The FZ09 will go down as ine if the best bang for the $$$ bike ever built. The bike is not perfect but very close.
I got a 2008-10 ZX-10 rear shock for $65 off ebay. Then spend another $90.00 for a set of fork springs + 10W fork oil. Suspension is perfect to me. The other issue is the jerky throttle. Removing the throttle play help a bit and the EJK fuel controller that I got ready fix about 90% of the issue. 50 Ft/lb of torque @ 3K rpm take a bit to get use to. Need ro be gentle on the throttle. Theres already some guys that been crashing there bike leaving the dealership. A few more just got over their head. The bike is wicked fast 0-100 mph. Just as fast as most liter bike out there... I read somewhere that the 09 is about 0.1 sec off the Busa @ 100mph.
The next thing on my list is the seat. I will give it a 7/10. All I want to do is removing the down slope a bit.
The bike is all engine... only bad thing I can say about the 09 is its not made to ride 2 up. Unless your girl weight about 100-110 lbs.
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Read that the throttle issue is fixed when in B mode, is that right ? Also, I'm 5' 10 and when I seated on one, I found it taller than the ST.
I barely pushed my ST when I had it; I was hit before I end the break-in period, sniff, sniff ... but somehow, the ST was predictable. Way more torque than the fz6r but very predictable.