Problems starting CBR300R - Honda CBR 300 Forum
 7Likes
Reply
 
LinkBack Thread Tools
post #1 of 14 Old 06-16-2015, 04:35 AM Thread Starter
Puk
Member
 
Join Date: Oct 2014
Location: Auckland, NZ
Posts: 46
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 24 Post(s)
(Thread Starter)
Problems starting CBR300R

So I've had my CBR300R from new about 6 months and just hit 4500km and so far its been faultless (one random cutout the exception).

Anyway, my bike is garaged every night and the other morning I come to fire it up for work after the weekend and it refuses to start. Goes through the fuel injection part (i think thats what it is, where the taco spins up) but when I try and fire it up, the bike cranks over but doesn't start. I thought fuel, but I'd only filled it up 2 days prior. It was cold that night (6c in the garage) but its been colder and not had issues so dont think it was that. I kept cranking it and giving more throttle but nothing after 15-20 secs. I give up, flustered and thinking of taking the bus, but give it another go and after another 20secs when I thinkt he battery is going to die, it starts to cough then fires up and ran fine.

4 days later leaving work in the afternoon, it struggled to start for 5secs then fired OK and then today it did the same. Not cold at this time, 18c and a different tank of gas.

Any suggestions what might cause it?
Puk is offline  
Sponsored Links
Advertisement
 
post #2 of 14 Old 06-16-2015, 05:03 AM
Senior Member
 
kiwi rider's Avatar
 
Join Date: Aug 2014
Location: Southland, New Zealand
Posts: 5,157
Mentioned: 58 Post(s)
Tagged: 1 Thread(s)
Quoted: 1797 Post(s)
Hey Puk, your sure clocking up some K's on that 300R.
Is it running normally once you get it started? Is it only on a cold start that it sometimes does this?
I'm wondering if the ECU is not metering the fuel/air mixture correctly on a cold start.
At least you have a 24 month warranty to fall back on. Could be a job for your dealer to look at.

2014 CBR300 (sold)
2018 Ninja 400
kiwi rider is online now  
post #3 of 14 Old 06-16-2015, 06:33 AM Thread Starter
Puk
Member
 
Join Date: Oct 2014
Location: Auckland, NZ
Posts: 46
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 24 Post(s)
(Thread Starter)
Quote:
Originally Posted by kiwi rider View Post
Hey Puk, your sure clocking up some K's on that 300R.
Is it running normally once you get it started? Is it only on a cold start that it sometimes does this?
I'm wondering if the ECU is not metering the fuel/air mixture correctly on a cold start.
At least you have a 24 month warranty to fall back on. Could be a job for your dealer to look at.
Ha sure am! Daily commuter for me replacing the bus. North Shore to CBD and back so 40km a day total.

yeah once its fired it runs fine. I think you nailed it with the ECU, that never crossed my mind actually as I was just thinking cold and fuel. When it does fire after the issues it sounded "rough" for a few seconds so yeah, could the ECU playing up. Will take it back to the dealer I think just to be sure.
Puk is offline  
 
post #4 of 14 Old 06-16-2015, 07:43 AM
Senior Member
 
Join Date: Nov 2014
Location: Corning, NY
Posts: 141
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 41 Post(s)
Garage
Someone posted a while ago about their 300 losing power and turning into a choking dog while they were riding it, and when they removed the seat so inspect, they found a small piece of an aftermarket part they had installed that had come loose and got sucked into the air filter. If there is leaves or other debris in there it could be confusing the ECU due to a lack of airflow.
Lyman Babbitt is offline  
post #5 of 14 Old 06-16-2015, 10:34 AM
Super Moderator
 
MotoMike's Avatar
 
Join Date: Oct 2013
Location: 9000 ft. ASL in Colorado, USA
Posts: 2,964
Mentioned: 62 Post(s)
Tagged: 0 Thread(s)
Quoted: 1038 Post(s)
Hard starting is also a symptom of tight valve clearances, so that could be another possibility as to the cause. Check out post#35 here: https://www.cbr300forum.com/forum/war...estions-4.html

“Machines never lie.
Success will always come if they’re really good.
So let’s show the world what we’ve done.
Then they can see the real Honda!”

- Founder Soichiro Honda at the inception of the Honda Collection Hall.




Former Factory Test Rider/Technician

Last edited by MotoMike; 06-16-2015 at 10:38 AM.
MotoMike is offline  
post #6 of 14 Old 06-16-2015, 08:52 PM
Senior Member
 
Fanatic's Avatar
 
Join Date: Nov 2014
Location: Plano, Texas
Posts: 1,389
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 349 Post(s)
Garage
I suppose I've had some similar instances happen about a month ago... But it started up later, and the issue hasn't repeated and has started normally ever since (knock on wood).


