NSR - ALSO black carbon deposit, but more like chalk...

NSR125-Kid-UK · Attention Whore Joined: 03 May 2003 Karma :

I was checking the bike over and noticed that there's a layer about 1mm thick around the inside of my exhaust, of black charcoal greyish powder. I scraped some out with my key and it's got the consistency of chalk.
It's just dry powder and there don't seem to be any oil deposits in the exhaust...

Anyone know if that's unburnt oil, or if something's wrong with the engine?
____________________
https://www.bikepics.com/members/nsrandy/96rs250/ My Bike!

"I'm either going to teach andy to get his knee down, or I'm going to get him killed. One of the two" - Teaman

Hex · Party Boy Joined: 04 Feb 2002 Karma :

Soot from the normal exhaust gasses.
____________________
The BCF's very own Party boy! Though he's getting old and feeling it!
Monkey hanger, Born and bred
My little photo portfolio

NSR125-Kid-UK · Attention Whore Joined: 03 May 2003 Karma :

Normally there's some oil in the exhaust - does this mean that my bike's running leaner than it normally should or is it just cos of the hot weather or something? Confused

____________________
https://www.bikepics.com/members/nsrandy/96rs250/ My Bike!

"I'm either going to teach andy to get his knee down, or I'm going to get him killed. One of the two" - Teaman

Stevie B · Crazy Courier Joined: 22 Apr 2005 Karma :

Probably means you need a rebuild (piston and rings) if there is oil in the exhaust because it sounds like theres oil getting past the piston, not good!

Steve

NSR125-Kid-UK · Attention Whore Joined: 03 May 2003 Karma :

I bloody hope it doesn't mean I need a rebuild - It had one less than a thousand miles ago.
____________________
https://www.bikepics.com/members/nsrandy/96rs250/ My Bike!

"I'm either going to teach andy to get his knee down, or I'm going to get him killed. One of the two" - Teaman

alains · World Chat Champion Joined: 08 Jul 2004 Karma :

clean the exhaust & exhaust chamber on the barrel . then have a look on your oil pump . adjusting it , is very easy (open the cover , put your handle at max throttle and look if the notches are on line , if not use the adjuster on the cable) . could be also a bad spark , fit a BR9EIX
____________________
the worst day fishing is better than the best day working

mr jamez · World Chat Champion Joined: 04 Aug 2003 Karma :

Stevie B · Crazy Courier Joined: 22 Apr 2005 Karma :

What i was getting at was that i wouldn't expect to see a load of unburnt oil in the exhaust, i assumed there was only the carbon deposite left in there?.... in which case, as has already been mentioned, decoke the exhausut....

Steve

mr jamez · World Chat Champion Joined: 04 Aug 2003 Karma :

Unburnt oil and petrol will come out of the exhaust as some of the mixture escapes through the exhaust port when a fresh mixture is drawn in, also not all of the oil gets burnt, it is a brown tar like substance by the time is is spitting out of the exhaust.

ZaphodBeeble · World Chat Champion Joined: 10 Feb 2004 Karma :