Question about Honda CR 125 R Motorcycles

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It is leaking oil where the muffler connects to the moter. Could the rings be bad or am I mixing the fuel to rich?

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Ok i,m asumming you have a 2 stroke if theres a little oil the mixture is a little rich

Posted on Mar 25, 2011

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1 Answer

Backfires when I take off


backfires to the Aircleaner (can cough or pop)
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I would say it is not an issue with the piston and rings, any oil leaking from the muffler has to be unburnt oil from the fuel/oil mix, if not already you should run it at a 50-1 mix, also make sure the engine is not running too rich on the fuel screws, check the condition of the air filter as a blocked filter will richen the mixture.

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It starts, will accelerate, and leaking oil from the area of air filter


One of two things is happening here. One thing for sure is, the engine is NOT completely combusting the fuel/oil mixture in the engine. Your mix may have too much oil in it, the rings on the piston may be leaking, letting fuel by to the exhaust port. I would first pull and clean or replace the spark plug. If oil is coming out the exhaust, a partially fouled plug is probably part of the problem now. Check that your fue/oil mix is at the proper ratio. I would also remove and clean the spark arrestor in the exhaust port and the muffler itself if you want to keep it running.

May 08, 2011 | Craftsman Garden

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POULAN PRO CHAINSAW DOES NO WANT TO RUN AT FULL THROTTLE & WILL BOG DOWN UNDER LOAD. TRIED NEW GAS & CHECKED SPARK PLUG. HAD IT TUNED UP ONCE & STILL NO BETTER.


If this machine has a spark arrestor in the muffler this may be blocked, check around the muffler outlet for a gauze which may have carboned up.You need to find out if it is running rich, or lean which is causing the problem. too rich a fuel/oil mixture will also cause the machine to bog down at full revs, it should run a 50-1 mix with good quaility two stroke oil. If it is running too lean it will also cause this type of problem ( blocked fuel filter, cracked fuel hose, dirt in the carb )

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1 Answer

Chainsaw starts but will only run for a short time and then quits


Suggest that you don't use the carburetor cleaner as it disturbs the fuel mix ratio. Use it only with 4-stroke engines. 2-stroke engines depend on the correct quantity and quality of oil mixed with the fuel for engine lubrication--if starved for oil, it will quickly ruin the cylinder wall, piston skirt, and rings. Remove the muffler and spark plug--inspect the cylinder and piston skirt/rings for any severe scoring while pulling the engine through slowly. If ok, check the muffler for plugging while it is off, and check the air cleaner for plugging as well. You didn't state completely what your problem was--help. Hope this helps1

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1 Answer

I have an Echo Backpack Blower PB46-LN that is leaking black oil out of the muffler, its easier to start when its cold but when its hot it difficult to start, also I dont even need to prime it to get it to...


This senerio is an 'over-rich' condition, most often caused by an improper fuel/oil ratio mix, and the 'exhaust screen' or 'spark arrestor' on the outlet of the muffler is plugged. Cleaning the screen may be all that is needed to correct the problem. **Make sure this screen is clean, and operate engine for at least 5 minutes before making any of the suggested adjustments below.

Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated

Overfuel or 'rich' condition
Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check Air filter for fuel saturation
4) Allow engine to run for 5 minutes to excess fuel from muffler
5) Fuel mixture ratio: Make sure the oil mix is per your manufactures recommendations
6) If after the above the engine is still smoking and blubbering:
Adjust carb mixture screws to a 'less rich' setting
*NOTE: only move mixture screws 1/8 of a turn at a time,
and try operation before any more adjustment

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What would cause smoke to come out the exhaust pipe


WHITE SMOKE IS BLOWN HEAD GASKET. BLUE SMOKE ENGINE BURNING OIL.DUE TO WORN PISTON RINGS AND WORN VALVE GUIDES.BLACK SMOKE EXCESSIVE RICH MIXTURE.CLOGGED AIR FILTER. FUEL PUMP PRESSURE TOO HIGH.SEVERE MISFIRE.LOW ENGINE COMPRESSION.

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Sounds like your running a bit rich. Try leaning down your air/fuel ratio.

Aug 23, 2009 | Sport & Outdoor - Others

1 Answer

Gas/oil mix


Most trimmers are using a 50:1 mix. 2.6oz/gal or 6.4oz/2.5gal. A 4oz/Gal is a 32:1 mix which way too oily and you will have problems of excessive smoke, oil leaking out muffler, carbon buildup causing sticking piston ring or a clogged spark arrestor.

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6 Answers

86 kawasaki kx250 rich mix problem


"Learn to like smoke for awhile. Smell the aroma". Pardon the humor. I couldn't resist. Chances are there is oil built up in the crankcase. It is going to take some time for the oil to dissipate. How long? I don't know. It all depends on how much is in there. Cleaning the muffler is no help since the oil burning is coming from the crank not the muffler. If you are careful, and keep a vigilant eye, you could cut the gas/oil mix in half to 64 to 1 instead of the normal 32 to 1. That would mean only 2 ounces of oil per gallon instead of the normal 4 ounces. Let the crank add the rest. This will help burn the crank oil excess, but BE CAREFUL. When the crank drys up you had best not ride until more oil is added to the gas.

A “very helpful” rating for this answer? Thanks!

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