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Old May 22nd, 2020, 12:23 PM   #1
vour
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Top speed of ninja 250r with full exhaust?

So I've read and seen dyno's a full exhaust gives around 5-6 hp for the 250r ninja, stock I know that It can reach 160kmh /100 mph so with full exhaust ,air filter can you get more top speed?Never seen a youtube video with that
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Old May 22nd, 2020, 12:58 PM   #2
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The only modifications I have are an Area-P two into one exhaust and a 15 tooth front sprocket. I have been able to attain 110 mph.
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Old May 22nd, 2020, 01:26 PM   #3
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The only modifications I have are an Area-P two into one exhaust and a 15 tooth front sprocket. I have been able to attain 110 mph.
Full exhaust or slip on?
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Old May 22nd, 2020, 10:43 PM   #4
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Full exhaust required. Muffler not as significant. Tyga full-exhaust makes about 1bhp more than Area-P from dyno-charts I've found.

Actual top-speed of new-gen is ~96mph (106 on factory speedo). I got top-speed figures from several independent magazine tests. It varies +/- couple mph based upon grade of road, wind-speed & direction, altitude, ambient-temperatures and humidity, mirrors folded or not, how tightly you are tucked in with just pinky-fingers on grips, etc. A double-bubble windshield is good for +2-3mph. I measured post-upgrade changes based upon calibrated Trailtech Vapour gauge.

Now, full exhaust along with going 1-size leaner on main-jets to compensate for super-rich factory jetting will get you in neighborhood of 12:1 AFR. Not ragged-edge max-power which occurs @ 13.5:1, but you'll have safety-margin for bad-fuel, hot-weather, mis-firing plugs, etc. Along with snorkel delete, you'll be looking at +20-22% more power. This brings your top-speed to 103mph (113 on speedo).

I'm going to experiment with extra flared sections on fairing ahead of hands to shield arms better. Even with my elbows against tank and pinkies on grips, arms are still exposed. That should be good for another 1-2mph. Also going to put 1" dent on top of tank for my chin; trying to get top of helmet under windshield's top.

Last futzed with by DannoXYZ; May 24th, 2020 at 11:32 AM.
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Old May 23rd, 2020, 05:03 AM   #5
vour
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Quote:
Originally Posted by DannoXYZ View Post
Full exhaust required. Muffler not as significant. Tyga full-exhaust makes about 1bhp more than Area-P from dyno-charts I've found.

Actual top-speed of new-gen is ~96mph (106 on speedo). I got top-speed figures from several independent magazine tests. It varies +/- couple mph based upon grade of road, wind-speed & direction, altitude, ambient-temperatures and humidity, mirrors folded or not, how tightly you are tucked in with just pinky-fingers on grips, etc. A double-bubble windshield is good for +2-3mph. I measured post-upgrade changes based upon calibrated Trailtech Vapour gauge.

Now, full exhaust along with going 1-size leaner on main-jets to compensate for super-rich factory jetting will get you in neighborhood of 12:1 AFR. Not ragged-edge max-power which occurs @ 13.5:1, but you'll have safety-margin for bad-fuel, hot-weather, mis-firing plugs, etc. Along with snorkel delete, you'll be looking at +20-22% more power. This brings your top-speed to 103mph (113 on speedo).

I'm going to experiment with extra flared sections on fairing ahead of hands to shield arms better. Even with my elbows against tank and pinkies on grips, arms are still exposed. That should be good for another 1-2mph. Also going to put 1" dent on top of tank for my chin; trying to get top of helmet under windshield's top.
The ninja 300 has 39 hp and can reach 190 kmh /120 mph with full exhaust we get about the same hp so I was curious if it can reach around that
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Old May 23rd, 2020, 05:18 AM   #6
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Quote:
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The ninja 300 has 39 hp and can reach 190 kmh /120 mph with full exhaust we get about the same hp so I was curious if it can reach around that
How are you calculating speed?

Seems high for an actual (not speedo) reading.
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Old May 23rd, 2020, 05:29 AM   #7
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How are you calculating speed?

Seems high for an actual (not speedo) reading.
Mostly from speedo ,actual speedo reading is false in almost on every bike
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Old May 23rd, 2020, 04:21 PM   #8
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Full exhaust or slip on?
Full exhaust.
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Old May 23rd, 2020, 10:24 PM   #9
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Quote:
Originally Posted by vour View Post
The ninja 300 has 39 hp and can reach 190 kmh /120 mph with full exhaust we get about the same hp so I was curious if it can reach around that
That's most likely speedo-speed, considering that EX500 with significantly more power, 60bhp, reaches actual 187kph/118mph top-speed, Most often radar-tested actual top-speed measured is about 171kph/108mph for 300. But it is heavier and blocks more wind, so souped-up 250 can hang no problem.

Here's video of me going back & forth with my buddy Steve on FLAP Ninja-300. It does have stickier Pirelli tyres. But he doesn't get away from me on straights and we go back & forth couple times.

Dan & Steve - Laguna Seca - Fun starts 6:00 in

Link to original page on YouTube.

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