ADVrider

Go Back   ADVrider > Bikes > Thumpers
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 05-11-2013, 10:58 PM   #1
b737jets OP
Baja Explorer
 
b737jets's Avatar
 
Joined: Jun 2005
Location: Big Bear City Ca.
Oddometer: 162
LC4 Piston Issue

I just purchased a 2002 Adventure which had a few engine issues from the previous owner mostly clutch and bearing stuff as far as I was told. anyways after getting it rideable again and I started to ride it and it was puking excessive oil in my airbox. Did a leakdown check and it was at 40% yikes anyways open heart surgery revealed a broken compression ring and this damage. I have never scene anything like it anyone else out there scene it before

b737jets is offline   Reply With Quote
Old 05-12-2013, 03:20 AM   #2
tHEtREV
tEAM iDIOT
 
tHEtREV's Avatar
 
Joined: Apr 2007
Location: Middle Park, Brisbane, Australia
Oddometer: 6,867
I saw it on a KLX250 once...

Had between 55 and 60 000 Klm on it, but the damage was much more severe than that.
__________________
tEAM iDIOT.

KDX Super Fan!

My Spot HERE (active and on a trip).
tHEtREV is offline   Reply With Quote
Old 05-12-2013, 11:26 PM   #3
bmwktmbill
Traveler
 
Joined: Jul 2005
Location: Traveler
Oddometer: 4,731
Jets,
Does this look familiar?

Did your head gasket blow(mine did twice in the same place above the notch)?





IMHO at some point in time my machine got hot and the ring broke, leaking compression did the rest.
I blame the PO.

Again IMHO.

BTW my bore had a few scars and some stuck aluminum that I removed gently, then I used fine emery wet/dry to smooth the scars and break the glaze on the chrome...I just stirred it up a very little. emery on a sponge. Put in a new piston, ran like gang busters but oil in the airbox got worse and worse.

Well I was in Panama so first I rode home to the USA and then pulled the head off when I got back and couldn't stand the mess. I redid the guides and seals, reground the valves... used my local auto machine shop.

Now all is well. Running strong and no oil blow by.

Running premium fuel these days(used to run regular before(Ok so maybe that did it??).

Anyway you will enjoy the return of POWER.

FWIW I rarely run under 4000rpm now.
No more lugging for me.
The engine loves to rev and I am running 17/42 gearing so it's drop the clutch and go.
bill
__________________
'02 KTM 640 Adventure-lowered
"On the road there are no special cases."
Cormack McCarthy-The Crossing

The faster it goes the faster it breaks.
And high performance=high maintenance.
Bill Shockley

bmwktmbill screwed with this post 05-12-2013 at 11:48 PM
bmwktmbill is online now   Reply With Quote
Old 05-12-2013, 11:40 PM   #4
oldxr
Beastly Adventurer
 
oldxr's Avatar
 
Joined: Jan 2007
Location: central komifornia
Oddometer: 1,062
Make sure it is not to lean.If you bought it used from a high altitude area and it was tuned for altitude and you brought it down to sea level there could be a jetting issue.Or a cooling system problem.If you have a local bike shop with a good dyno operator with a/f printout on a dyno run I would head there after break in.That piston got hot.Even something as stupid as a partially plugged fuel filter could cause this under a sustained high load condition.
oldxr is online now   Reply With Quote
Old 05-13-2013, 10:07 PM   #5
b737jets OP
Baja Explorer
 
b737jets's Avatar
 
Joined: Jun 2005
Location: Big Bear City Ca.
Oddometer: 162
Wow that's crazy almost the same thing except no blown head gasket as far as I know. the guy I bought the bike from went to Chile, Peru, Argentina. When i got the bike I cleaned the carb cause bike had not ran since 2008 upon return from So. America, the Carb was uber lean on idle circuit 1 turn out and the rest of carb set up was ok for the most part main was 162.5 the pilot jet 45 but the needle was only on 2nd clip and on tear down the whole intake downstream from throttle had this crazy tan buildup almost like a clay layer weird.

b737jets screwed with this post 05-14-2013 at 05:04 PM
b737jets is offline   Reply With Quote
Old 05-14-2013, 12:03 PM   #6
Luke
GPoET&P
 
Luke's Avatar
 
Joined: Aug 2004
Location: Idiotville, OR
Oddometer: 4,035
Mine did about the same. I blame the thin L-shaped rings. They break and then a little broken bit wears out a hole like a pebble in a riverbed.

I put in a Wossner piston which has regular rings, re-nicasil'd the liner and it has been better than stock ever since.
Luke is online now   Reply With Quote
Old 05-14-2013, 05:03 PM   #7
b737jets OP
Baja Explorer
 
b737jets's Avatar
 
Joined: Jun 2005
Location: Big Bear City Ca.
Oddometer: 162
Yeap Luke that's what im doing too... Wossner and Recoating the cylinder
b737jets is offline   Reply With Quote
Old 05-14-2013, 07:54 PM   #8
bmwktmbill
Traveler
 
Joined: Jul 2005
Location: Traveler
Oddometer: 4,731
Quote:
Originally Posted by b737jets View Post
Yeap Luke that's what im doing too... Wossner and Recoating the cylinder
Maybe just hone the cylinder? Your piston looks good in the sense that it never stuck.

Take a good look at the cylinder head while it's off.

b
__________________
'02 KTM 640 Adventure-lowered
"On the road there are no special cases."
Cormack McCarthy-The Crossing

The faster it goes the faster it breaks.
And high performance=high maintenance.
Bill Shockley
bmwktmbill is online now   Reply With Quote
Old 05-15-2013, 09:38 AM   #9
Droptarotter
Beastly Adventurer
 
Joined: Jul 2007
Location: Cloverdale
Oddometer: 1,124
You are lucky you are only dealing with a one cylinder engine with this.

My buddy's vintage XKE did the same thing........but.....the little piece of ring managed to bounce around in the one cylinder it came from.........then exited out an intake port and proceeded into the next cylinder where it did in that set of piston/valves.

Next up was a broken aluminum bell housing.......but that is another story!!!

Some people have all the luck!

Cheers
__________________
HP2 Sport, R1200S, R100S, KTM 640 Adventure, KTM 520 EXC/Motard, Yamaha RZ350, Hodaka 125 Wombat
Droptarotter is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 11:06 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014