Question about 2003 Yamaha YZ 125

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Hello, I have a YZ 80 and i was wondering why my

Hello, I have a 1986 YZ 80 liquid cooled and i was wondering why my bike runs good at and idle but as soon as i put it into gear it wants to die out i have changed the carb, the spark is good, and the reeds are fine...the bike fires up nice just will not hit powerband and wants to die

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Look at ?

crank seal (drawing air)

ring wear

main jet (blocked jet's)

fuel starved carb

Posted on Jul 15, 2009

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I just did the top end on a YZ 125 put V-Force reeds and the bike doesn't start unless I pop start it and then it runs for a little bit but if I give it to much throttle it dies and very hard to start


Hi, Chad and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on blue links below. Good luck and have a wonderful day.
Bike dies when you give it throttle
YZ125 starts then dies after day of running fine
Yamaha YZ125T1 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Feb 23, 2017 | Yamaha YZ 125 Motorcycles

1 Answer

RM 80 1986-1987 wont start


put compression gauge in spark plug hole and if its less than 100psi then you need a new oversized piston and rings ! gaskets also !!!

Jan 25, 2014 | Suzuki Motorcycles

1 Answer

Exhaust is glowing red After two minutes


Hi, Anonymous a YZ is a motocross bike designed to run flat out that being said if you are strolling down some scenic trail at a slow pace or letting the bike idle for a few minutes your header pipe will turn cherry red, why you ask? It is not a street bike, it is designed for competition and weight is a major factor all necessary components are of the smallest and lightest design necessary to maintain performance under extreme conditions ie. small radiator and inside frame oil reservoir that doesn't get cooled, the majority of your riding needs to be at high speed. 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.
Yz450 exhaust glowing red after 2 seconds of idling YZ 400 426 450
Exhaust pipe glows red hot
YAMAHA YZ450F Owner Service Manual
OEM parts for Yamaha
http://www.yamaha-motor.com/assets/service/manuals/2004/lit-11626-17-11_784.pdf

Sep 05, 2013 | 2004 Yamaha YZ 450 F

1 Answer

Red hot exhaust pipe


Hi, Anonymous a YZ is a motocross bike designed to run flat out that being said if you are strolling down some scenic trail at a slow pace or letting the bike idle for a few minutes your header pipe will turn cherry red, why you ask? It is not a street bike, it is designed for competition and weight is a major factor all necessary components are of the smallest and lightest design necessary to maintain performance under extreme conditions ie. small radiator and inside frame oil reservoir that doesn't get cooled, the majority of your riding needs to be at high speed. 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.
2014 YZ450 Exhaust pipe glowing red at idle YZ 400 426 450
Exhaust pipe glows red hot
YAMAHA YZ450F Owner Service Manual
OEM parts for Yamaha
http://www.yamaha-motor.com/assets/service/manuals/2004/lit-11626-17-11_784.pdf

Sep 01, 2013 | Yamaha YZ 450 F Motorcycles

1 Answer

Yz450f overheating


Hi, Anonymous a YZ is a motocross bike designed to run flat out that being said if you are strolling down some scenic trail at a slow pace or letting the bike idle for a few minutes your header pipe will turn cherry red, why you ask? It is not a street bike, it is designed for competition and weight is a major factor all necessary components are of the smallest and lightest design necessary to maintain performance under extreme conditions ie. small radiator and inside frame oil reservoir that doesn't get cooled, the majority of your riding needs to be at high speed. 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.
Yz450 exhaust glowing red after 2 seconds of idling YZ 400 426 450
what would cause the header to glow red
YAMAHA YZ450F Owner Service Manual
OEM parts for Yamaha
http://www.yamaha-motor.com/assets/service/manuals/2004/lit-11626-17-11_784.pdf

Sep 27, 2012 | 2004 Yamaha YZ 450 F

1 Answer

How to install a headlight on my yz80


Hi, R77allen 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 $8 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.
how to instal lights and thermometer in motocross yamaha yz 80
How to install led headlight on dirt bike with no battery
Yamaha YZ80 service manual repair 2001 YZ 80 YZ80LW Download Manuals... $8 cheap
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YAMAHA YZ85 Owner Manual

Oct 13, 2011 | Yamaha Motorcycles

1 Answer

2000 Yamaha YZ 80 poor idling


Hi, Shaundavies6 and the usual suspects are:
1. Idle speed improperly adjusted.
2. Air fuel mixture screws not properly adjusted.
3. Inlet system air leak.
4. Leaking accelerator pump.
5. Loose low-speed jet.
6. Plugged low-speed jet.
7. Contaminated or plugged low-speed circuit.
8. Enrichner valve/choke not seated or leaking.
9. Multi carburetors out of sync and need to be balanced.
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.
Yz 80 2001 model Carburetor tunning Trouble
Life On 2 Wheels
Yamaha YZ80 service manual repair 2001 YZ 80 YZ80LW Download Manuals... $8 cheap
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Oct 24, 2010 | Yamaha Motorcycles

2 Answers

Crack in my yz 125 2001 crank case


some jb weld shouls work fine on it just get it good and clean no oil or paint on the crack. or find a tig and weld it.

May 10, 2009 | 2003 Yamaha YZ 125

1 Answer

Yamaha 2006 yz 250f gets over heated


Hello,

It is normal for the bike to overheat when idleing !

This bike needs air to pass through the radiator for cooling purposes. Air speed needs to exceed 40 kilometres per hour for effective cooling.

A good tip is to use only coolant in the radiator. Do not mix with water.

Cheers

Jon

Mar 23, 2009 | 2004 Yamaha YZ 250 F

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