I need to get to the battery on my marauder gz 125 I have unscrewed the side panel but it won't budge

125 seat
https://www.boonstraparts.com/en/parts/mke=suzuki/mdl=gz+125+marauder+1998+2006/prt=seat-front

800 seat looks similar. Seat framing must be same size. Any seat can be made to fit.

https://www.google.com/search?q=Suzuki+Marauder+800+seat

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Under the seat near the battery

yes that is it, fill to the line on the side

Removing a baffle will not harm the engine.

From looking at the picture of the Marauder and knowing alittle bit about motorcycles. They are usually behind a panel about mid part down the bike. There is usually two or three screws that you can loosen to remove the panel and the battery is located there. If your bike is like the standard picture online I would suggest the triangle panel that says gz 800 on it.

hi buddy the picture below will show you the mixture screw unscrew this 1/2 of turns out if still no difference unscrew another 1/2 if getting worse screw in 1/1/2 turns it just play with it budd this is the screw that puts the correct amount of fuel with the air

It is quiet easy, you remove the seat then the fuel tank this will expose the carburetor then its simply a matter of disconecting fuel line and unscrewing attachement screws. why do you need to do this? I would be very careful doing this as any dirt or dust or grime getting in can have huge impact

The Haynes Service and Repair Manual ISBN 1844252787 has the wiring diagrams for GZ 125 Marauders from 1998 to 2005.