Gap for spark plug on a 1985 200e yamaha 3 wheeler 4 stroke

It is a 4 valve, 4 stroke engine so only one of the strokes has both sets or valves closed. The is called the combustion stroke. With the spark plug removed you can turn the engine at the crankshaft bolt. Drop a pencil into the combustion chamber at at TDC you will see the pencil rise to its highest point before it starts to go back down. That is when you measure the valve clearance.

gap at .032" - .035" max

For a 2001 Yamaha F115 4 stroke use NGK Plugs LFR6A-11 gapped between 0.039 and 0.043

Hi,

Firstly, if you are not a mechanical person you should never buy a vehicle that does not run.
However, here are some basic tests.
1. Connect a good battery.
2. Remove the spark plug.
3. Turn the motor using the starter motor or kick starter.
4. check for spark by inserting a new plug into the plug cap. (make sure the plug is grounded).

If the motor turns freely and there is spark, chances are good that the motor will run. This does not mean that the motor is in a good condition. Only with the motor running will you be able to know for sure.

You will now have to source a carb and fit it to the 4 wheeler.
Fitting the carb is not too difficult. Check that the intake manifold is not perished or torn, and remember to use the airfilter.

Enjoy the ride !

Jon