Carburated 88CI sputtering

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Jun 11, 2017 | 08:42 PM

JerryCanada

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Carburated 88CI sputtering

Hey guys,

I own a 2004 Fatboy with the 88ci carb with about 26k km (16k miles). Went on a day trip yesterday and when I first started it notice idle was off and it sputtered intermittently. Never stalled and was cold so didn't make much of it and left. On the highway it drove normally. Later in the day got to a few intersections and it start doing that sputtering again when putting load on engine. Coming back on highway when going up some steep hills it would miss a heartbeat every now and then.

I will put new plugs in tomorrow even though they both looked fine just for piece of mind but would anyone have an idea as of what could be the cause of this?

Thanks,

JerryCanada

Jun 12, 2017 | 04:31 AM

Hillsidecycle.com

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I'd start by insuring the air/idle misture screw is out 2 1/2-3 turns, and bet that either the use of a 48, or 50 pilot jet is what you'd want.
Shy of that, insure you have proper petcock fuel delivery.
Scott

Jun 12, 2017 | 06:37 AM

JerryCanada

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Thanks for the reply Scott. I've owned the bike for 3 years and it just started to do this. Would the mixture setting be something that would need attention every now and then?

Jun 12, 2017 | 07:09 AM

Hillsidecycle.com

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Not unless the engine is starting to show signs of becoming weak, or your current brand of fuel has changed dramatically.
Perhaps an inspection of the vacuum piston assembly, as well, would be in order.
Scott

Jun 13, 2017 | 01:26 PM

SafetyFifth

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X2 on checking that CV diaphragm for tears. I'd also check your intake seals.

Jun 15, 2017 | 08:03 AM

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Yep.
Scott

Jun 17, 2017 | 08:56 AM

JerryCanada

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After changing plugs and switching gas I took it out and it ended up only running on the front cylinder. No fire at the back one. Took seat off and noticed the plug for the module on rear fender has somehow managed to come loose so pushed it all the way in and has been working like new since. Thanks for all the replies!