Question about Homelite Factory Reconditioned 26cc Gas-Powered MightyLite Hedge Trimmer

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Engine runs but blade doesnot

Opened gear casing looks okay. compression is 35 psi fuel is fresh spark plug looks good

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The clutch is not engaging or the linkage to the eccentric that moves the blade is not connected.

Posted on May 26, 2009

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I have a 88 b2200. It shudder, jumps in all gears, has power loss and gains and poor milage. I've rebuilt carb, changed plugs and wires, disributer and pvc valve. Any ideas. Thanks


I would do a compression test of the engine. Spend about $40 for the gauge tester and do it yourself. Engine should be at operating temperature, remove all spark plugs, disable ignition by grounding the high tension cable from coil to distributor, screw in the gauge to one cylinder, hold the gas pedal to the floor-or hold the throttle at wide open, then crank engine for about 5 seconds. You will have a compression reading that should be somewhere between 100 psi and 200 psi. Anything below 100psi means not enough compression in the cylinder to produce power when running. Do each cylinder the same-crank the same amount of time for each cylinder( with wide open throttle). All compression readings should be fairly close-lowest reading must be within 75% of highest reading cylinder for a good, healthy engine.

If compression is low in any cylinder, it probably won't even fire the air/fuel mixture. Look for valve problems, valves not sealing (burnt valves cause this), or piston rings worn too bad, head gasket failure can cause low compression. Example, compression tested a Nissan, and readings were all 155-160 psi in all cylinders, so compression was excellent, engine was internally good. If you have good compression in each cylinder, look elsewhere like a plugged catalytic converter-won't let the engine breathe, or a problem with the ignition system-test for a snapping, blue spark when cranking the engine, on one of the spark plug wires. Others: check EGR valve for being stuck open, good luck, then.

Apr 06, 2015 | Cars & Trucks

1 Answer

While riding 1993 katana gas went into my crank case what caused this? And how do I fix it?


There is really only one way that gasoline can get into the crankcase, and that is through one or more cylinders. My guess is that you either have a carburetor that is providing a too rich air/fuel mixture, you have one or more spark plugs that are not firing or firing irregularly, or, in the worst case, you have badly worn cylinders/piston rings. Remove the spark plugs and look for a plug, or plugs, that are wet with gas, and/or black with carbon. Connect the plug wires to all of the spark plugs and lay the plugs against the cylinder head. Now crank the engine over and make sure that you have good spark (wide and blue in colour) at each plug. If you have no spark, or a small yellow spark, then you either have a bad plug (change all four) or a bad coil. If the spark is good then do a compression test on the engine. The compression should be around 150 psi and fairly close between cylinders (less than 10% difference). An engine overhaul is going to be needed if your compression readings are much lower than 150 psi or vary widely. If compression and spark are OK, then you need to check the carb(s).

Apr 28, 2014 | Motorcycles

1 Answer

WHEN I GIVE IT GAS IT START TO MISFIRE


Misfires are caused by one of 3 things-gas, spark, or compression-one of those is the problem. For gas, check the fuel pressure and see if it is at the right pressure for your car. Low fuel pressure will cause misfires. If pressure is good, it could still be an injector problem, like a clogged injector. If low pressure, suspect the fuel pump or the fuel filter.
For an ignition spark problem, check your spark plugs. Pull them out and inspect them for broken or cracked plugs, check the spark plug gap, check for oil fouled plugs. You may be able to isolate the misfire to a cylinder or two by the plugs condition. A misfiring plug or cylinder should show more black, sooty deposits than the other plugs. A normal firing plug will have a tan or brown colored insulator on the end with very little deposits. If the plugs are okay, clean them a bit if needed, and check for spark on the spark plug wire ends with engine cranking. Buy an inexpensive spark tester, or hold each spark plug wire metal end terminal 1/4 inch from a ground on the engine block, while cranking the engine. Wear a heavy glove to avoid getting shocked. Check that every cylinder is getting a strong blue spark to eliminate ignition as a problem. A weak, yellow or orange spark is an ignition problem, possibly a bad coil, or other ignition part.

If spark and gas is good, you may need to check engine compression. Any cylinder that has significantly lower compression than the other cylinders will cause a misfire, and set a misfire code. You should check for any trouble codes in the engine computer. A code reader or scanner would have to be connected to the diagnostic connector under the dash. What is "significantly lower" compression? About 15-20% less compression. Say you checked and had 150 psi compression in most cylinders. If one had 20% lower compression ( 150 X 20%= 30 psi, 150 -30 =120 psi, or same as saying 150 X 80%= 120 psi.), a condition like that can cause a misfire. I hope I have made sense here. Good luck, and post back what you find, or if any questions.

Apr 10, 2014 | 1998 Ford Windstar

1 Answer

No start has spark injector pulse, fuel, no codes


did you fix this yet, old post.
which engine, we cant guess that. ever.? (we know it's not a diesel)
if the engine has spark and fuel
and it dont start:
it's flooding? (spark tips soaked in raw fuel, ) we look at them......
did you try the operators guide trick, cranking with wide open throttle?
this cuts fueling , clearing a flood condition.
spec, is 120 to 150 PSI. 4.0L
or 4.7L?
good spark to ALL cylinders is the correct test, not just 1.
does the timing light show correct timing? cranking? spark timing?
ever do a tuneup, with new spark plugs yet.
If the above is true it will start. or at least on test fuel.

one way to find problems like this , if the spark is good.
is to cut all fuel injections. (i kill the fuel pump, ask how.)
and start car with test fuel, if it runs for 3 seconds each try.
then all is good , engine and spark, if not , not.
a simple test. that is. and works on all gas engines.

watch scotty.
http://www.youtube.com/watch?v=064Ilsz8Fzg&NR=1&feature=fvwp

in this case he assumes the engine is good. and timed right.

