Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[ride for life]

I have a 2007 Screaming Eagle Springer.  I bought it used from a gentelman that owned a performance motorcycle shop.  It ran great when i bought it with about 105hp.  Today it has 60hp.  If I try and accelerate quickly the bike looses even more power, so I have to accelerate slowly.   The only thing that i changed during that time was i added an air filter since he had only a velocity stack on it.  Forget about passing at highway speeds.  The velocity stack looked cool but i like to ride and it was just not practical.  I have not been able to figure out the cause of the lose of power.  I have had three shops look at it so far and none of them has had any idea what the problem is.  One shop said ride it until it breaks completely and then they will know where the problem is and another suggested taking the engine apart to see if they can find something.  The bike was exactly what I wanted so I am keeping it. I am leaning toward having them disassemble the engine since I would like the power back and I don't want it to break and leave me stranded when out on a ride.   So what has already been checked.  The powercommander has been checked by replacing it two times with a race tunner and no improvements, the compression and fuel pressure are within range.  I am starting to think maybe i bent a lifter but it is all a guess at this point.  Anyone hear of this before and remember what caused it?

[clubbie]

Is it throwing any codes?

Have you run it on a dyno to check afr's?

[AXIL]

  If your ecm and fuel pressure have checked out ok the thing i would look at next is remove the plug under the
cam area and see how much oil comes out. should be no more than about 8 oz. Be careful reinstalling the plug,
it's at a slight angle and you can crack the case. I would check the fuel pressure again, it must be 55-62 psi at
all rpm's and not leak down more than five pounds when turned off. If not, there's your problem. good luck.
 
                                                                                                                 axil

[ride for life]

I have put the bike on the dyno and the air fuel ratio is properly mapped.  This was done at a harley shop.  The harley shop also checked to see is it was hydro-locking by pulling the plug and it was at 6 units of oil coming out which is where it should be.   

[ride for life]

The fuel pressure stays at 59 psi.  Factory spec is 60 psi so that does not seem to be the problem. 

[twinotter]

 You may have a bent pushrod, can't bend a lifter! Two things come to mind, neither good. First a scored piston(s) could be partially siezing due to lack of oil. Second, thegas your using may be causing detonation, making the timing pull back as much as 30 degrees trying to protect itself.
Check the oil pressure with a quality gauge, hot it must be about 12 at idle and 32-38 at 2500rpm.  Drain the fuel tank ,check for leaks in the fuel lines internally, they have been a real issue in the past with FI bikes. Use at elast 91 octane fuel, try different sellers, some fuel is better than others (less alcohol). Just my thoughts.
If these all check out, stop riding it, get it tore down for a look.  JM2C  twinotter

[dlaws01]

I know that you have probably already done it but I would also change out my fuel filter.  A dirty or partially clogged filter would cause this same response.

[2k]

Any bent internal parts would be making a racket!!! How does it sound??

[ride for life]

The bike sounds good, you can not hear and banging.  I have tried various fuels and even octane boosters.  The shop (since they are doing all the work at this point) have covered most of these comments already.  But confirming they are good ideas helps ease the pain of the bill that is adding up.


The next step is looking at the cam and timing.  No guarantees but since it could be the problem area mights well check it next.  Based on easy of the work and likely hood that that is where the problem is. 

[steve-o]

I'm assuming you have checked out the air filter. Possibly restricting air intake. Just my first thought since you changed from the one the bike came with. Just a thought !!!!!!

[cahdbiker]

ride for life, I would tend to go along with dlawsO1 regarding a fuel delivery problem. This is apples and oranges, but I had that same problem with one of my cars and after extensive testing of the computer and fuel position sensor etc. It turned out to be a clogged fuel filter. I would look for the simple cure first before tearing into the engine especially after the testing you have done and since it makes no noise. Check out all the fuel lines to make sure you have no blockage. Does it start okay and idle properly?. Also this is going out on a limb, and maybe I am off base, but if your battery is weak you could have problems when putting a load on the electrical system. I hope someone here can help you before you spend a lot of money. Better to be a mechanic than a parts replacer. Good Luck CAHDBIKER

[ride for life]

I originally thought it was a fuel problem, so it has been tested by two separate shops.  There is no fuel filter on my bike just a screen in the tank.  The fuel lines have been tested for leaks and fuel pressure including the lines inside the tank.  This also included trying octane booster in the gas.  It seemed like it had to be a fuel problem but after checking it twice I moved on from that idea.

I have not considered the battery but I like that idea and will test it. 

[2timen]

Yes you have a fuel filter. It's in the tank with the fuel pump and needs to change at 50k intervals. I had a simular problem with a built 95 incher. I finally found that it was the throttle body getting to oil from the breather off the heads. This would coat the sinser in the top of the throttle body not letting it read the proper fuel/air. Try cleaning it out with carb cleaner, make sure you clean out the msall port in the top where the sinser is. This worked for me. I later had to chnage my breather tubes to a different set uo so that they no longer vented into the throttle body. I don't know if that will help you, but it sure worked for me. And it will not cost chit to try it.

[ride for life]

The Harley shop stuck a different tank on my bike and says it ran without any problems.  Guess they had not ruled out a fuel problem like I had. 

So they had to order the parts but they are replacing fuel pump and filter (yes you were all correct my bike does have one) and the tubing and clamps.  They feel it is the pump but said mights well replace it all while they are all ready there.  I agreed and hope this does get it back to running like it used to.  Seems so obvious but why did it pass the other tests I am not sure.  I'm glad they had another tank to try this with and hopeful replacing these parts fixes the problem. 

I will post how it runs after I get it back. 

[Pete7539]

Not sure, but wasn't there some kind of recall or something with 07-08 regarding fuel pump losing pressure. I remember having mine changed out at no charge. Maybe the MOCO will foot the bill? Worth checking into.