2011 flhtk sputtering after cam, pushrod, header installed
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6th Gear
Joined: Nov 2017
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From: Temecula
2011 flhtk sputtering after cam, pushrod, header installed
Hi,
I have a 2011 harley ultra limited. I just installed 551 easy start cams from s&s, adjustable pushrods from s&s, cobra power port duals, cobra powerflo air cleaner and S&S 4 in grand national slip ons. The problem I'm having is it accelerates to about 3000 rpm then starts to pop and sputter to about 4000rpm. After 4000 rpm it pops super loud and accelerates to the 5500 and feels like it wants to rip me off the back of it.
I called vance and Hines because I am using a FP3 auto tuner and they suggested the map I'm currently running.
My question is does this sound like I screwed up mechanically or is it the tune? If it sounds like a tune issue would you recommend buying a different tuner (i.e. Power vision, fj, or dyno jet) or taking it to a place that dynos)? If it's mechanical, suggestions on a fix?
Im kinda on a tight budget because I just started a new job and haven't gotten paid yet.
I have a 2011 harley ultra limited. I just installed 551 easy start cams from s&s, adjustable pushrods from s&s, cobra power port duals, cobra powerflo air cleaner and S&S 4 in grand national slip ons. The problem I'm having is it accelerates to about 3000 rpm then starts to pop and sputter to about 4000rpm. After 4000 rpm it pops super loud and accelerates to the 5500 and feels like it wants to rip me off the back of it.
I called vance and Hines because I am using a FP3 auto tuner and they suggested the map I'm currently running.
My question is does this sound like I screwed up mechanically or is it the tune? If it sounds like a tune issue would you recommend buying a different tuner (i.e. Power vision, fj, or dyno jet) or taking it to a place that dynos)? If it's mechanical, suggestions on a fix?
Im kinda on a tight budget because I just started a new job and haven't gotten paid yet.
Supporter
Joined: Oct 2009
Posts: 2,056
Likes: 248
From: Milton Mills NH
How old are the plugs?
Did you double check your timing prior to putting it back together?
Is the fuel filter new or has some age on it?
Plug wires good?
Check these out before buying a tuner.
Did you double check your timing prior to putting it back together?
Is the fuel filter new or has some age on it?
Plug wires good?
Check these out before buying a tuner.
Road Master
Joined: Jun 2010
Posts: 1,159
Likes: 120
From: pontotoc ms
Dont know if this would have anything to do with it,but you put easystart cams in a bike with compression releases built in.
if you use easystart cams do you not have to cut them off on the bike
if you use easystart cams do you not have to cut them off on the bike
Stellar HDF Member
Joined: Jun 2007
Posts: 2,928
Likes: 117
From: Ashby, Ma
How does it feel from 2Krpm to 3Krpm, is it smooth power? How does it start, idle and accelerate from a dead stop? At 4K it back fires and then accelerates strong?
One thing I've read from Fuel Moto is that they have experienced significant issues tuning these builds with the big 4 inch mufflers. They apparently don't present much backpressure to the engine and makes tuning difficult. Having said that, one thing to check and confirm is that you have the oxygen sensors connected correctly and not having those connections reversed. Using the stock 12mm sensors?
It sounds like a pretty powerful build and Auto-tune can only do so much with narrow band sensors which translates to mean the base map needs to fairly close as a starting point. If the bike accelerates pretty well up to 3K, and idles/runs well at the lower rpm and also the upper rpm, and is just not right on that middles 3K to 4K range, it sounds like that tune just isn't right. If it was mechanical wouldn't also have a negative effect down n the lower area of the rpm range?
One thing I've read from Fuel Moto is that they have experienced significant issues tuning these builds with the big 4 inch mufflers. They apparently don't present much backpressure to the engine and makes tuning difficult. Having said that, one thing to check and confirm is that you have the oxygen sensors connected correctly and not having those connections reversed. Using the stock 12mm sensors?
It sounds like a pretty powerful build and Auto-tune can only do so much with narrow band sensors which translates to mean the base map needs to fairly close as a starting point. If the bike accelerates pretty well up to 3K, and idles/runs well at the lower rpm and also the upper rpm, and is just not right on that middles 3K to 4K range, it sounds like that tune just isn't right. If it was mechanical wouldn't also have a negative effect down n the lower area of the rpm range?
Thread Starter
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6th Gear
Joined: Nov 2017
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From: Temecula
Brand new spark plugs, replaced them at the same time as putting this new stuff on. Oxygen sensors are in the right holes. The bike accelerates fine up to the 3-4K range and only sputters at 4 and sometimes prevents me from further acceleration until 5 then it backfires and takes off.
As for timing I lined up the dots on the cams and on the gears when I did the chain to spec of manual and s&s directions. I've only auto tuned it on streets with traffic, no open roads or freeways. But even the map sent by v&h gave me the same sputter
As for timing I lined up the dots on the cams and on the gears when I did the chain to spec of manual and s&s directions. I've only auto tuned it on streets with traffic, no open roads or freeways. But even the map sent by v&h gave me the same sputter
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6th Gear
Joined: Nov 2017
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From: Temecula
I haven't checked or changed out the fuel pump or filter but after reading the comment above and looking over symptoms. It sounds feasible that it could be just that. I bought the bike a little over 2 years ago and it had 12k miles on it with the original tires and battery... so I'd be safe to assume the original rider didn't change the filter. I'm now at 30000 ish miles
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Elite HDF Member
Joined: Nov 2013
Posts: 4,377
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From: Santa Clarita
I haven't checked or changed out the fuel pump or filter but after reading the comment above and looking over symptoms. It sounds feasible that it could be just that. I bought the bike a little over 2 years ago and it had 12k miles on it with the original tires and battery... so I'd be safe to assume the original rider didn't change the filter. I'm now at 30000 ish miles
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Stellar HDF Member
Joined: Aug 2007
Posts: 2,052
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From: Virginia Beach
The 551 cam really isn't a 4k plus rpm cam. Thats when it dies. It makes all its power down low. I'd say you have a fuel problem, but the pipes, specifically the header, may not match the build. You should be able to tune it to get it close though. When I take something apart, and I put it back together and it doesn't work, I look at what I did first. Double check everything.
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