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Old May 15th, 2018, 09:54 AM   #1
tgold
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MOTM - Nov '15
Dropped a 300 Motor into my 250

I found a 300 Ninja motor with 1300 miles on it and I put it in my 250 racebike. I decided to keep it simple and use the carbs and the ignition rotor from the 250. Went to bigger main jets on the carbs. One thing of note: it is necessary to the ignition pickup from the 300 and splice it into the 250 wiring. This is because the 250 pickup winds up being just a little too close to the rotor if you try to use the 300 Ninja engine cover.

Carburetion seems to be in the ballpark with a 115 or 120 main jet. Maybe a litte fat, but I'll see when I do the tuning at Pittrace on Sunday.

Not sure if I like the clutch on the 300. Feels way too light at the lever. I'm considering throwing the whole assembly from my 250 motor in it. No need for a slipper clutch with this bike anyway and I'm skeptical of the 3 spring clutch being up to the job.

I'm also trying out some 125 slicks to see how they work on the bike. They save 6 pounds of weight over a set of A-13's in just about the best place possible. I have a set of A-13's waiting in the wings is the slicks don't work.

If I replace my several-times-repaired heavy-a** fairing I could get the total bike weight under 280lbs.
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Old May 15th, 2018, 12:13 PM   #2
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MOTM - Nov '17
Wow... 280-lbs... Great work!!!
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Old May 15th, 2018, 12:17 PM   #3
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MOTM - Feb '18
all engine mounts line up/ drop in?
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Old May 15th, 2018, 01:28 PM   #4
tgold
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MOTM - Nov '15
Quote:
Originally Posted by maverick9611 View Post
all engine mounts line up/ drop in?
Piece of cake with the mounts.

The hardest thing was modifying my Area P exhaust to clear the oil filter. I had to cut the exhaust head pipes where they attach to the head and weld in a 3/4" section of tubing and reweld it back on to the header to get enough clearance. I also wrapped that section of the pipe with exhaust insulation wrap. Fortunately I have a TIG welder and the tubing in the right size at hand.

My advice would be to save a bunch of hassle and just buy a good aftermarket exhaust (like the Area P) that's made for the 300. That way you don't risk screwing up the tuning. I'll find out if I did whenever I put it on the dyno

All of the rest of the issues were very minor. I'll list them when I get a chance.
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Old May 15th, 2018, 05:08 PM   #5
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That is just awesome!
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Old May 15th, 2018, 05:11 PM   #6
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Great work, but man... The best part of the 300 was the fuel injection.
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Old May 15th, 2018, 05:13 PM   #7
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MOTM - Nov '17
Yeah, let’s see a dyno chart with AFR.
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Old May 16th, 2018, 05:44 AM   #8
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Nice work! Can't wait to see it.
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Old May 16th, 2018, 06:16 AM   #9
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MOTM - Sep '15
is it possible to keep the FI?
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Old May 16th, 2018, 06:32 AM   #10
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MOTM - Nov '17
Quote:
Originally Posted by cbinker View Post
is it possible to keep the FI?
Yep, requires additional parts from 300 that didn’t come on 250:

- ECU
- harness
- throttle-bodies w/injectors
- fuel-pump
- tank conversion
- MAP, air-temp, coolant-temp, TPS sensors
- etc...

I made shopping list to convert pre-gen to EFI with Microsquirt and it’s quite extensive.
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Old May 16th, 2018, 05:46 PM   #11
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MOTM - Feb '16
I love fuel injection . I work on it everyday as a technician. But carbs just plain old work. If you have FI keep it. Definilty better than carbs . But to convert to it. But a bike with it and go from there. Just my 1 cent. Maybe two.

Dying to see the dyno on this setup.
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Old May 16th, 2018, 10:32 PM   #12
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MOTM - Feb '18
but carbs have been around a long time. still amazed all it does. the real challenge is with pods trying to get the combo. great write up.
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Old May 18th, 2018, 10:29 AM   #13
bruce71198
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I'd like to compare dyno results when your done. I have 2 of these conversions, both carbureted. Your jetting sounds close.
Also, you can use the 250 flywheel and side cover if need be.

Last futzed with by bruce71198; May 18th, 2018 at 10:34 AM. Reason: left out info
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Old May 18th, 2018, 10:30 AM   #14
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Quote:
Originally Posted by bruce71198 View Post
I'd like to compare dyno results when your done. I have 2 of these conversions, both carbureted. Your jetting sounds close.
....and one nasty [good] 300+ cc custom right?
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Old May 18th, 2018, 10:46 AM   #15
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Quote:
Originally Posted by mgentz View Post
....and one nasty [good] 300+ cc custom right?
Yes, i've built several versions;315,335,346,354cc.
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