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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 07-09-2009, 03:54 PM   #1 (permalink)
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Question Can bad gas cause hestitation, sputtering, backfires?

So I ran the bike down to reserve and filled it up with regular unleaded as I usually do. Well almost instantaneous, within the next few miles, I get hesitation, mild sputtering and poppy sounding backfires when decelerating. This has continued through 100 miles of riding.

Does this sound like bad gas or perhaps something clogging one of the carbs? Ive read several threads where adjusting the richness solves the decelerating backfire problem, but the way this occurred almost instantaneously has be thinking somethings clogging the carbs somewhere. Any ideas?
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Old 07-09-2009, 04:15 PM   #2 (permalink)
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Backfiring from bad gas

When I have bad gas, I backfire all the time...

Sorry, but I had to.
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Old 07-09-2009, 07:10 PM   #3 (permalink)
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Could be some crap in the tank or a blocked fuel filter. Or it could it was raining and the coil got wet or worst case it could be the pick up or ignition coil going like they both just did on my Thruxton.
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Old 07-09-2009, 08:25 PM   #4 (permalink)
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Sounds like mebbe a little foreign material in fuel.

Fill up with a good premium fuel, add some fuel

system cleaner, and hope for th best. I'm a big

believer in trying the cheapest, easiest fix first.

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Old 07-10-2009, 05:03 AM   #5 (permalink)
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also, "bad" gas may just wear on the engine over time, so IF your motorbicycle is old(er), it could be the gas. or if you normally use a higher rated fuel and drop down to junk, your riding tendencies with lesser quality fuel may be making you more aware of the setbacks your experiencing.

just a little optimism =) you prolly dont need a huge overhaul.
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Old 07-10-2009, 01:31 PM   #6 (permalink)
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Originally Posted by Nickwiz View Post
Could be some crap in the tank or a blocked fuel filter. Or it could it was raining and the coil got wet or worst case it could be the pick up or ignition coil going like they both just did on my Thruxton.
Not to hijack the thread, but what exactly was the sequence of symtoms when your pickup and coil went south?
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Old 07-10-2009, 03:22 PM   #7 (permalink)
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Firstly the odd stutter. Then a more pronounced misfire. Finaly the engine would cut when warm. No spark at all on either cyclinder. This resulted in me replacing the pickup coil. All was well for a few miles then the bike began to misfire on one pot. Swapped plugs put new HT leads caps on. Cheap as I had a load of HT lead and spare caps in the garage already for my old Brit bikes. With new leads caps and plugs I swapped the ignition coil out of Mrs Nickwiz Bonnie. Hey presto everything working fine. Put mine back in and misfire on one cylinder. I was unlucky both parts failing in quick succession.
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Old 07-10-2009, 03:33 PM   #8 (permalink)
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vac leak

If you have removed the AI system, check to be sure that one of the vacuum caps did not pop off. A vacuum leak could cause symptoms similar to what you have.
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Old 07-10-2009, 07:55 PM   #9 (permalink)
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Quote:
Originally Posted by ToeCutter66 View Post
If you have removed the AI system, check to be sure that one of the vacuum caps did not pop off. A vacuum leak could cause symptoms similar to what you have.

Yeah the Ai is removed, Ill check that thanks. Ive currently filled up with premium and a half bottle of fuel additive so we'll see how it goes. I'm going to try the cheap way before taking to the shop. Its also now doing "carburetor backfires" occasionally as well.
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Old 07-12-2009, 05:35 PM   #10 (permalink)
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Any recent mods other than AI elimination? Airbox or mufflers? Change jets or any screw settings?

You added fuel system cleaner and not sports drink like the knucklehead on another forum, right?

You filled the tank with gas and not diesel? I've seen it happen.

Know it sounds stupid, but check your battery cable connections especially the ground; both ends of the cables.

Hopefully it's something simple or overlooked.

Let us know how it turns out.

Good luck,

Jim
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