2014 Chevrolet Express 2500
2015 Honda Rebel
2016 Toyota Prius C
2016 Lexus GX 460
2017 CBR600RR
Fanatic is offline  
post #7 of 14 Old 09-26-2018, 11:58 AM
Member
 
tbartolo's Avatar
 
Join Date: May 2015
Location: Chicago, IL
Posts: 70
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 29 Post(s)
Garage
Hey guys, thought I would resurrect this one than starting another. Seems like I have been having something similar as of late. It's a '15 with only around 3600 miles, but the bike just cranks and cranks for about 10-15 seconds before firing. Riding it seems okay, not sluggish, no misfiring, nothing out of the usual. It is only starting.

I recently put fresh gas in, changed the oil, checked air filter, everything is new and in spec. Possibly an electrical problem? Though I'm the world's worst electrician. The battery, however, is still the original but still seems to hold charge just fine. I tried checking the spark plug but unfortunately it cannot be taken out without removing the fuel tank, there's just simply not enough room. Looking if anyone has any ideas before venturing down this path.

2016 Honda CBR500R
2015 Honda CB300F

tbartolo is offline  
post #8 of 14 Old 09-26-2018, 09:21 PM
Senior Member
 
kiwi rider's Avatar
 
Join Date: Aug 2014
Location: Southland, New Zealand
Posts: 5,157
Mentioned: 58 Post(s)
Tagged: 1 Thread(s)
Quoted: 1797 Post(s)
Quote:
Originally Posted by tbartolo View Post
Hey guys, thought I would resurrect this one than starting another. Seems like I have been having something similar as of late. It's a '15 with only around 3600 miles, but the bike just cranks and cranks for about 10-15 seconds before firing. Riding it seems okay, not sluggish, no misfiring, nothing out of the usual. It is only starting.

I recently put fresh gas in, changed the oil, checked air filter, everything is new and in spec. Possibly an electrical problem? Though I'm the world's worst electrician. The battery, however, is still the original but still seems to hold charge just fine. I tried checking the spark plug but unfortunately it cannot be taken out without removing the fuel tank, there's just simply not enough room. Looking if anyone has any ideas before venturing down this path.
Unfortunately you really do need to check the plug. Pain I know.
Another cause of poor starting can be valve adjustment out, but you would like to think that at 3600miles it wouldn't be this either.
What color is your pipe tip?
tbartolo likes this.

2014 CBR300 (sold)
2018 Ninja 400
kiwi rider is online now  
post #9 of 14 Old 09-26-2018, 09:46 PM
Senior Member
 
Join Date: Feb 2015
Location: coogee beach nsw australia
Posts: 1,241
Mentioned: 17 Post(s)
Tagged: 0 Thread(s)
Quoted: 289 Post(s)
aside from plug or valves etc, are you using throttle starting?
recommended routine includes no, throttle..
my 3 [one cbr250r] all started first touch
after, discovering and using the no throttle method..
including cold early morning starts [not freezing]..


a general starting hint ive used after leaving the key in
overnight was to clutch start her.. i have a nice sloping road
which makes it easier, but also clutch started her on almost
flat at the other end of my usual runs in those sequences..
as long as you can get a good runup [or someone to push]
i found second or even third on downslopes works well..


also a good idea to use the same petrol outlet if possible
esp one with good thru-put of cars, meaning regular
fills with fresh fuel and less opportunity to settle
in tanks [esp with ethanol blend fuels]..
kiwi rider and tbartolo like this.
shisoshin is offline  
post #10 of 14 Old 09-27-2018, 08:58 AM
Member
 
tbartolo's Avatar
 
Join Date: May 2015
Location: Chicago, IL
Posts: 70
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 29 Post(s)
Garage
Quote:
Originally Posted by kiwi rider View Post
Unfortunately you really do need to check the plug. Pain I know.
Another cause of poor starting can be valve adjustment out, but you would like to think that at 3600miles it wouldn't be this either.
What color is your pipe tip?
I knew it was gonna have to be done, considering the checks are in most of the other boxes haha. As for the pipe tip color I'll have to get back to you. It's been chilling in the back of the garage for the past few days but I'll be working on it later today.

Quote:
Originally Posted by shisoshin View Post
aside from plug or valves etc, are you using throttle starting?
recommended routine includes no, throttle..
my 3 [one cbr250r] all started first touch
after, discovering and using the no throttle method..
including cold early morning starts [not freezing]..


a general starting hint ive used after leaving the key in
overnight was to clutch start her.. i have a nice sloping road
which makes it easier, but also clutch started her on almost
flat at the other end of my usual runs in those sequences..
as long as you can get a good runup [or someone to push]
i found second or even third on downslopes works well..


also a good idea to use the same petrol outlet if possible
esp one with good thru-put of cars, meaning regular
fills with fresh fuel and less opportunity to settle
in tanks [esp with ethanol blend fuels]..
I've never done throttle starting as it always fires on either the first or second crank of the starter. I do always try to use the same fuel station, which is usually pretty busy, but maybe I'm choosing the wrong one! Considering draining the tank and starting over with brand new fresh gas from somewhere else.

As always, thank you gentlemen!
shisoshin likes this.

2016 Honda CBR500R
2015 Honda CB300F

tbartolo is offline  
Reply

User Tag List
kiwi rider

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome