7250 rpm 71 -72 mph slight down hill with 2 riders.. that's when I had only 100miles on the machine. Now it's 7300 Rpms @ 68 mph on the flats. Just went up a size in tires (27"). Not sure what's  gonna happen now

If you want A LOT more low end grunt and more response, definitely go with the race kit.

Where would one find said race kit?

Directly from CF Moto, the same kit they run at the 12 Heures of La Tuque.

I have it and the différence is awesome.

Check below (page 6) for my post about it

Directly from CF Moto, the same kit they run at the 12 Heures of La Tuque.

I have it and the différence is awesome.

Check below (page 6) for my post about it

Are you the U.S.? I didn't see anything on the CFMOTO site for it. Does it limit the top speed?

I am from Quebec, Canada.
The top speed is the same but the acceleration and response are WAY better and the engine is now very free reving.

I wonder if anyone can get this kit in the states? I'd buy one. I emailed CFMOTO US today about it but I'm not hopeful for a response.

I am sure my Canadian Dealer can have it for you.
You go directly to CF Moto Canada to have more info. Just write ZForce 800RR and you can see the different stage available.

I HAVE SEVERAL WEEKS THAT MY Z8 DOES NOT GIVE ME MORE THAN 65 MILES PER HOUR IN 6000 RMP, MONTHS AGO I CAN GET AROUND 68 AND 70 MILES PER HOUR WITH 7500 APROX.
I APPRECIATE THE HELP TO FIGURING OUT WHERE TO STAR LOOKING THE FAILURE.
IT HAS NO MODIFICACION, IN THE CLUTCH AND IN THE ENGINE. IS STOCK

THANKS

Is this on the speedo or GPS .
What is your mileage ?
6000 rpm is way to low.
That sound like a problem with the secondary.

is on the speedo , 2000 miles (the oil , plugs and air filter are brand new)

what kind of problem in secundary could be ?

because i"m going to check
inyector (wash in lab)
Gas Pressure
wash te acceleration box.
if it continues with the same problem I will change the belt .
any more suggestions

thanks

Check your secondary FIRST .
If dirt have Go there, the nylon will scratch the cam and make the secondary to jam.

I will

Thanks