20 Most Recent 2008 Yamaha yZ125 Questions & Answers


Yamaha YZ400 E Owner Manual

2008 Yamaha... | Answered on May 27, 2018


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2008 Yamaha... | Answered on May 01, 2017


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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Yamaha YZ125T1 Owner Service Manual
OEM parts for Yamaha
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Yamaha YZ125 2008

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

2008 Yamaha... | Answered on Apr 05, 2017


1) Is the choke stuck on? Solution: spray carb with WD40 and make sure it moves freely when you pull the choke on and off.
2) are you using the correct 2T oil? It may be that it is pumping too much oil through. TIP: Take out plug and look at colour. if it is brown/tan it is ok. if it is white then there is not enough fuel going in. if it is black and sooty then there is too much fuel (choke stuck on) if it is black and oily wet there is too much oil (adjust the oil pump as per handbook)
3) Could be ready for a decoke. How many miles has it done? Solution: REDEX teaspoon down spark plug hole, turn engine on kickstart with ignition turned OFF. Wait a few mins and start up bike as usual,a few revs should chuck out loads of smoke and clear its guts out.

2008 Yamaha... | Answered on Mar 06, 2014


I don't have an exact for your model but resistance issue will be very easy to spot as when you test you will get usually zero as the reading if faulty
roughly speaking you would expect 240 - 380 and 720 - 1000 and 40 - 66 on the three pairs of wires coming direct from stator if you get zero as the reading on any of the 3 pairs then the stator is the fault... Rarely does the coil pack fault without impact or over heat but for the coil pack 0.08 - 0.10
let me know if you need clarification on testing ... Good luck!

2008 Yamaha... | Answered on Aug 23, 2011


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.

Scott

2008 Yamaha... | Answered on May 20, 2011


JYACEO5C6YA003794 is not a valid VIN. However, JYACE05C6YA003794 is valid. The letter "O" is never used in a VIN. Below is the info requested. :-) tombones49_275.gif

Yamaha Fuego 50... | Answered on Sep 03, 2011


There are a lot of tiny fuel and air passageways in the carburetor that must be kept clean it order for your scooter to run right. Carefully, take the carburetor apart. This can be relative easy. The carb has tiny passages that can get gummed up. Your bike will not run correctly if the carburetor isn't completely clean, so take your time. I use a gallon container of carb dip (you can get a gallon at your local auto supply store).
First, remove all of the rubber and gaskets or they will get damaged. After a 20 minute soaking in carb dip, I blow out the carb with compressed air. You have to get all the jets and the passageways clean. Be sure the jets are clear, especially the starter jet. Sometimes carb cleaner won't clear out these tiny jets. Use a guitar or a piano string, a strand of copper electrical wire, or a tiny drill bit pin vise. Be sure not to increase the size of the hole in the starter jet or you'll change the tuning. Carefully reassemble everything, checking for cracks in the rubber carb boots and the gaskets. Replace them if they are old and cracked. Be sure and remove all rubber and gasket material first or they could get ruined. Spray carb cleaner also works if you're diligent.
If you have an electric choke, check it to make sure it works. Check the resistance between the wires - you should see around 10 ohms or less. Measure the length of the choke assembly. Remove the choke from the carb and plug the wires into a 12V source for 15 minutes. The choke body should be warm. Measure the length again - it should increase by around 1/8".
Next, consider whether your exhaust pipe is clogged. This is especially a problem with older two stroke scooters. The unburned fuel/oil mixture builds up in the exhaust pipe along with carbon over time. If the exhaust pipe is clogged, your scooter will run terribly or not at all. It can be difficult to tell if the exhaust pipe is clogged. The easiest way to tell is to remove it and try starting your scooter. It will be a bit loud - two strokes will sound like a chain saw. If it runs with the exhaust pipe off, you know that is the problem.
put a meter on the kill switch to see if you get voltage across it and check the magneto i would think that the contacts have gone rusty clean them with some fine sandpaper
also if the bike has been standing for a long time(six months or more) then replace the fuel because when its old it loses some flamabilty

hope this helps

John

Yamaha Fuego 50... | Answered on Aug 25, 2011


Hi and welcome to FixYa, I am Kelly, Cylinder nuts= 22 ft-lbs / 264 inch lbs
Head nuts= 20 ft-lbs / 240 inch lbs If you had to change any crankcase studs the stud torque is 9.4 ft-lbs. / 112.8 inch lbs Thanks for choosing FixYa, Kelly

Yamaha Fuego 50... | Answered on Jul 23, 2011


best to remove them

Yamaha Fuego 50... | Answered on Jul 10, 2011


ATF is normally about 12 weight. You can use it if that weight works for you. I'll let someone else handle the how much part of your question.

Yamaha Fuego 50... | Answered on Jul 08, 2011


I don't have the factory manual for the 83, but if the bolts are M8 x 1.25, the torque specs are 30NM. The oldest YZ book I have goes to 96, I checked for 96 to present is all the same. That is the standard torque for a fastener that size. Good luck!

Yamaha Fuego 50... | Answered on Jun 11, 2011


It may be pop riveted, I know on the WR the plastic guard is fitted in Australia, not Japan, and they use what is called a rivnut, which is like a rivet but leaves a thread to screw into.
So if it looks like a pop rivet, it may be.

Yamaha Fuego 50... | Answered on Jun 07, 2011


On a MX race bike like that you really don't check them just replace the oil regularly - every 2-3 hours ride time would be OK but if you can afford it then more often the better
Just double check with your local Yamaha shop for exact amount to refill back in to be certain is correct amaount but it will be approx 650mL

Yamaha Fuego 50... | Answered on May 23, 2011


Did you check/clean your air filter? I had a no start issue with my Yamaha RD350 where the filter box was tight up against the seat and no air was getting into the carb. Do you have compression? Is the cylinder still attached by the connecting rod? Have you recently made any changes (like new jets) or repairs to cylinder or rings?
usually it comes down to an air intake issue if you have a working cylinder in a motor with gas and spark unless your timing is so far off that it isn't firing during the compression. But it might still backfire if it's off?

Yamaha... | Answered 2 days ago


The gear cogs might have moved or damaged. Better get a repairman to have a look at it.

Yamaha... | Answered 2 days ago


I always add about 10% oil to my small engines to help protect them from friction. If it starts ok with that much oil, it might smoke a bit and cause a little carbon build up on the plugs or valves, but most engines after 1980 are high enough heat and compression ratio to clean themselves up.
Sometimes the oil doesn't blend in all the way without some sloshing around.

Yamaha... | Answered 3 days ago

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