Question about 2004 Suzuki RM 125

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Boging at take off an clears at high revs what should compression ratio be also spark plug gap

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Hi buddy spark plug gap should be 0.32 / 0.8mm and the compression should be 125-185psi try cleaning air filter also on carb is a screw turn this all the way in and unscrew 1 1/2 turns out and try this you will always get a bog at low rpm iff you throttle quickley get back to me boging at take off an clears at high revs - c64ac63.jpg

Posted on Sep 25, 2009

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Along with fuel and spark...you need enough spark and you need enough compression. Asssuming your rings aren't broken and you can feel good compression when you are turning it over, you can spray a little ether in the carburetor chamber. If there is enough spark and compression it will at least fire up momentarily.
Sometimes the rings or cylinders get scratched up because they run incorrect gas/oil ratios for too long and then when they sit for a while the oxidation fills in those scratched surfaces. Starting with high fuel to oil ratios is easier to start ( gas burns easier with less oil in it) but the engine will wear faster with high ratios.

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Sir, your question is not very clear, but I will still try to post a solution here. Engine missing could be due to any problem in fuel system, ignition system, engine or ECM as well.

LOW ENGINE IDLE SPEED (Poor idling):
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ROUGH IDLING:
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-Spark plug fouled, gap too wide or too short. (1.00-1.1 mm)
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HESITATION/ POOR ACCELERATION:
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-Fuel pump
-Spark plug
-Ignition system
-Fuel injector circuit
-E C M power source circuit
-Mass air flow meter
-Throttle body (do cleaning)
-Intake system
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Hi
General advice aplicable for all gas powered chain saws;
Clean air filter regularly.
-Adjust spark plug gap (very important). A faulty gap will either cause poor spark or a overloaded and damaged spark plug coil.
-Use correct good quality spark plug
-Use correct oil/fuel mix ratio and correct oil.
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Carburator adjustment;
-idle speed setting screw should be set so that the saw idles well, without engaging the chain. If you normally have to press the gas lever to be able to start it coul indicate a to low seting. Clockwise will increase idle speed. This screw is found near the carburator and is slightly larger the the two adjusment screws.
- fuel-air mixture screws can be set to standard factory setting as a start. Normally there are 2 screws labeled L and H, for Hi and Low rpm band adjustments. Factory setting are usually 3/4 turn out(anti clockwise) from fully closed setting for both (clockwise to closed position).
Experiment with adjustments by 1/8 increments at the time. Anti clockwise turning will increase fuel to air ratio and opposite. Warm weather will require a slightly leaner mix and cold weather will reqire a slightly richer mix(more fuel). Low rpm setting only serves the idling performance. The Hi rpm setting can be evaluated by removing the spark imediately after running at full load for a period. The spark plug should be dry, and be lightly brownish at the electrodes. White-ish color indicates low fuel to air mix, and this causes too high combustion temperature. A black colour indicates a too high fuel to air mix ratio, and it causes carbon build up on the plug.

If you still have starting problems, cylinder/piston compression is the next to check for. This is a more extensive job and should best be left to professionals, unless you are very skilled and have access to special tools required. Compression on modern saws are very delicately balance, so the slightest damage to either the rings, piston or cylinder can cause problems. Is is not alwas worth to replace the cylinder and piston kit, so compare prices and ask for advice at your dealer.

I hope this helps you.

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