65MPH Tops 2007 Ex250

xomilin · September 5th, 2014, 10:03 PM

Hi, I just purchased an 07 EX250 any for some odd reason Trying to redline as much as I can im unable to get the bike faster than 65MPH (Less than 70 Downhill) Im running full throttle the whole time revving as high as possible before shifting. (We've changed the spark plugs, checked air filter, gas filter..) I've divided a bottle of seafoam into my last two fillups using Premium gas. Mechanics said that we can try putting new jets on, but asking if anyone else has any ideas.. Until 4th Gear maybe third i can redline, after than it drops to 11k Limit Then shifting reaches 9-10k limit then 8k.

crimsondragon · September 5th, 2014, 11:33 PM

Did you check compression?

xomilin · September 6th, 2014, 10:11 AM

I'm unable to check the compression :/

agentbad · September 6th, 2014, 02:34 PM

Check the throttle cable and throttle mechanism on the side of your carbs. Does your bike have any kind of mods? Mileage and how long has been since a valve adjustment?

Motofool · September 6th, 2014, 05:56 PM

Quote:

Originally Posted by xomilin

I'm unable to check the compression :/

Welcome, Tracy !!!

The brakes are dragging, your chain is bad or the torque that your engine develops is lower than normal.

Please, change you mechanic, don't change any jets and read this:
https://www.ninjette.org/forums/showthread.php?t=194109

csmith12 · September 6th, 2014, 05:58 PM

Brakes, yea that is possibility. I got a 10 spot that it is something simple like that.

jkv45 · September 7th, 2014, 07:27 AM

Are both pipes the same temp? What do the plugs look like?

Any chance there's something under the seat blocking the air to the snorkel?

Does it need choke to start?

Drain the floatbowls and look at the fuel that comes out. Is the tank rust-free?

Run Regular (87) gas without ethanol. Only use Premium if you can't get anything lower without ethanol.

snot · September 7th, 2014, 11:41 AM

Just an FYI, our bikes do better on the recommended octane. My likes 89 (recommended) more than 92 or 93.
I would also check the gearing. Some people play with sprocket sizes to fit their needs. It won't make a huge difference but it will make some. Start with the small stuff.

September 5th, 2014, 10:03 PM	#1
xomilin ninjette.org newbie Name: Tracy Location: Louisiana Join Date: Sep 2014 Motorcycle(s): 07 EX250 Posts: 8	65MPH Tops 2007 Ex250 Hi, I just purchased an 07 EX250 any for some odd reason Trying to redline as much as I can im unable to get the bike faster than 65MPH (Less than 70 Downhill) Im running full throttle the whole time revving as high as possible before shifting. (We've changed the spark plugs, checked air filter, gas filter..) I've divided a bottle of seafoam into my last two fillups using Premium gas. Mechanics said that we can try putting new jets on, but asking if anyone else has any ideas.. Until 4th Gear maybe third i can redline, after than it drops to 11k Limit Then shifting reaches 9-10k limit then 8k.

September 6th, 2014, 05:58 PM	#6
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	Brakes, yea that is possibility. I got a 10 spot that it is something simple like that. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

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September 5th, 2014, 11:33 PM	#2
crimsondragon ninjette.org member Name: Tim Location: NJ Join Date: Sep 2013 Motorcycle(s): 2006 Ninja 250 Posts: 47	Did you check compression?

September 6th, 2014, 10:11 AM	#3
xomilin ninjette.org newbie Name: Tracy Location: Louisiana Join Date: Sep 2014 Motorcycle(s): 07 EX250 Posts: 8	I'm unable to check the compression :/

September 6th, 2014, 02:34 PM	#4
agentbad ninjette.org sage Name: bob Location: Earf Join Date: Apr 2013 Motorcycle(s): 2005 Ninja 250, 2006 SV650N Posts: 642	Check the throttle cable and throttle mechanism on the side of your carbs. Does your bike have any kind of mods? Mileage and how long has been since a valve adjustment?

September 7th, 2014, 07:27 AM	#7
jkv45 Rev Limiter Name: Jay Location: WI Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot. MOTM - Jun '18, Oct '16	Are both pipes the same temp? What do the plugs look like? Any chance there's something under the seat blocking the air to the snorkel? Does it need choke to start? Drain the floatbowls and look at the fuel that comes out. Is the tank rust-free? Run Regular (87) gas without ethanol. Only use Premium if you can't get anything lower without ethanol.

September 7th, 2014, 11:41 AM	#8
snot sammich maker Name: snot Location: West Ohio - in the kitchen Join Date: Feb 2012 Motorcycle(s): 2013 white 300, 09 KLX 250 SF, 09 thunder blue 250(traded) Posts: A lot. MOTM - Apr '15	Just an FYI, our bikes do better on the recommended octane. My likes 89 (recommended) more than 92 or 93. I would also check the gearing. Some people play with sprocket sizes to fit their needs. It won't make a huge difference but it will make some. Start with the small stuff.