Posts
48
Joined
5/4/2014
Location
GB
Edited Date/Time
2/23/2019 2:50am
Picked up the bike cheap, would only start with high idle pulled out, if high idle is turned off but you keep the revs up it will run.
Checked the TPS, it was at 0.469. I tried 0.5 and 0.55 without improvement
Replaced the very dirty fuel filter with new
Checked valve clearances
Removed 300ml of gas from the oil!!!!! (not sure how long it was there for?!)
Today after being started/dying 10-15 times the plug fouled, I cleaned it up and it began sparking again but it doesn't seem the best - not sure if a bad plug would cause the idling fault though? Can't get my hands on a plug until Monday.
TPS now sits at 0.5, from cold I can pull the high idle it will idle and then I turn the high idle off and it will idle for around 15 seconds before dying, it will kick first time most times but just refuses to idle. Also if you open the bike right up, let off the throttle and then give it gas again it seems around 30% of the throttle opening doesn't respond almost like it's starved of fuel but once you let the bike catch up then it works as expected. I have attached a video below of how the bike starts/idles.
https://www.youtube.com/watch?v=zr7TwDCzKJw
Checked the TPS, it was at 0.469. I tried 0.5 and 0.55 without improvement
Replaced the very dirty fuel filter with new
Checked valve clearances
Removed 300ml of gas from the oil!!!!! (not sure how long it was there for?!)
Today after being started/dying 10-15 times the plug fouled, I cleaned it up and it began sparking again but it doesn't seem the best - not sure if a bad plug would cause the idling fault though? Can't get my hands on a plug until Monday.
TPS now sits at 0.5, from cold I can pull the high idle it will idle and then I turn the high idle off and it will idle for around 15 seconds before dying, it will kick first time most times but just refuses to idle. Also if you open the bike right up, let off the throttle and then give it gas again it seems around 30% of the throttle opening doesn't respond almost like it's starved of fuel but once you let the bike catch up then it works as expected. I have attached a video below of how the bike starts/idles.
https://www.youtube.com/watch?v=zr7TwDCzKJw
If you cleaned the dirty screen on the fuel pump it probably has debris in the pump or line.
Seen that stall before, fuel starvation.
Crazy how inexpensive the aftermarket pump and screen is.
By it being overly rich are you suggesting it is getting too much fuel? It's difficult because from what I can see Honda do not provide a TPS specification and from what I read online people recommend 0.50 - 0.56 for the TPS setting, at 0.50 it means I am giving it less fuel compared to 0.56?
Interesting, when the high idle is pulled it opens an air passage and then that results in more fuel being sucked through or what? I always thought on the EFI bikes the high idle meant it dumped more fuel in.
The pump seems strong however I have a fuel tank + pump from an RMZ 250 2012 here that I could possibly hook up and see if that makes a difference?
What do you guys make of the video?
The Shop
A leaking fuel injector will cause the fuel in oil issue. It will also cause the bad idle issue.
Low fuel pressure from faulty fuel pump will also cause idle issue.
Also you can adjust the idle speed up to see if that helps.
Paw Paw
Your 4.5 volt reading at the same spot?
If at closed throttle, then the TPS is bad and would be allowing too much fuel to be sprayed by the injector.
Remember that the lower the voltage (IE .62 v) reduces the fuel delivered and the higher voltage (IE 5v) is for max fuel delivery. .62v should be at closed throttle and 5v should be at WOT.
Paw Paw
The bike now starts and idles however it still isn't being fueled properly, if I open the throttle slowly and close it slowly it is fine however if I WOT quickly then close throttle and open it again for 1/4 of the throttle nothing happens it's like dead, like it is running lean(??). I am wondering if this is caused by running the bike without seat/plastics maybe it's getting too much air?
Is it normal to go above the .62 or is it the most I should go? It doesn't back fire at all so doesn't seem to be over fueling
Back fireing is normally from a lean condition.
Clean you injector.
Paw Paw
Is it worth putting some fresh gas in with some sort of injector cleaning and running it through?
I have access to a fuel tank (+pump) from a rmz 250 2012, I could hook that up to the bike and see if that helps but I'm wondering if the 250 has a less powerful pump?
If I go from 10% throttle > 100% it pulls like a train, perfectly fine
If I go from 100% throttle > 0% then around 30% of the throttle is totally unresponsive, almost like I'm not actually opening the throttle then suddenly it will catch up and the throttle will do something.
If I hold revs at around 40% and ride like that then it will start to run weird, jerky and will pop and just not run correctly.
After riding it up and down the yard a few times I rode it a little with the high idle out and it felt no difference at all however I opened the bike up with high idle ON and once I came to a stop the bike died, turned off high idle and it was a bit more difficult to start now compared to before. Since then the bike has ran similar to how it did before I reset the TPS. It really feels like the TPS has moved from 0.62 to 0.55 or something but the bolts are very tight but I will double check it.
Below is a video to show how it was running at the end of the test. It would now take a few kicks to start, sometimes it would idle and sometimes it would just die. When it was revved it was running pretty badly.
https://youtu.be/juy8wZcF_Vk
https://youtu.be/059_9-LuqKw
So currently the TPS should be set at 0.62 (will double check it hasn't somehow changed tomorrow)
I have tested a different fuel tank + pump on the bike from a different bike and it ran the same. (rmz 250 2012)
Anyone out there have any idea? I am starting to run out of ideas now. The only thing I haven't done is properly had the injector cleaned, I am tempted to grab 1L of fresh fuel and mix in some sort of cleaning solution. Is that usually effective on these systems?
Hi there, just wondering if you figured this out?
I have the same issue. I have also adjusted TPS several times. I've tried a tank with pump from another crf450 which was running perfectly, it made no difference to the issue on mine.
Would love to hear how you got on with this !.
As mentioned a couple times above I would pull the injector out of the bike and clean it properly
A friend had an issue that ended up being dirty injector
I literally had to pull the debris out of the injector and that was even after cleaning with my motion pro injector cleaner . You will need a small pick and possibly magnifying glass to see well enough to clean it thoroughly .
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