fuel pump, TPS or what???

TomTom · Jul 23, 2019

When I got the bike it couldnt start cold, I just poured a cc of fuel down the intake and that kept it happy until I did all connectors over.
After doing the connectors over with diclectic grease, issue was gone.
Im just posting the possible issues, not saying this is anyones issue.

Pouring fuel down the intake is a good way to find stuff out, have it starv and pour a cc of fuel in there.

jon andersson · Jul 24, 2019

A long shot but how much oil do you have in your air filter? If you still have that metal mesh in the air filter frame the soaked filter can be squeezed against it when opening the throttle restricting air.

I highly doubt it's that but I heard it can happen when one crack the throttle quickly if that metal mesh is still there.

All kind of symptoms can be had if the electrical system is not good so TomTom's advice is a good one.

tagentry · Oct 5, 2019

Followup: turns out previous owner used aftermarket fuel lines between the FP and regulator in the tank (standard fuel line) instead of the OEM flexi-straw line. The line was crimping resulting in the poor fuel flow. OEM lines in place and it runs like a champ again.

Whosaberg · Feb 6, 2021

TPS sorted it out. CHeers. BMR>

Whosaberg said:
Have a FE390 - 2010. Mine started to do the same thing last summer - ran fine when cold, but started to stall/flameout at technical/low rpm speeds and idle poorly when warmed up.

The first and easiest thing to check is the plug and plug cap as the 70 degrees are hard on them. Check the resistance on the plug cap. It should be 5K ohms. Mine was infinite. I have replaced it. As engines warm, the plug cap (or wire from the coil) will increase resistance markedly. This will cause the misfire and stall. It's a classic. Its the easiest and first thing you should check.

The second is adjust the TPS to .61v. mine was low - .57v

Third - Are your valves adjusted - too large a gap -particularly on the exhaust valves) will cause this (apart from not being good for the valve stems)?

I pulled my fuel pump, but could find no evidence of clogging or the "white stuff" that people have reported on a failing pump. Don't know if it was replaced before I bought it.

I will let you know if this fixes the issue when I have the time to ride it again! Good luck. Get back if you find a solution. Cheers BMR

Noubazor · Feb 7, 2021

for the small filter which is located just before the injector, we can make a modification from ktm

connector : 77707010000

fuel pump, TPS or what???

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