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280 Txt Pro Big End Bearing


dudz
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I have had my 280 for about 6 months. Its a 2004.

I used to have a 2003 sherco 250cc, which had lots more torque for some reason.

Anyhow. Today a knocking down low got worse very quickly. Sounded like piston slap.

Took the top end off. No scratches or grit inside the barrel. Rings look ok. Small end bearing has a little amount of play if I twist the piston along the line of the small end. (it rocks). The conrod has a massive amount of play when rocked side to side in parrallel to the crank (towards each end). Verticaly there is no play. Im strongly guessing this is wear on the big end bearing ??

The noise is not uniform. It sounds like a lump of wood in a slow running tumble dryer. Gets worse at higher revs. When cold it didnt seem to make any noise.

I looked for the two bearings separate to the conrod, but it seems to come as a complete kit for 145 pounds !!. This seams very expensive to me. I have bought these bearings for different bikes before which didnt cost more than 25 pounds for the two.

Edited by dudz
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  • 2 weeks later...

Done the bottom end on my 280 and the kit actually comes with the rod bottom end bearing and crank pin.little end bearing come's seperate at £16 and the mains (which are koyo on mine) are available anywhere,up to you but don't scrimp on quallity should you need to rebuild.

Some of GasGas bearings are to thier own spec as i found out on building the gear box , and big end. Should you need to re plate the cylinder,then Langcourts are the best ,and piston kit for mine was £130.00 Certainly wouldn't ride mine till it goes pop as if a part disintigrates it could damage the crank case .

Edited by shyted
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