Question about 1993 Yamaha FZ 750 KT (Europe)

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Charging system When my bike (Yam FZ 750 KT ) is idling, I get 13.26 volts on the battery. Now the thing is Im using a car-battery to run my system... my motorcycle battery was crumb.. and I wanted to get the bike up and running first. Apparently the stator and rotor resistances are fine. Now is the lower voltage only because its trying to charge a larger capacity battery... or will I now have to check the rectifier and the regulator??? I had the bike idling for about 20 minutes on the car battery, and the voltage on the car battery did not drop ... so Im assuming that some charge is trickling through... any guesses as to what the problem might be??? While the bike was running, I did momentarily disconnect the battery from the charging system... and the idling speed promptly increased.. so some load was definitely taken off the charging system. Also I do believe that the charging system on an FZ 750 KT is the non-permanent magnet type alternator.. so current is definitely drawn from the battery to excite the rotor coil.

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  • Anonymous Mar 25, 2014

    Battery does not charge when bike is running

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I think 13.26 is very good for a bike of it's age. Especially charging a bigger cell battery such as a car battery! I wouldn't worry to much about your charging system looks to be doing just fine. almost sounds like your bike needs to be taken out for a Relief of sitting run.

Posted on Nov 10, 2008

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THE BIKE WONT KEEP A CHARGE


Remove the seat to access the battery.
A loose battery connection will prevent charging, Tighten if loose.
If tight, start the bike.
Use a multimeter set on d/c volts or just a volt meter.
Hook red to positive and black to negative.
should read 12.50 volts - 13.50 volts at idle.
Anything under 12.50 means not charging at idle.
Rev motor to 2000 rpm. the meter should read 13.50 - 14.8. If the volts do not change, then your bike is not charging, Anything Higher than 15.0 means that your bike is overcharging, which usully fries the battery and blows the headlight fuse and/or main fuse.

If over/undercharging, this means that the voltage regulator is bad.
Before you buy another one, make sure the one you have is plugged in all the way and that the connectors are clean.
I had a GSXR 750 that sat for a while and i had to clean every connector on the bike before it would run/operate like it should, so a dirty or loose connection should be checked first.
Saves you a lot of money too because voltage regulators are usually over $100.

If you do not ride for months at a time, your battery will discharge over time.
a battery tender or battery charger is needed to keep the battery charged when the bike is not in use. Motorcycle batteries are not like car batteries, that seem to last forever. 4-5 years is about all you'll get out of a motorcycle battery on a motorcycle that is ridden alot.
On a motorcycle that is barely ridden, won't last much more than 2 years if your lucky.
Hope this information was helpful
Best regards
Big Al

May 28, 2011 | 2000 Suzuki GSX-R 750

2 Answers

I have a 1998 Suzuki GSX-R 750 SRAD. My problem is my battery doesn't seem to stay charged. I have to Jump it off with my car, but then when I remove the cable the bike shuts off. The battery is brand...


sounds like your charging system went out, this isn't a new problem to bikes and alot of older bike have this issue. First was your car running when you jump started your bike?? If so this can cause damage to the charging system. if your not sure how to replace the stator and reg/rec i will happey to help you get it done. please understand that this does take some thinking and removing the tail, left hand body parts and the lh side cover of the motor. If your will to take it on let me know. If not your local bike shop can fix your bike in about a week if they have to order parts. the stator on your bike isn't the cheapest and reg/rec isn;t that bad as far as price goes. you'll need oil a filter and a new gasket for the motor cover and the charging system parts.
let me know what you would like to do.
M.Woodring
madminibiker@gmail.com

Apr 19, 2011 | 1998 Suzuki GSX-R 750 W

1 Answer

My 2005 C50T has been sitting for some time. I jump started it however when I ride it, the bike feels like it looses power then the oil light and gas light flicker and the speedometer drops to zero...not...


