I have a atc90 motor (on an atc70 frame) that I am trying to get running. The carb leaked bad around the bowl gasket so I ordered up a rebuild kit for it. I used all of the parts from the rebuild kit except the needle on the carb slide. It looked fine and those tiny lillte clips are a pain to mess with. I put the atc back togeather and...vroom she fires right up and idles great! I let it warm up good and go to take off on a test ride and...no power. I cant even get it to move foreward. It idles great, but it bogs down if I try to accelerate AT ALL. I can't get the RMP's to come up even when the trike is in nuetral. If you push it to maximum throttle it just dies. Any suggestions?

 

did you have a gander at the main jet when you where in there?

it may be clogged

 

The main jet is clean....in fact it is brand new. Could this be a timing or ignition problem? It seems like a fuel problem to me but the carb looks good.

 

i would take the hose off the carb that goes to the air box start her up and see if gas is spraying out of the carb

 

Sounds like a plugged jet or passageway in the carb,or a very low float level.
Does it seem better, with the choke on?
How many turns out, is the mixture screw?
Does it have an air filter on?
could there be a vacumn leak?
Its doubtful that its a spark or ignition problem....the spark doesnt know or care where the throttle is.

 

I do not have an air cleaner on the machine. The choke acts like a choke should, that is it runs rich when it is cold and dies with the choke on after it warms up. As far as the air screw, I am not sure. When I did the rebuild I just counted the turns down on the old screw before I replaced it. I have adjusted the screw in and out @ idle to find the happy spot. I think my floats may be set to low. Iwill try adjusting them next and post the results.