probably right, will do.

[quocle603]

How does the cylinder(s) look?

If you have the top end off, you might as well put new gaskets in the thing. If you want to do a little more, then I would replace your rings and hone the cylinder while its already out.

[Czakky]

Head gaskets annealed and base gaskets on the way.

[SUPERTUNE]

He won't need new rings... This is a TEAM SCREAM RACING built topend that doesn't have that many miles on it, so I know they're not worn out or needing honed out any bigger to sacrifice piston clearance life in the cylinders. I use special sunnen industrial grit honing stones to get long life out of my bore jobs.

If he would have had a major seizure...it would be different plan.

Piston pins can hammer back and forth in the pistons and cause the clip grooves to get peened up, so yes... a piston pin puller needs to be used when that happens. Buy a small one as these are only 16mm pin diameter.

Chuck

[Czakky]

You'd think an engine builder would be pushing for a rebuild, etc. Chuck is a class act though helping to find a cost effective way to solve this problem.