Fine tuning main jetting

"daytime the problem doesn't seem as noticeable."...

Ok, have to ask.... :blush:
Not as noticeable but it is present in the day time as well...

Question, in-line fuel filter?
Maybe not flowing through the filter as well at WOT...

You mentioned air filter lube... If you spray them as you had in the past, does problem go away?

All other mentioned from others is good info....

OMR

I must mention one other thing. I recently also set all the float levels using a fuel level gauge. I found each one set on the rich side prior to setting correctly. So that would have leaned it out some too.

Heading to the shop right now for some wrenching. I'll probably ride it to work today and see how things go.

When it comes to pod filters that require oil, I always try to use the same amount and process to eliminate it from the equation. They will always vary in small amounts though, as time goes by.

You might be better served by a set of paper pods. That way you just replace them each season, since thier so cheap anyways.

So your sure that your fuel levels are ok. good.
Make sure the tank is venting. I just flip them upside down and shake, if gas comes out its venting! :laugh:
You dont have to do that of course... Just take the fuel line and put it into a gas canister. Then open the petcock and watch the fuel flow. If the tank empties with a nice thick stream, and not gulping or burbling for air, then the tank is venting fine.

Get those jets... and continue.

Good luck!

savedrider wrote:

I must mention one other thing. I recently also set all the float levels using a fuel level gauge. I found each one set on the rich side prior to setting correctly. So that would have leaned it out some too.

Heading to the shop right now for some wrenching. I'll probably ride it to work today and see how things go.

...recently also set all the float levels using a fuel level gauge....

Hoping this was via the clear tube method (accurate), and NOT the mechanical upside-down-on-the-workbench method (inaccurate).

Good Luck!

Yup, clear tube method!

I pulled each plug to get a read and they are all dry reading light tan to chocolate brown in color. I cleaned the plugs checked gap and reinstalled.

I had the #1 bowl off the bike so before I put it back on I placed a catch container underneath and toggled the fuel tap to see how it flowed. It seems to flow fuel ok, though there was only enough fuel it the tank to check it on reserve.

Next I checked the tank vent. I pulled it apart and cleaned everything. I didn't pay particular attention to how the tank vent was oriented when I removed it, but I had it off in the past and never paid good attention to the way it's supposed to line up. I did notice that there is a right and wrong way to install the piece that fits with 3 small screws. So I've got it back together and I'm fairly confident that the vent is doing it's job.

I gassed up and rode to work today. I flogged it real good on the freeway. It runs good overall and continues to accelerate at WOT, though it feels most responsive at 1/2 to 3/4 throttle. Seems to me like it should pull harder at WOT. It's definitely not unridable, but it makes me wonder if I'm missing some power.

Now we will see what happens tonight on my way home. Air temps will be down and there is always this one little valley where the temps really dip. That's where I've noticed the problem happen consistently.

savedrider wrote:

I pulled each plug to get a read and they are all dry reading light tan to chocolate brown in color. I cleaned the plugs checked gap and reinstalled.

I had the #1 bowl off the bike so before I put it back on I placed a catch container underneath and toggled the fuel tap to see how it flowed. It seems to flow fuel ok, though there was only enough fuel it the tank to check it on reserve.

Next I checked the tank vent. I pulled it apart and cleaned everything. I didn't pay particular attention to how the tank vent was oriented when I removed it, but I had it off in the past and never paid good attention to the way it's supposed to line up. I did notice that there is a right and wrong way to install the piece that fits with 3 small screws. So I've got it back together and I'm fairly confident that the vent is doing it's job.

I gassed up and rode to work today. I flogged it real good on the freeway. It runs good overall and continues to accelerate at WOT, though it feels most responsive at 1/2 to 3/4 throttle. Seems to me like it should pull harder at WOT. It's definitely not unridable, but it makes me wonder if I'm missing some power.

Now we will see what happens tonight on my way home. Air temps will be down and there is always this one little valley where the temps really dip. That's where I've noticed the problem happen consistently.

like has been mentioned....when you hit that little valley and the temps dip a tad, just nudge the choke a little and if it feels good and starts to straighten out, 1 size up on the main....you might have had a couple of different variables, but i think you are down to the last one.....good luck...let us know how ya make out....

Made the run home tonight and rolled to WOT many times. Each time it accelerated well and pulled hard. Overall the bike felt great. I thought I noticed a bit of hesitation about a 1/2 mile before I got off the freeway. I gave it some choke, but it definitely did not make it run better, it felt worse until I turned the choke off.

So for now things seem good. I may have had a tank venting issue. I'll just keep an eye on things and update this thread if anything changes. I usually only ride the Z1 once per week nowadays and I'm going to be taking it out of service for a fork seal job soon.

Thanks to everyone (keith1, Patton, Old Man Rock, mark1122, TeK9iNe, chance) for all your help thus far!