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Engine Miss - Under 2,000 RPM

Started by Lotsokids, July 14, 2013, 11:24:28 PM

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Lotsokids

My bike has developed a "chugging" or miss under 2,000 RPM with a slow roll-on with the throttle. I took it out yesterday and refueled, but it was VERY hard to start, and almost didn't. I reached 145 MPH (I don't do that very often) and it pulled really strong.

Any thoughts? :unknown:
U.S. Air Force sport bike instructor (initial cadre), 2007-2009

I'm an American living & working in Hungary

Flying Scotsman

I think I would look at the carbs...
High speed circuit is ok
Mid range ok
Low speed circuit or choke not so good.
Pilots or idle air fuel mixture.
1984 FJ1100
1985 FJ1100
1990 FJ1200
1999 GP1200 (165 + hp)

RichBaker

If it started this AFTER the refuel, I'd be looking at the new gas..... Water in it, maybe?
Rich Baker - NRA Life, AZCDL, Trail Riders of S. AZ. , AMA Life, BRC, HEAT Dirt Riders, SAMA....
Tennessee Squire
90 FJ1200, 03 WR450F ;8^P

Lotsokids

Quote from: RichBaker on July 15, 2013, 11:42:39 PM
If it started this AFTER the refuel, I'd be looking at the new gas..... Water in it, maybe?

I thought of that also. I'm running some complete fuel system cleaner through it now.
U.S. Air Force sport bike instructor (initial cadre), 2007-2009

I'm an American living & working in Hungary

mr blackstock

G'day,

mine was missing badly at low revs, I suspected electrical, so just for a try I put on some spare spark plug caps off another bike and the problem seemed much better.  So I bought 4 new NGK and the problem has all but disappeared.  I will get some new plugs soon and that might solve the issue completely.

Anything to avoid pulling the carbs apart!

Cheers, Gareth
Squeaky wheels always get the grease...

Yamaha FJ1100 1985