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Old 29-04-2017
Kirky Kirky is offline
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Join Date: Jul 2014
Location: Buderim
Posts: 54
Fuel Smell in Oil

Just dropped the oil in my 2015 300 SEF-R Factory and the oil smells like petrol. Doesn't feel too bad (still slippery) when pressed between fingers. Anyone else experienced this? Engine has 20hrs, first oil change at 5hrs, second one at 10hrs and this third one at 20hrs (so 10hrs on oil). I had smelt petrol in previous oil changes but this is bugging me as I've seen the consequences of fuel dilution on engines before.
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Old 29-04-2017
c w c w is offline
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Join Date: Aug 2010
Location: south coast
Posts: 1,838
Get your efi fuel map checked might be on the to rich side and hav excessive fuel wash due to incorrect efi mapping
Note...having a slight fuel smell on any 4 cycle engine is normal but excessive fuel in oil is not good
2017 sherco 300 se-r six day's
2016 ktm 350 exc-f
2016 ktm 250 exc-f
2015 ktm 250 sxf
2014 ktm 250 sxf
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2012 ktm 250 exc
2012 ktm 250 exc-f
2011 310 te
2010 250 te
2009 450 te
2007 ktm 250 sx-f
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Old 12-07-2017
Indie Indie is offline
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Join Date: Dec 2011
Location: North West Tassie
Posts: 212
Did you notice if it was making oil, I think i have a similair issue with my bike, seems to run rich.

How many kms per tank ?

Looking into a power commander for it.
Sherco 2015 300 SEF-R
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Old 13-07-2017
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mollystaff mollystaff is offline
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Join Date: Mar 2006
Location: The Barossa -Where gods, if they existed, would make Shiraz.
Posts: 3,482
I've Heard this is common in modern HP 4 strokes, high comp, tiny piston, minimal rings can cause blow-by and contaminate/dilute oil.

This is the main reason the oil change intervals are so short.

I am no mechanic though.
Molly guards my toys!

2012 'Berg 300

1982 CR250RC PROJECT (wefixulongtime)


Whenever I try to make something idiot proof - Along comes a smarter idiot!
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Old 13-07-2017
cluffie cluffie is online now
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Join Date: Mar 2011
Location: melbourne
Posts: 1,424
Injector could be leaking while your not riding it also which will raise the oil level and dilute it.
I'd just change it more regulary and monitor the amount of oil that comes out.
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Old 15-07-2017
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J D J D is offline
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Join Date: Mar 2005
Location: Sydney
Posts: 1,059
Very common. Drop the oil at shorter intervals for piece of mind, especially using a non fully synthetic variant of oil.
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