Just picked up an 03 RM 250! Got ??'s

gharmon
Profile picture for user gharmon
Posts
2752
Joined
4/1/2008
Location
Valley, AL, USA
gharmon
Edited Date/Time 1/27/2012 11:55am
Paid an whole $800 dollars for this jewel. It rode great at the track except for this mid throttle skip/hesitancy. At WOT it ran smooth. But at part throttle it kind of spit and sputtered. What is most likely the fix for this. I assume a jet change issue is in the future. What should I look at? What jet most likely controls this area of the throttle? It idles ok and WOT is good, cranks good. Where to start?

Thanks,

Gerald
|
mx5471
Profile picture for user mx5471
Posts
985
Joined
7/10/2008
Location
USA
mx5471 3/10/2011 11:29am
3/10/2011 11:29am
I would start by moving the needle clip up or down 1 position and see what happens before I would change the jet.
mxb2
Profile picture for user mxb2
Posts
22437
Joined
6/15/2010
Location
Bowie, MD, USA
mxb2 3/10/2011 11:43am
3/10/2011 11:43am
Jetting, good fuel, put some c12 in that thing with maxima 927! pipe and silencer, v force reeds, let her rip!
gharmon
Profile picture for user gharmon
Posts
2752
Joined
4/1/2008
Location
Valley, AL, USA
gharmon 3/10/2011 2:56pm
3/10/2011 2:56pm
mxb2 wrote:
Jetting, good fuel, put some c12 in that thing with maxima 927! pipe and silencer, v force reeds, let her rip!
Already has a FMF pipe with a stock silencer. Would the Vforce help my problem or was that just a performace improvement
mxb2
Profile picture for user mxb2
Posts
22437
Joined
6/15/2010
Location
Bowie, MD, USA
mxb2 3/10/2011 3:24pm
3/10/2011 3:24pm
Probably both, but more for performance! make sure air filter is clean and has a good seal!, My buddy has a 03 for sale like 20 hrs on it, wish you could have got it! $1500, like new. stock with some ugly graphics, he s in the service, never rides it.

The Shop

See All »
OldTiddler
Profile picture for user OldTiddler
Posts
630
Joined
4/16/2007
Location
Longwood, FL, USA
OldTiddler 3/11/2011 5:22am
3/11/2011 5:22am
If it runs good at WOT but sputters at part throttle it is probably either a jetting issue, or less likely a problem with the exhaust valve or ignition.

Run the the bike at 1/4 throttle and do all the usual things: check the plug, look for smoke and put your hand behind the silencer and see if it gets spattered with oil, then kill it. Wet, oily and smoky exhaust and plug means rich. If its rich, drop the needle jet (raise the clip a position or two). If it's still rich, replace the pilot jet with the next smaller size, then repeat tests. If it's not rich but sputtering, look at the manual for how to diagnose ignition and exhaust valve problems.
Flatliner
Profile picture for user Flatliner
Posts
4277
Joined
11/3/2009
Location
CA
Flatliner 3/12/2011 10:39am
3/12/2011 10:39am
I ride the same bike.

Best Bike I've ever cornered on, and the list includes a new rmz 250.
captmoto
Profile picture for user captmoto
Posts
5893
Joined
4/22/2009
Location
Rancho Cucamonga, CA, USA
captmoto 3/12/2011 8:28pm
3/12/2011 8:28pm
Clean everything, power valves, filter, carb, check float level, reeds, fresh plug, check all wire connections including kill button. Whats really cool is you can do all this for about $50. I'm looking for a killer deal lke that out here in Cali.

Post a reply to: Just picked up an 03 RM 250! Got ??'s