Got this dead 550L for parts in a trade for an 850G, with some wiring caused electrical problems. Hotwired it to test the engine, there's a loud cam chain noise. I twisted the knob on the cam chain tensioner as it idled, it felt wrong, it turned too easily. Shut the engine off, looked closer, the big spring on the outside of the tensioner was wound the wrong way, wrapped clockwise so it pushed the knob counter clockwise, instead of pulling it clockwise. Backwards, it was pushing the end inside away from the pushrod, not towards it, so only the inner spring alone was trying to tension the chain. Fixed the spring, not even a wrench required, just pulled it out of it's hole, twisted it the right direction, put it back in. Now it purrs like a kitten, I have a solid engine for my new 550...
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