speedwayaus

Our 2013 had a few problems. One of them caused a crank main bearing failure. The factory had fitted main bearings with only one seal facing inward. This left the outside of the bearing open and with no lubrication. The Formula brand brakes have been very troublesome. Best to buy a later model with AJP brakes. Watch out for a seized swingarm bolt. Make sure you check it moves before paying any money.. Get a photo if you cant see the bike..

To update this 2013 125 rebuild project. The bike runs and starts perfect now. The question about not having seals on the outside of the bearings still remains a mystery. The only theory I can come up with is that the same company most likely supplies cranks to both Gas Gas and Sherco. As Gassers don't have the seal in the outside of the bearings.(lubed by gearbox oil) It's my guess that somebody fitted the Gas Gas bearings to the Sherco crank that day.

Wrong, wrong wrong... Best to keep the info on this thread correct, as there would most likely be other bikes out there like ours. With incorrect bearings fitted, that will blow up eventually.. There's no way for oil to get to the outside of the bearing if there's an inside seal fitted. I don't doubt the fully sealed bearing theory, much to the dismay of my engine building mates Love how mechanics get set in their ways. I fitted 2 standard .5mm base gaskets and the squish is now 1mm. this means it was running with .5mm squish.. Does that seem correct?

Has anyone tried using two base gaskets to make 125's a bit easier to start for 11 year olds? Do you need to change the jetting? Anyone with a 2013 125 needs to be aware of the possibility of their bike also having no seal on the wrong side of the main bearings. Can't imagine that ours is the only one they built that day. You can see the bearing if you remove the left hand crank seal..

Hi all. My kids ride trials and other motorcycles. Been really good for them so far. The mystery I have now is my sons 2013 Sherco 125 has blown the left side main bearing. The mystery part is the main bearings have only got seals on one side. (the wrong side, as it happens) The main bearings only have seals on the side that faces the crank fly wheel. The other side that points away from crank wheels don't have any seals. My understanding is these bikes run fully sealed main bearings. Has anyone seen this before from the factory? Another question regarding these sealed bearings, is why do they still run crankcase crank seals? I cant see why you would need them.