- Fri Feb 12, 2021 5:42 am
#95191
Hi All
2003 cast iron Bullet 500
After a good start and riding 50 kms or so the engine starts to miss initially occasionally and then only firing intermittently with some big bangs before dying . If I put a new spark plug in it will be okay for a while and then the process starts all over again. Spark plug sooty despite moving circlip up on needle carburetor. Condenser okay, ignition timing okay, points gap okay, battery okay (12.88 volts, alternator charging), HT coil tested and seems to be okay. Tried NGKB8ES, NGKB7ES (slightly hotter),
Champion N7YC but they all give up although Champion seems to last a bit longer. I wondered if it was a loose connection somewhere but engine readily responding after fitting new plug (despite being hot)throws doubt on this theory. It is this intermittent failure after a 45 minutes ride or so which makes diagnosis tricky. Any ideas welcome. Clement.
2003 cast iron Bullet 500
After a good start and riding 50 kms or so the engine starts to miss initially occasionally and then only firing intermittently with some big bangs before dying . If I put a new spark plug in it will be okay for a while and then the process starts all over again. Spark plug sooty despite moving circlip up on needle carburetor. Condenser okay, ignition timing okay, points gap okay, battery okay (12.88 volts, alternator charging), HT coil tested and seems to be okay. Tried NGKB8ES, NGKB7ES (slightly hotter),
Champion N7YC but they all give up although Champion seems to last a bit longer. I wondered if it was a loose connection somewhere but engine readily responding after fitting new plug (despite being hot)throws doubt on this theory. It is this intermittent failure after a 45 minutes ride or so which makes diagnosis tricky. Any ideas welcome. Clement.