Another Highway speed thread worded as a tech question

Riverdale · June 16th, 2015, 03:17 PM

I just started riding my 09 250 more regularly. I have logged about 15 thousand miles on my pregen, but am just getting the feel for the 09. It has a full yoshi exhaust and 990 filter setup. It has been jetted(but not necessarily right).

I know at highway speed, the 250 is wound up around the 9500 mark. On my 04, the throttle response was amazing at that speed, passing someone took nothing. On my 09, it takes me approximately 6 seconds to go from 75-85 mph. It seems to run strong through the whole power band until i get to those speeds. This does seem a bit sluggish right? I wondered if the jetting was wrong maybe, but at those rpms a little slower, it feels strong.

Id love to hear what some peoples thoughts are on this. Thanks!!

csmith12 · June 16th, 2015, 03:21 PM

I own both bikes, sounds about right to me. The pregen is just stronger in that rpm range, differences in the motor. If you want a stronger pull, your gunna have to change gearing... tire size can also make the difference for the very, very sensitive rider. But gearing is less of a commitment and cheaper for the rider that is experimenting.

Riverdale · June 16th, 2015, 03:27 PM

so you would say that 6 seconds to change that 5 mph is about right? I guess i figured with the aftermarket parts, i would be closer to the response of my 04

csmith12 · June 16th, 2015, 03:32 PM

Basically yea,

Running both my 92 250 and my 2010 in the same rpm ranges and feeling for power... the 92 feels like it has more to give up top, but the 2010 has more to give on corner exit.

Many bikes feel like this between generations and brands. After all, your dealing with 30 or less HP here.

I feel similar stuff with my 06 and 08 r6's, the power comes on at different rpm points.

csmith12 · June 16th, 2015, 03:36 PM

Also, if you feel the jetting is off and you can't get it "perfect", a trip to the dyno may be in order to get it sorted.

Motofool · June 16th, 2015, 07:21 PM

Quote:

Originally Posted by Riverdale

................On my 04, the throttle response was amazing at that speed, passing someone took nothing...........

Pre-gen's rule !!!

Have you tried downshifting for passing on the new-gen?
That engine should be delivering maximum torque around 9,750 rpm.

In that range of rpm's, the bike should be accelerating at a rate of 2.47 m/s^2.
Your bike is currently accelerating at a rate of 0.74 m/s^2.

Riverdale · June 16th, 2015, 07:45 PM

downshifting does help of course, but as i should be putting out max power in that area, im not sure i should need to. Its nice to get a feel for what other guys are thinking. I have not yet played with the jets yet because it seems to run so well in town. according to motofool, i should be about 3 times as fast in that range as i am.

johncrist1988 · June 17th, 2015, 08:07 AM

Quote:

Originally Posted by Riverdale

downshifting does help of course, but as i should be putting out max power in that area, im not sure i should need to. Its nice to get a feel for what other guys are thinking. I have not yet played with the jets yet because it seems to run so well in town. according to motofool, i should be about 3 times as fast in that range as i am.

Downshifting would put you in a higher RPM range, wouldn't it? If I had to guess, around 10.5k-11k? Would the marginal amount of increased torque really help there?

Also coming from an 06 Pregen, so please correct me if I'm misunderstanding. I'm also use to WOT in 6th giving me a nice bit of passing speed and distance on the highway.

June 16th, 2015, 03:17 PM	#1
Riverdale ninjette.org member Name: Brandon Location: Kansas Join Date: Aug 2013 Motorcycle(s): 2009 250r. 1983 BMW r100rt Posts: 38	Another Highway speed thread worded as a tech question I just started riding my 09 250 more regularly. I have logged about 15 thousand miles on my pregen, but am just getting the feel for the 09. It has a full yoshi exhaust and 990 filter setup. It has been jetted(but not necessarily right). I know at highway speed, the 250 is wound up around the 9500 mark. On my 04, the throttle response was amazing at that speed, passing someone took nothing. On my 09, it takes me approximately 6 seconds to go from 75-85 mph. It seems to run strong through the whole power band until i get to those speeds. This does seem a bit sluggish right? I wondered if the jetting was wrong maybe, but at those rpms a little slower, it feels strong. Id love to hear what some peoples thoughts are on this. Thanks!!

June 16th, 2015, 03:21 PM	#2
csmith12 The Corner Whisperer Name: Chris (aka Reactor) Location: Northern KY Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much. MOTY 2015, MOTM - Nov '12, Nov '13	I own both bikes, sounds about right to me. The pregen is just stronger in that rpm range, differences in the motor. If you want a stronger pull, your gunna have to change gearing... tire size can also make the difference for the very, very sensitive rider. But gearing is less of a commitment and cheaper for the rider that is experimenting. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

June 16th, 2015, 03:32 PM	#4
csmith12 The Corner Whisperer Name: Chris (aka Reactor) Location: Northern KY Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much. MOTY 2015, MOTM - Nov '12, Nov '13	Basically yea, Running both my 92 250 and my 2010 in the same rpm ranges and feeling for power... the 92 feels like it has more to give up top, but the 2010 has more to give on corner exit. Many bikes feel like this between generations and brands. After all, your dealing with 30 or less HP here. I feel similar stuff with my 06 and 08 r6's, the power comes on at different rpm points. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

June 16th, 2015, 03:36 PM	#5
csmith12 The Corner Whisperer Name: Chris (aka Reactor) Location: Northern KY Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much. MOTY 2015, MOTM - Nov '12, Nov '13	Also, if you feel the jetting is off and you can't get it "perfect", a trip to the dyno may be in order to get it sorted. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

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June 16th, 2015, 03:27 PM	#3
Riverdale ninjette.org member Name: Brandon Location: Kansas Join Date: Aug 2013 Motorcycle(s): 2009 250r. 1983 BMW r100rt Posts: 38	so you would say that 6 seconds to change that 5 mph is about right? I guess i figured with the aftermarket parts, i would be closer to the response of my 04

June 16th, 2015, 07:45 PM	#7
Riverdale ninjette.org member Name: Brandon Location: Kansas Join Date: Aug 2013 Motorcycle(s): 2009 250r. 1983 BMW r100rt Posts: 38	downshifting does help of course, but as i should be putting out max power in that area, im not sure i should need to. Its nice to get a feel for what other guys are thinking. I have not yet played with the jets yet because it seems to run so well in town. according to motofool, i should be about 3 times as fast in that range as i am.