August 19th, 2010, 10:43 PM | #1 |
ninjette.org member
Name: JeFFy
Location: Ventura, CA
Join Date: Jul 2010 Motorcycle(s): 2005 Kawasaki Ninja 250R Posts: 66
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Bike lacks power after installing 15 tooth sprocket...
Installed a 15 tooth front sprocket and MT-75 tires... I have to shift into 5th now to get enough power to pass cars on the freeway. Is this how its supposed to be?
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August 19th, 2010, 11:52 PM | #2 |
old git
Name: Steve
Location: Geneve Switzerland
Join Date: Mar 2009 Motorcycle(s): BMW K1300S Posts: 479
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Increasing the gear ratio will result in slower acceleration you just use a lower gear than before when passing other vehicles. From what I know most of the riders who have chosen the 15 tooth front are riding a lot of highway where it makes sense to drop the rpm a little.
Steve
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August 20th, 2010, 04:37 AM | #3 |
ninjette.org certified postwhore
Name: Jason
Location: Jacksonville, Florida
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Your bike must be black. Everyone knows green is the fastest!
I'm running the 15T on both my 250's. Most traveling here is done on the interstate. I wouldn't say I would have to switch down to 5th unless I needed to pass quickly. Is this the only issue your having?
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August 20th, 2010, 06:22 AM | #4 |
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Name: Frugal
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The sprocket setup multiplies engine torque, and torque is what makes the wheel turn and the bike accelerate. When you increase the front (or reduce the rear) sprocket sizes you reduce the torque multiplication and therefor reduce power available to the rear wheel. That's normal.
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August 20th, 2010, 06:26 AM | #5 |
Ninjette CPT
Name: Vince
Location: jacksonville, fl
Join Date: May 2009 Motorcycle(s): Black 08 250r Posts: A lot.
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jeff,
have you shimmed the needles and pulled the snorkel? if not, that should fix the problem i have 15t, 2 washers, snorkel pulled, stock exhaust - no issues overtaking on the highway. |
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August 20th, 2010, 08:07 AM | #6 |
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Name: Rick
Location: Alexandria, Louisiana
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His bike is a pregen which does not have the snorkel. Shimming the needles though is a good fix. I have a 15T on mine and 3 shims on each needle. It helped acceleration tremendously.
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August 20th, 2010, 08:51 AM | #7 |
Ninjette CPT
Name: Vince
Location: jacksonville, fl
Join Date: May 2009 Motorcycle(s): Black 08 250r Posts: A lot.
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i always forget to check if we're talking about a pregen.....
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August 20th, 2010, 08:54 AM | #8 |
ninjette.org certified postwhore
Name: Rick
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No worries Vince.
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August 20th, 2010, 09:51 AM | #9 | |
ninjette.org member
Name: JeFFy
Location: Ventura, CA
Join Date: Jul 2010 Motorcycle(s): 2005 Kawasaki Ninja 250R Posts: 66
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Quote:
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August 20th, 2010, 10:01 AM | #10 |
ninjette.org certified postwhore
Name: Rick
Location: Alexandria, Louisiana
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Two great threads to read:
http://www.ninjette.org/forums/showthread.php?t=11963 http://www.ninjette.org/forums/showthread.php?t=10208 |
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August 20th, 2010, 01:49 PM | #11 | |
Join Date: Nov 2008 Posts: Too much.
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Quote:
http://www.ninjette.org/forums/showthread.php?t=9465& |
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August 21st, 2010, 01:05 AM | #12 |
CPT Falcon
Name: J.Emmett Turner
Location: Newnan, GA
Join Date: Apr 2009 Motorcycle(s): '08 CP Blue EX250J, '97 unpainted EX250F, 2nd '97 unpainted EX250F (no engine), '07 black EX250F Posts: A lot.
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Yup. Obviously, if everything remained the same at lower RPMs/higher MPG, they'd come that way from the factory!
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August 29th, 2010, 04:37 AM | #13 |
ninjette.org member
Name: Lee
Location: Honolulu
Join Date: Apr 2010 Motorcycle(s): 2005 Ninja 250 Posts: 17
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I went up in the front and I tell you its the best thing I coulda done!!! SOOOOOmuch smoother I also rejetted cuz the douchebag who owned the bike b4 me put the pods on and didnt rejet or tell me about it > I have no problems smoking anything on 4 wheels and I dont even get close to 11k rpms......
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August 29th, 2010, 09:15 AM | #14 |
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Name: Cuong
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What gear did you pass cars on the highway before? I have a 15T and 6th gear will still accelerate 70 mph+, but just not as fast as 5th gear.
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August 29th, 2010, 10:19 AM | #15 |
ninjette.org member
Name: Lee
Location: Honolulu
Join Date: Apr 2010 Motorcycle(s): 2005 Ninja 250 Posts: 17
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5th..... U should remember thAt I live on an island...... people here dont drive like people on the mainland. in 5th at like 8.5k Im passin EVERYBODY
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September 3rd, 2010, 09:13 AM | #16 |
Dead-thread Necromancer!
Name: Levon
Location: Central Texas
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I went with a 15/41 for the highways in Texas. Makes lots of difference when cruising for long stretches. I have to drop a gear to pass, it's just a part of the change. It's a Ninja! It's not like you ever get to ride much without constantly changing gears anyway, it just happens slightly more often!
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September 3rd, 2010, 09:43 AM | #17 |
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Name: -
Location: -
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I like the idea of changing the gearing to get the slightly lower highway cruising RPMs.
It's pretty obvious that if you're going to do this but you still want the bike's original level of performance, that is to say if you want the bike to "feel" the same acceleration-wise, then you've got to increase it's horsepower just a bit. If you added an aftermarket exhaust like the Area P full-system and properly re-jetted the carbs you'd get a boost in power. Then put on the longer gearing and you'll break even on the bike's performance and get the bonus of the nice lower-RPM highway cruise. |
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