the ground-wire
look on the underhood emissions sticker...the gap is printed on the label.
If you look under the hood there is a placard somewhere that has this information printed on it.
look at the motor it should have the size stamped on it it could be a 70 90 110 125 185s 200s 200m
Look for it on the steering column.
Yes throw it away and never look back
Get a new exhaust, you probably want to look at FMF exhaust but if you get one too big you might have to get it jetted or it wont idol
if your Honda has a v-tech the igniton control should be on the left side of the engine and if it don't then look on the far right of the engine and it should be where the spark pulgs are.
It will have a black cap on it with 4 wires coming out and each wire going to a spark plug. Follow the wires from the spark plugs backward and you will find the distributor.
If you choose NGK, then it is NGK 4929 DPR8EA Nickel Spark Plug. If you want to use other brands, then you have to look for compatible spark plugs using tables of alternative makes. Such tables can be found in the catalogs of major spark plug producers.
All of the spark plug wires go to the distributor. Just follow the wires and you will see the distributor.
facing car from the front..4 3 2 1..the distributer will have a line near where you put number one spark plug..you will have to look in your manual for firing order of distributer.
depending on the engine size they will be located in the sides of the heads. look for a rotor cap and 6 or 8 big wires, depending on the engine, then foller them rihgt down to the spark plugs.