There was a page on the net entitled BRP achille's heel with the most common/known failures - nothing on it is actually major. However I can't find the URL anymore.
On top of thet, being a thumper and a dirt bike, the first things I would check:
- compression (the most important). Try kicking it thourgh the TDC (top dead center) without the use of the manual decompressor and if you can without significant effort then the compression is under question
- bearings: front/rear wheel and rear linkage/suspension. Invidually they might not be expensive but if you end up doing the whole rear it will not be cheap
Another way to see the state of the engine is to start it from cold and see how easy it is.
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