Suzuki Burgman 650AN

Bertie Simmonds
April 25, 2017

Q: With a cold engine it doesn’t respond to quick throttle openings. There is a bit of a difference once the engine is warm-though from about 55mph upwards, when the throttle is open to accelerate, the bike starts to chug and miss. If the throttle is held open to hold speed to 55-60 after about two miles the engine smooths out. The bike will go up to 70mph, using gentle throttle, when joining a motorway, but will not take heavy acceleration. I wired a switch into the diagnosis plug and when the fuel injection light came on the codes 24 and 25 came up. The light resets after ignition is turned off and restarted, when the diagnosis switched on with engine off it shows -c00(no code.) The throttle position is correct, I have carried out an ohms test on ignition coils and crank shaft sensor and all are correct.

Does your Burgman burp?

A: The C24 and C25 codes are errors within the ignition system. The ECM has detected that no signal was received from the ignition coil for (what it regards as) an extended period i.e. 0.5 seconds. This is generally caused by a poor electrical supply to the system (perhaps because the battery voltage is low or the battery itself is unserviceable) or a bad electrical contact in a wiring connector, or possibly a faulty ignition coil.

About the Author

Bertie Simmonds

As a child Bertie (well, Robert back then… blame his sister for the nickname) was exposed to motorcycles thanks to his uncles. They would show up at his house with a lovely lady as pillion throughout the 1970s and 1980s. After a naughty time on field bikes (it’s what we did back then) Bertie passed his test in the early 1990s and became a reporter for MCN in 1995, moving to the sports desk and covering World Superbikes in 1996. With a change to Bike Magazine in 1997, he stayed until 2000 as news, features and road test editor. Moving into PR with Cosworth, Bert was bored with cars and returned to bikes in 2001 with Two Wheels Only, becoming editor in 2002 and leaving to be freelance at the end of 2004. With almost a decade freelancing, Bertie joined Mortons in 2013 and became editor of Classic Motorcycle Mechanics, a post he’s desperately clung to, to this day. And no, he’s never had a pretty girl on the back of his bike.

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