Question about 2003 Yamaha YZ 125

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I have a 1988 yamaha blaster and the carb has been cleaned several times but now when I put the carb back in and then hooked up the fuel line the carb started leaking out the overflow hose. An so I cannot figure out wats wrong.

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It sounds like the float got stuck in the open position when you went to reassemble the carburator, thus allowing fuel to flow constantly. With the handle end of a screw driver try tapping the bowl a few times. This may free it up, but If the leaking doesn't stop your going to need to take it apart again and check the float assembly again.

Posted on Jan 04, 2011

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Posted on Jan 02, 2017

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Yamaha Blaster won't start, carb is good, has a new plug, tried the fuel in the plug thing still no go, what do I check next?


Hi, Phillip and the usual suspects are:
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Hey Anon, sounds like you may have done something wrong when reassembling your Blaster... When you "cleaned" the carb, you may have reassembled it incorrectly.. This sounds serious!!.... this situation is difficult to diagnose on-line.. I wish you were near me.. . (North Alabama) .. I am a 40+ years Yamaha Factory tech... I could fix it...

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I think someone hooked up fuel lines wrong. The bike runs out of fuel when the fuel switch is on. Both lines out of tank go to secondary tank and bottom line on secondary tank has fuel filter and goes to...


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ALWAYS have a fire extinguisher on hand when working on carburetors.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb.
Before putting the slide back in the throat of the carb, move the clip on the jet needle one notch lower. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.

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1 Answer

Carbeurator?


remove gas line from carb and turn on gas if no gas tank and line need cleaning. if there is gas need to remove carb and clean jets. before you remove it seal off the back of carb with hand and have someone to kick it over a few times if its a small clogg this just might remove it GOOD LUCK

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1 Answer

My FZR 600 is acting up and backfires


I have had several bikes in my time. and keeping the carbs syncranized is very important. Did you put aftermarket pipes on it? try rejeting the carbs up 2+mm that may help the fuel air ratio?

Feb 01, 2009 | 1988 Yamaha XJ 600

1 Answer

Long rest


OK, this is what the StreerRodders face all the time.

1) Pull all the plugs and get new ones ready.
2) Drain the Oil and replace with 10W-30 with new filter
3) Check the water level in the radiator - make sure up to level
4) Put several ounces of sea-foam down each cylinder
5) Hand crank engine over several times
6) Use starter motor to spin over motor several more times
7) Put Spark Plugs back in.
8) Make sure fuel in fuel tank is drained
9) Add new premium fuel - Use an air hose to clean the fuel line to the engine
10) Pump through new fuel by loosening the fuel line by engine and pumping a bunch through - hook back up tight.
11) Try starting engine -
12) If Carb engine use a bunch of carb cleaner in the carb before starting to clean out most or junk
13) Once engine is started monitor oil pressure and temperatures carefully - run for about 10 minutes
14) Stop
15) Drain Oil - replace filter again - put in new synthetic oil - recommend Amsoil 0-30W
16) Drain radiator and flush out -
17) Reset radiator fluid and top off.
18) check for leaks everywhere
19) Start again and drive carefully for 100 miles and you should be good to go.

Regards,

Doug

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