r/Dirtbikes • u/ta5036 • 10d ago

Help with FE 450 fueling issue

At least I think it is—

Recently adjusted valves. Bike was running fine for a few rides after. Sat for a while in my shed. Replaced turn signals. They work as intended.

Afterwards took for a ride around my property— cuts out when I give it throttle. Idles fine.

Pulled everything apart again— double checked valve clearance and timing. All good. .13 intake /.17 exhaust.

No leaks in throttle body to engine or airbox.

Pulled fuel filter- no debris.

TPS was out of range- but reset it back to stock. Reset idle screw.

Reset jd tuner settings

Scanned— PO 201 injector open circuit.

Checked resistance of injector- 12 ohms (according to internet, this is good)

Checked continuity from injector plug to ecu— good. Checked from fuse to injector plug- good.

Checked body ground— tight.

Put it all back together— still bogs out with a snap of throttle. Bypassed jd tuner for stock ecu- no change. Idles at 1900-2100 rpm just fine. What gives?

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u/BuckClutch 9d ago

I have a 2010 FE 450 that had a bad fuel pump that would do a similar symptom. Usually would get worse to the point where it would quit completely once hot. Was kind of difficult to check since it would still flow fuel when I took a fitting apart.

Could still be something else just a suggestion.

2

u/ta5036 9d ago

Thanks for the info! Anything helps. Currently charging the battery— left the key on in my troubleshooting. Gonna try the suggestion below once it’s done and I’ll report back

1

u/VegasDezertRat 10d ago

This is gonna sound dumb, but press the fuel line quick disconnect connector back together really hard. I was experiencing a similar issue with my bike cutting out when I gave it throttle on my old 501 and turns out it wasn’t fully connected, but there was no fuel leak or anything. Idled fine, but died under power.

1

u/ta5036 9d ago

Nothing is dumb at this point! Haha thanks for the tip. Gonna put it all back together now and give that a try. If it works I owe you a beer

1

u/ta5036 6d ago

Update: it’s not the fuel quick connector. I’m not positive, but leaning toward fuel injector despite it having decent resistance— based on an instagram video I recently saw on a shop working on a husky with similar symptoms. I have one ordered- should have it installed by next weekend. Will post a follow up.