Backfire after shutoff

The Road Star takes 4.3 qts which is 4.07 liters.

In my experience, MOST Yamaha engines have the oil capacity stamped either near the oil filler cap, or if it has one, near the fisheye inspection glass.

The best advice I have seen to date states the following: Having replaced and tightened the drain plug, remove the dipstick and puur in half the oil. Note that this bike has an oil tank, so having added 2 litres or so, put the dipstick back in and tighten it. Start the bike and allow it to run for around 15 seconds to allow the oil to pump from the oil tank to the engine crankcase. Shut the bike off and add the remaining oil before replacing the dipstick again and checking for leaks.

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please replace float in the carb.

Any oil that is JASO MA certified motorcycle oil. 10w-40 for cold climate. 20w-50 for warm climate/touring. Car oils use different additives. Do not use any oil that says Energy Conserving on the label . It will shorten the life of your wet clutch and transmission gears. If you use Synthetic oils, they will help your bike run cooler and shift easier.

The Yamaha Roadstar has a dry sump oil system. What this means is that the oil is stored in an oil tank to reduce the size of the engine. By storing the oil in the tank (which is under the seat and has the filler cap/dipstick, the engine does not need a sump under the crankshaft to store the oil. In this type of system the oil is pumped back to the tank after making its rounds through the engine. When you shut the bike off the oil will settle in the engine until you run the engine. The procedure to check the oil is to warm up the engine and allow it to idle for approximately 3 minutes. Do not rev up the motor during this time as it will cause the oil level to not read correctly. After shutting off the motor, check the oil level and adjust it to keep it in the proper level on the dipstick.

should just turn the key to the left unless the cable release is broken

Sounds like jetting is to rich, recheck settings and fuel height settings, need to get the fuel mixture correct as that bike will develop other running issues due to carbon build up in the rear cylinder. check out www.roadstarclinic.com as this is a good source for information on this bike

look under the back corners of the seat. I think there are two allen bolts there