View unanswered posts | View active topics It is currently Wed 18 Oct, 2017 1:42 pm



Reply to topic  [ 34 posts ]  Go to page 1, 2, 3  Next
 Chipped piston severe oil leak 
Author Message
TRAIL YOBBO

Joined: Tue 09 Dec, 2014 12:24 pm
Posts: 21
Post Chipped piston severe oil leak
Hi guys,
Gave my bike a clean today just to find out where oil is leaking from after cleaning I started her up and straight away oil starting dripping down from the exhaust port also noticed air/smoke escaping from the flange meaning the exhaust is not sealing to the flange,

So I pulled her apart again tightened all the bolts as I was doing this I peaked inside the cylinder and noticed a chip on top of the piston (see pictures).

Also bike won't hold idle very long maybe 30secs and sounds like it's running with a miss once moving runs great though no loss of power just slightly sluggish down low.

I'm sure these two problems (oil leak/chipped piston) are probably not related I'm just after any advice on what to do Thanks.

Sorry about the sideways pics not to sure why it done that.

Attachment:
20141211_144000.jpg
20141211_144000.jpg [ 63.54 KiB | Viewed 2156 times ]


Attachments:
20141211_141538.jpg
20141211_141538.jpg [ 78.9 KiB | Viewed 2156 times ]
20141211_141538.jpg
20141211_141538.jpg [ 78.9 KiB | Viewed 2156 times ]
Thu 11 Dec, 2014 2:58 pm
Profile
TRAIL PORN STAR
User avatar

Joined: Thu 16 Jul, 2009 7:08 pm
Posts: 3159
Location: Rio Brisbanero
Post Re: Chipped piston severe oil leak
Whats the make and model of the bike mate dontknow

Can,t see a powervalve in there , which is what usualy chips a piston in that spot , could actualy be a manufacturing arrow to show correct piston direction ( although i doubt it )
Exhaust should be an easy fix


Thu 11 Dec, 2014 5:06 pm
Profile
TRAIL YOBBO

Joined: Tue 09 Dec, 2014 12:24 pm
Posts: 21
Post Re: Chipped piston severe oil leak
Hi thanks for the reply it's a 96 300 exc


Thu 11 Dec, 2014 9:56 pm
Profile
TRAIL BOSS
User avatar

Joined: Sun 05 May, 2013 3:12 pm
Posts: 341
Post Re: Chipped piston severe oil leak
looks like more than just one jagged edge / chip there.
I can see a few more - but they might just be casting edges -
so whats the bore look like?
Personally after 3o yrs of 2 strokes ive never seen a piston look like that before and that would bother me personally!
but they have all been Kawasaki or Suzuki,s
And if you dont know its history maybe its time to do a top end and the only one way is to take the head off - depends if you want to keep the bike?
It only takes a couple to 3 hrs work at best and maybe a couple 100$.
So when in doubt start at fresh = New piston rings little end and start there. call it a summer project :headbang

_________________
300cc of yehaaaa!


Thu 11 Dec, 2014 10:32 pm
Profile
TRAIL YOBBO

Joined: Tue 09 Dec, 2014 12:24 pm
Posts: 21
Post Re: Chipped piston severe oil leak
Yeah that's what I was thinking a new top end never hurts especially with a funky looking piston like that.

I know nothing about the history of the bike just picked it up last weekend still starts first kick and runs fine plenty of power just sounds a little rough on idle I'm putting that down to the exhaust not being sealed.

The guy I brought it off said he looked after it with regular services but nothing about rebuilds as he only owned it for under a year and didn't get out on it very often, there was nothing that alerted me that something was wrong I just spotted the piston when taking the expansion chamber off to inspect the oil leak, about that does anyone have any idea where the oil is coming from surely it Shouldent puke that much out the port?

Cheers


Fri 12 Dec, 2014 1:01 am
Profile
TRAIL BOSS
User avatar

Joined: Sun 05 May, 2013 3:12 pm
Posts: 341
Post Re: Chipped piston severe oil leak
I get a fair bit of spooge coming out from my rmx 250 pipe where it meets the barrel.
found the rubber gasket had worn through.
your pipe might not be the correct one ? larger diameter
or a dose of silicon works well as a gasket?
yas just got to redo it every time you remove the pipe?
good luck - 2 strokes for eva!!!

_________________
300cc of yehaaaa!


Fri 12 Dec, 2014 6:13 am
Profile
TRA Sponsor
User avatar

Joined: Wed 15 Jul, 2009 7:45 pm
Posts: 241
Location: Glasshouse Mtns
Post Re: Chipped piston severe oil leak
Jake,

When running, does your exhaust smell sweet like a 2 stroke? Or does it kind of stink a bit?

