New X300 puffs black smoke at warm start

[TreasureHunter11]

My new X300 starts fine cold with no choke,I start it like the manual states at 1/2 throttle and idle for a minute before operating.i noticed today I took a break from mowing,stopped the mower reduced throttle to 1/2 or maybe a bit lower for a few seconds and shut it off.Restarted it and noticed a quick puff of black smoke and it run uneven for 20 seconds.It seems to cut fine... I had 2.7 hours on it with the fuel tank full,it now has 3.4 hours and looking at the tank it is a tad below the first mark,Guessing this is about 45 minutes.Not sure if this is normal fuel usage,my grass was not high and I have no slopes. Are these three marks on the tank gallon marks? Any tips or advice would be great.

 

[MRCo.]

Black smoke is fuel smoke. I'd idle it all the way down before turning off to make sure fuel isn't feeding in to th cylinder while it moves after you turn it off. The rough running is probably excess fuel being burned out. If it continues I'd think to look at the carb to see if it's feeding fuel through.

 

[TreasureHunter11]

Thanks,I'll try that instead of 1/2 throttle shut downs

 

[ridesno4llfe]

Black smoke is fuel smoke. I'd idle it all the way down before turning off to make sure fuel isn't feeding in to th cylinder while it moves after you turn it off. The rough running is probably excess fuel being burned out. If it continues I'd think to look at the carb to see if it's feeding fuel through.

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Id check the owners manual. I know the d100 series have you go full throttle before shut down per the manual. Half or low results in a backfire and a hard restart. It goes against basic knowledge but it works.

 

[TreasureHunter11]

X300 manual states half throttle for a couple of seconds...

 

[ridesno4llfe]

X300 manual states half throttle for a couple of seconds...

Hmm well experiment with both full and idle otherwise the carb is flooding when you start it.

Edit late night typo

 

[TreasureHunter11]

Spoke with my dealer and he said try throttle down fully when shutting it down but made no difference.I noticed if I shut it off hot and walk back in say 5 minutes to restart it will puff some fuel "black" smoke and run uneven until I throttle it up,if I wait 20 minutes it runs fine.Something to do with heat?

 

[Retiredcarguy]

My new X300......... I had 2.7 hours on it with the fuel tank full,it now has 3.4 hours and looking at the tank it is a tad below the first mark,Guessing this is about 45 minutes.Not sure if this is normal fuel usage,my grass was not high and I have no slopes. Are these three marks on the tank gallon marks? Any tips or advice would be great.

Your fuel tank electric gauge is non linear, meaning the indicated fuel quantity levels may not be actual and it will vary. Your fuel consumption per hour calculations may certainly vary by load and usage. The easiest is your gallon/hour calculation, affected by load and state of tune of your motor.

Establish a fuel consumption baseline for your new John Deere. Fill the tank and document your engine hours, then fill again after an extended usage and then calculate your gallon/hour baseline. The electric fuel gauge reading in your tractor may be very erratic. Hash marks on tanks are usually correct, only if level and fully visible.

 

[TreasureHunter11]

Anybody else with a X300 have flooding issues or black fuel smoke during warm restarts? Mine only does this when hot,if allowed to cool for 30 minutes it does not have this issue nor at cold starts.During hot restarts I get a puff of black smoke and it runs a little rough until I throttle it up and the engine levels out.Tried shutting it down at mid and low throttle and it makes no difference.Although I never use the choke,it appears to be open and not sticking.It only has 6 hours on it,spoke with my dealer and he said if it gets worse bring it in which I'll likely do

 

[Retiredcarguy]

If it is under warranty or dealer policy have them fix it!