Question about Harley Davidson FLSTC Heritage Softail Classic Motorcycles

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Running lean I have a 2010 harley heritage. I put on vance and hines pipes true dually style with stock touring mufflers off of a road king. I drilled a 7/8" hole at the front plate. I drilled a7/16" hole at the back plate. The spark plugs had a nice tan color to them. To get more souund I drilled the back plate to a 1/2" hole. The plugs have a white color to them which tells me the bike is running lean. The bike seems to run fine. should I be worried about anything? If so, how can I fix it?

Posted by Anonymous on

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  • Harley Davidson Master
  • 41,814 Answers

Hi Anonymous, I dont think so. Did your MPG improve? As long as your engine oil temperature stays between 180 and 220 you will be fine. Good luck

Posted on May 13, 2015

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Posted on Jan 02, 2017

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v2iper
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SOURCE: what size spark plug for a 2000 harley davidson road king carbed,

Your Twin Cam plug should be a 6R 12 Harley Plug. Often times the back fire is just the nature of the beast depending on what type of pipes you are running. Harleys do run lean, its an EPA thing thtas why they choke them down from the factory. Since you have a carb you could have an intake leak around the Intake. Also Under the carb is an adjustment screw. Harley plugs it up so people don't play with it. You have to just drill out the plug this will set your air fuel. Whenever I take a carb off I drill out that plug. Heat your bike up operating temp and ear tune that screw. Only other way is with air fuel analizer or a dyno. good luck.also that backfire is caused by fuel hitting your exhaust when you let off just to let you know.

Posted on Jun 15, 2009

  • 269 Answers

SOURCE: put on vance and hines slips...did not rejet..

You MUST rejet the bike!!! When cold or warming up the bike should be running in a rich mode. After it warms up you are running lean. Cheaper to rejet than replace "hole in the top of pistons".
To help prevent more problems in the future, find who ever told you that rejetting was not required, turn them around, take your right foot and kick their @#$. This could save you lots of grief and $$ in the future.

JP

Posted on Nov 27, 2009

  • 269 Answers

SOURCE: 2009 1200 low harley..pipe turns red after 2 min of running

If you did not adjust your EFI (load a different MAP) then you are leaning the bike way out! This is very bad as the bike will often run at an AFR of 14.0+. do not run the bike until you get the fuel adjusted!! You will void the warranty!!!

Posted on Dec 16, 2009

wd4ity
  • 4565 Answers

SOURCE: need Vance Hines Big Shots Long mounting

Go to this site and contact their "technical support" division at this e-mail address.
http://www.vanceandhines.com/index.html

tech@vanceandhines.com

Good Luck
Steve

Posted on Nov 30, 2010

Mr BrokRench
  • 1623 Answers

SOURCE: My 97 fat boy seems

With aftermarket pipes they will almost always run on the lean side due to the reduction in back pressure...Retuning the carb is required. If you have an aftermarket air intake, this will also effect it.

Posted on Jul 21, 2011

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1 Answer

2003 harley davidson full dresser back fires or pops sound on the left side pipe when i let go the the gas handle at around 2000rpms it all started when i had new cams put in


Popping sound at the exhaust is usually due to a very lean setting which causes unburnt fuel to burn late in the exhaust pipe and happens when you are going at a high rpm with a closed throttle making it even leaner. My bike had the same problem and most Harleys are factory tuned lean which is very bad as the engine runs hot. After putting free flow Rhinehart pipes like i did, it became worst so i installed the Vance & Hines fuelpak and now my bike runs so silent and cooler. A great difference from before.

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Need to replace muffler on 2004 buell blast


If it is a stock muffler then buy another stock muffler and put it on - they are ALL the same. Buell never changed the exhaust on the blast at all. If it is aftermarket(vance and hines) than you need to measure the pipe and find something that fits.

Mar 03, 2013 | 2004 Buell Blast

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What is the oem part numebr for 2008 road king mufflers?


The 2005 mufflers are the same ones that came stock on your bike.

Jul 26, 2012 | 2000 Harley Davidson FLHR-FLHRI Road king

1 Answer

Back fire with vance hines pipes


Sounds like it is running lean. The ECM must be remapped for a performance breather and/or free flowing pipes. I would use H-D Super Tuner or have a dealer do a digital download to remap the ECM properly for the changes you have obviously made. You may do great harm to your engine if you run it without the mapping change as the VE will be changed and the ECM doe not know what is physically going on with VE if it is not mapped into the ECM

Mar 26, 2012 | 2001 Harley Davidson FLHRCI Road King...

1 Answer

My 97 fat boy seems to run lean and has a hesitation when the tap is opened. Works fine with the choke on. No induction leaks that I can find. Has stock carb, vance and hines 2-1 exhaust.


With aftermarket pipes they will almost always run on the lean side due to the reduction in back pressure...Retuning the carb is required. If you have an aftermarket air intake, this will also effect it.

Jul 21, 2011 | Harley Davidson FLSTF Fat boy Motorcycles

2 Answers

On my pipes one side is hot and the other is cold


Check the pipe right where they come out of the heads. It depends on what type of exhaust system you have on your Road King. If the stock exhaust is on the bike, the rear cylinder exhaust is directed to both mufflers. With the exhaust from the front and part of the exhaust from the rear cylinders going to the right side muffler, it gets more exhaust than the left side and runs hotter. Like I said, check the temp of the exhaust pipes at the cylinder heads. If one of them is cold, that cylinder is not firing. As long as both of the pipes are hot there, you're fine. Just ride the bike and have fun.

Ride Safe.
Stevev

Apr 09, 2011 | 2000 Harley Davidson FLHR-FLHRI Road king

2 Answers

MY 2001 ROADKING WITH CARB I INSTALLED 95 IN


Try and get the carbs balanced .You may have one in need of adjusting .

Mar 17, 2010 | 2001 Harley Davidson FLHR - FLHRCI Road...

2 Answers

Have a2008 fatboy put on a set of big radius when letting go of thrortle it pops what causes it to do that


decel pop is caused by a lot of things! if you have big pipes; ie:drag you need baffles to tune the exhaust wave; theoretically upon decel instead of exhausting you are actually allowing reversion- which allows exhaust to actually renter your engine and try to get compressed again; very bad for performance, etc big pipes are cool but need proper baffling and tunage to be useful; may be too lean possible fix w/ supertuner/ dyno runs; I like "lollipop" baffles you can make for under 5 bucks and tune as you need; thats what I run on my 95HP sporty; Have Rinehart true duals on my Road King and via ecm tuning you can really dial it in. F/I is great but you need to "pay to play" no quick fixes like in the carb days; really need a dyno or some sort of computer tuning capability; I recommend Super Tuner rather than the piggyback setups; more expensive at first but wont fry your ecm either. A good dealership will be able to tune it right the first time in under an hour...sorry for the lenghly reply but I see this question all the time...T

Jul 02, 2009 | Harley Davidson Harley-Davidson Motorcycle...

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