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Suzuki Bandit valve blown?

swoop812010-06-04 04:17:03 +0000 #1
I started up my 97 Bandit 1200 yesterday and there was a small bang, like pffaaaft and it started to backfire continuously. I rode it home and googled a bit. Backfiring is due to improper combustion. I checked the battery terminals were secure (I had problems with that with a previous bike before). Then I saw that the 1st exhaust pipe was cold. So I am running on 3 cylinders. I haven't checked the spark plug but I guess the small bang means that is not the problem? Anybody experienced anything like it? A friend said it might be a valve that blew. I wasn't revving at all when it happened.
fred2010-06-04 04:27:07 +0000 #2
Huh? a Big Bang? Now running on 3 cyls? and you haven't even bothered to pull a plug. This is too hard for you? Best take it to someone/shop who has a clue.
kelaog2010-06-04 04:31:06 +0000 #3
Quote:

Originally Posted by fred

Huh? a Big Bang? Now running on 3 cyls? and you haven't even bothered to pull a plug. This is too hard for you? Best take it to someone/shop who has a clue.

Don't talk down to the guy. His bikes broke and he's probably upset.

Start with the basics, see if maybe your ignitor just failed or something. You obviously have fuel if it's going bang bang bang out the tail pipe.

Anyhow the coil or spark plug cables leading to the plugs and put another spark plug in there and hold it to the engine and crank it, see if it sparks. IF not you're in luck. If it's sparking then you've got some dead cylinders on your hands.
Purplekawi2010-06-04 04:58:38 +0000 #4
Valves don't blow. They can break but if you broke one, it'd be sitting in your combustion chamber and your motor would most likely not move. Sounds like a coil or plug problem.
kelaog2010-06-04 06:10:13 +0000 #5
Quote:

Originally Posted by Purplekawi

Valves don't blow. They can break but if you broke one, it'd be sitting in your combustion chamber and your motor would most likely not move. Sounds like a coil or plug problem.

Yeah yeah!

Why do people think pulling spark plugs solves the mystery of the universe? lol. YES YES they change colors with heat and fuel mixtures... Crazy shit being that heat and fuel mixtures change too.... oooooo! Whose reading who?
Purplekawi2010-06-04 05:09:15 +0000 #6
Quote:

Originally Posted by kelaog

Yeah yeah!

Why do people think pulling spark plugs solves the mystery of the universe?

Because spark plugs can have the porcelain crack thus causing the plug to arc to the head thus loosing spark. Spark plugs can also have the gap close due to a large back fire thus causing no spark. Spark plugs can also have an electrode melt thus causing no spark.
kivyee2010-06-04 05:37:43 +0000 #7
Also when you pull the plug and find pieces of valve in the cylinder, you would read that as blowing the valve! Sounds like you've lost spark in a cylinder. Pull the plug .
Booger2010-06-04 06:33:46 +0000 #8
That sounds eerily similar to what happened to my car several years ago. Pretty much to a T.

I had to get a "valve job" on it.

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