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Old 04-27-2013, 07:37 PM
squidbilly squidbilly is offline
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Super Z Running Bad after Techron

Hello All. First off some specs:
2009 Super Z with 31HP Kawasaki (FX850V-AS00-R) - 322 hrs on it.

It was running great up until my brother-in-law added Techron to both fuel tanks .... he said that he added 10 oz to 5 gallons of gas (per side). Almost immediately the mower started running rough ...... spitting and sputtering and backfiring. It would not run at all without the choke at least partially on. So, I siphoned the gas out of both tanks and added fresh straight gas. The problem persisted.

So, I took both tanks off, cleaned them thoroughly (they did have bad looking gas in the very bottom), replaced all the fuel lines, and changed to a larger Wix fuel filter. Now, it certainly runs better than it did (it will crank and run without choke). However, it will lose power and almost die (and backfire) when both sticks are pushed all the way forward at full throttle (but it does eventually pick back up). It just doesn't have the power it did.

It also seems like it sounds different even at idle without any load. The muffler is pop'n a little or something ... it is rather hard to describe. I also noticed that the fuel filter will not fill up. It is a larger filter than stock, but I guess I thought it should have more gas in it. I don't have to choke it or anything, but it just doesn't seem to run right or have the power it did.

Anyway, thanks for any suggestions.

Last edited by squidbilly; 04-27-2013 at 07:45 PM.
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Old 04-27-2013, 10:37 PM
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weeze weeze is offline
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techron will not hurt anything. it probably cleaned out a bunch of crap you had in there so it's getting it all out. it will eventually clear up i would imagine when all the crud is gone.
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Old 04-27-2013, 10:40 PM
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Restrorob Restrorob is offline
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First...... You need to tell your brother-in-law to stay the he11 away from your equipment with his snake oil magic potion crap !!!


Sounds like that crap nicely cleaned carbon off the pistons-valves and heads and conveniently deposited it under the valve seats so the valves can't seat properly, A cylinder leak-down test will verify this or eliminate it as the issue.

That's where I'd start......


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techron will not hurt anything.

Ahhh...... It's hurting right now with a flubbed up engine.......
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Old 04-27-2013, 11:14 PM
squidbilly squidbilly is offline
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Yeah, I wanted to get mad at him, but he felt so bad about it that I hated to get on him too hard. He meant well, but that won't help me cut grass.

How do I perform that sort of test?
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Old 04-27-2013, 11:18 PM
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Restrorob Restrorob is offline
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You need a leak-down tester and knowledge of using it, Check with your local repair shops and see if they have one to perform the test......
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"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
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Old 04-27-2013, 11:20 PM
squidbilly squidbilly is offline
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Originally Posted by Restrorob View Post
You need a leak-down tester and knowledge of using it, Check with your local repair shops and see if they have one to perform the test......

Thanks. So, leave the carb alone for now until after other testing? Also, should I be concerned that the fuel filter doesn't have more gas in it?
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Old 04-27-2013, 11:36 PM
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Restrorob Restrorob is offline
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Don't worry with the carb or about the fuel filter, Most filters won't show being full.

Pop'n out the muffler is a sign of ill seating valves.....
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"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
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Old 04-27-2013, 11:58 PM
squidbilly squidbilly is offline
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Gotcha. I guess I will have to find a leak down tester.
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