250ER info

[vintage_snowmobiler]

I just picked up a 250ER, and I am looking for some information about this sled. I found a sticker by the taillight saying to use only 6V bulbs, This isn't a 6V Electrical system is it? Also trying to find a year, and all three years look like they all have the same numbers to them. Also wondering if anyone knows where i can get a carb kit, maybe a fuel pump kit, and an engine gasket set. Any Info about these sleds would be helpful, even if they arn't listed in this post. Thanks

[Mercury]

The 250 is a twelve volt electrical system but the tail light did use 6v bulbs. Step down is in the control unit.