Question about Harley Davidson FLSTF - FLSTFI Fat Boy Motorcycles

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Is the valve tappet adjustment on a 1999 Fat Boy the same as it would be on a 1975 sportster? Meaning, are the pushrods adjusted to be free turning at the lowest point on the lobe?

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Posted on May 09, 2010

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Valve adjustment proceedure


Hi Heidi, for more information about your question please visit the websites below. Good luck and have nice day.
2006 Harley Davidson Road King tappet and pushrod replacement

Aug 23, 2012 | 2003 Harley Davidson FLSTF Fat boy

2 Answers

I have a 2000 Road King 88 inch Twin Cam. It has T-7011 V-Thunder adjustable pushrods. I am putting in new stock Harley lifters. How do I adjust the pushrods. How many turns from zero lash?


Stock lifters often allow valve noise. Consider velvet touch or Jims' lifters AND lifter blocks. Adjustable push rods are okay.
Adjustment: I prefer TOTALLY dry lifters get the lifter at its lowest point and FULLY collapse the lifter. then turn looser by 1 to 2 1/2 turns. What this does is allow for a loss of oil pressure without engine destruction. This procedure is essentially the opposite of the normal procedure.
Many HDs have intermittent valve tapping and we have traced to the lifters. HD says "It's a Harley", but a valve tap ruins the whole ride.

Jun 10, 2011 | Harley Davidson FLHR-FLHRI Road king...

1 Answer

Valve adjustment


To adjust the valves on your Ironhead, the engine must be stone cold. You want to adjust the tappets so that you have zero backlash on the cold engine. As the engine heats up, the cylinder and heads expand upward creating valve lash in the valve train. This is why you want zero lash with the engine cold. If you get the valves set too tightly, it'll hold a valve open ever so slightly and make starting difficult.

To adjust the valves, bring one piston to TDC on the compression stroke, both valves closed with tappets in their lowest position. Pop the pushrod covers loose and loosen the lock nut on one of the tappets. Adjust the top part of the adjuster outwards until the pushrod can no longer be turned with your fingers. Turn the lock nut down but don't lock it yet. Gradually turn the top adjuster downward until you can spin the pushrod with your finger and finish locking the lock nut. Recheck the pushrod to see if it still spins but has no up and down movement. Do the same with the other pushrod on that cylinder. Remember, if's better to get the pushrods adjusted slightly loose rather than slightly tight. It might rattle a bit more but it'll start easier as well. Put the pushrod tubes back together and then do the same thing with the other cylinder.

May 21, 2011 | 1979 Harley Davidson XLH 1000 Sportster

1 Answer

How do i adjust my rockers on the rear jug took apart 2 fix base gaskets on rear jug


If your bike is equipped with the Evolution engine there is no adjustment on the rocker arms, the engine is equipped with hydraulic tappets. The pushrods on the Big Twin Evo engine are color coded and go in a particular position. They are different lengths. The blue color coded pushrod is the rear intake pushrod, the purple color coded pushrod is the exhaust pushrod. The pushrods for the Evo Sportster are all the same and there is no adjustment on those eiher provided they are stock.

Now, if you are working on something other than an Evolution engine or you have aftermarket pushrods, please repost and I'll tell you what I know about the valve adjustment for your engine.

Steve

Mar 26, 2011 | Harley Davidson FXST - FXSTI Softail...

1 Answer

Trying to find correct method to set or adjust tappets on my 1973 Harley-Davidson Shovelhead engine which has a stroker motor and solid lifters


If your Shovelhead has solid lifters, you set them exactly like you would set the tappets on an Ironhead Sportster. With the engine stone cold, Bring either piston to top dead center ON THE COMPRESSION stroke. Both valves on that cylinder should be closed and the tappets on the heel of the cam at this point. Now, adjust the pushrods longer until you can no longer turn them with your fingertips. Now, back them back down until you can barely spin them with your fingers. Lock the locknuts down. Then bring the other cylinder to TDC COMPRESSION STROKE and adjust those pushrods.

You are adjusting for Zero backlash just like on an Ironhead Sporty. As the engine heats and the cylinders and head expand, they do so away from the cases which gives you more backlash the hotter they get. If you get the pushrods too tight, when the engine cools down, they'll hold the valve open just slightly making the engine difficult to get started.

Now, if you have hydraulic tappets, with the engine cold, back the pushrods off until they are loose. Bring them back down to zero backlash and then come down four additional turns and lock the locknut. Wait until the tappet bleeds down and you can spin the pushrod before you turn the engine.

Good Luck
Steve

Mar 20, 2011 | Harley Davidson FLHT Electra Glide...

1 Answer

How to adjust valves on 97 harley fatboy motor has a tick or peck in the back cyl. is there an adjustment for the valves? this cont after the motor warms up.


There is no adjustment on the tappets in your 97 Fat Boy. It is equipped with hydraulic tappets similar to an automotive engine. Probably what you are hearing is a bit of wear in the rocker shaft. you can take your rocker arms out and have new bushings and shafts installed if it bothers you that much. If the tick is a loud tick, one where people turn around and look at your bike when you start it up, you may have a bad roller on a tappet. This makes a terrible noise. If this is the case, you are probably going to need a new camshaft as well and the locked up roller will gall the surface of the cam. I've seen these rollers go bad at any mileage from 13K to 70K.

