Roxor stumbles in 5th gear

[motormd]

22 roxor with 600 miles stumbles in 5th gear @1600 to 2000 rpm. Like its running out of fuel. This only happens in the first 2 miles of operation. The rest of the day is just fine. The misfire seems to be getting a little worse with more miles. I warm the engine up before I take off. But not sure if it's all the way up on temp. I go about 1 mile before I grab 5th gear. So I would think its near full temp. Just weird that its only 5th gear as 4th @the same rpms is fine. Also at full throttle and above 2000 rpms the turbo,engine,or bov rattles pretty loud, but I think that's normal? Not sure, comments on that welcome.

 

[RoxinatorAZ]

My Roxor did the same thing, it would get to about 50 mph and then the power would stop. I had the stage 1 computer upgraded and part of that upgrade is removing the speed governor. I would bet that is your problem. Do the upgrade, it will make your Roxor come alive, you will love it.

 

[motormd]

Did some more testing. At 124 degrees engine temp it still stumbles in 5th. I think the tall 5th gear requires a little richer mix when the engine is not fully warm. So I've found a lean spot in the fuel mapping. At full engine temperature, the engine runs fine and no 5th gear misfires. It appears full temp is about 160 degrees. I would assume the diesel freak tune would probably fix this as well. My Mahindra tractor has a lean spot at 1500 in the winter, so I guess it's just a Mahindra thing. I think they have there engines setup for best fuel economy as my tractor@1500 only uses 3 quarts of fuel per hour at 71 hp.

 

[always_sleepy]

Could be fuel filter. Mine was pretty dirty after only 800miles, I think from just initial breakin. Also try the bleed valve on the top of the fuel filter to let any air out.