Jerky and Stalling

[Effie]

I have a 2014 Forza NSS300. Recently, it's been jerking and stalling quite a bit. It mainly jerks when I hit bumps in the pavement, but it also happens when I'm going uphill. The stalling happens most often at red lights, but recently it's been following the jerks. I'd appreciate any ideas/suggestions. Thank you very much!

[fish]

Spark plug or cap, engine ground wire, battery terminal, fuel pump terminal --- loose?
Seems electrical - connection bad - affected by bumps.
Fish

[davenowherejones]

I recently had problems with my 2014 which I think were due to mud & crap in my sidestand switch.

I put the side stand up and down a few times to get going again.

I ride in a lot of lousy weather.

[aguim]

Fish, plus 100Kkm Dave may be right. With no MIL signal mentioned, look for what they say.
If things get more complicated, I have all EFI data, codes and such, all owner available, at the
disposal.

My own wild guess: batt. loose connector.

[easyrider]

All of the above..also CDI box

[aguim]

Forza's ignition is actually Battery-and-coil type, triggered by a CKP (crank position sensor).
CKP is 110 ohms under the right side-cover red plug, but Honda gives no diagnostic code for it, I
have no idea why.

Any other ignition/injection component having an issue should have the Engine Light automatically
going On, flashing its proper code (ex: 3 long blinks followed by 3 short ones = code 33 = ECU
issue. There are 9 different codes provided :(1) MAP sensor, (7) Engine Coolant Temp sensor,
(8) TPS sensor, (9) Intake Air Temp sensor, (12) Injector circuit, (21) Oxigen sensor, (29) Idle
Speed Control Valve circuit, (33) see above, and (54) tip-over ignition kill sensor.

Any problem with any of those sensors should blink a code, automatically.

Since there's no mention by the owner of any MIL blinking, there shouldn't be any problem with
any sensor, except the CKP, which must be checked both cold and hot with an ohmmeter (110 ohms
+/- 10%).

I'd rather look for a faulty connection somewhere ( and here starts the fun, guys -- I once had
a brand new Yamaha with a broken wire INSIDE the main harness that would jerk the ignition like
mad, took me a week to figure that one out).

Usually, guys with such problems just disappear...

[aguim]

Note : I don't use grimacing petit bonhommes, so where the hell this one comes from...

[glencoeman]

Check that the rear brake is not sticking as they are often neglected because the caliper is not easy to get at for maintenance.

[MBMyer]

Mine was hesitating and stalling while rolling along the surface streets recently. We had had many weeks of nearly constant rain, and it felt to me the way a car with a dirty fuel filter does. So I filled up and added some top-end/injector cleaner. The problem went away immediately. My fuel efficiency was down while running through that tank of gas, but with the next tankful the mileage was back up and the hesitation is still gone.

Pax et bonum,
Michael

[Oldie]

Better check that it's had the fuel pump recall done.

https://www.cyclevin.com/honda-grom-125 ... mp-recall/