F4i - Main Forum Main F4i discussion board

Spark Plug always fouling

  #1  
Old 07-12-2010, 03:16 AM
Junior Member
Thread Starter
Join Date: Jun 2010
Posts: 14
Default Spark Plug always fouling

Hi Guys,

I'm hoping someone here would be able to help me out.
My 2002 F4i sounds like a helicopter again for the 4th time now. I notice that after having a long ride (100+ km), this happens.
The good thing is, after changing the spark plugs, it goes back to it's smooth riding again. But I have changed the plugs so many times that it has become costly already. I have cleaned the injectors and done the throttle valve sync but the plugs keep on fouling up.

Do you have any idea how I can solve this permanently? Thanks in advance..
 
  #2  
Old 07-12-2010, 03:25 AM
Senior Member
Join Date: Sep 2009
Location: Lancaster TX
Posts: 246
Default

how is it fouling out
oil
gas
water
got a pic of one?
 
  #3  
Old 07-12-2010, 04:02 AM
Junior Member
Thread Starter
Join Date: Jun 2010
Posts: 14
Default

The plugs are burnt dark brown but not all 4 are equally discolored. 1 and 3 are more dark. It seems fuel is the more likely culprit but i dont know where it's coming from or how it does.
Sorry I dont have a pic yet, I might open it up on the weekend though..
 
  #4  
Old 07-12-2010, 04:18 AM
Senior Member
Join Date: Sep 2009
Location: Lancaster TX
Posts: 246
Default

dose it look like any of these?
http://www.gnttype.org/techarea/engine/plugs.html
 
  #5  
Old 07-12-2010, 04:48 AM
Junior Member
Thread Starter
Join Date: Jun 2010
Posts: 14
Default

it most likely looks like the illustration on Z-3 or the Carbon Fouling.. I sometimes encounter problem on cranking the engine. I figured it's a low battery charge but one moment its ok, the next its dead, then ok, then dead.
I rode the bike yesterday for around 60kms and i was able to rev it upto 8k RPM. I was thinking I could scare the carbon deposits away. I hope this was not a stupid thing i did... The bike had power but not comparable as before. today it's running, and still doesnt sound like a bike.
 
  #6  
Old 07-12-2010, 10:23 AM
July 2010 ROTM
Join Date: Oct 2009
Location: arkansas
Posts: 1,150
Default

have u checked your fpr yet?
 
  #7  
Old 07-12-2010, 08:27 PM
Junior Member
Thread Starter
Join Date: Jun 2010
Posts: 14
Default

sorry for my ignorance, what's fpr?
 
  #8  
Old 07-12-2010, 08:32 PM
KdubyaH's Avatar
June 2011 ROTM
Join Date: Jan 2009
Location: Cincinnati, OH
Posts: 509
Default

fuel pressure regulator. You can get one for $60 and have it changed out in 45 minutes tops. If you have a power commander it could have a map on it thats making your bike run really rich.
 
  #9  
Old 07-12-2010, 08:34 PM
KdubyaH's Avatar
June 2011 ROTM
Join Date: Jan 2009
Location: Cincinnati, OH
Posts: 509
Default

Originally Posted by mugball View Post
it most likely looks like the illustration on Z-3 or the Carbon Fouling.. I sometimes encounter problem on cranking the engine. I figured it's a low battery charge but one moment its ok, the next its dead, then ok, then dead.
I am 99% positive its the fpr. When you go to start your bike does it start to crank and just click? Then it wont turn over at all? Mine did that until I changed the fpr and I havent had an issue since.
 
  #10  
Old 07-12-2010, 09:41 PM
Junior Member
Thread Starter
Join Date: Jun 2010
Posts: 14
Default

it cranks and starts up. problem is, not all the plugs are firing and for those that do are only 35% efficient. the misfire makes the bike sound like a helicopter!

how do i check the FPR if its working well or not? does it include the fuel pump, coz i have replaced that before.
 

Thread Tools
Search this Thread
Quick Reply: Spark Plug always fouling


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.