_________________
Suspension Matters
www.suspensionmatters.com.au
Ph. 041-REVALVE


Fri 12 Dec, 2014 11:16 am
Profile
TRAIL YOBBO

Joined: Tue 09 Dec, 2014 12:24 pm
Posts: 21
Post Re: Chipped piston severe oil leak
Hi mate,
It smells extremely sweet I can pretty much taste it,
I was going to post this but dident want to sound like an idiot lol.
I adjusted the air/fuel mixture today, after this the smell wasn't as strong and it didn't smoke the garage out as it usually does.
I don't have a great deal of experience with 2 strokes the last I owned was a suzuki ts185 which was pretty much bulletproof I dident play around with it to much


Fri 12 Dec, 2014 10:41 pm
Profile
TRAIL YOBBO

Joined: Tue 09 Dec, 2014 12:24 pm
Posts: 21
Post Re: Chipped piston severe oil leak
So checked compliance plate today it's a 95 model,
Can anyone tell me if the engine and carb are the same for both 95 and 96 models.
All top end kits and carb rebuilds I can find are for a 96 can't find anything on the 95's


Mon 15 Dec, 2014 10:13 pm
Profile
TRA Sponsor
User avatar

Joined: Wed 15 Jul, 2009 7:45 pm
Posts: 241
Location: Glasshouse Mtns
Post Re: Chipped piston severe oil leak
Jakew wrote:
Hi mate,
It smells extremely sweet I can pretty much taste it,
I was going to post this but dident want to sound like an idiot lol.
I adjusted the air/fuel mixture today, after this the smell wasn't as strong and it didn't smoke the garage out as it usually does.


The sweet smell is good, that rules out crank case seal issues. I'd say the bike is just running rich and the adjustment you make to the air screw seems to have confirmed this.



Jakew wrote:
So checked compliance plate today it's a 95 model,


Generally most bikes manufactured after June in a particular year are actually the following years model. What is the build date of your bike? You can also ring a KTM dealer and give them your VIN and they should be able to confirm which year it is.

_________________
Suspension Matters
www.suspensionmatters.com.au
Ph. 041-REVALVE


Tue 16 Dec, 2014 8:35 am
Profile
TRAIL YOBBO

Joined: Tue 09 Dec, 2014 12:24 pm
Posts: 21
Post Re: Chipped piston severe oil leak
Called ktm Australia they confirmed its a 95 model this will make things a little more difficult.
Thanks for helping rule out the crankcase seal.
Does anyone know anywhere in Aus that stocks older ktm parts I'm also after a service manual for a wiring diagram as I'm looking at road registering it,

I can find a carb kit for it but no top end kits I'm doing the carb just for peice of mind I'm not in a real hurry to do the top end as there's nothing major troubling me when riding.

My biggest worry is a metallic tapping sound coming from just behind the expansion chamber rhs of engine I'm pretty sure it's coming from the powervalve cover is this a common problem? The sound wasn't there untill I changed the spark plug it is the exact same model plug so I cant see any reason why a new plug could cause this.

Thanks


Tue 16 Dec, 2014 11:41 am
Profile
TRAIL BOSS
User avatar

Joined: Sun 05 May, 2013 3:12 pm
Posts: 341
Post Re: Chipped piston severe oil leak
Any knocking tapping is worth looking inside the head / bore / powervalve? dontknow
I didnt see one? maybe the little end is tappin.

if it goes bang all that time youve allready invested goes down the gurgler. BangHead
you never know whats really goin on in a motor that you dont know the history of untill you strip it down.
and parts are obviously rare?
Plus Its a real pain trying to get a detonated bike outa the bush / valley / hill climb so honestly - Why risk it mate -
Personally after blowing up several 2 strokes in my younger days id be dubious to go out with it and be stuck with you
all because you didnt do the intelligent thing? if it goes bang it aint worth rebuilding.

FYI last year I compression tested my rmx 250 and it was well within the tollerences but when i took it apart the piston slap was wayyyy out and i suspect not too far off shattering in the bore.
So I installed new piston rings + little end and base gasket was under OZ $250.00 delivered via ebay from the us!. icon_salut
good luck!

_________________
300cc of yehaaaa!


Tue 16 Dec, 2014 12:34 pm
Profile
TRAIL BOSS
User avatar

Joined: Sun 05 May, 2013 3:12 pm
Posts: 341
Post Re: Chipped piston severe oil leak
95 ktm 300 piston kit on ebay OZ $ 200.00

http://www.ebay.com.au/itm/KTM300-SX-WO ... 2a29487760

_________________
300cc of yehaaaa!


Tue 16 Dec, 2014 12:54 pm
Profile
TRAIL YOBBO

Joined: Tue 09 Dec, 2014 12:24 pm
Posts: 21
Post Re: Chipped piston severe oil leak
Thanks for the link mate,
The sound is not extremely loud you can't really notice it till you put your head down near the engine it is consistent though, it just has me stuffed how it happened so quick. I started the bike let it cool no problems with ticking sounds at all pulled the expansion chamber off replaced spark plug chucked it all back together started her up and the sounds been there ever since.
I did some research and there pretty famous for a noisy clutch but it has no effect when I engage the clutch the next thing to pop up was the powervalve so I'm just wondering if there is an easy way to check it? It's definatly not banging like piston slap it's more clicking I'll see if I can upload a clip to YouTube and post it here to view.

I won't be riding the bike till the rebuilds done just starting her up in the shed when doing other work on it.

Thanks again


Tue 16 Dec, 2014 2:06 pm
Profile
TRAIL YOBBO

Joined: Tue 09 Dec, 2014 12:24 pm
Posts: 21
Post Re: Chipped piston severe oil leak
Here's the clip
https://m.youtube.com/watch?v=0Thhk330DhE

I put it in the shed for the recording to amplify the noise.
When in the open its not nearly as loud.


Wed 17 Dec, 2014 6:28 pm
Profile
Display posts from previous:  Sort by  
Reply to topic   [ 34 posts ]  Go to page 1, 2, 3  Next
support our sponsors Servicing Australia
Info on how to become a sponsor here. Full directory listing of sponsors here.



Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron


Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group.
Designed by STSoftware for PTF.