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My CBR300R wont start, even with jumper cables... PLEASE HELP

15191 Views 35 Replies 13 Participants Last post by  Painfulupchuck
So i was riding back from visiting my friend at his college when my bike started losing power slowly, i pulled over and it died. I tried starting it a few times and got it going, took an exit and it did the same thing, this time it wouldnt start back up so i called a towing company to get me home. the next day i went to check on her and it still wouldnt start, the lights came on but when i hit the starter it made this jitter sound. few days passed and i went to check on it again, i checked the air intake and everything was clean and not blocked. When i put the key in though, the lights were all so dim (dash,headlights etc) I pushed the starter and it wouldnt even make the jitter sound. few more days passed until i checked it again and when i turn the key, nothing, not lights, nothing. I tried to jumpstart it with my car (car off obv) all the connections were right because i got sparks, pos to pos and neg to my frame, every light turns on but when i hit the starter, NOTHING, It just turns everything off when i hit the starter. when i let go, everything comes back on.. idk what the poblem could be. When i serviced the bike they fixed the starter relay recall. PLEASE HELP ME. this weekend wether looks great and i cant miss out on riding.:devil::serious:
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bumb starting didnt work. when i push the start button it makes one click sound and the HUD goes blank and all lights go out. Im not sure if the starter is the problem becuase ive been riding it for months with the new one (but i dont know much about mechanics so i could be wrong)
By 'starter' I assume you mean starter relay rather than starter motor. Probably not either esp starter motor. With the symptoms you describe it sounds like your battery is flat again so maybe you have a battery drain going on. Or a bad battery terminal connection. Do you have a multi meter so you can check your battery voltage?
I assume the new battery was fully charged before it was fitted? Was it checked?

If yes, then I also assume the first thing you did after fitting it was try to start the bike? Did it turn over? If so, how fast - as fast as normal or slowly?
The new battery was new lol it was kept on a tender too in the shop. The engine doesn't turn over at all. I push the start button and nothing. Just a click
I'm still suspicious of that new starter relay......
When I had my starting problem on the day I was supposed to take my bike it did the same thing, all the lights worked and the dash but it just clicked, dead battery. As far as I know you can't bump a fuel injection bike with a flat battery as it needs charge to fire the injectors. Not sure if letting a battery go flat can damage the cells, try a proper charge on the new battery then see if it starts but I would not ride it to the dealers, let them collect it under warranty. As for battery leakage, mine is 47 ma and I think its supposed to be 34 ma Max, if I leave my bike any length of time the battery will die faster than it should so I have mine on a tender all the time.
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I'll call the dealership and see what they can do. However I just don't think it's the battery, I literally bought it yesterday and it was brand new and kept on a tender. Is there anything else I should check? Maybe fuel isn't getting to the engine or spark plug??
I'll call the dealership and see what they can do. However I just don't think it's the battery, I literally bought it yesterday and it was brand new and kept on a tender. Is there anything else I should check? Maybe fuel isn't getting to the engine or spark plug??
If it just goes click, then it's an electrical problem - starter relay? Just get the bike shop to collect & fix it as it is under warranty. Did you put a meter on the battery to see what reading you have got?
If you do indeed have good battery power and all your connections are good then it can only be the relay or the solenoid on the starter motor. I'd put more money on the former as we know they have been recalled previously
You can bypass the relay to eliminate it from the system and see if the bike goes but I can tell from your replies that maybe your not electrically inclined.

Sounds like a job for your friendly dealer but please let us know what the culprit was as we have invested a lot of emotional energy in this now! :)
Quote.."" please let us know what the culprit was as we have invested a lot of emotional energy in this now! ""

Can you imagine the emotional energy neema has invested....far far more than we ever could. Put you bike on a truck or flatbed and take it to your dealer ASAP.
Haha yeah I wouldn't dare mess with the starter relay. I'll be taking it to the dealership after the weekend and I'll let you all know what it was, thanks a million for the help!
on clutch starting, my cbr250r clutch started after draining
battery thu key in overnight [twice in 3 yrs]..
my street is a nice downslope for 30m before intersection,
with a short run-up in second she fired up and ran
- keeping revs up when stopped -
then riding for 20mins before stopping, on a slope..
repeated same clutch starts for 4 days then tried
starter, she fired up and we went on our way..
[until a year or so later and repeat of that sequence]

so whatever the technical aspects of it,
she will fire up with drained battery
as in key left in overnight..
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on clutch starting, my cbr250r clutch started after draining
battery thu key in overnight [twice in 3 yrs]..
my street is a nice downslope for 30m before intersection,
with a short run-up in second she fired up and ran
- keeping revs up when stopped -
then riding for 20mins before stopping, on a slope..
repeated same clutch starts for 4 days then tried
starter, she fired up and we went on our way..
[until a year or so later and repeat of that sequence]

so whatever the technical aspects of it,
she will fire up with drained battery
as in key left in overnight..
Funny you should say that cos I too once managed to crash start mine down a steep drive way but recently when I drained it again we tried bump starting it on the flat and no go. Which is what I expected as it has an EFI system that needs juice to work so dunno how I got it to start that first time or you could get yours to go. Maybe it only needs a little power to work and running it down a slope gets enough juice up for it to get itself ignited and then the engine takes over?
As long as there is enough power in the battery to run the ecu and injectors it will roll start. In cars the ecu needs at least 10.5 volts these days sometimes more. This is not enough for the starter motor but maybe just enough for a roll start. Sometimes though this can be miss leading. For example when a battery drops a cell it still sometimes shows a little over 10 volts but because a cell has dropped the battery is proper buggered and even a roll start wont do the trick.
first clutch start of cbr250r [key overnight] was just
a response based on previous motorcycles, having zero
experience of fi engines.. but she fired up nicely
just as i expected.. keeping revs up stopped etc..

second clutch start was from only slightly sloped
lane, with a good short run-up, jump on and
drop clutch as weight landed on seat..

the battery was drained both times, with no response,
but otherwise the system was functioning ok..

clutch starting is like other riding skills,
ie, while fairly simple there is a knack to it..
you cant expect it to fire up from just a short
slow push, without sufficient momentum
to override the engine and and mass
into rear tyre..

on a steeper slope 3rd would allow freer
turning of engine etc.. same strong runup
best.. or, a really enthusiastic push
from someone else, if you cant do it..

whatever the electronics etc of it,
mine did start in situation described..
if its an accidental drain, its well worth
the minimal effort of a clutch start..
run, run, run, run, jump on/drop clutch
and boom, youre away..
and it only costs about,
nothing..
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Hey I have the exact same problem right now. Did you get it figured out??
Hey I have the exact same problem right now. Did you get it figured out??
did you every get this figured out
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