What is the recommended spark plug gap for this engine?

Chances are the spark plug manufacturer has an online application catalogue that also lists spark plug gaps for your brand of spark plug (these sometimes differ slightly from the OE recommendation).

The gap is .040 and is pretty much a standard gap.

distributor --.025"
efi electronics .055"

Call any auto parts store and tell them what you have and they will tell you the gap setting

I'd use the type spark plug recommended by your owners manual, the manual may also give you the gap. There may be a decal under your hood that gives this info. Anywhere you buy sparks will have the gap in the info. For one ngk plug I looked at, it said .043in gap.

Different spark plugs manufacturers may have different gap recommendations.

Hi Faye,

I found this,





Rotax spark plug advisory for ultralight, experimental lightsport, amateur built aircraft.




Rotax 2 stroke aircraft engine spark plugsThe recommended spark plugs for the Rotax 277, Rotax 377, Rotax 447, Rotax 503, Rotax 532, Rotax 582 are the NGK B8ES series or the NGK BR8ES ( the R in the spark plug denotes it is a resistor plug and should be used in all of the CDI ignition engines.



BUT the Bosch points ignition engines should NOT use both a resistor plug and a resistor spark plug cap - use one or the other.

The least expensive option in the long run is the cap as you purchase it once while the resistor plugs cost more than the standard plug each time you buy them.


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Use spark plugs that have a SOLID TIP - DO NOT USE spark plugs that have an aluminum screw on tip. They vibrate loose, the tip wears making a loose cap to plug fit, and can lead to the spark plug arcking across from the cap to the plug. Also the screw on style spark plugs are NOT designed for our applications, the gap is generally set up for .030 to .035 thou. The solid tip spark plugs are set up for a gap of .015 to .020 thou.

Spark plug gap

• Allowable range: 0.4-0.5mm / .015 -.020"



• Optimal: I usually set them to .015 and let them wear out to .019



• This also helps getting the engine started in colder conditions

This was found at

If you're replacing the spark plugs in your car engine, you'll need to set the gap before reseating the spark plug. The gap is the distance electricity arcs between the ground electrode and center electrode. The gap must be set correctly to ensure maximum performance. Here's how to set the gap of a spark plug.

1. Remove the spark plug wires. Use a socket wrench to remove the spark plugs from their chambers.
   
2. Clean the spark plug if you are not replacing it with a new one. Remove all dirt and debris from the spark plug.
   
3. Check the owner's manual for your car (or any appliance with spark plugs) to find out the recommended gap setting.
   
4. Use a gap tool to check the gap of the spark plug. Slip the tool between the ground electrode and center electrode. The gap tool should fit snugly at the recommended gap width indicated on the tool.
   
5. Push the tool between the electrodes a few times to ensure proper gap. If the gap is too wide, push the ground electrode firmly against a flat surface to narrow the gap and then check again with the gap tool.
   
6. Repeat Step 5 as necessary until you reach the correct gap. Reseat the spark plug and reattach the spark plug wires
   

Good Luck

Part Number: R45LTS6
Product Notes:
[Standard Plug-Spark Plug]; .060 GAP
Per Vehicle: 6; Years: 1989-1991

These engines use platinum plugs-you don't gap these type of plugs because you will damage te platinum electrode and cause misfire problems. Make sure you use bosch platinum factory recommended plugs and if he vehicle has more than 75k i would recommend replacing your plug wires as well/

the spark plugs wires are directly located on top of the engine and the spark plugs are down inside the holes in the valve cover itself. I believe there are also 2 coils on top of the engine, which hide two of the spark plug wires which are attached directly to the underside of each coil, remove the coil pull it upward carefully and you will find the spark plugs for those two in the hole underneath the coil for each one. If you decide to replace the plugs, make sure to check the spark plug gap even if they tell you they are pre-gapped as pre-gapped spark plugs are usually gapped for more than one particular car and it may be incorrectly gapped for your specific vehicle. If you decide to also replace the spark plug wires, you will have to purchase the spark plug wires for the underside of each coil seperately because most local auto parts stores only sell 2 spark plug wires in the set that go onto the non-coil attached wires and plugs, and you have to purchase the coil spark plug wires seperately. So all in all you should have 4 spark plug wires, 2 that attach directly underneath the 2 coils, then 2 regular type wires that run to the other spark plugs. If you look at the valve cover and see the wires, you will see what i am saying better. Just don't forget to ask the autoparts store the spark plug gap recommended for you car, and adjust the gap on the plugs as needed. good luck.
Bren H.