May 15th, 2018, 09:54 AM | #1 |
ninjette.org sage
Name: Timm
Location: West Seneca, NY
Join Date: Oct 2015 Motorcycle(s): 2006 1050 Speed Triple, 2010 250 Ninja racebike, YZF320RR? Racebike Posts: 556
MOTM - Nov '15
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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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May 15th, 2018, 12:13 PM | #2 |
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MOTY - 2018, MOTM - Nov '17
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Wow... 280-lbs... Great work!!!
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May 15th, 2018, 12:17 PM | #3 |
"a legend in my own mind"
Name: maverick9611
Location: Augusta,Georgia
Join Date: May 2017 Motorcycle(s): 2015 moto guzzi norge,2020 aprilia dorsoduro, 2014 yamaha fjr, 85 yamaha fj 1100 Posts: A lot.
MOTM - Feb '18
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all engine mounts line up/ drop in?
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May 15th, 2018, 01:28 PM | #4 |
ninjette.org sage
Name: Timm
Location: West Seneca, NY
Join Date: Oct 2015 Motorcycle(s): 2006 1050 Speed Triple, 2010 250 Ninja racebike, YZF320RR? Racebike Posts: 556
MOTM - Nov '15
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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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May 15th, 2018, 05:08 PM | #5 |
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Name: Rick
Location: Alexandria, Louisiana
Join Date: Jan 2009 Motorcycle(s): 05 Blue Ninja 250 Posts: Too much.
MOTY - 2017, MOTM - Jan '19, Oct '16, May '14
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That is just awesome!
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May 15th, 2018, 05:11 PM | #6 |
ninjette.org sage
Name: John
Location: Appleton, WI
Join Date: Apr 2015 Motorcycle(s): Ninja 300 (race), Ninja 1000 (road) Posts: 504
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Great work, but man... The best part of the 300 was the fuel injection.
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Ninja 300 - CCS Ultralight Thunderbike Racing I want to "like" your post but I can't due to forum rules. Sorry. |
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May 15th, 2018, 05:13 PM | #7 |
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Name: AKA JacRyann
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MOTY - 2018, MOTM - Nov '17
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Yeah, let’s see a dyno chart with AFR.
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May 16th, 2018, 05:44 AM | #8 |
Board Member
Name: ...
Location: WI
Join Date: Dec 2011 Motorcycle(s): 250R (street), 250R (dirt) Posts: A lot.
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Nice work! Can't wait to see it. |
2 out of 2 members found this post helpful. |
May 16th, 2018, 06:16 AM | #9 |
Track Clown
Name: Chris
Location: Kingman, AZ
Join Date: May 2012 Motorcycle(s): '08 250R, 21 MV F3 800, Kawasaki 400 build Posts: A lot.
MOTM - Sep '15
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is it possible to keep the FI?
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May 16th, 2018, 06:32 AM | #10 |
ninjette.org certified postwhore
Name: AKA JacRyann
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MOTY - 2018, MOTM - Nov '17
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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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May 16th, 2018, 05:46 PM | #11 |
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Name: Eric
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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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Top speed 123.369mph. Ohio mile Worlds fastest 250 ninja Last futzed with by Racer x; May 17th, 2018 at 04:58 AM. |
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May 16th, 2018, 10:32 PM | #12 |
"a legend in my own mind"
Name: maverick9611
Location: Augusta,Georgia
Join Date: May 2017 Motorcycle(s): 2015 moto guzzi norge,2020 aprilia dorsoduro, 2014 yamaha fjr, 85 yamaha fj 1100 Posts: A lot.
MOTM - Feb '18
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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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May 18th, 2018, 10:29 AM | #13 |
ninjette.org sage
Name: bruce
Location: northern illinois
Join Date: Jan 2012 Motorcycle(s): Race bikes:08 Ninja 250,11 R6,16 ZX6,SV650.3 HD-1947,2-2003,2010. 1946 Indian and a lot of dirt bikes.2 Posts: 999
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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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May 18th, 2018, 10:30 AM | #14 |
Board Member
Name: ...
Location: WI
Join Date: Dec 2011 Motorcycle(s): 250R (street), 250R (dirt) Posts: A lot.
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May 18th, 2018, 10:46 AM | #15 |
ninjette.org sage
Name: bruce
Location: northern illinois
Join Date: Jan 2012 Motorcycle(s): Race bikes:08 Ninja 250,11 R6,16 ZX6,SV650.3 HD-1947,2-2003,2010. 1946 Indian and a lot of dirt bikes.2 Posts: 999
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May 30th, 2018, 09:12 AM | #16 |
CCS Amateur #501
Name: Dave
Location: Iowa
Join Date: Jun 2015 Motorcycle(s): '09 250 SE 'Booger' Posts: 406
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Any updates on the jetting?
I've got basically a 300 w/ carbs now. With K&N pods, 115 keihin MJ seemed good up top per but dyno. It was a bit off in the 7-10k range with 2 washers under the stock needles. I just changed to 3 washers and the ride around the neighborhood seemed a bit better. I need to get mine to the dyno before Road America. |
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May 30th, 2018, 11:14 AM | #17 | |
ninjette.org sage
Name: Timm
Location: West Seneca, NY
Join Date: Oct 2015 Motorcycle(s): 2006 1050 Speed Triple, 2010 250 Ninja racebike, YZF320RR? Racebike Posts: 556
MOTM - Nov '15
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Quote:
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June 1st, 2018, 10:31 AM | #18 |
ninjette.org certified postwhore
Name: Ant
Location: Wooster
Join Date: Dec 2013 Motorcycle(s): Ducati 999 2012 Ninja 250r Ducati748 Yellow finally running 2003 SV650 S (SOLD) Posts: A lot.
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@tgold,
Good luck with the endurance race! Please post more info on your 300 mod, my wife wants more power from her 250 and she does not fit well on larger bikes. Even the 300 ninja is a bit large for her and I have modified her 250 to her specs. Adding a 300 motor may be my next step so any further feedback is gold---TGOLD!!! Thnak you Ant |
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July 4th, 2018, 11:52 AM | #19 |
CCS Amateur #501
Name: Dave
Location: Iowa
Join Date: Jun 2015 Motorcycle(s): '09 250 SE 'Booger' Posts: 406
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Soooo, with k&n 0990 pods and my 300 cc motor, pump gas (non ethanol), keihin 115s were way rich at Road America 1000 ft elevation 90 degree tenps and high humidity. I switched to 110s and it was better but still rich. Ive got leaner jets ordered .
Looking thru the jetting dbase thread, it seems a lot of 250s ended up with 108s when using the K&N pods. Im guessing air filters are the most important item when it comes to jetting and displacement matters not so much. |
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July 7th, 2018, 06:37 AM | #20 |
CCS Amateur #501
Name: Dave
Location: Iowa
Join Date: Jun 2015 Motorcycle(s): '09 250 SE 'Booger' Posts: 406
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A quick google search showed thats its pretty typical to have to go leaner on the jets when increasing displacement. Hmmm. I sure guessed wrong about that!
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July 7th, 2018, 07:31 AM | #21 |
ninjette.org member
Name: Gumbow
Location: St. Paul MN
Join Date: Sep 2015 Motorcycle(s): 2004 Ninja 250 Posts: 60
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Got to put some pictures man
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August 21st, 2018, 05:43 AM | #22 |
CCS Amateur #501
Name: Dave
Location: Iowa
Join Date: Jun 2015 Motorcycle(s): '09 250 SE 'Booger' Posts: 406
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Update on my jetting- 105 keihin mj & 3 washers was down on power against the other 300s. 108 & 3 washers at the last round was pretty competitive. I may have to try the 110 again but with 3 washers and see how it does.
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August 21st, 2018, 02:09 PM | #23 |
Fighting Texas Aggie '05
Name: Neil
Location: Hutto, TX
Join Date: Feb 2009 Motorcycle(s): '07 ZX6R, '08 Versys, '09 250R Track, '93 F2/F3 Track Posts: A lot.
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interesting results - keep us posted
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August 24th, 2018, 10:00 AM | #24 |
ninjette.org sage
Name: Timm
Location: West Seneca, NY
Join Date: Oct 2015 Motorcycle(s): 2006 1050 Speed Triple, 2010 250 Ninja racebike, YZF320RR? Racebike Posts: 556
MOTM - Nov '15
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I had the bike out on the endurance and the throttle response is a bit too abrupt down low. We placed second in the endurance a couple hours after I crashed in a heat race and knocked myself silly for a minute. Then on Sunday I raced in the rain and had one of the best races of my life and placed second after starting from the back row. Even beat a TZ250
I'm going to go down at least one size on the jetting. Planning to do that when I go out for a play day this weekend. I really have enjoyed the bike but I'm selling it. The competition is just too sporadic in the classes I race around here and track days can be a little frustrating around bigger bikes that park in the corners. The bike has been fantastic though. Probably going back to an SV650 or sticking a KTM 690 motor in my FZR400 chassis. |
1 out of 1 members found this post helpful. |
August 24th, 2018, 10:35 AM | #25 |
Fighting Texas Aggie '05
Name: Neil
Location: Hutto, TX
Join Date: Feb 2009 Motorcycle(s): '07 ZX6R, '08 Versys, '09 250R Track, '93 F2/F3 Track Posts: A lot.
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An FZR690 sounds nuts ..... DO IT
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Keep it rubber side down and enjoy the ride Get healthy - Get Fit - Change Your Life Click Here Or PM Me To Find More - Advocare |
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