how good are stock carbs?

[slopoke]

I recently purchased a banshee with a stage IV trinity set up. It has T5 pipes, ported cylinders, cases and 17cc dome head. It produces 175 psi of compression. Stock cyc but not stock bore and no airbox. The problem is when in 6th gear on the big end it seems to just fall off. Not bad but I do notice it surging. It pulls all the gears like a beast till you get to the last bit of sixth. I mean its still pulling but you can feel a surge. It has dtock carbs with 350 mains, the float level is good. Do I need a bigger carb maybe. Seems to just run out of gas. I even thought of putting a high flow petcock in. ANYONE got any sugestions? Do I need to trash stock carbs?

[odaen]

I recently purchased a banshee with a stage IV trinity set up. It has T5 pipes, ported cylinders, cases and 17cc dome head. It produces 175 psi of compression. Stock cyc but not stock bore and no airbox. The problem is when in 6th gear on the big end it seems to just fall off. Not bad but I do notice it surging. It pulls all the gears like a beast till you get to the last bit of sixth. I mean its still pulling but you can feel a surge. It has dtock carbs with 350 mains, the float level is good. Do I need a bigger carb maybe. Seems to just run out of gas. I even thought of putting a high flow petcock in. ANYONE got any sugestions? Do I need to trash stock carbs?

 

I've run them on a couple of bikes, and they work fine for me. The problem is more likely your jetting being just a tad off than your actual carbs. 6th gear puts the heaviest load on your motor, so it shows any problems that could otherwise be masked because your motor isn't working as hard. Might try moving up or down a main size and see how it runs then. Could also try a new set of plugs too.

 

Good luck! :beer:

[slopoke]

I've run them on a couple of bikes, and they work fine for me. The problem is more likely your jetting being just a tad off than your actual carbs. 6th gear puts the heaviest load on your motor, so it shows any problems that could otherwise be masked because your motor isn't working as hard. Might try moving up or down a main size and see how it runs then. Could also try a new set of plugs too.

 

Good luck! :beer:

 

 

That was on new plugs. I just didn't know if the carbs would flow enough cfm and fuel. I know I'm not rich. You think A bigger main may help?

[mopar1rules]

you need to tell him your current jetting setup, altitude, riding temps, and all engine mods, to get good/accurate jetting ballpark.

[okbeast]

Stock carbs are awesome and will run great on alot of setups...until they suddenly crap out for absolutely no reason at all. I'll never run 'em again.

[shee4speed]

another question is what gearing are you running? What do the plugs look like?How do you know your not rich?

[Burt Reynolds]

Our 91 banshee still has the stock carbs,keep em clean and adjusted properly and they are fine.

[slopoke]

Thanks for all the advise. I am going to try to go up a couple sizes on mains and see if it helps. I just didn't want to starve my motor. I am running stock gearing.