390 FE misfire and more

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Joined
Jun 1, 2016
Messages
2
Location
Sweden
Update: problem solved, thank you all for the help!

Changed the fuel filter and cleaned the injector, ran better but not perfect, borrowed a "know good" injector from a friend and it run perfect again.
Did a few more tries to get my injector to run but ended up just buying a new one, can´t let the trails wait for to loong ;) ;)


Hello guys.

My Berg (140h) has developed a bad misfire and wont run on idle, hot or cold.
It sputters and misfires/backfires and makes all kind of strange noises when you try to keep a steady pace ( low gas ), runs ok if I give it gas but nothing amazing.

I think it might be fuel related but hopeing for your thoughts!
It starts right up but sometimes needs a little gas, it also stalls if u stop somewhere. It stops with a strange "poof" sound like a backfire.

Video below shows the bike "cold" ( been on a few times maybe 2 min or so) as you can hear its not sounding to good :(

https://youtu.be/_lazPMY6YcI

*POOF*

Regards

//Thomas
 
Last edited:
Fuel filter(s) or injector dirty 1st likely ones to check. Other possibilities - fuel pump, nasty gas from ethanol/sitting too long.

Good luck
 
about the same behavior my starded doing last weekend...
among with other things...

will pull off the pre-injector filter and check it/switch it out
will probably also clean the injector again
 
Start with easy items first
1, new spark plug
2, run the bike at night look for arching from the spark plug boot , they are known to go bad.
3, Check the Throttle position sensor , info on line
 
Thank you guys for your guesses, they where basicly the same as mine, time to get going :)
 
One other thing you can do is pour fuel into the intake tract.
With a different problem this helped me understand it lacked fuel as when I added like 1cc of gas manually into the intake tract it would run normally for as long as the fuel lasted, very easy and cheap 'Felsökning'.
Take seat and filter off, find a small cap and add a small amount of fuel, then just pour it in there while its misbehaving and see what gives.

Lycka till!
 

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