Question about 2003 Yamaha WR 450 F

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No top end

Runs ok till about 1/2 throttle then just boggs idles great starts right up
has slight hesitation on cruise at lower rpm think it's lack of fuel checked and cleaned carb no difference problem started suddenly

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  • smeagal May 11, 2010

    try a new plugs or plug caps, could be breaking down and short out under load. hope this helps

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Does it have diaphram in carb if so check for slack

Posted on Jun 22, 2009

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No power and boggs on top end


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How many turns should i tweek the jets on the carbs. i have them at two and a quater turns now and it still dosent maintain a steady rpm. and it lacks a power in 1st and 2nd gear. ive tried quater turn...


The screw I think you are adjusting is the idle mixture screw, and will only make a differnce at idle
You set at the smoothest idle
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If power in 1 and 2 is the problem, then there is something else, make sure the carb is clean, the exhaust is not blocked , the air filter is clean and relatively new,valve clearances? are ok, new spark plug , new oil, and then start looking at the jetting.
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try riding with and without choke to get some idea, if it runs better with some choke then it is lean

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The owners manual for my Ryobi 210 describes carburetor adjustment but the photos do not show which screw is the idle mixture adjuster.


The Low speed adjustment screw is the one marked as "L" and would be adjusted during:
1. Idle - to insure running smoothly, and
2. Acceleration - to transition from Idle to High Speed.

The High speed adjustment screw is the one marked as "H" and would be adjusted during:
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The final screw is an Idle Set screw. This screw sets the actual speed of the Idle and is the screw attached to the end of the throttle cable as it terminates at the carburetor. Turning it:
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2. Counter Clockwise - reduces RPM's (slows down the motor)

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Rpm hunting


check for a vaccuum leak this is where i would start if it rolled into my shop. possibly a PCV valve sticking or a hole in the hose, this hose should run from the valve cover, or crank case and then to the intake, or carb.

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My poulan wild thing 2375 bogs out when throttle


Make sure that the air cleaner and muffler are not plugged. Check the carburetor screws and nuts for tightness. After turning both needles CW to stops (lightly), back them out CCW 1-1/2 turns each. Start the engine and allow to warm up. Open the throttle and adjust the H needle CW somewhat until the engine speeds up, but is 4-stroking. Correct adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Release the throttle and adjust L CW till the engine runs fairly smoothly, but allows the engine to 'follow the throttle'. Set the idle speed screw so that the chain doesn't turn, but the engine keeps running. Hope this helps!

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How do I adjust needle valves on a 25cc Homelite UT08111A Backpack leaf blower?


Set the lowend & highend needles to about 1 3/4 to 2 turns each. Choke the carb or prime it, until the carb is wet. Fire up the engine and let it warm up. Let's set the topend first since it's the easier of the two. Go to full throttle. Adjust the topend needle for peak RPM. Leave it wide open for about a minute to see if it changes any. Should the engine go lean, open the lowend needle slightly, if this dosen't work... you will have to adjust the needle valve inside the carb.( I will explain this later) If the topend runs OK, then slowly pull the throttle down until the engine begins to "four cycle" hold the throttle there. Adjust the lowend needle until the "four cycling" barely stops. Now lower the throttle more until it "four cycles" again, and adjust the lowend again. Keep doing this until you reach full idle. Now, from full idle begin to throttle up until the engine starts to bog or hesitate. Open up the lowend needle just enough to eliminate the bog or hesitation.

http://tech.flygsw.org/walbro_tuneup.htm

hope this helps :)
if it does please vote

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