Trying to find starter for 12.5 vangard v twin motor. my model number is 9108304 on starter but can't find anything the same.

1.7 liters when you change the filter also.

This is a 12 volt system and the battery should have 12 1/2 volts. Motor running the voltage should be above 13 volts and below 14.5 volts. You will need a battery charge or jump start.

with a volt meter set to DC, pull the wires off of the starter solenoid coil (the small wires) and check for 8 - 12 volts DC at the wires when the key is turned. A poor connection at the solenoid coil will cause slow turning engine cranking or none at all.
If you have 8 - 12 volts there check for voltage to ground on the large cable that goes from the solenoid to the starter motor, one probe on the cable and the other on ground or ( - ) at the battery. Turn the key to start, if you have voltage to the starter motor but it does not turn loosen and retighten the mounting bolts to the starter motor and if that does not help do the same for the engine to ensure you have a good ground. If none of that works your starter motor needs to be replaced, if you have no voltage to the motor the solenoid or battery connections are faulty.
You can also quickly test starter health by conecting a set of jumper cables to a good battery, clamp the neg. to the engine block anywhere and tap the pos. to the starter cable connection from the starter solenoid, if the engine spins over your starter is healthy and the issue is certainly between the key switch and the starter solenoid.

I can walk you through it but too long for here so...Go into Utube and ask the very same question..STARTING WITH UTUBE THEN YOUR QUESTION..some very good sites there..good luck

It can be several problems. It might be that the carburator is loose and when it shakes over rough ground it is sucking air and stalling. If it is something else you might try rubber mounts under the engine to take the vibrations out of it. Also check for loose wires.... there may be a wire grounding out when you travel over rough ground. look for loose connections or frayed wires that might touch metal and cause a ground

This is most likely being caused by one of the safety switches cutting off current flow to the solenoid. turn the key on and jump the solenoid and see if you get spark to the plugs. If so you have a safety switch issue...one is under the seat, one is on the clutch pedal, one is on the reverse position and one is on the blade engagement lever. hope this helps you

Sounds to me like the "overrunning clutch" is bad. You'll have to remove the starter and disassemble it. The starter drive is part #31663-90 according to the latest V-Twin book I have. It may have a different number on your 2000 model.

Those safety switches you mention above is a good first place to look. Possibly the magnetic switch that makes connection with the battery and the starter needs replaced. When you jumped the starter to turn the motor over did you have the key turned to ignition? No spark can come from a low oil shutdown switch located somewhere on the lower part of the engine (either low oil or bad switch), if the key was on. The switch can be bypassed to test its condition. Keep us posted.

model # 12f702-1824e1 mower( that uses weedeater string) had a spring come off the carberator and I don't know where to put it back on.

it sounds like the needle valve is stuck open. This is connected to the float, and when the bowl gets low the float pulls this needle out of its seat and allows fuel to run in. Sometimes tapping on the bowl can resolve this. The needle is usually made of brass and can become corroded from water or from sitting or wintering over. if you take the bowl off you could also clean this up if tapping a little does not resolve the issue.