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While stuck in highway bumper to bumper traffic for about 30min, once I pulled away and accelerated up to 4th gear, the bike made what i can say is a clanging type sound that went away once moving out at a pretty good speed and was gone by the time I was in 6th gear.Ive heard this sound before, anyone else, and if so, any idea what it is?Thx-
I prefer to ride slowly on the shoulder until I clear the blockage.If the cops are there they are too busy clearing the problem to stop a bike. If stopped I would explain the air cooed engine vulnerabilities to heat.The only folks bothered by this are stuck far back in the tie up.
On aviation air cooled flat engines, mostly Lycomings but Continentals as well, Bolduc aviation did some investigation on why there were so many exhaust valve problems. They found that at ( going by memory) 260 F the alloy in the aluminum cylinder heads was rapidly loosing strength. After an extended running time waiting to take off the engine gets heat soaked. Then before it gets enough cooling air flow over engine, it gets a load taking off. The exhaust valves flop around like fish, not being well supported by the weakening aluminum. By 300F, 50% of the strength is gone. It’s not the same on Guzzi engines, aviation uses steel barrels with aluminum heads screwed on. We use aluminum barrels and heads but it’s a good reason to not load the engine when it’s way hot.
Kevin Cameron just addressed this issue in the online Cycle World website. https://www.cycleworld.com/story/blogs/ask-kevin/metal-creep-cylinder-heads-and-exhaust-valves-explained/kk
I prefer to ride slowly on the shoulder until I clear the blockage.If the cops are there they are too busy clearing the problem to stop a bike.If stopped I would explain the air cooed engine vulnerabilities to heat.The only folks bothered by this are stuck far back in the tie up.