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Why won't my Bobcat 3400 idle once it is warm?

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2001 rancher 350trx atv. Runs good but no take off power. Give all the gas it hardly goes but when it gets up to speed its pretty fast. Why no take off power on 350cc honda


Could be a handful of things; 2 that you could check and let me know what the outcome is will narrow it down -

1. When was the last clutch replacement done on the bike if any? When your clutch starts to go - one of the symptoms is loss of power at take off.

Here's something you can do and I believe the 350 had a basket as well as a centrifugal clutch if you have an adjustment - there should be a nut on a stud on the front cover of the engine. Front Housing is what it's called. You can't miss the stud - it's on the engine cover that faces forward. That's your clutch adjustment. Hold the stud stationary and loosen the nut - should be a 10 or 12mm - once the nut is backed off - loosen the stud - then go counter clockwise slowly until you start to feel resistance - once you feel resistance - go forward about a 1/4 turn.

That's a standard clutch adjustment for multiple makes & models especially the Foreman, etc. I've got a 2000 TRX450 and that's the clutch adjustment*. If this atv has the hondamatic - or no clutch adjustment stud/nut - I'd pull that front cover off and check the tolerance on your centrifugal clutch.

2. - every 6 months or 500 hours they recommend you check and adjust your valves as needed. No one does it and the valves get out of whack. What could possibly be happening - your valves need adjustment - when you start the bike and until it's really warmed up performance will suffer. Once they bike warms up, heat makes everything expand - and if you're on that threshold - you'll run terrible at first/better as the valves warm up. You'll see this play out everytime you get on it and it hasn't been running in 20 hours.

Could be a carb issue as well, your idle and slow jets could be getting clogged up. Or your pilot screw's o-ring is shot and you're drawing too much air at idle/slow speeds and evens out under demand. Once that happens - you'll probably idle okay/nothing great - putting around will be about the same - but when you're on full throttle your carb pulls from a different jet. Each jet has a job - idle jet, slow jet, fast jet, - if you haven't cleaned the inside of that carb out in awhile - now is the time to do it - if nothing else, you'll have a clean carb and you'll have that knocked off your list.

These aren't the only causes by far - there's a flow chart attached/it's from an 04 TRX400 - Same rules apply. I didn't touch on electrical - but if you check on the things above/need any tips going through the flow chart, etc. feel free to shoot me a message. Glad to help if possible.


All The Best, Justin Lee, 17 South Industries, LLC
2001-rancher-350trx-atv-runs-good-but-4n3y21cmsqpgtsjshk50qfrx-5-0.png

Apr 30, 2016 | ATVs

1 Answer

Polaris ranger 500 efi 4x4 2012: will not idle when first starting up. I have to give it gas to get it moving. once it warms up it is fine. any thoughts?


Sounds like the jets are cloged up you will need to pull off the bole and clean the pre jet and you shuld be fine

Nov 30, 2015 | Polaris 2012 Ranger 500 EFI

1 Answer

How to time an engine in a Bobcat 3400 xl (gas)


Take the spark plug(s) out and bring the top of a piston all the way up to Top Dead Center (TDC) using a pencil, eraser inwards to feel the piston top come up to its maximum travel. The timing chain needs to be aligned to the triangle mark indicator to match the piston position. Then adjust the timing advance according to the mfr's specs.

Oct 17, 2014 | Bobcat 2011 3400XL 4x4

1 Answer

I have a Kymco Mongoose 90 that will not idle when the motor is warmed up.


does it idle up and down at will,,,, and gets worse when hot? (if yes - the valves are too tight!!) maybe a little hard to start...??

The carb may need a professional cleaning!

Jul 25, 2014 | Kymco 2010 Mongoose 90 R

1 Answer

Why is getting hot after changing water pump


Sir,
If you did a clean perfectly clean installation when installing the water pump,there should be no issues with air infiltration. If you are good , OK.

The most common problem over the years that can become an oversight for those around me is how clean the radiators core on the outside are..

Withstanding a change of the fluids and the filters when the pump went together.

Since this is a hydrostatic transmission. The other place that comes to mind is the transmission cooler that is in the loop area. What do say?

Well, a generous soaking of GUNK and or equivalent followed by a extensive pressure wash could make you very happy. Any way you will probably want it running when doing the total wash. We do.

It always made us smile. Here is to a happy chin, soon, too. Take a look. Fare well.

May 16, 2014 | Bobcat 2010 3400 4x4

1 Answer

Clutch stays engaged at idle


Warm the engine up then turn the idle speed down as low as possible to see if it will go into gear. If turning the idle down seems to work, turn the idle back up just enough to support running when the engine is warm. If your engine will not idle well then it may need carb work or other engine work such as a tune up.

Apr 03, 2014 | ATVs

2 Answers

Atv hanging idle


check your float height? sounds like its high and runs normal when cold like the choke is on but when warm its getting too much fuel.

Apr 20, 2017 | Honda 2004 FourTrax Foreman ES

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