CBR400 STARTING PROBLEMS

NORRIE · L Plate Warrior Joined: 29 Jun 2008 Karma :

I have a problem with my e reg CBR400 as it will not start unless i put a booster starter pack on it then it will run for a day or so before needing the same again it will turn over no bother but will not start the guy i bought it from has tried a new battery and has replaced the engine as the last engine was doing the same any ideas would be helpful cheers

teampots · Spanner Monkey Joined: 01 May 2007 Karma :

charging circuit dead perhaps?

tried a new rectifier?
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Current - Fazer 600
Prev - Bandit x2 (Killed) CB400 (Superfour) CBR125
Currently Restoring - Kawasaki S1 250 Triple (Slowly but surely)

NORRIE · L Plate Warrior Joined: 29 Jun 2008 Karma :

Surely if it was the rectifier it would not turn over would it where is the rectifier located and i cxould try it or maybe it could be tested

karidian · World Chat Champion Joined: 12 Apr 2008 Karma :

I have a cb1 400 and when the radiator fan switch packed in i hard wired the fan to stay on all the time to avoid overheating. The upshot was that when i tried to start the bike the fan was drawing too much current from the battery so wouldnt start. (would start ok with a push start or jump start). I would recommend getting a meter and measuring the current drop from your battery when you try to start. With the fan on my bike dropped from 12v to 6.5. Without the fan it only dropped to 10.5. If the current drops too much you have a power drain somewhere. Unfortunately that pretty much sums up my knowledge so i cant help any further lol. Good luck with it.
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G reg Honda CB1 400; 06 Kawasaki ER6F abs, X reg Bandit 600sy. 1998 Cb600f Hornet. 08 zx6r current.