Question about RTO Quads 125cc Full Size Adult 4 Wheelers ATV

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Why does my 250cc quadrunner have no compression with a new top end?

Set the timing at least I think I did but it has no compression why?

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Adj valves ? prolly why!

Posted on Jul 17, 2014

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Posted on Jan 02, 2017

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SOURCE: 4 wheeler 250cc no compression

it needs a set of rings and maybe a piston then it will be like new again

Posted on Oct 03, 2009

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1 Answer

1994 suzuki quadrunner lt f250 wont run


Hey Marty,
An internal combustion engine requires three things to run..(if all the internals are good)..
1. A properly timed spark.
2. Adequate compression (>120psi).
3. Proper air/fuel mixture.

Start by eliminating one of these at a time...(get a professional to clean and set the carb), install a new spark plug. Get a new fuel line.

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How to set my timing on my 2012 Arctic cat 425i


Spark timing or valve timing.

Spark time is fixed and controlled by the crank trigger. There is only two things that can change spark timing. a twisted crank ( very rare ) a sheared flywheel key (Also very rare)

Valve timing, remove the timing inspection plug and the the pull start housing, you will use the nut on the crankshaft under the pull start to turn the crank to bring the timing mark TDC-COMPRESSION STROKE - into the timing inspection hole. remove the spark plug so your not fighting engine compression to turn the motor.

Now remove the the valve cover and check the alignment line on the cam. the alignment line should be level with the top of the edges of the cylinder. if not you have a problem

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1 Answer

Yamaha yfz 450r atv 2012 model start but don't have power to ride.


Hey Brighette
Its time to check a few things.. First - remove the air filter and see if it runs ok then... if not... have the carburetor professionally cleaned and set... does it run ok now? .. have you installed a new spark plug? .. do that.. if it is still not running ok.. time to check the compression using a compression gauge that screws into the spark plug hole...

Innova Compression Tester

Your engine should pump at LEAST 120PSI. Once you have screwed the gauge in and lightly seated the o-ring.. turn the engine over for at least 5-8 seconds with the throttle WIDE OPEN... 120psi. minimum... if you are not getting very very close to this.... its time to find out why??... it might be that the valves are too tight... but find out why?... this is probably the reason it won't run..

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1 Answer

Mule 3010 has no power. in low or high it goes maybe 9 mph, has new pump, spark plugs, checked the vents, nothing is helping


What is the compression? This leads me to think you may have more of an internal issue.

Have the compression checked, with throttle wide open, then repost with the results.

May 20, 2017 | kawasaki 2005 Mule 3010 4x4

1 Answer

Loss of compression good fuel and spark


engine dead? has the cambelt /timing chain snapped?
has the engine run out of oil.

I am assuming you checked the compression with a compression tester

Has the head gasket blown or the head cracked.
If you have no or low compression tested with a compression tester the unit has serious or terminal issues.



check timing first....belt or chain I mean, really would not do anything like attempt to start it until I had adcertained whether the camshaft driver is intact or not

Aug 01, 2015 | ATVs

1 Answer

Over heated from blown fan fuse, checked compression, now no spark.


well as you probably know there is NO "test" to check the CDI=buying one and swapping it! I'm thinking it's your flywheel due to the weight(s) falling off and depending how much damage has been done inside this side cover u may need a stator and new gasket for the cover. Good luck Tom

Nov 04, 2014 | Arctic Cat 2006 400 4x4 Automatic TRV

2 Answers

Why does my 250cc suzuki quad have no compression with a new top end?


If its a 2 stoke,"takes gas oil mix", piston in backwards,, ,,,,if its a 4 stroke "takes gas only"...rocker arms need adjusted, or cam not set in proper place during resembly "out of time". Or a. Bent valve/valves,,,in the head, valve will have to be replaced

May 06, 2014 | RTO Quads 125cc Full Size Adult 4 Wheelers...

2 Answers

Have put new fuel pump on ,cleaned carb,new plug, gets gas plug fires but won't start, checked compression at98# don't know what else to do .


The battery voltage on a Suzuki I had would drop low enough during cranking with the electric starter motor not allowing the spark to be strong enough to run, the voltage regulator also didn't function correctly once and as the battery voltage dropped during operation engine would start to bog down and cut out due to low voltage for the ignition system.

Jul 18, 2013 | ATVs

1 Answer

I have a '93 350L trail Boss its got great spark and plenty of fuel and compression is 135 but it will not start. I have tried everything I can think of. Timing resetting carb checked all wiring put in new...


Yeah got this problem many times . Check your Flywheel sitting on a key on the cranck . Most times the key is cutted and the flywheel shifted some millimeters or more . than the engine don't want to start anymore , because the fire timing is out .

Sep 04, 2017 | ATVs

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