losing top end power

softail 88 · Oct 26th, 2009, 12:19 PM

i am a person that runs my bike hard.i have older fxstc with good hp. it has been back firing on top end if i dont get on it runs great once i try to race i lose power on top end just had the carb readjusted and cleaned and the bike tuned better ran great for a couple days then the problem started again could it be my coil hitting and missing like that i know for sure its not a fuel delivery prob just went over all that any help or thoughts would be great thanks

Hobbit · Oct 26th, 2009, 12:23 PM

electrics is were i would look next, also look at your clutch pack as it may be getting weak when hot

glider · Oct 26th, 2009, 12:24 PM

Did you replace plugs and wires?

softail 88 · Oct 26th, 2009, 12:46 PM

yeah i installed new high performance plugs and wires

glider · Oct 26th, 2009, 12:57 PM

Why/what performance plugs and what wires, no beating the stock parts on these bikes.

Did this start after replacing these parts?

Hobbit · Oct 26th, 2009, 01:00 PM

if you fitted performance wires and plugs did you use SE parts? to enusre the corect ion sensing

softail 88 · Oct 26th, 2009, 01:14 PM

this started before the plugs and wires both are SE from harley i have high performance ignition so i use H.P. plugs and wires

glider · Oct 26th, 2009, 01:15 PM

What ignition, is the engine stock?

Have you eliminated fuel problems or did this start soon after a fill up?

Hoople · Oct 26th, 2009, 01:24 PM

Quote:

Originally Posted by softail 88

it has been back firing on top end

Back firing on top end, like it was said, Electrics.

I know it is a crude way to test something but can you pull a thick orange spark with a "spark gap" with engine running. (test both sides)

softail 88 · Oct 26th, 2009, 01:38 PM

100% sure its not a fuel prob went over all that first.the engine is not all stock.the bottom end is the heads bored a little over.mid size cam.i have a twin fire 2 dc6-5 igintion.HOPPIE what do you mean pull the plug and see what color the arc is and what would that tell me

Oct 26th, 2009, 12:19 PM	#1
softail 88 Start The Engine Ride: 88 softail Join Date: Oct 26th, 2009 Posts: 26 My Mood:	losing top end power i am a person that runs my bike hard.i have older fxstc with good hp. it has been back firing on top end if i dont get on it runs great once i try to race i lose power on top end just had the carb readjusted and cleaned and the bike tuned better ran great for a couple days then the problem started again could it be my coil hitting and missing like that i know for sure its not a fuel delivery prob just went over all that any help or thoughts would be great thanks

Oct 26th, 2009, 12:23 PM	#2
Hobbit Moderators Ride: 2009 FAST 103 Street Bob Join Date: May 18th, 2007 Location: The Shires UK Posts: 7,625 My Mood:	Re: losing top end power electrics is were i would look next, also look at your clutch pack as it may be getting weak when hot __________________ Please stop by the "self help section" for maintenance tips, diagnostic codes and much more. >>Self Help Information and Tips<< click me!

Oct 26th, 2009, 12:24 PM	#3
glider Community Liaison Ride: 07 Road King Classic Join Date: Jun 21st, 2007 Posts: 20,470 My Mood:	Re: losing top end power Did you replace plugs and wires? __________________ Psssst! Please stop by the "self help section" for maintenance tips, diagnostic codes and much more. click me!>>Self Help Information and Tips<< click me!

Oct 26th, 2009, 12:46 PM	#4
softail 88 Start The Engine Ride: 88 softail Join Date: Oct 26th, 2009 Posts: 26 My Mood:	Re: losing top end power yeah i installed new high performance plugs and wires

Oct 26th, 2009, 12:57 PM	#5
glider Community Liaison Ride: 07 Road King Classic Join Date: Jun 21st, 2007 Posts: 20,470 My Mood:	Re: losing top end power Why/what performance plugs and what wires, no beating the stock parts on these bikes. Did this start after replacing these parts? __________________ Psssst! Please stop by the "self help section" for maintenance tips, diagnostic codes and much more. click me!>>Self Help Information and Tips<< click me!

Oct 26th, 2009, 01:00 PM	#6
Hobbit Moderators Ride: 2009 FAST 103 Street Bob Join Date: May 18th, 2007 Location: The Shires UK Posts: 7,625 My Mood:	Re: losing top end power if you fitted performance wires and plugs did you use SE parts? to enusre the corect ion sensing __________________ Please stop by the "self help section" for maintenance tips, diagnostic codes and much more. >>Self Help Information and Tips<< click me!

Oct 26th, 2009, 01:14 PM	#7
softail 88 Start The Engine Ride: 88 softail Join Date: Oct 26th, 2009 Posts: 26 My Mood:	Re: losing top end power this started before the plugs and wires both are SE from harley i have high performance ignition so i use H.P. plugs and wires

Oct 26th, 2009, 01:15 PM	#8
glider Community Liaison Ride: 07 Road King Classic Join Date: Jun 21st, 2007 Posts: 20,470 My Mood:	Re: losing top end power What ignition, is the engine stock? Have you eliminated fuel problems or did this start soon after a fill up? __________________ Psssst! Please stop by the "self help section" for maintenance tips, diagnostic codes and much more. click me!>>Self Help Information and Tips<< click me!

Oct 26th, 2009, 01:38 PM	#10
softail 88 Start The Engine Ride: 88 softail Join Date: Oct 26th, 2009 Posts: 26 My Mood:	Re: losing top end power 100% sure its not a fuel prob went over all that first.the engine is not all stock.the bottom end is the heads bored a little over.mid size cam.i have a twin fire 2 dc6-5 igintion.HOPPIE what do you mean pull the plug and see what color the arc is and what would that tell me

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losing top end power

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