bigvalyeti
CB750 New member
Hello guys,
I am starting to loose faith with my CB...
I bought this bike a few years back never really got the chance to ride for long trips as I quickly experienced engine problems.
I decided to have the engine fully redone by Gabriel Martin Garage in Longueuil, Canada (Honda parts only).
That done the engine runs like a charm. Only big problem is the charging system. When I bought the bike it was already running a small
8 cell Antigravity battery with a mofset reg/rec. My mechanic doesn't really know what's not "original" so he doesn't really want to understand lithium technology.
Here are all the mods I have on the bike:
- Dyna S + dyna 3 Ohms coils (with proper insulated cables and boots)
- Cognito Moto oil tank + air filter (carbs all rejetted)
- Antigravity 1201 battery
- Ricks motorsport lithium compatible (field coil compatible) Reg/Rec - directly connected to positive battery terminal through a relay.
- Delkevic straight 4 in 1 exhaust
- Daytona Velona W speedo/tachometer
- H4 LED main light
- Purpose Built dual light turn signals
- My mechanic redid the wiring harness
First problem while reassembling the bike my mechanic couldn't have the bike go over 13.5V even when revving it up around 3-4k rpms.
He blamed the bike because as always with him "its not original!", I agree but as it is not Rocket science, and being stubborn as hell, it should work.
Turned out one of the phase of the stator was not connected (-___-") Problem fixed! I rechecked and the bike was well stabilizing the voltage at 14V-14.2V after revving it.
So I decided to go for some test ride around town and first trip 50k away, no issue, bike is staying around 14V on the highway.
Second test ride 160km away, one way no issue everything is perfect. On the way back my lights start getting dimmer and dimmer until the whole bike dies.
Checked the battery almost at 10V.
Got stranded.. again...
I suspect the Reg/Rec or the Field coil to have failed.
I checked the stator and 6 Ohms on each phase cable and no ground either.
I recharged my lithium battery and tested again, no charge at all, bike voltage maxes out at 13.5V, the voltage from the Reg cable going to the field coil stays at 13.3V and weirdly goes up a bit around 13.5V when I rev the bike (should theoretically go down as I rev, right?).
My field coil gives me 8 Ohms resistance, but my Stator output between each phase doesn't go higher than 13.5 V AC.....
Has anybody ever experienced that?
I am starting to seriously doubt a fully working/reliable lithium conversion is possible...
I am starting to loose faith with my CB...
I bought this bike a few years back never really got the chance to ride for long trips as I quickly experienced engine problems.
I decided to have the engine fully redone by Gabriel Martin Garage in Longueuil, Canada (Honda parts only).
That done the engine runs like a charm. Only big problem is the charging system. When I bought the bike it was already running a small
8 cell Antigravity battery with a mofset reg/rec. My mechanic doesn't really know what's not "original" so he doesn't really want to understand lithium technology.
Here are all the mods I have on the bike:
- Dyna S + dyna 3 Ohms coils (with proper insulated cables and boots)
- Cognito Moto oil tank + air filter (carbs all rejetted)
- Antigravity 1201 battery
- Ricks motorsport lithium compatible (field coil compatible) Reg/Rec - directly connected to positive battery terminal through a relay.
- Delkevic straight 4 in 1 exhaust
- Daytona Velona W speedo/tachometer
- H4 LED main light
- Purpose Built dual light turn signals
- My mechanic redid the wiring harness
First problem while reassembling the bike my mechanic couldn't have the bike go over 13.5V even when revving it up around 3-4k rpms.
He blamed the bike because as always with him "its not original!", I agree but as it is not Rocket science, and being stubborn as hell, it should work.
Turned out one of the phase of the stator was not connected (-___-") Problem fixed! I rechecked and the bike was well stabilizing the voltage at 14V-14.2V after revving it.
So I decided to go for some test ride around town and first trip 50k away, no issue, bike is staying around 14V on the highway.
Second test ride 160km away, one way no issue everything is perfect. On the way back my lights start getting dimmer and dimmer until the whole bike dies.
Checked the battery almost at 10V.
Got stranded.. again...
I suspect the Reg/Rec or the Field coil to have failed.
I checked the stator and 6 Ohms on each phase cable and no ground either.
I recharged my lithium battery and tested again, no charge at all, bike voltage maxes out at 13.5V, the voltage from the Reg cable going to the field coil stays at 13.3V and weirdly goes up a bit around 13.5V when I rev the bike (should theoretically go down as I rev, right?).
My field coil gives me 8 Ohms resistance, but my Stator output between each phase doesn't go higher than 13.5 V AC.....
Has anybody ever experienced that?
I am starting to seriously doubt a fully working/reliable lithium conversion is possible...
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