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Old 05-07-2018, 05:53 PM   #1
marmono
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electrical/battery issue

I am having (what I think to be) some kind of electrical/battery issue. I first noticed my bike (04 cbr600rr) was taking a bit longer than usual to fire, a day later it sounded really weak then the click click click. OK no problem I thought, my battery is five years old. Replaced battery, worked ok for about the first 3 startups then back to weak starts. seems to startup fine when the engine is cold, but its sort of a crapshoot when its hot, it might start it might be weak etc.*

battery voltages are as follows:

12.6 just sitting there
13.3-5 reving to about 5/6k rpm with high beams on

when hot trying to turn the motor over voltage drops to about 10 or 11

anyone have a similar issue? *
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Old 05-08-2018, 06:04 AM   #2
Anointed
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I had that issue with my 1996 Honda VFR 750F and it was the R/R.
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Old 05-08-2018, 07:48 AM   #3
BYRDMAN
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If those voltages are correct it sounds like your battery and charging system is working.

How many miles are on the bike and when was the last time u had a valve adjustment?
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Old 05-08-2018, 08:31 AM   #4
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Regulator/Rectifier is a common failure on these bikes, they over heat due to location and out, alot of times mimicking a bad battery. They are about $130 and easy to replace.
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Old 05-08-2018, 12:22 PM   #5
Patrick
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Check your battery connections and negative terminal.
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Old 05-09-2018, 11:12 AM   #6
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Quote:
Originally Posted by BYRDMAN View Post
If those voltages are correct it sounds like your battery and charging system is working.

How many miles are on the bike and when was the last time u had a valve adjustment?
Interesting you asked this: I just got the bike back together from a valve adjustment, this particular problem was starting to manifest itself before I even opened the valve cover and part of the reason I took it down for a while, for long overdue maintenance BUT all but 1 of my exhaust valves were over .04mm out of spec (target is .28mm some measurements were slightly under .24mm) When I formulated the the new shim measurement they were all odd sizes so I used the next size I had on hand, the thing that makes me a bit uncomfortable is that I used the next size on the tighter end of the spectrum and I probably should have used the next size that would have given me the looser end: In other words my final measurements ended up being around .25 (target .28+-.3) when I should have used the shim that would have given me a final measurement of around .30/.31,

thoughts on this? (new splugs as well)
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Old 03-06-2021, 09:17 PM   #7
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It might not be electrical but fuel sending, probable dirty injectors is this on your 04. Make sure your using high octane fuel and you might want to check with a pro on this one you could dump a little sea foam in there. I use it in my cars to help clean and lube line and injectors. Its made for cars though.
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