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Mikuni ucal carburetor diagrams

I have a 2003 Yamaha ttr 125 and the carb overflow leaks

Posted by Anonymous on

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Many things can cause this;
check the following.

1. trash(including rust in the tank if metal) in the tank/carb. If the carb set for more than 6 months it may need the fuel system cleaned out(includes the carb). Putting a filter in the system will not take care of the rust problem in most cases. If the tank is metal and has rust it will need a tank liner kit like the brand "kreem" or the equivalent.
2. the needle/seat combination and/or float is incorrectly set or bad causing that fuel level to get high in the bowl. Check the float height according to the manual or replace the float/needle/seat.
3. bad seat o ring if it has one and also a petcock that does not shut off. If you can jog the seat around in the carb, then the o ring is probably bad. If you disconnect the fuel line from the carb and gas still comes out, the petcock is most likely bad or it has trash in it.

Posted on Aug 31, 2014

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SOURCE: 2000 yamaha mikuni carb run an no power takes off sputters

sat 4 a wile clean lo and hi speed jets needle clip up 4 more lean down 4 more rich check plug 4 color if no clip must use .005 washer under needle 2 richen

Posted on Apr 28, 2012

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Hi, Kevin always check fuel flow first to isolate the problem area otherwise the usual suspects are:
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2. Fuel cap or fuel tank not venting properly.
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4. Fuel valve/petcock not in the on or reserve position.
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Hi, Anonymous and the usual suspects are:
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Hi, Anonymous and the usual suspects are:
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11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
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