jomor147
Junior Member
Bottom line is that on battery during cranking i have 11.5v, and on ecu 10.7v ( d09 ) and coil positive 10.7. The coil positive was measured with battery negative as reference. During cranking I have 0.2v dV at ecu negative compared to battery negative so the coil gets a +0.2v negative trigger at cranking, that's a 10.5V primary winding trigger.
Today after taking the above measurements the engine refused to start. I put 3rd gear, cranked with the clutch lever pulled and the bike started. Same as the day before yesterday where I pushed the bike for a meter with 3rd gear (did not have enough room to push start properly) and cranked again and started ok. This was a suggestion by the second mechanic who suspects the starter motor itself and wanted me to move the crankshaft and related gears a bit. Did not understand why this could work but it seems there is a relationship with the starter which seems to draw more current than nominal anyway. AI says that Chinese brushes often have improper carbon/copper compound, wrong pressure force, sometimes are also undesized resulting in quick wearing and bad contact, explaining what the mechanic has experienced and described. So in order to eliminate this as a root cause my options are
- repair again (this vandalized starter) with a good quality kit
- get a used starter from ebay
- get a Magneti Marelli starter (100€)
- get an Arrowhead starter (195€)
- get a Yamaha/Mitsuba starter (200€)
And hope that the new starter draws 50-55A creating smaller drops, allowing the ecu and coils to work normally IF the problem is electrical and not mechanical (starter, starter clutch related). I am also planning to feed the coils+ directly from battery via a relay and fuse.
Up to now I have measured findings but still not able to say if they actually are causing the problem or not and I am just measuring what every bike has at 100.000kms.
Today after taking the above measurements the engine refused to start. I put 3rd gear, cranked with the clutch lever pulled and the bike started. Same as the day before yesterday where I pushed the bike for a meter with 3rd gear (did not have enough room to push start properly) and cranked again and started ok. This was a suggestion by the second mechanic who suspects the starter motor itself and wanted me to move the crankshaft and related gears a bit. Did not understand why this could work but it seems there is a relationship with the starter which seems to draw more current than nominal anyway. AI says that Chinese brushes often have improper carbon/copper compound, wrong pressure force, sometimes are also undesized resulting in quick wearing and bad contact, explaining what the mechanic has experienced and described. So in order to eliminate this as a root cause my options are
- repair again (this vandalized starter) with a good quality kit
- get a used starter from ebay
- get a Magneti Marelli starter (100€)
- get an Arrowhead starter (195€)
- get a Yamaha/Mitsuba starter (200€)
And hope that the new starter draws 50-55A creating smaller drops, allowing the ecu and coils to work normally IF the problem is electrical and not mechanical (starter, starter clutch related). I am also planning to feed the coils+ directly from battery via a relay and fuse.
Up to now I have measured findings but still not able to say if they actually are causing the problem or not and I am just measuring what every bike has at 100.000kms.
