Rough Acceleration

Hi, Newbie member. I Purchased VFR800i few weeks back. 2000 MY Grey Import with GEN 5. 30K (miles / km ??) on clock. Have questions about odometers and speedos on imports but first problem. Used to have VF500 F2 which accelerated smoothly over full rev range in all gears. Latest VFR800 very rough/juddery acceleration below 3000rpm in 4th, 5th and 6th. Not too bad in 3rd but once in 4th it shakes and judders terribly when you try to accelerate until you get it spinning above 3500rpm. Acceleration at much higher revs, top speed, handling and deceleration not affected. Have heard that this is quite normal for V4's ??? and others say new leads and caps, caps on there own or spark plugs may be the answer. Others say charging circuit can break down. Anyone any ideas. Thanks.. Crispy

 

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New rider ?? You're lugging the engine. Motorcycle engines in sportish bikes like the VFR need brisk rpm IN A LOWER GEAR to accelerate proppaly they way they were designed.

Full throttle at low rpm in higher gears is not the proppa way to ride, and that's why the transmission is there, to shift down and to avoid lugging the engine! May need to modify riding style, remembering that more revs are fine, and proppa gearing preceeds throttle. If you want acceleration, you need at least about 4500 rpm so that the power curve is closer to its best range.

 

Thanks for posts. My VF500 15 yrs back seemed much smoother and had Fireblade up until 2 yrs ago (1996 RRT). The blade would accelerate nicely in top from 35mph no problem, not that it was intended for that, just nice on occasions to take in the scenery. VFR judders on acceleration, needs to be in 3rd at this speed to get it to accelerate smoothly at which point doing well over 3000rpm. Seems a bit odd for an 800cc motor. There is some service history but no mention of air filter, plugs, leads, fuel filter so I'll attack these first. Will sort out a workshop manual as I guess even these basics are not the simplest of tasks. Any advice?

 

Always stay above 3k rpm and the bike will be happy happy! Mine is the same way. Going below 3000 rpm's in any of he higher gears is luging the motor and that is he roughness you feel......it means downshift

 

Thanks for feedback. Will leave it until above 3k to up shift in taller gears and downshift a bit earlier than I'm used to. Only been out on bike a couple of times since I bought it so now I know it's just one of the bikes characteristics I'm off to do some serious riding, thank heavens for those heated grips!

 

U Need to shift so that you never drop too many rpms in the next higher gear. 5000-6000 revs is usually a fine place to shift up.....unless you're in a big rush and want to risk your license.