buzzbomb
Resident Lurker
G'day all,
This is my first post, after much lurking and a few replies here and there.
My question concerns my 05 FZ6 Fazer. The engine has never been as smooth as others have described, with strong vibes around 5,000rpm. I've been spending time doing my own servicing, and have noticed a few things with the adjustment of the idle screw during throttle body syncing.
I use a home made manometer, rigged up with a pressure guage and 4 way connector to read the vacuum of all 4 cylinders at once. I've also used a traditional carbstick to test this, and it has comparable results.
So anyway I read at one stage some people adjust their throttle bodies at around 4,000rpm, and I tried that recently. I adjusted cylinder 3 airscrew to get it even, but then it made the idle uneven.
Next I spent some time redoing the syncing, and revving the engine, and adjusting the idle screw at the same time. This seemed to change the individual cylinders quite a bit, and I used this to get the vacuum even at 5,000rpm. Back to idle, and the screws only needed a small adjustment. Idle was still around 1250rpm.
I haven't had a chance to ride the bike since, to see if it feels any smoother.
I'm curious to know if the throttle sync really can get rid of the vibes, or if I should start checking other things, like spark plugs. I've been running NGK Iridium plugs for the last 20,000km, so I might take them out and see how they look.
Since this is my first 4 cylinder bike, I'm wondering what this subjective "smooth" engine description really means, and if mine is too vibey, or if I'm expecting too much. It doesn't make my fingers or feet numb, but it's still annoying.
Buzzbomb.
PS- I've pretty much worn out the search function on this website looking for tb syncing, and engine vibes. So I thought I'd jump up and ask!
This is my first post, after much lurking and a few replies here and there.
My question concerns my 05 FZ6 Fazer. The engine has never been as smooth as others have described, with strong vibes around 5,000rpm. I've been spending time doing my own servicing, and have noticed a few things with the adjustment of the idle screw during throttle body syncing.
I use a home made manometer, rigged up with a pressure guage and 4 way connector to read the vacuum of all 4 cylinders at once. I've also used a traditional carbstick to test this, and it has comparable results.
So anyway I read at one stage some people adjust their throttle bodies at around 4,000rpm, and I tried that recently. I adjusted cylinder 3 airscrew to get it even, but then it made the idle uneven.
Next I spent some time redoing the syncing, and revving the engine, and adjusting the idle screw at the same time. This seemed to change the individual cylinders quite a bit, and I used this to get the vacuum even at 5,000rpm. Back to idle, and the screws only needed a small adjustment. Idle was still around 1250rpm.
I haven't had a chance to ride the bike since, to see if it feels any smoother.
I'm curious to know if the throttle sync really can get rid of the vibes, or if I should start checking other things, like spark plugs. I've been running NGK Iridium plugs for the last 20,000km, so I might take them out and see how they look.
Since this is my first 4 cylinder bike, I'm wondering what this subjective "smooth" engine description really means, and if mine is too vibey, or if I'm expecting too much. It doesn't make my fingers or feet numb, but it's still annoying.
Buzzbomb.
PS- I've pretty much worn out the search function on this website looking for tb syncing, and engine vibes. So I thought I'd jump up and ask!