it sounds like your battery or charging system is shot. when you jump started it was off a car?? was the car running?? if the car was running then it is likely you have fried your charging system, your car alt. buts out more volts then a bike and long and short of it can " overload " you charging system.
this is what i would do for starters, check your charging system you'll need a volt meter " multimeter "
and a few tools to get to your battery. check your battery before you start your bike it should be at 12 volts or right near +/- now start the bike and check you charge at idle, 13 volts +/- now rev your bike or have a buddy do it for you, you get around 14 volts. it your volts drop when you rev the bike or at any time while the bike is running your charging system is shot. your charging system is three thing 1 stator, this is what makes the electricity (a/c) the next in line is the regulator rectifier this takes the a/c and converts into d/c. electricity can only be made in a/c and can only be stored in d/c, it also regulates it to 14.5. the third is of course the battery. if any part is not working right the whole thing fails. while your at there at your battery pull it out and do a load test on it, if you dont have a load tester your local parts store or bike shop should.
check into this part and let me know what you find if everything checks out good we'll take the next step
good luck
Mark Woodring

Jan 25, 2011 | 2005 Suzuki Boulevard C50T

1 Answer

Bought a 2002, 750 gsxr, rode it for an hour, then the bike just stalled at a red light, charged it and the same thing happened after riding a while, is the battery not being fully charged by the bike?


sounds like the battery either not holding a charge start the bike run a multi meter across the battery whilst giving a few revs and it should read between 13 and 14 volts if it reads this then its dfinatly the battery but if the voltage does not go up with increased revs first thing would be the regulator rectifier last thing the most exspensive would be the alternator hope this helps

Oct 26, 2010 | 2002 Suzuki GSX-R 750

2 Answers

1978 GS 750 E: battery will not charge...


if it takes a charge off the bike on the bench, (if not replace it) check your fuses.If you still cant run it, the volt regulator (rectifier) may be bad.

May 06, 2010 | 1978 Suzuki GS 750 E

1 Answer

My yam fz 750 fm has no spark at all,the bike was parked up for 2 years was ok before ?


this is likley to be a low tenshion feed problem, like points or switch,,its some thing simpel thats stoping the spark, take the points out and clean them up on sand paper checking that they open and close and are clean,check the coiles that the whire is clean and tight, and all the wiring loom if you can also the ig/switch, give it a swill with switch cleaner it may have croshion in it by now, then strip the carbs and clean all the jets, as i bet there all blocked up as well by now,,, flush out the fule tank with fresh fule and use a good fully charged battery to start up on, hope this helps good luck,

Nov 10, 2009 | 1986 Yamaha FZ 750 FM (Japan)

1 Answer

Does the yamaha fz 750 use transmission fluid or just the motro oil


The FZ750 uses the same oil for the transmission and crankshaft and top end. All oil is stored in the oil pan below the transmission and distributed throughout the engine by an oil pump.
If you are asking if you need to use different oil for the transmission than the engine, no.
If the oil level is correct for the transmission, it is correct for the whole engine.

Oct 04, 2009 | 1992 Yamaha FZ 750 KT (Europe)

1 Answer

Charging system not charging like it should.


check the generator output as this normaly fails on this model

Mar 08, 2009 | 1993 Yamaha FZ 750 KT (Europe)

1 Answer

Yamaha FZ 750 FM


It sounds like the idle screw is not set right., but if your going to clean the carbs anywyas. Clean them, sync them and see how she runs, if still doing the same thing the idle screw needs to be adjusted. The RPMs should be between 800 to 1200 while idling. If your bike is an older on it will most likely sit around the 1200 rpm at idle.

Nov 10, 2008 | 1986 Yamaha FZ 750 FM (Japan)

1 Answer

Passing igniton


The best thing to do is to purchase a haynes or clymer manual for the bike and look up t he wiring diagram. The contain the colour codes and all other info you need. Another alternative would be to go to a dealer with the key code (normally embossed onto the lock) and get a key made. You are going to need a key if you're going to ride the bike anyway.

Nov 10, 2008 | 1988 Yamaha FZ 750 BV (Europe-US)

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