i've got a 98 bearcat 454 and was wondering what happens when the diaphragm in the carb goes for a sh*t.does it get rich ,lean or have other tell tale signs?
thnx.

 

anybody.....?

 

Snowyo,

I believe you are talking about the diaphram that has the needle jet in it? I believe it is operated off a vacum from the carb and acts like a fuel pump on the older models. So if it is torn or leaking I would suspect that the engine would run lean and or be hard to start due to lack of fuel.

It has been my experience that you can usually see a tear or cracking on the diaphram. Plus it can be a real pain to put back together. If it doesn't seat correctly when assembled then it will be like having a hole in it.

What symtoms is the engine doing that you suspect its TU?

Swampy

 

My quad has all of a sudden gotten a serious rich condition,I have tried several different combinations to resolve this but dont get it.I have about ready to throw the towel in on AC products.I've been stung a few 2 many times.

I have cleaned the carb(multiple) times,inline fuel filter,new air filter,just gettin frustrated.I am a maintenance tech so i hate having to concede and take it to somebody else but my head is scratched to the skull bone.

My carb has
142.5 main
40 pilot
5d40 needle
e clip in second slot down from top on needle

could my needle be worn?
main?

 

You probably already know this but if the slide is hanging up at all theres 1 reason.

 

You might also check the mixture screw. I think it should be about 1 3/4 turn out. I usually set mine there after I clean the carb and it does fine. If it is out or in too far then it will cause issues at high or low rpm's.

Also, I think your 454 is now a the 500 AC engine? If so I think they are now using a 138 main jet (at least that is what my 500TRV has). You may also want to check your radiator as overeating or over cooling will cause some issues as well.


Swampy

 

HELLO I DON'T KNOW IF YOU WERE AWARE OF IF OR NOT THERE WAS A RECALL ON THE CARBS ON THAT PARTICULAR MODEL. IT'S SOMETIME, BUT THE FIX THEN WAS A NEW CARB . YOU MIGHT HAVE TO CALL A DEALER. MIKE