Nope it didn't fix it.
I took it back to the shop in traverse city Michigan and they bought and installed a fmf jet kit and told me it was fixed and charged me another $145.00 and now not only does it have a big bog but also has a serious hesitation at mid throttle.
Jetting D-Base for YZ/WR 250F
Nope it didn't fix it.
Well I have been riding for a little now here in RI and the temps have been around 40-50 degrees. I am running jd jetting. 45 pilot 175 main and blue needle number 3. She was running nice when it was 50 out and the needle clip was in the second from the top position. Now it drops to 40 degrees and I have this massive flat spot before the pipe hits. Not a bog, just feels like no power, I have to flick the clutch to get her out of it. I went to blue three like it says in the directions but it doesn’t seem to have helped.
I am really thinking of going with the 40 power jet just haven’t bought it yet and done the job been to lazy lol. But what else can I do to rid this flat spot? Is it my pilot jet? Should I try a 48? I’m almost ready to ditch the jd needle and run a zuki necj needle. Thanks for any help.
This is a basic copy from the 450 forum but thought it would be useful to us. Please post your jetting specs. Sunruh, can you make this a sticky?
Model (YZ or WR 250F):
Fuel screw (turns out):
Needle model/Clip position:
Airbox lid (on or off):
Altitude where you ride:
Temperature where you ride:
Degree of satisfaction:
I ordered one of these last week and had a chance to try it on Sat. I bought it from JD jetting. It arrived so quickly that the little package in the mailbox took me by surprise....two days. http://www.jdjetting.com/
First of all, I noticed the airscrew being much easier to dial in. Before it took a great deal of concentration to find the point where the idle was just right. This was with any pilot jet I tried between 40 and 50. It could be done, but only within a half turn or so. Now, its pinpoint accurate.
Low end throttle response is much smoother....not weaker, but that transition from slide/pilot to needle is way better. After that, there is not much effect, nor shoudl there be, but the low end response is worth the price of buying one or cutting the stock 7.
This is with the 295 kit, but I noticed the same airscrew difficulty with the stock bike. Not sure how this slide works at lower elevations, but is almost a must have at anything like I ride at (4500).