The KTM300 Thread - Page 51

DougZ73 · 11-22-2012, 04:47 PM

Quote:

Originally Posted by RideFreak

I do the z setting with the rings off, figure out the gaskets and install the rings just prior to final reassembly. I've seen a ring compressor that would work on the 300 (about 1/2" top to bottom) but truthfully once you figure the cyl install out, proper installation takes a couple seconds. Now the piston pin clips are a different story, the stock KTM units are a huge PITA. Why did they go away from the old style that worked with a pair of needle nose plyers.

Yeah I know, the old ones are still available.

My hardest cyl install was a VW waterboxer, seperate cyl liners that fit down into a non removable waterjacket that pretty much blocks all access for a mortal like me.

Damn...that is genius. I should have thought about doing the Z gap setting with out the rings in the piston. That has just changed how I will do top ends forever.

Probably would have saved the issue I have now. ( bangs head on wall)

Thanks for the tip RF.

DougZ73 · 11-23-2012, 02:18 PM

Found where my compression went.

Not 100% sure what scratched it. Rings seemed to be correct spot and not broken at all. Cylinder looks worse than piston too. ????

Sent from my DROIDX using Tapatalk

Wallace · 11-23-2012, 03:00 PM

Looks like a cold seize.

DougZ73 · 11-23-2012, 03:39 PM

Quote:

Originally Posted by Wallace

Looks like a cold seize.

Cold seize?? Please define. I am somewhat new to 2T's, and have never heard that term.

This is piston:

other side:

head seemed to be in good shape:

So, what is opinion on best method to get this fixed?? Powerseal USA weld, rebore and Nikasil again??? Eric Gorr Iron sleeve and overbore( that is what I had on YZ125)???

RideFreak · 11-23-2012, 04:11 PM

It looks like something got caught in there, the grooves look pretty deep for just a siezeure. To me it looks like whatever did that caused the ring lands to lock the rings up against the piston resulting in blowby. It that point it's a lit fuse.

The cyl grooving looks pretty deep, I don't think you'll get away with relining the cyl. I've heard they can can do a weld repair of some types of damage prior to recoating it.

DougZ73 · 11-23-2012, 04:25 PM

Yeah, looking at powerseal pricing now. looks like it will be a weld repair, rehone, and new nikasil coating.

I also just pryed rings off piston. Looked like they were lined up right and pins did not fall out or break off.

Still not sure what caused the really deep scratches.

RideFreak · 11-23-2012, 04:41 PM

Quote:

Originally Posted by DougZ73

Yeah, looking at powerseal pricing now. looks like it will be a weld repair, rehone, and new nikasil coating.

I also just pryed rings off piston. Looked like they were lined up right and pins did not fall out or break off.

Still not sure what caused the really deep scratches.

Was the motor open awhile? It almost looks like something came up from the bottom end, possibly something that fell into the motor. The problem with that scenero is the item in question, is it still there, are there more pieces? The fact that the head looks fine sort of goes against that theory. Usally you'll see where gouges and pits develop in the head if there's something bouncing around in there.

Gordy · 11-23-2012, 04:42 PM

Did you drop something in the bottom when you were in there? Old circlip or something???
It almost looks like something came up through the transfer port.

Just John · 11-23-2012, 05:17 PM

Piston appears to be scored from one side to the other. Like it was too tight to the bore.
Or it got very hot very rapidly.

Was there coolant in the bike ?
Did you heat cycle it ?

RideFreak · 11-23-2012, 05:18 PM

Quote:

Originally Posted by Gordy

Did you drop something in the bottom when you were in there? Old circlip or something???
It almost looks like something came up through the transfer port.

Beat ya to it by 60 sec

Gordy · 11-23-2012, 05:22 PM

Quote:

Originally Posted by RideFreak

Beat ya to it by 60 sec

. At any rate, he might want to find a new mechanic.

Sorry, but that just shouldn't happen to a fresh rebuild.

JTucker · 11-23-2012, 06:27 PM

I've seen powerseal fix worse, that almost looks like a circlip came out but it's obviously still in there. Definitely check the bottom end out for loose parts.

DougZ73 · 11-23-2012, 06:30 PM

Thanks for the support...or lack there of.

The motor was not open for any length of time....only when working on it.

Nothing was dropped in there, as far as I know. No missing parts, clips, etc. Everything is accounted for.

There was coolant in bike. heat cycled, as as I did on the other rebuilds. Only other thing than the previous, those were done in heat of summer, and this was during colder, more recent weather.

Basically, I did nothing different than I did on previous top end rebuilds. Makes it that much more baffling.

