Your engine is shot. Rings or valves, probably both, are shot.
yes
The dry weight for a 1997 Yamaha 25 hp is listed at 108 lbs.
Exhaust - album - was created in 1997.
1997
no
1997-2001
400 cc Yamaha engine
yes the crankshafts are the same
The suggested spark plug gap on a 1997 Yamaha YZ 80 is .036. That is the standard gap for most Yamaha small engines.
If you smell gas coming out of the vents when you turn on the heater in your 1997 Ford Contour, it could indicate a fuel leak or an issue with the fuel system. This might be due to a failing fuel line, a damaged fuel injector, or exhaust gases entering the cabin. It's important to address this immediately, as it poses a safety hazard. Have a qualified mechanic inspect the vehicle to diagnose and fix the problem.
There all screwed into the exhaust system / pipes. There about 4 inches long with an electric wire coming out of the top of them.
17 hp