1982 GS450T no spark

[Guest]

Hey all. Brand new here! I’ve acquired a GS450t that has been sitting for years. I got a new battery, took apart and cleaned the carbs, oil change, fresh gas and the bike was sounding and running great! Until all of a sudden it died on me while riding and wouldn’t fire back up. I’ve replaced both spark plugs, boots and wires. When I try and start the bike, it sounds like it’s trying to start, so my solenoid should be working. I am trying to rule things out but am coming to a point where I’m not sure what I can do. I opened up my side cover with the electronic points (which apparently are set and I don’t need to adjust per my clymer manual.) and am getting rotation when trying to start. Anyone else experienced this? Any tips/suggestions? I just want to ride, this is my first bike.

thank you in advance!
Lance

[Rich82GS750TZ]

Welcome to the forum. Title of your thread says “no spark”. Are you sure? Here’s how to know. Found this with a quick google. You can probably skip step 2.
Step 1

Park your motorcycle on its side stand, or place it on a service stand, and allow the engine to cool completely.


Step 2

Remove the seat, fuel tank and body panels from the motorcycle to provide access to the engine cylinder head and spark plugs, using an Allen wrench or socket wrench.


Step 3

Pull the spark plug cable cap gently off the spark plug, by hand. Lay the spark plug cable. Unscrew the spark plug from the cylinder head, using a spark plug socket and a socket wrench.


Step 4

Inspect the condition of the spark plug insulator -- the ceramic portion of the spark plug and the electrodes at the tip of the spark plug. Look specifically for cracks in the face of the insulator and the insulator tip near the electrodes, as well as bent or melted electrodes. Replace the spark plug, if there is any damage to either the insulator or electrodes.


Step 5

Look at the general coloration of the spark plug's insulator tip, near the electrodes. Ideally, the insulator should have a light tan color, indicating that the engine and fuel systems are operating properly. A wet-looking, dark brown insulator tip is an indication that the fuel system is running rich, a condition that adds more fuel into the cylinder's combustion chamber, or that the spark plug is not firing. Alternatively, an ashy white insulator indicates a lean condition, or more air than fuel, causing the cylinder to overheat. Do not discard the spark plug at this time.


Step 6

Measure the gap, or the distance between the side and center electrodes at the spark plug's tips, using the appropriately-sized feeler gauge, as directed by your motorcycle's factory service manual. Slide the feeler gauge between the electrodes. You should feel a slight drag as the gauge moves through the gap. Adjust the gap to the factory-specified clearance, using needle-nose pliers, if the feeler moves freely through the electrodes or cannot fit within the gap.


Step 7

Place the spark plug into the spark plug cable cap. Hold the spark plug by the cable cap and press the electrodes gently against the engine cylinder head. Start the engine and watch the gap between the electrodes for a spark. The spark plug is considered good if it is undamaged and a spark appears between the electrode and the cylinder head. Move the spark plug to a different location and try again, if a spark does not appear. If the spark plug does not produce a spark, the ignition coil may be causing the problem.


Step 8

Remove the spark plug from the cable cap. Place an in-line spark plug tester tool into the spark plug cable cap, in lieu of the spark plug. Attach the tool's grounding clamp to the engine cylinder head. Start the engine and watch the tool for a spark within the tool's body. The ignition coil is good if the tool produces a spark. Replace the ignition coil if a spark is not produced within the tool. Replace the spark plug if the ignition coil produces a spark.


Step 9

Screw the spark plug into the engine cylinder, by hand, if the spark plug is in good working condition and produces a spark. Tighten the spark plug to no more than 12 foot-pounds with a torque wrench, unless directed otherwise by your motorcycle's factory service manual.


Test the remaining spark plugs, if any, using the method described above. Replace any damaged or faulty spark plugs. Reinstall the motorcycle's body panels, seat and fuel tank, using an Allen wrench or socket wrench.



Tips

• An ashy white spark plug insulator indicates a lean air/fuel mixture, which generates high temperatures within the engine -- switch the spark plug with another spark plug with a "cooler" heat range.
• Detailed specifications and spark plug replacement instructions specific to your motorcycle can be found in a factory-issued service manual.
• A bright, blue spark is an sign of a healthy ignition and charging system. Charge your motorcycle's battery completely, if the spark has a pale, orange hue.

Warning

• Do not test your motorcycle's spark plug near flammable objects, liquids or gases. The spark, although small, could ignite these materials and cause severe damage or injury.

Items you will need

• Service stand
• Allen wrench set
• Socket wrench and sockets
• Spark plug socket
• Feeler gauges
• Factory service manual
• In-line spark plug tester tool
• Torque wrench