Bike stuttering at constant speeds

[fish]

So, finally got the parts from Thailand, changed the TPS, did a TPS reset and made a testride, at first i thought the problem was fixed but when the bike warmed up the same thing happend again, stuttering at constant speeds......... , could this kind of symptoms come from the drivetrain?

Do you not trust your authorized Honda dealer to run a diagnostics on it?

Fish

[easyrider]

Check ignition circuit. Coil,spark plug.Fuel pressure.

[rvkssl]

I had a recall from the local HONDA dealer, the LED control unit had to be replaced, so i thought that this was the best oportunity to let them take care of the problem.
When i got the bike back, the LED unit was replaced but they couldn't find the fault, the simple reply from the mechanic was: there wasn't any fault stored in the memory, i drove it but couldn't find anything wrong...
It's the same problem i also encouter with my cars, you do a lot of research, swap parts like hell, can't fix the problem and the last resort is the stealer which nicely replies "we couldn't find anything" and oh yeah here is the bill for the troubleshooting.

My next thought is the fuel pump and filter, just ordered it, we will see...

Cheers, Ronald.

[rvkssl]

So, finally got the parts from Thailand, changed the TPS, did a TPS reset and made a testride, at first i thought the problem was fixed but when the bike warmed up the same thing happend again, stuttering at constant speeds......... , could this kind of symptoms come from the drivetrain?

Do you not trust your authorized Honda dealer to run a diagnostics on it?

Fish

No Fish, just paid $40,- for nothing (again)

[DAB]

Checked belt and rollers, bypassed side stand switch, changed spark plug, still no luck...., i also cleaned out de VS sensor, no test ride made yet.
I didn't check the TPS yet Fish, i want to start with the easy stuff before taking all the plastic off ( again )

Is this the original belt. what do you mean by igniter? spark plug or coil.

[rvkssl]

Checked belt and rollers, bypassed side stand switch, changed spark plug, still no luck...., i also cleaned out de VS sensor, no test ride made yet.
I didn't check the TPS yet Fish, i want to start with the easy stuff before taking all the plastic off ( again )

Is this the original belt. what do you mean by igniter?
spark plug or coil.[/quote

Yes, original belt, and i meant the spark plug.

[iceman]

Have you had a look at the air filter? (could not see that mentioned in the thread)

[DAB]

You say stuttering at constant speed, is this any speed? When you inspected the belt did you take any measurements or just a visual check?. Has your maximum speed decreased?

[rvkssl]

You say stuttering at constant speed, is this any speed? When you inspected the belt did you take any measurements or just a visual check?. Has your maximum speed decreased?

It stutters at any speed, mostly when engine is warmed up, i've checked and measured the belt, within limits, maximum speed did not drop, i even checked the engine with belt removed to rule out the drive train, same issue, you can feel the engine stutter running on the center stand.

[iceman]

As you say when warmed up, could be the air temp sensor (this is seperate from the TPS)

[easyrider]

Have you checked fuel pressure?Fuel pump?

[DAB]

Is the spark plug a good colour? I think I would try checking the coil.

[rvkssl]

As you say when warmed up, could be the air temp sensor (this is seperate from the TPS)

Iceman, i think the TPS assy holds 3 sensors including the air temp. sensor, i already replaced it.

[rvkssl]

Have you checked fuel pressure?Fuel pump?

I will replace the fuel pump as soon as it arrives the following days.

[rvkssl]

Is the spark plug a good colour? I think I would try checking the coil.

The spark plug's colour is o.k, i have tried to measure the ignition coil, but my Fluke won't let me...

[DAB]

Could it be that the fuel tank is not venting, Still would have the coil checked as the problem occurs when the engine is warm.

[grndslm]

If it only stutters at constant speeds, then the fix is easy....

Just keep twisting the throttle back and forth!!

Only partly kidding, but I feel after all this trouble you've gone thru, you should be able to describe the problem with a little more detail now. Exactly when does this stuttering happen and/or NOT happen. What does it feel like? Where do you feel it? Does it feel like clutch pads slipping, by chance? Probly not... but ya never know, I guess.

[rvkssl]

Could it be that the fuel tank is not venting, Still would have the coil checked as the problem occurs when the engine is warm.

Thanks DAB, i will do this when the fuel pump doesn't fix the problem.

[rvkssl]

After some other project, personal problems and wintertime i've finally found time to change out the fuel pump, and.........
YES!!!!, Problem solved ! bike rides like a charm again, finally after all these months i'm enjoying my PCX again.

[WhiteNoise]

Rock 'n Roll. Congrats!!