HellSickle · 11-23-2012, 07:45 PM

Quote:

Originally Posted by DougZ73

Yeah, looking at powerseal pricing now. looks like it will be a weld repair, rehone, and new nikasil coating.

I also just pryed rings off piston. Looked like they were lined up right and pins did not fall out or break off.

Still not sure what caused the really deep scratches.

Check with Lancourt. I had them weld a deep groove in a cylinder and replate.

Just John · 11-26-2012, 04:55 AM

Is that plug gray ?
W brand piston ?

11-23-2012, 02:18 PM	#752
DougZ73 Lacks Freetime Joined: Oct 2009 Location: NJ Oddometer: 4,913	Found where my compression went. Not 100% sure what scratched it. Rings seemed to be correct spot and not broken at all. Cylinder looks worse than piston too. ???? Sent from my DROIDX using Tapatalk __________________ Skyline Drive 11/2010 , Catskills 2010 trip, Catskills 2011 , Southern TNJT, 2011 WRR/X rear shock adjustment , DZ Moto Photo Bloggin' , Learning photography thread - Ryder Joseph Z. , Born 11/26/12-- the next Adventure begins.

11-23-2012, 03:00 PM	#753
Wallace Seat belt tight babe? Joined: Aug 2005 Oddometer: 815	Looks like a cold seize. __________________ Do you support the sport? How do you give back?

11-23-2012, 04:11 PM	#755
RideFreak Torque Junkie Joined: Apr 2009 Location: County Lockup Oddometer: 3,532	It looks like something got caught in there, the grooves look pretty deep for just a siezeure. To me it looks like whatever did that caused the ring lands to lock the rings up against the piston resulting in blowby. It that point it's a lit fuse. The cyl grooving looks pretty deep, I don't think you'll get away with relining the cyl. I've heard they can can do a weld repair of some types of damage prior to recoating it. __________________ *Chris* VIDEOS

11-23-2012, 04:25 PM	#756
DougZ73 Lacks Freetime Joined: Oct 2009 Location: NJ Oddometer: 4,913	Yeah, looking at powerseal pricing now. looks like it will be a weld repair, rehone, and new nikasil coating. I also just pryed rings off piston. Looked like they were lined up right and pins did not fall out or break off. Still not sure what caused the really deep scratches. __________________ Skyline Drive 11/2010 , Catskills 2010 trip, Catskills 2011 , Southern TNJT, 2011 WRR/X rear shock adjustment , DZ Moto Photo Bloggin' , Learning photography thread - Ryder Joseph Z. , Born 11/26/12-- the next Adventure begins.

11-23-2012, 06:27 PM	#762
JTucker Beastly Adventurer Joined: Sep 2008 Location: West By God Virginia Oddometer: 1,811	I've seen powerseal fix worse, that almost looks like a circlip came out but it's obviously still in there. Definitely check the bottom end out for loose parts. __________________ http://www.ktm-parts.com 03 Aprilia Caponord 06 Buell XB12X 05 XR650R 05 WR450F 87 T-dub

11-23-2012, 04:42 PM	#758
Gordy Team Listo Joined: Dec 2001 Location: NM Oddometer: 18,298	Did you drop something in the bottom when you were in there? Old circlip or something??? It almost looks like something came up through the transfer port.

11-23-2012, 05:17 PM	#759
Just John Gnarly Adventurer Joined: Jan 2009 Location: Pine Barrons,NJ Oddometer: 147	Piston appears to be scored from one side to the other. Like it was too tight to the bore. Or it got very hot very rapidly. Was there coolant in the bike ? Did you heat cycle it ?

11-23-2012, 06:30 PM	#763
DougZ73 Lacks Freetime Joined: Oct 2009 Location: NJ Oddometer: 4,913	Thanks for the support...or lack there of. The motor was not open for any length of time....only when working on it. Nothing was dropped in there, as far as I know. No missing parts, clips, etc. Everything is accounted for. There was coolant in bike. heat cycled, as as I did on the other rebuilds. Only other thing than the previous, those were done in heat of summer, and this was during colder, more recent weather. Basically, I did nothing different than I did on previous top end rebuilds. Makes it that much more baffling. __________________ Skyline Drive 11/2010 , Catskills 2010 trip, Catskills 2011 , Southern TNJT, 2011 WRR/X rear shock adjustment , DZ Moto Photo Bloggin' , Learning photography thread - Ryder Joseph Z. , Born 11/26/12-- the next Adventure begins.

11-26-2012, 04:55 AM	#765
Just John Gnarly Adventurer Joined: Jan 2009 Location: Pine Barrons,NJ Oddometer: 147	Is that plug gray ? W brand piston ?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: .
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode