June 29th, 2010, 10:47 PM | #1 |
ninjette.org member
Name: Jordan
Location: Corte Madera
Join Date: Jun 2009 Motorcycle(s): 06 Ninja 650R, 08 Ninja 250R, 00 Aprilia SR50 (dead) Posts: 94
|
Having power problems while running track speeds...
So I have been here for awhile, and as many may know or not...I race AFM with the boys (and girls) there.
I have a 2008 250R. So I have been experiencing some major problems I can't seem to diagnose lately. I just got back from a 2 day intermediate school with Keigwin@theTrack...it was great...but... Monday it was 103 degrees...and Tueday 100... When my bike got hot, especially during the mid to late day the bike was running TERRIBLE! No power in the mid range (8-9.5K) and not much better on the top end...bike seems to vibrate much harder in the clipons and the foot pegs and had noticable power loss...not enough to stall or anything but where I decided to bring it in... Had the same problem at the last race, where by mid race the bike was piping hot but had noticable lack of punch... I have a the Factory Pro Jet kit (92 mains, switched to 96 mains didn't seem to help any...), Yoshimura Full exhaust, and Sportisi Ait Filter... I thought it might be the BRT CDI, but I switched back to the stock CDI and as soon as the bike got really hot out there...same problem came back... Any suggestions on what to look for? Bike has about 5 race weekends and 4 trackdays on it... |
|
June 30th, 2010, 12:07 AM | #2 |
ninjette.org Monkey Spank
Name: Kevin
Location: Illinois
Join Date: Apr 2009 Motorcycle(s): 2008 250R Track-Bike Woodcraft clip-ons and rearsets FZ-6 track bike Posts: A lot.
|
is the bike overheating?? do you have a temp gauge installed?? My first thought is that your way too lean on the fuel and or your mixture screws need adjusting. did you sync up the carbs?? have you checked the plugs?? is the cooling fan working??
lets start with those questions anyway. the more info you can give the better.
__________________________________________________
Black 250R Full Area P QC Dyno Jet Kit 100 main 41T Rear Sprocket |
|
June 30th, 2010, 12:11 AM | #3 |
ninjette.org dude
Name: 1 guess :-)
Location: SF Bay Area
Join Date: Jun 2008 Motorcycle(s): '13 Ninja 300 (white, the fastest color!), '13 R1200RT, '14 CRF250L, '12 TT-R125LE Posts: Too much.
Blog Entries: 7
|
I think you're bike's just trying to tell you that running Thunderhill when it's over 100 degrees out is generally a bad idea all around.
Kidding. Sort of. Hope you can sort out its issues...
__________________________________________________
Montgomery Street Motorcycle Club / cal24.com / crf250l.org / ninjette.org ninjette.org Terms of Service Shopping for motorcycle parts or equipment? Come here first. The friendliest Ninja 250R/300/400 forum on the internet! (especially Unregistered) |
|
June 30th, 2010, 07:05 AM | #4 |
Pimpin
Name: Richard
Location: Ninja 250 Whorehouse
Join Date: Nov 2008 Motorcycle(s): Bunch of em Posts: 973
|
Do you still have the fan installed? I've run in 110 degree temps without fan and thermostat, and it was running very hot - around 265 degrees. Bike ran fine, though.
92 jets seem really, really lean. You rejetted to 96 and it made no difference? Have you checked your spark plugs to see if they're fried? |
|
June 30th, 2010, 08:28 AM | #5 |
ninjette.org member
Name: Jordan
Location: Corte Madera
Join Date: Jun 2009 Motorcycle(s): 06 Ninja 650R, 08 Ninja 250R, 00 Aprilia SR50 (dead) Posts: 94
|
I don't have the bike...it's at my dad's. But I will get it back today and do the usuall tear down and check what was suggested...
I do not have a temp gauge...how do I install one, that would be great... Factory Pro had told me to install 90 Mains...so the 92.5 seemed more than enough...but I had only time yesterday to put one 96 Main in...(thank you Matt Grey for being there with what I needed...)but that I guess doesn't mean much...I will check the plugs and go from there... My dad had 92.5 in his and my bro-in-law had 95s and didn't seem to have the problem...but I know each bike is unique... The carbs have never been sync'd and the mixture screws were set at 2.5 turns when I jetted it...needles at middle clip... So I will start with plugs I guess and report back from there... BTW...the headers seemed really blue on the top...which I know means lean...but one guy told me there that as air gets hot there is less of it, so he ususally steps DOWN a main, so I was even more confused...misinformation? |
|
June 30th, 2010, 12:41 PM | #6 | |
Join Date: Nov 2008 Posts: Too much.
|
Quote:
checking the plugs would tell you a lot. |
|
|
June 30th, 2010, 04:58 PM | #7 |
ninjette.org member
Name: Jordan
Location: Corte Madera
Join Date: Jun 2009 Motorcycle(s): 06 Ninja 650R, 08 Ninja 250R, 00 Aprilia SR50 (dead) Posts: 94
|
So I might go to the 96 mains and see what happens...
|
|
June 30th, 2010, 05:32 PM | #8 |
Join Date: Nov 2008 Posts: Too much.
|
yes, at least 2 of the same jets would be preferred.
have you made any changes to the intake/exhaust? Usually the 98s that come stock work well after the engines have been "opened up" a bit with intake and exhaust changes. be sure to check your plugs to get a glimpse of engine health at this point. can't say what possible damage occurred when the bike was running "funny", but reading the plugs will. |
|
June 30th, 2010, 08:53 PM | #9 |
ninjette.org member
Name: Jordan
Location: Corte Madera
Join Date: Jun 2009 Motorcycle(s): 06 Ninja 650R, 08 Ninja 250R, 00 Aprilia SR50 (dead) Posts: 94
|
I didn't get to open up the bike today...but I bought some new plugs...figured if I pull the old ones out, might as well drop new ones in...
How often to the racers on this board change their plugs out? I'll still report the plug findings tomorrow when I pull them...pics too if I need to... |
|
June 30th, 2010, 09:29 PM | #10 |
The Sportisi Master
Name: Matt
Location: Chico
Join Date: May 2009 Motorcycle(s): 2008 Ninja 250 Posts: A lot.
|
Most guys change them rarely Jordan.
__________________________________________________
Sportisimoto USA is born. |
|
July 1st, 2010, 10:12 AM | #11 | |
212
Name: Lisa
Location: Houston, TX
Join Date: Dec 2009 Motorcycle(s): 09 250R, 09 ZX6R Posts: 121
|
Here is some advice I was given when asking about jetting and elevation changes on the CMRA forum..
Quote:
__________________________________________________
Lisa www.212decals.com Custom Decals for your bike! Support a fellow racer! |
|
|
July 1st, 2010, 11:30 AM | #12 |
Join Date: Nov 2008 Posts: Too much.
|
|
|
July 1st, 2010, 11:40 AM | #13 |
The Sportisi Master
Name: Matt
Location: Chico
Join Date: May 2009 Motorcycle(s): 2008 Ninja 250 Posts: A lot.
|
Thats Dean Thimjon he is my CMRA guy and hes a wizard with his understanding of the 250's. Hands down knows more about these new gen bikes than anyone.
__________________________________________________
Sportisimoto USA is born. |
|
July 20th, 2010, 11:53 AM | #14 |
ninjette.org member
Name: Jordan
Location: Corte Madera
Join Date: Jun 2009 Motorcycle(s): 06 Ninja 650R, 08 Ninja 250R, 00 Aprilia SR50 (dead) Posts: 94
|
So the plugs looked okay. But it appears I should have stuck with my 90 mains or 92s. I will run the bike with the 96s and just see what happens. I am thinking maybe the voltage regulator is getting really hot and maybe not working as well as it should. Any ideas?
Posted via Mobile Device |
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Braking power at different speeds? | Miles_Prower | Riding Skills | 3 | July 5th, 2012 02:47 PM |
Problems getting bike running | jschatte | 1986 - 2007 Ninja 250R Tech Talk | 5 | April 22nd, 2012 12:34 PM |
handling characteristics at track speeds | ratlab | Ninjettes At Speed | 6 | August 21st, 2011 11:34 AM |
Bike has problems running.. | hieuster | 2008 - 2012 Ninja 250R Tech Talk | 3 | June 19th, 2010 06:19 PM |
Problems running, seems very rich? | maxedpenny | 2008 - 2012 Ninja 250R Tech Talk | 7 | June 30th, 2009 08:51 PM |
|
|