Mysterious rattle suddenly appeared - K-Bikes.com - Excellence in Motion
 
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post #1 of 6 (permalink) Old May 21st, 2020, 1:16 am Thread Starter
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Mysterious rattle suddenly appeared

When accelerating around 3-5k rpm.

I was doing some practice in a parking lot. I thought I heard a noise from deep inside the engine, but everything immediately appeared fine.

Now I just took the bike out, and I hear a mysterious rattle (not the normal shakiness/vibration around 3-4k RPM) seemingly coming from the top of the engine.

Is it possible the bike jumped a tooth on the chain? Shouldn't be, I have the recall tensioner installed. What would valves sound like?

I did just put in 89 octane gas, would pinging sound like that? It seems to smooth out over higher RPM, but I haven't tested it. Shit.
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post #2 of 6 (permalink) Old May 21st, 2020, 2:29 pm
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post #3 of 6 (permalink) Old May 21st, 2020, 4:34 pm Thread Starter
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2005 K1200s

I have a suspicion whatís going on.

I had earlier put regular gas in the tank, and I think it did some sort of switchover.

The rattle has since disappeared, and Iíve got 3 gallons of the freshest 93 octane Texas has to offer. I hope thatís it.
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post #4 of 6 (permalink) Old May 21st, 2020, 8:58 pm
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Solved you own problem, rattle was pinging and piston rattle due to nasty gas. Always buy the best. Do a search for Top Tier gas.
https://toptiergas.com/licensed-brands/

Mount Vernon, WA.
tire guy, I'll mount your tires.
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post #5 of 6 (permalink) Old May 22nd, 2020, 1:51 pm Thread Starter
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Quote:
Originally Posted by Beech View Post
Solved you own problem, rattle was pinging and piston rattle due to nasty gas. Always buy the best. Do a search for Top Tier gas.
https://toptiergas.com/licensed-brands/
I’d called the dealer in San Antonio, and they said regular gas would work fine. He’s wrong. It’s premium from now on.

Does anyone else do the premium hunt? Drive around a gas station and calculate who last put premium or sit behind some premium car who’s also tanking premium?
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post #6 of 6 (permalink) Old May 22nd, 2020, 10:32 pm
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Just don't buy premium gas at some out of the way station where no one in town has a turbo car. Then only half a tank. Many cars now use premium so the odds are in your favor. No real need to worry about that half gallon or less that will come out as regular. American Petroleum Institute says about 1/3 of a gallon is in the system so no real worries. But it is cool to look for the proper situation. I never bother though. But, as you have experienced, I was on a cross country trip on my K13S. We were in the middle of no where back east and could only get regular 87 octane. Bikes were dogs. The next gas station was a Conoco and we got some 94 octane. Could now pass cars while in 6th gear. It was like a switch had been flipped. Chevron gas in Canada has 94 also. Have not seen that stuff on the West Coast. Don't let people tell you it makes no difference, it does. (do not go down the road of comparing EU fuel ratings against USA, they are different numbers)

Mount Vernon, WA.
tire guy, I'll mount your tires.
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