Question about 2003 Yamaha YZ 125

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Hp of a 2003 yz125 with fmf rev and prosercit shorty

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Hi, Drd4 hard to say my DYNO got repossessed for more information about your question and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals
yz 125 tips and tricks YouTube
Yamaha YZ 125 05

Posted on Jul 19, 2016

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Posted on Jan 02, 2017

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Alrite ? Iv got a yz 125 2001 it's had new piston


Hi, Dean for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals
yz 125 tips and tricks YouTube
Yamaha YZ 125 02

May 11, 2012 | 2003 Yamaha YZ 125

1 Answer

Gear problems yz125 2001. i have rebuilt my engine and it starts fine, but when i rev it it sometimes clicks like its going into gear but jumps right back out and when putting it into gear i can only get...


Hi, Anonymous for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
yz 125 won shift Yamaha 2 Stroke
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YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Dec 12, 2010 | 2003 Yamaha YZ 125

2 Answers

I have a 1992 yz125 runs good but when riding its like it has no power


Lack of power is usually bad valves. Clean the air cleaner and do a compression check. Could you take a moment and rate my answer? Thanks!

Sep 20, 2009 | 2003 Yamaha YZ 125

1 Answer

2001 yz125 exhaust


if you have any friends that weld. ive had this problem myself and have found it cheaper and less stressful to fabricate yourself than to search any further

May 10, 2009 | 2003 Yamaha YZ 125

2 Answers

Crf 150f backfire


change the jetting...youcan contact FMF for thier setup recommendations for running that pipe with the bike...very common problem and jetting will take care of alot of the issue

Mar 31, 2009 | 2003 Honda CRF 150 F

1 Answer

Oil


I have an 04 125 with a FMF fatty Factroy expansion chamber and a Titanium 2 FMF silencer (shorty) the carb settings are Pilot a size leaner than stock main IS stock jet needle is a setting toward lean and air screw is two turns out. My gas:oil mix is around 32:1 - 40:1.. My spark plug buget is killing me, and I havemessed with it til I was blue in the face can anyone help me?,don't worry I didn't take it wrong it is a good question, and let me put it this way.. I run it like a two stroke lol I have had more than my share of two strokes so I don't lolly gag it and usually for the trails I ride you really can't get out of 1st most of the timeI spend most my time around 3/4 throttle. When I 1st got the bike I had a friend messing with the idle screw on it cause it wouldn't idle at all and he messed with the mix screw by accident so I think it was screwed out more than two turns but I set it according to FMF recommendations with the pipe and chamber. The guy who had it before me raced it in a AMA class I don't know which so don't ask lol, so who knows what has been done to it other than what I can see,,,

Nov 10, 2008 | 2003 HM Motard 125

1 Answer

Oil


I have an 04 125 with a FMF fatty Factroy expansion chamber and a Titanium 2 FMF silencer (shorty) the carb settings are Pilot a size leaner than stock main IS stock jet needle is a setting toward lean and air screw is two turns out. My gas:oil mix is around 32:1 - 40:1.. My spark plug buget is killing me, and I havemessed with it til I was blue in the face can anyone help me?,don't worry I didn't take it wrong it is a good question, and let me put it this way.. I run it like a two stroke lol I have had more than my share of two strokes so I don't lolly gag it and usually for the trails I ride you really can't get out of 1st most of the timeI spend most my time around 3/4 throttle. When I 1st got the bike I had a friend messing with the idle screw on it cause it wouldn't idle at all and he messed with the mix screw by accident so I think it was screwed out more than two turns but I set it according to FMF recommendations with the pipe and chamber. The guy who had it before me raced it in a AMA class I don't know which so don't ask lol, so who knows what has been done to it other than what I can see,,,

Nov 10, 2008 | 2007 HM CRM 125R

1 Answer

Oil


I have an 04 125 with a FMF fatty Factroy expansion chamber and a Titanium 2 FMF silencer (shorty) the carb settings are Pilot a size leaner than stock main IS stock jet needle is a setting toward lean and air screw is two turns out. My gas:oil mix is around 32:1 - 40:1.. My spark plug buget is killing me, and I havemessed with it til I was blue in the face can anyone help me?,don't worry I didn't take it wrong it is a good question, and let me put it this way.. I run it like a two stroke lol I have had more than my share of two strokes so I don't lolly gag it and usually for the trails I ride you really can't get out of 1st most of the timeI spend most my time around 3/4 throttle. When I 1st got the bike I had a friend messing with the idle screw on it cause it wouldn't idle at all and he messed with the mix screw by accident so I think it was screwed out more than two turns but I set it according to FMF recommendations with the pipe and chamber. The guy who had it before me raced it in a AMA class I don't know which so don't ask lol, so who knows what has been done to it other than what I can see,,,

Nov 10, 2008 | 2004 HM CRM 125

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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