Question about 2005 KTM EXC 125

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Installing an exhaust

Hey all! I have an '03 KTM 125SX. Im installing a FMF Fatty Pipe with a Powercore 2 Silencer. Now when i install it do i have to seal the part where the pipe and the silencer meet? My stock pipe that's on it now have a little rubber boot that seals it. It's broken of course and leaks carbon all over my kick starter and swing arm

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But I was curious if I need some sort of rubber seal or a sealing compound for it. Thanks a lot!No you dont absolutly need it but it would be smart to have because I had the same thing happen on my yz125 and the carbon went everywhere and staind my swingarm. I just used a piece of old radiator tube because it was cheap and I didn't have to order it.,

Posted on Nov 10, 2008

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Posted on Jan 02, 2017

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I just put a new fmf fatty pipe and a power core 2 silencer on my bike (1994 yz 250) and now when I start my bike it will run for like 10 sec and then It will bog down and die on me. Then it wont start,...


if the bike was running fine before you replaced pipe,you may need larger jets,or richen fuel mix,also check the reed valve it may be on the weak side.try a new spark plug also if you have not already replaced it.

Feb 20, 2011 | Yamaha YZ 250 Motorcycles

1 Answer

I just recently installed an fmf powercore 4 muffler on to the stock heaader of my 08 crf 150rb and i turned it on to see how it sounds and after haveing let it idle for a couple minutes i noticed that the...


hi this might help,by fitting an after market exhaust system you will probably have leaned out the fuel air ratio in the carb(less back pressure in the exhaust system)you will need to have the carb rejetted to suit the exhaust modification,if you keep running the bike as it is you will inevitably seize the motor as it is running way to lean .cheers

Feb 18, 2010 | 2005 Honda CRF 150 F

1 Answer

2005 ktm 125 engine is froze up


Sounds like a major broken bike!
What i do, is remove the gear that runs between the crank, and clutch to see what end is frozen, the transmission, or the engine.
You can also take off the exhaust pipe and look in the hole for damage.

Nov 04, 2009 | 2005 KTM SX 125

1 Answer

Best silencer for a 2 stroke rm250


you can drop decibles on your stock silencer, by wraping it with hight temp exhast wrap from the automotive performance industry.

Oct 30, 2009 | 2004 Suzuki RM 250

1 Answer

New slip-on FMF Powercore 4 on 02' TT-R250


i looked up in the book for jets for your bike,i diden't see any.you could try to drill out the jet but they are brass.and very fragile.unless you are a machinest.also did you upgrade your air filter to go along with your new exhaust?

Apr 13, 2009 | 2002 Yamaha TT-R 250

3 Answers

Oil


you are running to rich by the sounds of it ..dave

Nov 10, 2008 | 2005 KTM SX 125

2 Answers

Maintenance


gas/oil ratio should be 40:1 synetic.empty tank drain carb bowl thats it l have 92 250 exc. It has fmf pipe &silencer boyesson rad valve, been ported ,crank has been balanced,PVL ignition. I use spectro synetic 36;1 to keep it well lubed at wide open. ,,,

Nov 10, 2008 | 2005 KTM MXC 300

1 Answer

Maintenance


gas/oil ratio should be 40:1 synetic.empty tank drain carb bowl thats it l have 92 250 exc. It has fmf pipe &silencer boyesson rad valve, been ported ,crank has been balanced,PVL ignition. I use spectro synetic 36;1 to keep it well lubed at wide open. ,,,

Nov 10, 2008 | 2005 KTM EXC 300

1 Answer

Mods


For more power you can port the engine but I would start with performance Reeds. Also would adjust suspention and revalve if needed. That would be it for me…,,

Nov 10, 2008 | 2003 HM CRE 250

1 Answer

Dirtbike eahaust pipe comprison -which is best


I know there were a few different models: X440S only FMF Powercore aluminum silencer/stainless header combo E440/C440 standard header/silencer with midpipe attached (long can) (2 spark arrestors) S440 standard header/shorty silencer with seperate midpipe (1 spark arrestor) X440 standard header/silencer (NO spark arrestors) Just wondering whether anyone has ever done any hp tests between these. From my experience the X440 can would flow the best because of the lack of spark arrestors but I'm wondering how the FMF powercore compares? The FMF has shorter header runners leading to the merged portion so the shorter header should deliver more low end torque. Also do I have the S440 can info right, only 1 spark arrestor in the shorty?,The so-called S440 pipe did not have a separate midpipe. It had a fixed welded inlet, same as the longer can, and was full open. Also, I have a New 03 X440 here with the SAME exhaust, ...but another with a long and full-open version. So, you really cannot tie all exhaust versions to a particular model, since too many owners will get confused. Everybody would need to check their own machine to be sure. But if ANYBODY out there has a separate midpipe?, I'd really like to confirm wazzup -- Up until now, I have thought that the only ones around are from the small batch that I had found over in Holland. And, on just a few bikes that were assembled in Europe just prior to the bankruptcy. ,,,

Nov 10, 2008 | 2005 ATK 450 Enduro

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