Tuning w/ FMF programmer

My bike came fully outfitted with the FMF tuner and whole bunch of other accessories. It's a 2013 WR250R.

I've been running the 3.7g safari tank since I got the bike (it came on it). Two nights ago I swapped it back to the stock tank for better trail riding.

The bike is now running as if it's lean at idle. RPM's are slow to drop, and sometimes just stay pretty high at idle. It had a hard time starting this morning too and idled pretty high for a while.

I used the same fuel injector in both tanks.

Any thoughts on what I should look at, or do I need to just tune it with the FMF? If so, I have no idea how to do that.

I thought buying a fuel injected bike meant I didn't have to worry about this stuff anymore

treitz wrote:

My bike came fully outfitted with the FMF tuner and whole bunch of other accessories. It's a 2013 WR250R.

I've been running the 3.7g safari tank since I got the bike (it came on it). Two nights ago I swapped it back to the stock tank for better trail riding.

The bike is now running as if it's lean at idle. RPM's are slow to drop, and sometimes just stay pretty high at idle. It had a hard time starting this morning too and idled pretty high for a while.

I used the same fuel injector in both tanks.

Any thoughts on what I should look at, or do I need to just tune it with the FMF? If so, I have no idea how to do that.

I thought buying a fuel injected bike meant I didn't have to worry about this stuff anymore

Check to make sure you didn't pinch or trap the fuel line when you installed the tank.

Will do. I think I may have narrowed it down to a vacuum leak.

I forgot that the Safari tank has a vacuum line that I pulled and didn't cap on the bike. Need to see if I can find where it was tapped into on the bike to cap it off.

It sure sounds like a vakuum leak, so I think youre on the right track.