1996 Yamaha Royal Star is stalling what could the problem be?

Answer 1

Please be more specific with your question.

Is it stalling at idle in neutral?

Or, is it stalling in 1st gear with the clutch pulled in?

Or, is it stalling while riding in no specific gear but at an appropriate rpm and torque for that gear?

In neutral:

It may be caused by lack of fuel getting into the cylinders. Check the Fuel pump (you can hear it clicking when you turn the key on if the bike has been sitting for a while), the carburetors (for cleanliness), check also the spark plugs (for carb buildup and replace if necessary). Another thing that you can check is the aircleaner to make sure the cylinders are getting proper air mixture.

Try running the motorcycle with the choke on half way to increase the fuel-air mixture. Does the bike run/sound better? Or, does it bog and smell extremely potent? With the bike running pull the throttle back to about 1/4 to 1/2 way. Listen for any pops (backfires) these could indicate too much fuel in the mixture or (worse case) water in the cylinder. Push the choke back in after the bike has warmed up. Listen to determine if the RPM's are too low. If this is the case adjust the throttle idle (either at the handlebar with the cables or where the throttle cable meets the bracket in between and above the cylinders. Be careful while adjusting this as the cylinders will be hot.

Also,

If the bike stalls as soon as you switch from neutral to 1st (with the clutch pulled in still and the kickstand up) it may be that an electrical safety switch that will not allow the bike to run in gear with the kickstand down has become faulty.

Please resubmit your question with more details.

Thank you.