Question about 2008 Yamaha yZ125
You say it's flooding - is fuel coming out the overflows? If so, you might need to replace the needle and seat, but based on the age of the bike, I wouldn't think you would have to do that yet. Even with a bike that is raced, you can get many, many years on the needle without having to replace it - unless something damaged it. Inspect the needle and seat closely for nicks or imbedded **** in the sealing area. Also - I assume you set the float properly. This is an important step. Personally - I think the factory setting is too high - since about 2001 I have set the float 2MM lower than recommended. Otherwise you will have fuel pouring from the overflows on the faces of jumps or in the whoops.
If the engine is "flooding" - it could be down on compression which will make it run rich. Or you might just have to re-jet but I would only re-jet if the engine is fresh. You can also try running a B8ES pluf - it's a step hotte than stock and what I ran. Keep in mind that the ring in a 125 doesn't last long at all. There's only one ring. I would replace the ring before each race when I was running 125s - this happened every week during the season. 2-3 ring replacements per piston, 4-6 piston replacements per cylinder.
If you provide more info, I can give you a better answer on your exact problem - I don't know if I really know exactly what the problem is.
Posted on May 20, 2011
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
Tips for a great answer:
Nov 26, 2014 | 2004 Yamaha YZ 125
May 13, 2011 | 2004 Yamaha YZ 125
Jun 19, 2010 | 2003 Yamaha YZ 125
Mar 10, 2010 | Yamaha YZ 125 Motorcycles
Oct 02, 2009 | 2004 Yamaha YZ 125
Aug 29, 2009 | 2004 Yamaha YZ 125
May 20, 2009 | 2003 Yamaha YZ 125
Apr 15, 2009 | 2003 Yamaha YZ 250
Apr 03, 2009 | 2003 Yamaha YZ 125
254 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: