Question about 2000 Harley Davidson FLSTF Fat boy

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Back cylinder sucking air at exhaust pipe - 2000 Harley Davidson FLSTF Fat boy

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  • Harley Davidson Master
  • 43,050 Answers

Hi Pat. replace exhaust gasket. Have nice day.

Posted on May 21, 2015

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Posted on Jan 02, 2017

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wayneman01
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SOURCE: There is very little exhaust residue in the left

It could be. However, (because you mentioned the backfiring) I would first make sure there is a nice, healthy spark to that cylinder. Also make sure the spark plug cap is not cracked. Look closely at the cap for any signs of 'carbon tracking'. These look like pencil lines drawn down the inside of the cap. This is evidence that the high voltage is traveling from the cap, to the engine - bypassing the spark plug. Any signs of carbon tracking means the cap must be replaced.

If the above checks okay, try a new set of spark plugs.

Finally, check the engine's compression. This will tell you if you've got a mechanical issue causing the problem. With the throttle held wide open and after a few revolutions of the engine, you need to see about 140 to 180 psi of compression on each cylinder. Anything less than 140 psi on a either cylinder - or more than about a 20% difference between the cylinders indicates a problem.

If the compression is low, the most likely causes are valves sticking in the valve guides - usually from excess carbon buildup, or worn / leaking valve seats.

Posted on Apr 02, 2010

  • 8909 Answers

SOURCE: The exhaust pipe at the

I have an XLCH1000 that had the same problem. I fitted finned exhaust clamps at the cylinder end and that cooled it down.
Ride safe and loud pipes save lives.

Posted on Dec 15, 2010

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I need to remove the exhaust manifold on the right side of a 94 4.9l engine in a cadillac deville. It has a broken bolt in the exhaust. What is involved in removing the manifold?


I suggest you use all new exhaust manifold hardware and torque new bolts to 20 Ft Lbs.
4.5L and 4.9L Engines
RIGHT
Disconnect the negative battery cable. Remove the air cleaner. Remove the exhaust crossover pipe. Disconnect the oxygen and coolant temperature sensors. Remove the catalytic converter-to-AIR pipe clip bolt. Remove the upper manifold-to-cylinder head bolts. Raise and safely support the vehicle. Disconnect the converter air pipe bracket from the stud and remove the converter-to-manifold exhaust pipe. Support the engine cradle with screw jacks and remove the rear cradle bolts. Loosen the front cradle bolts and slightly lower the Engine cradle. Remove the remaining exhaust manifold-to-cylinder head bolts, the AIR pipe, and the manifold. Clean the gasket mounting surfaces.
To install:
Install the exhaust manifold and replace the AIR pipe. Tighten the manifold mounting bolts to 16-18 ft. lbs. (21-24 Nm). Install the manifold-to-converter exhaust pipe and replace the converter air pipe bracket to the stud. Raise the Engine cradle and install the rear cradle bolts. Tighten to 75 ft. lbs. (102 Nm). Lower the vehicle. Replace the upper manifold-to-cylinder head bolts. Replace the converter air pipe to AIR pipe clip bolt. Connect the coolant temperature and oxygen sensor connectors. Replace the exhaust crossover pipe. Replace the air cleaner and connect the negative battery cable. Start the Engine and check for leaks.

Mar 28, 2017 | Cadillac Cars & Trucks

1 Answer

Gust refitted motor on 96 accent started up now have a whistle sound and revs8oo between 800 & 1200 revssounds like sucking air had been overheated got head recon


People pay a lot of money to get a whistling sound like a turbo. :>)

Check that the air filter has been fitted back.

If that checks out, check the exhaust manifold to cylinder head gasket is sealing properly and also the manifold to exhaust pipe joint.

Nov 18, 2016 | Cars & Trucks

1 Answer

Having a promblem taking off crossover exhaust pipe on a 2005 Buick rendezvous I tooken off the two front exhaust Then took bottom two bolt . But still fasten to something is there other bolts...


Thermostat? engine cooling?
2 engines, here, LYA adn LY7.
nobody here posts engine, why do that?
so ill post only for 1.
the LA1
here are the steps.
NO FSM Sux huh? nor an alldata.com account, why not that? 15 bucks?


STAT out.
Remove the air cleaner and duct assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls - 3.4L.

Drain the coolant until the coolant level is below the thermostat. Refer to Cooling System Draining and Filling (Refer To List 1) .

Remove the crossover exhaust pipe. Refer to Exhaust Crossover Pipe Replacement (Refer To List 2) in Engine Exhaust.

Remove the radiator hose from the thermostat housing.

Remove the thermostat housing bolts and clean any sealer from the bolt threads.

Remove the thermostat housing and gasket.
remove STAT
next is crossover page.

Disconnect the battery ground (negative) cable. Refer to Battery Negative Cable Disconnection and Connection (Refer To List 1) in Engine Electrical.

Remove the throttle body air inlet duct.

Drain the coolant from the cooling system. Refer to Cooling System Draining and Filling (Refer To List 2) in Engine Cooling.

Remove the inlet radiator hose from the engine. Refer to Radiator Inlet Hose Replacement (Refer To List 3) in Engine Cooling.

Remove the thermostat bypass pipe. Refer to Thermostat Bypass Pipes Replacement in Engine Cooling.



Remove the exhaust crossover heat shield bolts.

Remove the exhaust crossover heat shield.
  1. Remove the exhaust crossover pipe studs/nuts.
  2. Remove the exhaust crossover pipe.

end , remove.

now the bypass pipe FWD cars SUCK
  1. Disconnect the left engine mount strut from the engine.
  2. Remove the heater hose from the bypass pipe.
  3. Remove the thermostat bypass pipe to throttle body nut.
  4. Use the J 38185 in order to remove the thermostat bypass pipe hose clamps (1,5).
  5. Remove the thermostat bypass pipe to cylinder head nut (3).
  6. Remove the thermostat bypass pipe bolt (4).
  7. Remove the thermostat bypass pipe hose.
  8. Remove the thermostat bypass pipe.
sigh.....
why not log in to alldata.com
read the page then ask ques tons that are not clear.
and next time post the engine type.
above is just 1 engine.

Jun 18, 2014 | Cars & Trucks

1 Answer

Stuck valve


It is not unusual for the left side exhaust to be hotter. It hooks to the rear cylinder that has the least air flow and consistently runs hotter.
If the back pressure draws a dollar bill in when placed at the end of the pipe, this is typically caused by improperly closing valves.

Oct 19, 2013 | 1993 Suzuki VS 1400 Intruder

1 Answer

I have a Yamaha dragstar xvs 1100cc year 2002 as seen in Vidio , it has straight through slash pipes on it , I've had bike 2 months and now it's backfiring loads more on decel , I'm told to change the


Backfiring on throttle-closed decelleration is usually caused by cold air being sucked into a hot exhaust systen. Check for poor seal where the downpipe meets the cylinder head, and leakage at any joints beneath the engine if it has a balance pipe. Hope that helps.

Oct 10, 2012 | Cars & Trucks

1 Answer

Backfiring and popping on deceleration on a 2005 FLSTC, after installation of Vance & Hines longshot HS exhaust, & Big ****** air kit. The bike has sequential port f/i and was remapped with a...


Aftermarket pipes tend to lower back pressure, this will cause the fuel/air mix to lean out and result in the "popping" you hear---Backfiring, is extremely rare these days with electronic ignitions and the high reliability of engines. Real backfiring means the engine is not properly timed and the fuel/air mix is getting a spark and ignition at the wrong time (when the intake valve is open). Real backfiring is actually the bike "spitting up" in a sense, backwards through the carburetor or intake.You can check for exhaust leaks up around the cylinder heads by putting on some gloves and covering the exhaust tips momentarily. I have seen exhaust leaks that will make the popping worse by allowing air to be sucked in during deceleration...Hope this helps.

Jul 03, 2011 | Harley Davidson FLSTC - FLSTCI Heritage...

1 Answer

Bike runs but back fires through exhaust and intake. rear exhaust pipe is turning blued, while front is fine


You didn't say what year or model bike it is but I would guess, and that's all this is, that the rear cylinder is running lean for some reason. You may have an intake vacuum leak sucking air into the rear cylinder. That's my best guess.

Good Luck
Steve

Jun 02, 2011 | Harley Davidson XLH 1000 Sportster...

1 Answer

I have a 1967 Harley XLH Sportster. I rebuilt the


"Backfiring" is a pretty broad term depending on where you live. Some people refer to backfiring as popping from the exhaust while others refer to it as the engine spitting through the carburetor.

I'll assume that you're talking about popping out the exhaust pipe. If it does this after you rev the engine and it backfires on the way back down to idle, this is typical of an exhaust system sucking air. The mixture is extremely rich under these circumstances and will not ignite. But, if your exhaust system is sucking air, it combines with the fuel air mixture already there and bring it to an explosive mixture thus the backfire.

You can check you valves but I've always found that if the valves on an Ironhead are too tight, it's extremely difficult to get it started due to the low compression on that cylinder.

Check you ignition timing and points setting. Also, what kind of condition is your mechanical advance in the distributor in? I'm assuming this is an XLH model and not the magneto equipped XLCH.

What type of carburetor is on the engine? Hopefully not the original Tillotson that it came with. If it's an S&S, the low jet should be a 28 and the main jet a 66 to 70.

Jun 10, 2010 | 1979 Harley Davidson XLH 1000 Sportster

1 Answer

Backfiring when throttling back or on over-run downhill


hi,this is quite common on big v-twins,it is normally caused by a leak in the exhaust system(gaskets or clamps)this allows air to enter the exhaust system which then leans out the mixture inside the pipe,when the next hot exhaust pulse arrives from the cylinder,the lean mixture inside the pipe is ignited causing a backfire,check all the exhaust joints and the manifolds,where the pipe exits the cylinder,and make sure they are all tight and leak free,your problem should then go away,but in saying that,you will always get some exhaust popping on most v-twins,hope this helps

Feb 02, 2010 | 2005 Hyosung GT 650

1 Answer

1996 royal star, left rear valve seems to be sticking or something, getting rough idle with lots of backfire popping from that pipe, and motor is missing badly during takeoff and downshift idling. anybody...


The The Air Injection System AIS for that cylinder could be leaking (chrome pipe running up to a fitting right by the exhaust pipe) or more likely the rubber pipe that goes from the engine intake to carburetor is either loose at the engine or carburetor, or the rubber pipe is cracked, split or broken. This would cause air to be sucked into the crack, split or loose fitting during during acceleration or downshifting.

Aug 27, 2009 | 1996 Yamaha Royal Star XVZ 1300 A

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