i'll suggest you get the xx to a dyno with AF for a proper tuning

I don't disagree with the idea of having a professional tune a modified machine. In my case I am trying to put this atv back to stock and I am seeing the same running issues stock that I saw with the aftermarket add ons. To me this seems like a "honda" part that has failed or is not working properly. I have cleaned the TPS and I hope to test ride it today. If the problem is still there I will unplug the PC3 and test ride again. I just want this machine to be stock and reliable. Fast does me no good if the engine stalls out once every half mile. I recently sold a 2009 honda rancher 420 with 350 hard hours on it. I wish this 700 with fairly low hours ran as good as that rancher did.

I had a friend with me yesterday on his 450R so I would have something to compare how my 700 was running with. He noticed a fair amount of blackish smoke when we were riding to where the trails and field is. After about 5 minutes he said the smoke was gone. He said seems like its running rich but then cleared up. My question from that is do you guys think the ecm is setup to run rich until the engine reaches a certain temperature?

like an octopus,
splashes black and snaps forward!
He felt threatened by trx 450!

The stalling issues continue. My 700 ran great for about an hour of riding. Then on a long rocky climb it started to run poorly and stalled once or twice. So I decided to remove the PC3. It ran good for about another hour and then stalled several times on some technical riding (log crossings and such). I stopped for lunch and rode another hour with few if any stalling. I am just baffled because the issue is inconsistent. I can't do anything that will repeat the stalling, it just randomly occurs. The big issue is that I usually lead with my riding group but these guys like to keep the chase tight. I am afraid its just a matter of time before this 700 stalls and I get slammed into because I stop moving. I need to solve this or sell this thing and get something else.

http://www.rollinthunderdyno.com/files/DECELL_POP.pdf


Is it stalling on deceleration still? If so like your running the quad pretty good, and you let off all at once, is that's when it stalls and or back fires? Try pulling in the clutch and tapping the throttle as you slow. Some call this cleaning it out, as you decell. If you read the pasted link your quad my be fine. Also could it be a vapor lock issue? I know some have had issues with the billet gas vents clogging.

That is an interesting read. The stalling is on decal. Sometimes after running hard and sometimes just back out of the throttle to slow down a little to ride over a rocky section of trail. I do have a billet vent. I will put the hose back on for the next ride.

my friend,
the clutch is, in my opinion,
and it happens when the engine is warmer,
in deceleration,
You press thr clutch
but it does not detach completely
and engine, "clac"
turns off,
this happened to me too,
is enough half a turn, bolt,
in my case, and solved

Are you tightening the clutch or loosening?

Hello,
tighten it,
how to eliminate freeplay.
I recommend,
only half a turn,
do not overdo it otherwise then slip.
Clutch cable, this engine,
it must really be regulated,
a millimeter,
surgically,
otherwise, or you have slip,
or, you have "clac" when the engine is hot.
Let me know !