Do the pilot jets affect more than just idle? I didn't take note, but at around 2000 to 3000 (????) the 700 runs just slightly rough. It has a slight "rumble" sound to it. Are there any other adjustments that would fix it in this rpm range? It hasn't been synched for awhile.
Yes they help in the transition between idle and open. They also help at cruise depending how much throttle is being used. Here's a couple of write ups to get started in understanding the Keihin carbs. http://www.motorcycleproject.com/text/newcarbs01intro.html http://www.motorcycleproject.com/text/keihin_idle_circuits_white_paper.swf There's more at the site, you just have to look around.
Within the 2-3000 range the idle mixture screw setting is still a factor, i believe. These bikes will rumble at low rpms if you improperly demand too much power in too high a gear at too low an rpm by lugging the engine. :sour:
Hmm. I'll have to pay attention to that. Last time I road, it acted like it was loading up when first taking off. After winding it out for a block, it got better. Just seems like something is a little off and has gotten very slightly worse the last 3 times out. I ride it at least once a week. I read somewhere on VFRWorld that you should keep these bikes above 3000, don't remember why and I can't find it again. Is there some truth to that?
IIRC correctly the main reason to keep the rpm's above 3000 was to help keep the oil pressure up. Back when I had my 84 VF1000F the PO of my bike said the increased rpm helped provide higher oil pressure and thus volume to the top end of the motor and was supposed to help prevent premature cam wear.
