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Motor won't start. I have tested for spark , compression and installed a new carb

Compression = 120#

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Check for plugged spark arrestor on the muffler and check flywheel magnet timing to the ignition coil. If they don't line up with piston at TDC (top dead center) then you have sheared flywheel key. On many of the newer 2Cs this key is manufactured as part of the flywheel so the flywheel need replacing if the key is sheared.

Posted on Mar 29, 2015

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No power on john deer gater


Hey Theresa, IF ALL the items you mentioned are RIGHT...Time to run a compression check,, this will require two people.. and a compression gauge that you screw into the spark plug hole. This will give you an indication of the condition of the internal components..(Piston/rings/cylinder walls - valves/seats/clearance)..Do one cylinder at a time... with all spark plugs removed ...You need to REMOVE ALL SPARK PLUGS ANY TIME YOU TEST FOR COMPRESSION - so the engine will not crank!! Install the compression gauge with the correct adapter (match the spark plug thread length).. seat it lightly so you don't distort the o-ring seal.... now - HOLD THE THROTTLE WIDE OPEN and crank for 5-8 seconds.. the gauge should read at least 120 PSI+...( I have seen some engines run fine with as little as 100psi-rare). If every cylinder checks over 120psi.. that should eliminate the piston/ring valves/seats/clearance possibilities. If any of the cylinders show a low compression or a A LARGE difference between them (over 25psi), time to have a qualified professional look at it...Once you have finished this test, and all cylinders show over 120psi..(+-12psi) ... its time to look back at the carb/choke.. have it cleaned and set by a qualified professional!

New Professional Cylinder Compression Tester Test Kit Mechanics Gas Engine...

Please keep me posted, mark as helpful, thanks

Aug 08, 2017 | Garden

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I installed new carb. on my tecumseh 5hp. snow king and it wont start. I have spark and gas is flowing out of carb.


This can be very frustrating and tough on the back and arm.
Always confirm the the fuel tank valve is open and the stop/run switch is in run position

It takes three things to run:
  1. Compression. This is the resistance that you feel as you crank the engine. Some engines have compression release to assist getting the rotation started. You should be able to feel the compression stroke as you rotate, Remove the plug and you can easily tell the deference. If it had, last time used, been running and starting with no problem I would assume that the compression is OK. Gauges are available to check. at lease 120 PSI
  2. Spark. It is near impossible to lose the spark timing on these. It can only be magnitude and presence. If in doubt about the condition of spark plug replace. I usually lay the plug on top of the head with wire attached and observe for the spark. No spark no start.
  3. Confirm that the throttle is in the wide open position. It is possible during the repair the spring or rod has closed the throttle air valve. Air/fuel mixture is always hard to trouble shoot. I use open choke and starter fluid to conform that compression and spark are working. After that I will choke on a cold motor and pull listening for the first fire. At the first fire I would usually half choke and pull to first run. Full choke for many pulls will only flood engine!! If no joy then I would allow engine to vent and go back to start fluid. If it will run on start fluid than either carburetor is messed up or quality of fuel is bad.
If after several tries and fuel is certain to be good remove plug and check for gas. It is possible that the new carb float valve or mixture adjustment screws are messed up.

Jan 10, 2016 | Tecumseh Garden

1 Answer

Aprilia rs 125 won't start!!


right you done quite a bit, so whats left, fuel seems ok .. so ht lead ht cap, spark plugs dont always come with right gap, any leaks with airflow either side of carb, remember the filter often acts as a restrictor too. try the putting a small amount of fuel in cyclinder after cleaning plug, should atleast get a backfire, is choke setup ok, carb mix if not factory sealed is generally 1 and 3/4 turns out from tight,

Feb 13, 2013 | 2005 Aprilia RS 125

1 Answer

Won't start can't even get it to fire got spark getting gas ,don't know.


Check the compression! It has to be around 120 and no less then 100 to fire off. If it is ok, Have your carb checked out. It should fire off with some spray.

Feb 10, 2013 | Poulan Garden

2 Answers

While trying to start the saw the compression is so great that it is near imposible to pull the start rope ....ie won't spin fast enough to start ... new plug ,,,, new gas .....no start ,,,tired arm...


If the carb is flooding it will fill the cylinder with fuel, this will cause a hydralic lock, making it near impossible to crank the engine, remove the spark pluf, turn the ignition off, crank the engine, if fuel pours out of the plug hole then it is well flooded, you will need to get a pressure test on the carb to check the needle is not leaking, this will be the quickest way to check the carb.

Sep 19, 2011 | Poulan 14" Chainsaw

1 Answer

I purchased new byke one month before but its not getting start, i tryed kiker also its take more then 10 times


Make sure you have Spark at the sparkplug and that your sparkplug is in good condition with proper gap.
Makle sure fuel is getting to carbs, by loosesing the carb drain screw - fuel should flow out.
if your getting fuel, tighten the drain screw back and turn the motor over.

make sure key switch is on and on/off switch is on.

if motor doesn't start, spray a very little of carb cleaner spray into air filter box.

if motor starts and dies that means that your carbs are getting gas but the jets are clogged and not allowing fuel to go through the carb, pull your carbs off, disassemble, soak, rinse, blow out with compressed air, make sure you can see through the jets, reassemble and your bike will run.

If your getting fuel through carbs and you have good spark, then pull your spark plugs and do a compession test. You must have at least 100 psi compression, if not your rings are bad, or you have a stuck valve.

If no compression:
You can check and adjust your valve clearance, only when the motor is cold.
Do this and then recheck your compression. If compression comes up. Your motor with run.
If still no compression. Then you must take the top end apart and see why.

Have your head inspected to make sure valves are seating.
Check your piston ring end gap.

You will find it to be one or the other to cause your loss of compression. Fix and repair.Reassemble.

a 2 stroke motor with no compression is usually a blown head gasket.

Dec 11, 2010 | 1989 Honda CBX 250

1 Answer

Bike not starting at all. sometimes it starts after continous kicks but no use .agian the same problem.


I would suggest that you cleanyour carburetors.
To tell if they need cleaned, spray carb clean in the back of the carb and the kick it over, if it starts right up, then you need to clean your carbs., Drain your gas tank and install a new fuel filter, and put new gas in the tank too.

If it doesn't start right up on the carb cleaner, then check to see if you are getting spark.
If you have spark, then test your compression.
Compression should be at least 125-145 psi but not less than 100 psi to run.

If you don't have spark, pull power wire off coil and see if you have power to the coil.
If you do have power then your coil is bad.
if you don't have power, make sure your on/off switch is working. check wires

As long as you have good compression, good fuel and good spark, that motor will start.

Pull out the plugs and see if they are dry, or wet or , black and sooty.
If dry - no fuel
if wet - no fire or misfire
if black and sooty - clean & check gap or replace with new ones.

Nov 30, 2010 | 2006 Hero Honda Passion Plus

1 Answer

What is the Kawasaki kx 125 compression i did test tested 135 with cold motor is this what it shuld be i get real bad bog at low rpm


anything over 120 on compression test is ok. anything under 120 and its time for top end. and for bog you might try cleaning carb.

May 09, 2010 | 2005 kawasaki KX 125

1 Answer

Snapper SS312 weed eater. Cranks when primed but won't run


I am sorry to say this, but the compression for that type of engine should be atleast 120 psi. Remove the muffler and look at the cylinder, it is scarred beyond repair.

Mar 30, 2009 | Garden

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