November 7, 201510 yr Hello, just bought a few months ago a GG280 2005 from an hunter which he was using to ride around the forest. The number of hours it has on it it's sadly unknown and after changing piston, clutch, rebuilding the suspensions and the linkage and countless money I blew it has a strong Vibration when I cleanout the engine. This happens when the revs go up and at a certain rotation it starts vibrating like mad. All screws are nice and tightened and I'm thinking about crankshaft bearings or even unbalanced crankshaft. Any thoughts? Cheers
November 7, 201510 yr Take the flywheel cover off and grab the rotor to feel for any up and down play.
November 7, 201510 yr Author Take the flywheel cover off and grab the rotor to feel for any up and down play. Thanks I'll do it tomorrow, that will assess if the bearings have play and so are gone
November 8, 201510 yr Author Well, just tried to rock up and down the flywheel with cold and hot engine but had no chance to feel any minimal amount of play..same was for the conrod when I changed the piston and little end bearing, all mint
November 8, 201510 yr Another common issue on the pro is the kick start pawl. It chips easily and gets carried by the idler gear to the large primary gear. (The teeth on the clutch)It does not take much metal to cause a vibration or knock. It can be very hard to find. (magnify glass needed) It gets smashed between the teeth to the point that it looks normal to the naked eye. Good luck.
November 8, 201510 yr But that should probably also be hearable when not reving it (high). Not a carb problem on high revs?
November 8, 201510 yr Author But that should probably also be hearable when not reving it (high). Not a carb problem on high revs? Well it doesn't make any rumbling noise or anything, carburetion wise it is spot on ab tad reach on the low side but than it is perfect. Maybe the crankshaft shoulders are misaligned?
November 8, 201510 yr Can you Post a video so we can hear it?Hard to describe a noise/vibration accurately
November 8, 201510 yr Petrol tank buzzing on the frame. It should have a foam strip on the underside of the tank where it rests on the frame. If not that the head steady bracket from cylinder to frame or an engine bolt is loose
November 9, 201510 yr Yeah, check the front fuel tank bolt and also the exhaust mounting bolts. And, of course, engine mounting bolts.
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