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I have a 98 Yamaha TZR 125 which sat for 6 months and wouldn't start. I cleaned out the carb. , jets and float. It ran perfectly. I tried to start it a week later. No go. Another cleanout, and ag

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SOURCE: wr400 2000yr hard starting & won't idle

buddy change the plug also on the carb there will be a idle screw turn this in 1/4 of a turn with the machine running and get back to me 724a8c7.jpg

Posted on Sep 17, 2009

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SOURCE: KLX 125 sat for 2 years, carb removed, cleaned,

have u cleaned the reed valve out?

Posted on Apr 09, 2009

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SOURCE: Yamaha 2001 ttr 250. Bogs above half speed, under load

I have the same problems with my 1999 TTR 250, were you able to find out anything?


Posted on Aug 07, 2010

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SOURCE: I have a 2001 Suzuki RM 125, it won't start

hi mate i had a rm 250 with the same problem, have you done a compression test, as mine had poor compression

Posted on Jul 24, 2011

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2000 Yamaha WR400 wont run with choke off.

Hi, Anonymous 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.
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YAMAHA WR426F Owner Service Manual
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May 19, 2012 | 2000 Yamaha WR 400 F

1 Answer

I have a 1985 Yamaha maxim that hasn't been ran

Spray starter into the carb intake with no choke, if she runs for a few seconds then you know its fuel starvation
clean jets & airways & blow through with compressed air

Nov 20, 2011 | 1985 Yamaha XJ 700 S Maxim

1 Answer

I need a carb diagram for yamaha tzr 250 cc motor cycle year 1988 it will not rev with out choke on . blocked jets?

Hi, Rolandwhitfo 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. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
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.
Will start but wont stay running without choke Yamaha Outboard Parts Forum
Yamaha TZR250 1987 Service Manual
OEM parts for Yamaha

Aug 08, 2011 | 1988 Yamaha TZR 250

1 Answer

2006 yz 125 starting problem - bike ran out of fuel at high rev's , added more fuel at 150ml oil to 5 lt petrol ratio and still no go. i presume the jet is now blocked from sucking the last bit of muck...

Yes, it's never to good to run anything bone dry, a little muck is all it takes to ruin your day.
First, make sure you are getting fuel to the carb through the fuel line...if you aren't back track up towards the tank until you find the restriction and clean it out. If your are getting fuel to the carb, check the float bowl to see if the carb bowl is filling up. If no fuel the float is stuck and the float needle has got the fuel shut off...try tapping the sides of the bowl with a plastic screwdriver handle and blowing on the fuel line,,,you might get lucky..if know what you gotta do,
Good luck, hope this helps.

Jul 17, 2011 | Yamaha Fuego 50 2T Motorcycles

1 Answer

2008 yamaha yz 125 carburator flooding out, cleaned carb, checked reed valve, still flooding out?

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.


May 20, 2011 | 2008 Yamaha yZ125

1 Answer

HOW DO YOU REMOVE, CLEAN AND REPLACE JETS ON A tzr 50. Is there any information/ diagrams available to view?

Just remove the carb, turn upside down,undo the 4 screws holding the float bowl on,and the jet on the top is your main jet and can be removed /replaced using a 6mm spanner.The pilot jet is lower down ,closer to the front of the carb and can be removed with a screwdriver.

There is also the needle jet which is held in by the main jet and can be removed by simply tapping it down once you have removed the main jet.
But for basic tuning you need only change one jet(main jet).

Please leave positive feedback if this has helped you


Aug 09, 2009 | 1990 Yamaha TZR 250

1 Answer

Blaster wont start

Hi, If it starts on ether, then the plug is probably not too bad, spray your premix in instead and if fires OK then your carb is clogged, you can start with the float valve, open the drain screw on the float bowl and make sure it is filling, if it is, then its probably the jets or vanes are lacquered from sitting and they simply must be cleaned. Air pressure and a carb solvent works good when cleaning but other than that no magic. Good Luck, this should Fixya!

Feb 28, 2009 | 2003 Yamaha YZ 125

6 Answers

Yamaha TTR 125 L won't idle

this is very tipical. when bikes are stored the fuel varishes up the jets & needles. soak the carb. moving it back and forth in the soak solution. then blow every jet and orfice with a controlled air source. note: any speck of rust or dirt can plug these jets. pay attention to detail and do every thing twice. then install the carb and adjust it to your riding style. later Spike

Nov 26, 2008 | 2004 Yamaha TT-R 125 L

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