Quote:
Originally Posted by Foxrider64
I suspect bad gas too.
But valve clearances out of spec can also cause sputtering from mistimed valve openings and closing.
How many miles are on the bike and were the valves ever adjusted?
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Yeah with over 30k on the bike, I'd highly suspect valve clearances. Also, even if the valve clearances have been done on schedule, you'll notice in the service manual that those intervals get really close together the higher the miles. This is because even with it done on time, after that many miles there's just inherent wear on the bike that'll show up a be a problem. It may be time for at least a top end overhaul.