Good Luck
Steve

Jan 24, 2011 | 1993 Harley Davidson FLSTF Fat boy

1 Answer

Its hard to start and when running its poping in the front cylinder


The Ironhead Sportsters have solid lifter in them and they must be adjusted correctly. To adjust the valves, remove the spark plugs and get the rear wheel off the ground. Shift the transmission into fourth gear and use the rear wheel to turn the engine over. Remove the push rod cover clips and collapse the push rod tubes.

Now, bring the front piston to top dead center on the compressin stroke. Use a common drinking straw inserted into the spark plug hole to tell where the piston is in the cylinder. Do not use anything else as if you use something that will break, it may do so and the then you'll have to pull the head to get it out of the cylinder. If you are on the compression stroke, the two tappets will be down. If one is up, you are not on the compression stroke.

Loosen the lock nut and adjust the adjuster upwards to make the tappet taller. Adjust it upwards just enough to make the pushrod tight to where you cannot turn it. Now, lower the adjuster until you can just spin the pushrod between your two fingers easily, Lock the lock nut and move to the next tappet on the front cylinder.

Now, do the same thing on the rear cylinder. It is better to have the pushrods just a bit loose rather than too tight. If the pushrod is tight, it will hold the valve open and make the bike hard to start. If you do get it started, it may pop on one or the other cylinder until the engine warms up and the cylinders expand. Make sure you have a good set of plugs in the engine as well.

When finished, shift the transmission back to neutral and lower the bike. Install the spark plugs.

Good Luck
steve

Aug 15, 2010 | 1979 Harley Davidson XLH 1000 Sportster

1 Answer

Looking for instructions to adjust valves on 1987 H.D.


If the engine is stock, there is no adjustment to the valves. The engine is equipped with hydraulic tappets that take up for any wear or heat expansion of the cylinders. The pushrods are non-adjustable but are of different lengths. They are color-coded as to what position they go in.

Now, if your engine has been modified and adjustable pushrods installed, they should work the same way unless they are way out of adjustment. Then, it depends on "whose" pushrods they are as not all pushrods have the same threaded ends on them. But, all is not lost.

Take one of the pushrods out of the engine and adjust the pushrod as short as it will go. Now, turn the end out until it makes the pushrod exactly 0.100" longer while counting the "flats" on the adjuster. When you install the pushrod, make sure the tappet is at it's lowest point in the bore. Put the pushrod in, don't forget the tube and the new O-rings, and adjust the pushrod out until you have zero backlash. Then adjust it out the additional number of "flats" that it took to make it exactly 0.100" longer. Lock the adjuster down. What you're doing here is the plunger of the tappet has a travel of 0.200" total and you're adjusting the pushrod so that the plunger is halfway in the middle of its travel so that it's got equal travel in both the up and down direction.

Good Luck

Jun 02, 2010 | 2003 Harley Davidson FLHTC Electra Glide...

1 Answer

Adjustment on 1000cc values 1983 harley davidson sportster


To adjust the valves on your Ironhead Sportster, first collapse all the pushrod tubes, remove the spark plugs, and get the rear wheel off the ground. Put the transmission in fourth gear. Now, use the rear wheel to turn the engine.

To adjust the valves, bring the front cylinder to Top Dead Center. Use a common plastic drinking straw down in the spark plug hole to make sure the piston is at Top Center. Make sure both tappets for the front cylinder are all the way down. Now, loosen the lock nut slightly and turn the adjuster to make the tappet longer. You want to make it just long enough so that you can't turn it with your fingers. Gradually back down on the tappet until you can turn the pushrod with your fingers. Lock the locknut down when done. Now do the other tappet.

Once you've done the front cylinder, turn the engine using the rear wheel until the rear piston comes to Top Center. Always turn the engine in the normal direction of rotation. Adjust the two tappet the same way as you did the front cylinder tappets.

When finished, put the transmission in neutral, lower the rear wheel, put the plugs back in, and close up the pushrod tubes.

These tappets set to Zero Backlash, none. Therefore this must be done on a completely cold engine. When the engine starts up and as it warms up, the cylinders and head "grow" due to the heat expansion properties of the metal. As they grow, you pick up valve lash and the valves will clatter a bit. This is where the old saying came from, "You can tell it's a Harley from a mile away by the way the engine sounds. You can tell it's an Ironhead from a half mile away from the valve clatter". If you get the valves too tight, when the weather cools down in the winter, you could wind up with a valve standing open just enough to make the bike impossible to start due to low starting compression. It's better to have the valves a bit loose and have them clatter than have them too tight making the engine difficult to start.

Good Luck,
Steve

Apr 24, 2010 | 1979 Harley Davidson XLH 1000 Sportster

2 Answers

I put drag pipes on,now crank position sensor


There is no adjustment to the valves on your Evo Sportster. The tappets are self adjusting hydraulics unless someone has changed them. Take a look at you pushrod tubes, are they should be one-piece tubes.

Sorry but I cannot explain why your crank sensor keeps giving trouble. I know nothing of the electronics on the newer bikes. But I do know that the last Sportster that used solid tappets was the 1985 model Ironhead. All Sportsters since have hydraulic tappets and require no adjusting.

Mar 03, 2010 | 2004 Harley Davidson XL 883 Sportster

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