[Brent Therrian]

So I just got this Honda trx400fa wont start or run, I changed the oil, oil filter, sparkplug, and cleaned the carb it now will start and idel will die with throttle.
So im instslling a carb kit and I came across this. Should this be plugged? Black rubber plug see picture

 

[shadetree]

yep, black plug must be in the carb !.

 

[Brent Therrian]

Thanks for your fast reply.

 

[Brent Therrian]

Any idea what would be causing not to stay running? Dies when the throttle is pushed wont move on its own power.

 

[shadetree]

Any idea what would be causing not to stay running? Dies when the throttle is pushed wont move on its own power.

dies when throttle is operated tells me the carb has issues , maybe not enough fuel reaching it ?, float needle stuck ?, most times the jets or carb is not clean when this takes place. other times is because the carb is not put together right. you would be amazed how many times I've seen folks rebuild carbs, and do it wrong !..lol. as for it not moving ?, well, this could be anything !, its an automatic, and I have no faith in these models. but !!, if its drive line related ?, then thats where i'd be looking. most times the automatic models have tranny issues, and this is not my expertise at all, other than getting rid of it, and getting rid of it !.

 

[wheelsquad]

I would check all the jet sizes and make sure they match what is spec'd stock. Next, did you install the pilot screw correctly and how many turns out did you set it?

Lastly, it isn't throwing any error codes is it?

Yes the trannies can go out on the 400's, but it happened way less often than it did for the 2001-2004 Rubicon. More often than not in these 400's the clutch goes out, or the oil pump, or a sensor goes and people just jump right to "oh the tranny is toast and you can't repair it". Take your time, follow the service manual, and good luck. Oh and if you do get it running right, do NOT put oversize tires on this one. Heck, I run slightly undersized.

 

[Brent Therrian]

How many turns should the pilot screw be turned out?

 

[shadetree]

How many turns should the pilot screw be turned out?

down load the service manual from our site, its free !.

 

[Brent Therrian]

This came in the new carb kit I did not take one out that looks like it or I dont see it in the service manual.l

 

[shadetree]

This came in the new carb kit I did not take one out that looks like it or I dont see it in the service manual.l

it almost looks like the main jet needle seat ?, is it tapered on one end in the inside ?, and flat with hole on the other ?. what brand name is the carb kit ?. shindy ?, or some china junk from amazon ?.

 

[shadetree]

ok, found it, that is the slow air jet, its under the screw holding the rubber air line, side of carb, once you remove the screw, you will see that part, it has a tiny o-ring on both ends of it, some times one sticks inside the carb when you pull that brass part out.

 

[shadetree]

number # 49 in this fich ----> https://www.partzilla.com/catalog/honda/atv/2005/trx400fa-a-fourtrax-rancher-at/carburetor .

 

[Brent Therrian]

Amazon race-driven.com

 

[shadetree]

Amazon race-driven.com

answered you, # 49 in the fich ( post above ) I linked, slow air jet .