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Old 12-29-2010, 09:30 PM   #1 (permalink)
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Baby Ninja Testing

OK, so it's a 01 250 Ninja with a Suzuki GN125 engine. Rides great, but working on top speed issues due to interstate commute. 65mph (indicated), new gearing & gps are installed for this weekend's test run. MPG unknown...

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Old 12-30-2010, 04:52 AM   #2 (permalink)
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[QUOTE=greenjoe;211939]OK, so it's a 01 250 Ninja with a Suzuki GN125 engine.QUOTE]

That conversion sounds like a job and a half. Did you do it yourself?
Good luck with your testing.
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Old 12-31-2010, 06:52 PM   #3 (permalink)
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Conversion not too bad bdesj, going fron a liquid twin to an air cooled single was easier than most. Had to make a few things here and there but all worked out. Turns out with all the changes the speedo is within 1+/- Gps speed. Top speed slowed to 60.3 with new gearing; will be freshening up the motor and tuning for next weeks run.
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Old 12-31-2010, 09:40 PM   #4 (permalink)
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Did you do an overhaul to the engine before installing it or any other modifications?
Also, don't interstate highways require that motorcycles be at least 250cc or larger?
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Old 01-01-2011, 12:58 AM   #5 (permalink)
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Very impresive undertaking, in my book!

Ryland, just guessing here, but I`d say that whatever the law is, if the bike was originally a 250 and still LOOKS like a 250, as long as he isn`t holding up traffic he should be able to get away with a smaller (even technically illegal) engine. I guess we`ll find out. Hope he manages to bump that top speed up in order to cover that "not holding up traffic" clause that I just invented
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Old 01-01-2011, 01:04 PM   #6 (permalink)
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Wow, that's quite an interesting swap you did there. I'd love to see pictures of the bike!
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Old 01-01-2011, 05:28 PM   #7 (permalink)
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The smaller engine has been overlooked by almost all, probably do to the multi-color bodywork (this is not a show bike. No mods were done to the engine before installation, I wanted to see if it was going to be worth persuing before throwing much money at it. Boring the cylinder this week for 11:1 wisco +2mm.
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Old 01-02-2011, 10:07 PM   #8 (permalink)
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this is going to be a cool thread. i would also love to see bigger pics of the bike and the engine. pretty interesting throwing a 125cc in an older ninja 250. be great for local commute. let us know what the MPG is when you find out.
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Old 01-02-2011, 10:43 PM   #9 (permalink)
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I have a Honda CB125 and it seems to top out at around 60mph and is around 12hp where your engine appears to be in the 11-11.5hp range in stock form so I wonder if you will get up to 65mph, of course the advantage of the Ninja is that it has light weight wheels and a fairing.
Any idea on the curb weight or any other specs of your bike?
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Old 01-02-2011, 10:50 PM   #10 (permalink)
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I would not get on the Interstates here in my 125 CC Eliminator. The Rebel would be fine with 250CC.

regards
Mech

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