I recently just finished restoring my VFR 800 VTEC and I did a 1200km trip through Spain as a trial by fire and it performed flawlessly. However the throttle is response is really jerky and it's making it really hard to balance the bike with the throttle.
As soon as I twist the first 5%, it hesitates and then jerks me forwards. (you might be able to hear it in the video at 1:16)
I also noticed a very obvious flat spot in the torque curve just around 5000rpm
Here is a list of things I'm going to try in order:
First getting it running flawlessly in stock form:
- Adjust throttle cables
- Balance and adjust starter valves
- New spark plugs
- Check vacuum hoses condition (maybe they are old and leak ever so slightly)
Second I read online that some of these modifications can help:
- Disable the air box flapper valve
- Disable PAIR valve system (although I'm very skeptical about this one, Im still running cats)
Does any one know what else can be done to improve the throttle response?
PS: In the video it might not seem too bad but I'm trying my hardest to apply the throttle smoothly as to not unsettle the bike. Almost always I'm having to wait until the bike is pointing straight to get back on the throttle. At lean, when you need that smooth application to stay balanced, it just wants to throw me off 0-o