Pressureangle Posted June 20, 2022 Report Share Posted June 20, 2022 Here's my opinion, feel free to disregard it. If you're getting 40mpg, your 'driving' mixture is quite-good-to-lean. If your plugs are black, it's rich at idle or isn't ridden long enough when warm to clean them. Mine had the dreaded '2800/3200 rpm stutter' and intermittent idle stall until I replaced the cam chain with a gearset- then these things, completely unexpectedly, disappeared. At the very least, be certain your cam chain is adjusted properly. The stock adjuster must be attended manually. For my time invested, I'd at minimum replace the stock tensioner with a Valtec, or adjust the stock one properly while awaiting a set of Caruso cam gears. Edit; got my bikes mixed up. The '97 has a spring-type tensioner, but it's woefully weak and I believe allows enough timing variation to confuse the ECU at idle and in the ~3k rpm range. 1 Link to comment Share on other sites More sharing options...
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