Dropping cylinder at 10rpm and possible generator /stater problem
Hi, couple of questions for you. with a fully charged battery, bike starts and runs fine upto 10rpm - then misses, seems like its dropping left hand cylinder at 10rmp - losing 8bhp on rolling road at 10rpm. also, after riding for about half an hour, engine will splutter and eventually stop, at this point battery will be drained and starter will not turn over, whats strange is i can bump start it with lights off and ride longer, but if i turn the lights on, engine dies, like its losing spark. have had the battery checked and apparently its ok, what do you think? generator / stater faulty - not charging battery and when battery is dead it loses the spark? whould that explain why when the battery is dead and you have the lights on the engine dies? what else could it be? what about dropping a cylinder at 10rpm? coil packs? or related to other problem, surely if one coil pack was faulty it would drop 2 cylinders if one coil pack supoprts two cylinders? where would the cdi unit come into this? i dont know what it does.
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Re: dropping cylinder at 10rpm and possible generator...
It seems the charging system of your bike is not working
Recharge the battery and thn fit it in the bike and start it and check the charging rate.
Remember with lights 'on' it drains power from the battery butthe charging system of theengine takes over i.e. if its working alright, with your explanation, its for sure the charging system is not functioning.
Chekc the altenator and the rectifier.
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Sounds like you need to check the generator and charging circuit.
The bike will start and run on the battery alone until it is drained.
Once a bike has been started the battery power is taken over by the generators power this also replenishes the power lost in the battery when the bike is initially started. If the generator does not generate power the bike will continue to us the power from the battery until it is exhausted and will therefore stop.
A simple test is to turn the bike ignition on and turn the headlamp on (check the brightness of the lamp) Start the bike and re check the brightness of the head lamp, it should be a little brighter if the generator is working. Another test is carried out with the use of a voltage tester (multi meter). Set on dc volts test the batteries voltage eg 12vdc, start the bike and re test the voltage should be around 13 - 14v dc if the charging circuit is working
Did you fully disassemble ALL the carburetors completely?
If you didn't, STOP and have a qualified professional clean them and set them...eliminate this piece of the puzzle FIRST!!! There is NO substitute for total disassembly and a thorough professional cleaning!!!
After you get it running, check the charging system..with a good battery and the engine running, you should get 13.8+ volts at 3500 RPM. - if not.. have the battery LOAD tested.. the CCA, (Cold Cranking Amps) is what determines whether the battery is good or not!! O'Reilly, Autozone, Advance Auto can check this..
Once you have a good battery and the bike is charging properly, you can proceed with further diagnosis..
If you battery had a standard reading of 11.5 volts that drops down to .5 volts when you put load on the battery, your battery has gone bad. A healthy battery will give you a static reading of around 12.6 volts, and that will drop to about 12 volts when you're starting the bike. Conversely, when the bike is running, you should see 13.5-14.5 volts across the battery terminals. That shows that the alternator is charging and that the battery is good.
I have a vehicle with a battery going south. I have a static voltage of 12.16 volts, and I only get about 13.2 volts across the terminal when the car is running and the alternator is charging the battery. Soon, it will be time to change out the battery.
The battery needs to be in top condition to give enough power to turn that single cylinder engine. Charge the battery properly, not just with a battery conditioner like the Opitmate. When it's fully charged everything should be ok. If not, get a new battery and follow the instructions for charging it. If you aren't using the bike for more than a couple of weeks, get a battery conditioner to keep it fully charged.
Hi, it is normal for the battery to drain while starting the bike, the question is why does the bike fail to start Has the shop. Considered the battery may be faulty?done a drop test on the battery,checked for possible high voltage drains, does the bike start with a push?when the bike runs does it charge the bike sufficiantly? Does the bike run with no problems, what is the shops theory on this matter? Poss starter motor problem in the likelyhood the battery is in good order, but you must do all the ness checks before purchasing a new or used starter, i would suggest try a new shop for a second opinion first, regards paul
Did you get your problem fixed. I have a similar one - new battery - started fine several times and now won't start without hooking the battery to either a jump or putting on a charger. If you can help - I am w8bnl at yahoo dot com. Tom - thanks
depending how old is the battery , it could be on its way out . check one thing first ...
turn your bike on ,
turn the head light on ,
while given a bit of gas , check if the light increases in brightness .
If it does , the regulator will be ok as well as your magneto/altenator .
if it does not increases in brightness , you have to check the output from your altenator and see if the ouput is greater than after the regulator .
if the output is the same while revs are up , you have a faulty altenator .
I dont believe this bike has a rectifier, just a generator, located in the bottom forward engine case. You can test the generator by charging the battery, put the bike on the center stand, attach a DC volt meter to the pos and neg of the battery and run the engine, the volt meter will show 13.6 - 14 volts if the generator works. It is possible you got a battery with a dead cell causing it to never get fully charged... sometimes they're dropped during shipping and other handling. charge the battery and check the voltage, if it seems good, take it out bring it to an auto store and ask them to load test the battery, theyll do it free at most places. if it fails...the battery you got was a dud, take your receipt to the store you bought it and explain what happened and they should honor their service and replace it free. good luck. if the bat is good and the alternator is not charging there are a few other directions to go...