FZ-07 Throttle Blipping Issue

[Mellowtonin]

Sudden Loss of Throttle Input [FZ-07]

Your inputs greatly appreciated! :thumbup Let's help me avoid a potential highside:rofl

Issue:
This has occurred 2~3 times now (hard to duplicate), during a downshift with clutch lever pulled in, front brakes engaged, while simultaneously blipping the throttle nothing happens (the engine does not rev up, almost feel as if the throttle is not giving any input or "disconnected" to fueling). Power remains on, engine is still running the same RPM as before the "blip", I normally continue to slow down with brakes then gradually slip the clutch to avoid losing rear traction. After releasing the clutch lever the throttle works as normal.:wtf:wtf


Background:
Bought a used 2015 FZ-07 three months ago, having ridden ~4,500 miles so far (ODO currently at 18,900 mi). Maintenance all up to date, spark plugs replace 2,900 mi ago, applied R6 throttle tube mod, replaced stock handlebar with wider Pro Taper SE bar. Stocking fuel map running with full Akrapovic Ti.

Potential Diagnosis So Far:
After some googling it seemed first year FZ-07s had issues with bike stalling/cutting out with the clutch lever pulled in. Something to do with a faulty clutch switch...but I'm not smart enough to understand the correlation. I have cleaned the clutch switch and its connector with contact cleaner...any ideas guys & gals?

 

[Aware]

You state that the engine runs normally, which means it isn't stalling.

 

[Mellowtonin]

Steve...that is correct! The only common factor which I could recall between all instances of this issue has been that clutch lever is pulled in, but I do not have a stalling/engine cutting out problem [thanks for the help clarifying].

 

[Kawikiwi]

Have you considered getting a fuel map set for your full exhaust? It’s been a while since I’ve tooled around on an FZ-07 but I know those yamahas have some weird throttle issues from factory because of emissions restrictions.

My Theory:

If it’s anything like the FZ-09, they put in a fuel cutoff below 4500rpm, pulling in the clutch will reduce engine speed, thus setting your stock ECU to register it as a no fuel/idle situation. When you are trying to open the throttle, it’s still registering as throttle from idle/below 4500rpms, making the throttle response lag or not register.

Flash the ECU or blip it harder is about all I can suggest.

 

[ichabodnt650]

Is there a lot of slack in your throttle cable?

 

[stangmx13]

Disconnect the clutch switch and c if it still does it? U don’t need it.

Also, I’m surprised u are pulling in the clutch on downshifts enough to activate the switch. There’s no need to pull the lever to the bar. There’s a sweet spots on most engines that’s prob near halfway that allows for the smoothest downshifts and blips with some engine braking and no wheelhop.

 

[kuksul08]

Time to sell it and buy a VStrom

Is this a ride by wire bike or are there cables?

So are you saying the RPM stays and doesn't drop while you have the clutch in? Or is it dropping normally?

 

[ichabodnt650]

Cable, not ride by wire

 

[Mellowtonin]

Is there a lot of slack in your throttle cable?

Ich, I just measured the cable slack again tonight and set it between 3~4 mm. Following Ari's instructions:

youtu.be/zy2dj9VvEdI

Time to sell it and buy a VStrom

Is this a ride by wire bike or are there cables?

So are you saying the RPM stays and doesn't drop while you have the clutch in? Or is it dropping normally?

:laughing:laughing:laughing Right? Grant's been bugging me about gettin' the 'Strom for awhile now:rofl:rofl:rofl

Pardon my poorly written description, "with the clutch-in" the engine behaves normally (RPM drops), every once in a blue moon as I blip the throttle nothing happens (almost as if the throttle cables are suddenly disconnected for a split second). By letting go of the clutch and close throttle/open throttle again somehow fueling returns. It seems to happen when I am trying to cut speed very, very quickly, and am attempting to blip at least 50% or more of the throttle to rev match.

On another note, checked my paper air filter tonight since it has never been serviced (manual said to replace every 24K miles). It was pretty filthy (covered in black grime about 20% of the overall surface), there was also about a teaspoon of the engine oil inside the air filter check hose:

 

[Aware]

" It seems to happen when I am trying to cut speed very, very quickly"

So also braking very hard?

 

[Mellowtonin]

" It seems to happen when I am trying to cut speed very, very quickly"

So also braking very hard?

 

[DTM74]

Have you considered getting a fuel map set for your full exhaust? It’s been a while since I’ve tooled around on an FZ-07 but I know those yamahas have some weird throttle issues from factory because of emissions restrictions.

My Theory:

If it’s anything like the FZ-09, they put in a fuel cutoff below 4500rpm, pulling in the clutch will reduce engine speed, thus setting your stock ECU to register it as a no fuel/idle situation. When you are trying to open the throttle, it’s still registering as throttle from idle/below 4500rpms, making the throttle response lag or not register.

Flash the ECU or blip it harder is about all I can suggest.

+1

When I had my FZ-09, I put a full Akra system and w/out the dB killer in, it ran like shit, i.e. throttle lagged coming off a stop. I had the ECU flashed and it ran so much better.

 

[Aware]

So what could the braking affect?

I guess you checked throttle slack, so any potential fumble that is exacerbated by floppy cables should be dealt with.

Has it happened again since you adjusted the slack?

What about fuel pump? Fuel line? Low fuel level?

 

[kuksul08]

I honestly dont know, and would have to ride it to tell.

It could be a number of things.

 

[FreeRyde]

Needs more B12

 

[Mellowtonin]

Have you considered getting a fuel map set for your full exhaust? It’s been a while since I’ve tooled around on an FZ-07...

Victor, I was thinking about this as well. But no plans on keeping the FZ for too long cause I want to get back to dualsport, really don't want to pay $300 or so to get the ECU flashed (the Akra came with the bike).

So what could the braking affect?

I guess you checked throttle slack...

All good suggestions! Hasn't happened again yet...more miles will tell.

Disconnect the clutch switch and c if it still does it? U don’t need it...

Thanks Rob:thumbup, I will try that if it happens again.

I honestly dont know, and would have to ride it to tell.

It could be a number of things.

That could be arrange, I've always wanted to ride your Hyper:teeth

Needs more B12

Let me go dump a couple capful of Sea Foam first since I have it in the garage:x

 

[kuksul08]

That could be arrange, I've always wanted to ride your Hyper:teeth

You could also just sell the FZ and buy my hyper :teeth