FSM
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

I can run any engine, with no fuel in car. sure can.
and is safe to do.
use CRC.
http://www.crcindustries.com/ei/product_detail.aspx?id=05671

Feb 07, 2014 | 2000 Jeep Grand Cherokee Laredo

1 Answer

It won't start. I put in fresh fuel, carb is good get's air & fuel but will not start. what could this be?


Three main things are needed for all small engines to run: Compression, spark, and fuel. I would purchase a compression tester and a spark tester from a local auto parts store. Both are reasonably priced and easy to use. Compression tester screws into spark plug threads, then you simply pull starter rope a few times until needle on gauge stops rising and observe reading. You should have at least 60 psi and should hold awhile. Next, screw in spark plug and hook up spark tester inline, pull handle and observe spark tester. Next, check for obstructions in fuel lines to carb.These simple steps will lead you in the right direction instead of guessing. Good luck. Keep me posted with results and I can help you further.

Sep 28, 2013 | Champion Fulfillment Champion 2000 Watt...

2 Answers

What is the psi compression on a 1998 kia sportage supose to be?


contact the parts store for specs they should have it on the computer system under overhaul specs..ask for a printout of rebuild proceedures..

Jan 19, 2013 | 1998 Kia Sportage

1 Answer

Tanaka TBC 160- very hard to start, any suggestions for possible reasons? Replaced the gas mix but it starts up & then stops running. tried new gas mix, checked throttle- seems to operate, Any...


hi there

paul 46 here.

all being well and compression and spark and timming , muffler is clear , carby is clean , and diaphrams are all ok , fresh mix , and fuel filter and lines are good

does the unit run with 2 stroke mix in the plug hole - ?
if yes assume compression and spark are ok,, if no check compression and spark and muffler

will the unit run with 2 stroke mix sprayed into the carby throat ?

if it does sounds like you have a air leak somewhere in the intake system

could be at barrel base gasket, c/case joint, manifold boot/ block gasket, carby gasket , impulse hose ,if this unit has one , c/case main seals leaking

2 strokes need air tight c/cases in order to pump fuel / air / oil mixture from c/case to cylinder
and to create a vacuum for entry of fuel/ air / oil mix from carb to c/case

symptoms of air leak are -: hard to start, wont idle, stalling, low power, inconsistant idle, over rev
overheat

pressure and vacuum testing can be done by blocking off intake and exhaust with rubber and metal plates , then fitting adapter to spark plug hole , and placing piston at bdc , pressureise cylinder to 7 to 8 psi of pressure and check areas , base gasket, manifold joint, main seals, , impulse hose ? for leaks with soapy water - if leaking bubbles will be evident

if no leaks and pressure is held at 7 psi for at least 2 minutes with dropping - presure test is good
next do the same test using vaccuum again go to 20 - 30 inch / vaccuum

if vaccuum held unit is ok

suggest take a good look at carby particularly if P and V test are good and spark coil tests good with a coil load test using a spark gap of 6.00 mm to stress the coil ( simulates spark under compression load)

have a look and let me know what you find

cheers pauly46

Apr 30, 2011 | Tanaka Commercial Grade "Inspire" Design...

1 Answer

98 windstar, 3.0 v6. shakes when in park, D,R etc. up to 30 moh ish. checked motor mounts, compression. balence bar turns, crank sensory mod., flex plate not cracked, master air flow sensor, cam sensor,...


SOUND LIKE WEAK FUEL PUMP.YOUR VECHICLE IS SURGING WHEN FUEL PUMP GOING BAD.REPLACE FUEL FILTER.CHECK FUEL PRESSURE SHOULD BE 35 - 45 PSI WITH KEY ON ENGINE OFF.IF FUEL SYSTEM OKAY. YOU COULD HAVE BAD SPARK PLUGS AND WIRES.

Dec 04, 2010 | 1998 Ford Windstar

1 Answer

Engine will turn over bun wont run occasionally backfires through exhaust & carburetors


If it has ever been sitting for a long period of time (a year, or more) then you will need to have the carburetors disassembled and cleaned.
If that's not the case, then verify that the engine has enough compression to run. Each cylinder need to produce at least 140 psi of compression. If the compression is good, look at the spark plugs. Are they wet with fuel or oil fouled? If so, replace them.
Assuming the above items are okay, the backfiring should then be considered a symptom of incorrect ignition timing (faulty ignition system), or incorrect cam timing (major engine work needed). Or something really basic, like plug wires connected to the wrong spark plugs.

Nov 22, 2009 | 1993 Honda CBR 600 F(2)P

1 Answer

My weedeater want start change spark plug


I would have a cylinder compression done on the engine before spending any more money. It may be below 100 psi and will not run. Plus if your fuel mixture is over 30 days old I would mix up some fresh fuel mixture.
Or the diaphragm in the carburetor has become stiff and is not pumping any fuel.
Good Day.

Oct 12, 2009 | Poulan WeedEater Hedge Trimmer 25cc Engine

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