1990. 300 Honda fourtrax wont run no spark !!! Should the diode by handle bars be open or closed ? A fuse is closed unless bad, just wondering !!! Thanks 4- ur help!!!

Diode for which circuit ?

Tires need bal. or brakes could be rubbing

Diodes are a one way circuit ( a sort of non return valve so to speak for electricity) IF it is good it will be continuous circuit one way and an open circuit the other . You ,mention handle bars so I take it that you are talking motor bike. There is a kill switch on the handle bars that is an emergency stop for the engine and it is very easy to turn it off when manouvering the bike . Check this is on or there will be no ignition circuit.

is the CEL check engine light out running? (it comes on stalled, and is normal that)
stalled. engine stall. no year, now that makes this 10x impossible
and even more impossible no engine stated, (displacement or VIN)
F22? 2.3. 2.7? 3.0L?
if in usa, (no loctation stated ) open hood, look up, see tag?
see vacuum EPA map, see engine type? bingo.

so I wall answer in the generic, (ALL CARS gasoline)
fails hot or cold engine, does hot engine reach 180F and hold?
wow, how low was the oil, off end of stick, none?
stalling is caused by over 50+ things. (we do tests to find it fast )
we use tools, do you have tools, or can buy them, or do you just want
endless guessing. here is the path.
#1 stall maker is a stuck open EGR main valve, ignored during the turn up, clean it. make sure it close
in the macro,
1: bad engine, the hot engine can lose compression and stall.
tool1 the $20buck compression guage.
2: bad spark, or timed wrong. gapped plugs wrong, wrong plugs used. bad wires sets, (old dizzy engines) bad COPS newer cars.
check for hot spark at all spark plugs, skip none.
3: bad fueling (too much or not enough
if engine runs perfect and only idle is too low 800 hot is normal
no DTC 300s misfires, then maybe the ISC is just dirty.
we clean the EGR and ISC every time.
if the EGR leaks, the fast right foot can save a stall but is hard.
if the ISC sticks closed, saving the stall is piece of cake, super easy
after all , you are adding the missing air.

does that help,. no, then take it top the man, the ASE man.
The Mechanic.with the ASE patch on his /her sleeve.
no year, ouch.

Check the obvious - igniter coil for open/weak spark.

the car wont start? do you mean the engine wont turn over or it wont fire or run? if the car does not run but it turn over, check the basic..see if you have sparks and fuel, then check all your fuse pertaining to engine and ignition. the car need to have both thing in order for the engine to run. If you getting both sparks and fuel you engine may have jump time especially with older car with high miles, it the sign timing belt getting worn, you don't want it to break. if you don't get fire from spark plug then you may have a bad coil,distubutor,rotor or timing sensor. if you get no fuel, fuse blown, bad fuel pump relay or fuel pump it self. hope that help some ..good luck

Is it the automatic door?If it is check the fuses

No!

Where is the cdi box located??