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Discussion Starter · #1 ·
Hello from the south! Im a new rider riding an 09 Ninja 250R blacked out with 6500 miles on it aftermarket wise it has a yoshi slip on, 2" lowering kit, fender eliminator, 150 tire on the rear instead of the stock 130, and lastly frame sliders. With the yoshi slip on should i rejet the carbs or leave them? Always open for suggestions on somethin i should do to my bike or modifications that the bike comes with that i should delete! Also my buddy has a 11 ninja 250r and his will run 85 mph at like 9500rpms stock with nuthin done to it mine will barely push 70 at 10,000rpms whats up with that?!

Always looking to get the most out of my bike!​

 

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Welcome!

Some things you could consider would be removing the air snorkal to allow more flow, jetting or shimming the needles. I've also wondered if changing the rear on this bikes will effect performance because of the increase in mass... just a thought.

Sometimes engines differ greatly out of the factory, I had an old car of mine dynoed and when it was completely stock, it was putting out MORE power than in the specs.

Where is the 'south'? How about some pics of your bike in the local area?

Felix







 

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Discussion Starter · #3 ·
Ok if you delete the snorkle is there any negativesif you do? Never thought about the mass of the rear tire either. Yea thanks for the suggestions and
Usa in the southern states, sure ill get some posted here in minute!
Thanks again!
 

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Yeah, changing the sprocket could 'increase the torque', all sprocket changes come at a cost, acceleration or top speed. You would be 'going through the gears' faster, and revving harder in top gear, but if most of your riding is below 60mph then go for it... if you sit on the motorway for 30mins a day, you'd go the other way and make the gears taller so that your revs are lower in top gear.

Really simple calculator.

Also when you changed the rear did it increase the overall diameter of the wheel?

Felix







 

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Hey Dieselfrek,

welcome to NN! Nice bike! Erm, you shouldn't have to rejet with just the yosh. With the snorkel removed as well, you'll want to have the bike dyno-jetted.

top speed - do you have the stock sprockets on the bike still? Or did you buy it used and maybe the previous owner swapped them out? Erm, 70 @ 10K in which gear? top gear (6th)?
 

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Discussion Starter · #13 ·
Hey Dieselfrek,

welcome to NN! Nice bike! Erm, you shouldn't have to rejet with just the yosh. With the snorkel removed as well, you'll want to have the bike dyno-jetted.

top speed - do you have the stock sprockets on the bike still? Or did you buy it used and maybe the previous owner swapped them out? Erm, 70 @ 10K in which gear? top gear (6th)?
Thanks and ok im planning on deleten the snorkel so you suggest i dyno jet it? and im not sure the owner before me said he told me everything aftermarket that was on it or changed, and yes sir top gear and i was talkin to my friend today and he said he was doin 75 at 9000 rpm the other day? Thanks
 

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No performance mods. A few cosmetic details, black fairing bolts, some decals, trimmed the reflector off the tail, rear spools for the stand, added a Hotbodies double bubble wind screen, and built a rack for a Givi topbox that locked down over the pillion.
 

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Thanks and ok im planning on deleten the snorkel so you suggest i dyno jet it? and im not sure the owner before me said he told me everything aftermarket that was on it or changed, and yes sir top gear and i was talkin to my friend today and he said he was doin 75 at 9000 rpm the other day? Thanks
Yes, dyno jet it. That means, don't just buy the dyno jet kit and install it. Take it to a certified dynojet dealer where they can dyno-tune the bike, as in, where they decide which jets to use based on the results shown on the dynomometer....

built a rack for a Givi topbox that locked down over the pillion.
called the contraption and it is glorious! :thumb:
 
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