What could happen to your motorcycle if the spar plug goes bad???

Question

I HAS ONE SPAR PLUSG AND IS MORE LIKE A SCOOTER THAT GOES 75 MPH

Answer 1

Well, depends on the size and # of cylinders. I now own an H-D FXDWG. I have two cyls., and thank God I have had no trouble yet with the plugs. I had earlier, an XL1200C and had the bad luck of having a plug go on me. I was on the freeway, and I hammered the snot out of the lower end getting to a shop with only one plug. She could hardly keep up with traffic. When I was a poor person (HA! Still am broke, all the time!) I had a GSX 1100. (A Suzuki model.) It had a bad plug. I attributed the problem to the gasoline additives in use in California at the time I was riding it. I put it in for service and the mechanic showed me an oil fouled plug from one of the center cylinders caused by a bad valve. They fixed that, and the bike became too fast for me to handle! I got so scared by the extra performance that I permenantly switched to H-D's. I did not think I had any trouble when that puppy was firing fine on all four cyls. More plugs, less trouble when one goes out. As far as anything bad happening, unless you lose all spark, and don't kick into neutral fast enough when that happens, you should be just fine.

Answer 2

Always give year, make, engine size and model # when asking questions.
If you're talking about a bike with 2 spark plugs per cylinder, nothing much. You might loose a tiny bit of performance and/or gas mileage.

One spark plug - The engine would backfire, be very hard starting (if it still runs) or the engine wouldn't run at all. The cylinder head can get loaded up with carbon - nothing to worry about, no permanent damage. Easily reparable without disassembling the engine.

Answer 3

performance and it wont start..if it's a 2 then nothing much but you should always have a extra one in case one stops working

Answer 4

I had one on my Harley foul out and it ran like a honda