Fes125 burning oil

[bazzaboy2010]

Got a 08 s-wing fes125 that was rebuilt. Everything seems ok. I do sometimes get a backfire but that is not all the time. Some days it happens and others it doesn't. But the main thing is it seems to burn oil a lot quicker. Any ideas would be great

[jaffa90]

Oh dear, if you have blow by (oil on cyl wall)i would check if the crankcase is breathing first.

[WD Forte]

"Rebuilt"

That's a term that can mean anything and nothing.
from a crank up detailed renovation to a wipe off with an oily rag and tart up.
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bikers smell of wee

[bazzaboy2010]

[jaffa90]

""""Sorry I should say that it had a new piston put in""""
Did you check the cyl wall for scouring and the piston rings/oil ring for the correct gap clearance?

[bazzaboy2010]

[RhynoCZ]

Freshly rebuilt 4 stroke engines do tend to burn some oil before they break in.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[steve the grease]

In the world I grew up in, you were supposed to rough up the bore , hone it ideally, and the thrash the engine in to wear the piston rings in. if you don't the rings can become burnished ( which is like polished) and will never seal properly in the bore. New engines are run in because both the bore and piston are in a just machined state so the rings run in. An old bore is polished, hence roughing up. yeah until bedded in they can use loads of oil.

[bazzaboy2010]

[Nobby the Bastard]

[RhynoCZ]

What Nobby the Bastard says, keep an eye on the oil consumption and get back to us after you do some more miles.

Also, if you read your service manual, they do tend to tell you what is considered as an ''excessive'' oil consumption and how to break in an fresh engine.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor