Question about Kymco 2012 UXV 500i IRS 4x4 SE

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How do i fix the compression release

Engine stops running & will not restart unless i remove top cover on engine & turn the compression release that is stuck on the rocker arm, then it will run but it keeps doing this

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Same problem then the machine would only go 15 km i needed new rocker arms an camshafts 850 from the dealer a buddy installed for 150 cuz he is great guy lol but problems was solved

Posted on Aug 31, 2018

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Adjust it

Posted on Mar 15, 2016

Testimonial: "there is no adjustment, it operates directly off the cam assy. it is an automatic realease"

  • L Pfaff
    L Pfaff Mar 15, 2016

    Remove and replace worn part, if no adjustment.

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Posted on Jan 02, 2017

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Bought a non running 96 polaris 300c atv guy rebuilt engine and installed rings wrong broke piston on start up,repaired broken parts ,had running,sluggish,hard starting,rode it a couple times after start...


Sounds like the person who tried to repair it did not know what he was doing. I would take it to a person who has experience in these things.

Jun 07, 2018 | ATVs

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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

Aug 14, 2017 | ATVs

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..

Aug 12, 2017 | ATVs

1 Answer

1986 TRX 250 R has no compression, probably not rings or gaskets cuz there'd be some compression still !! Any ideas ??


A cylinder efficiency test would be the quick answer. Set the engine to top dead centre on the compression stroke if it is a 4-stroke or any top dead centre if it is two stroke. Lock the crankshaft or engage high gear and apply the brakes to prevent the engine rotating during the test (locking the crank is better). Jam the throttle open and remove the air filter.
Remove the spark plug and fit a commercially available adapter or a modified spark plug which allows compressed air to be fed into the cylinder without leaking.

Once the cylinder is fed with compressed air, leaks through the induction indicates a faulty inlet valve or seat, air escaping through the exhaust indicates similar problems with the exhaust valve or seat and more than the usual dribble of air escaping through the piston ring gaps indicates problems with the piston, rings or cylinder bore.

This type of test is quick and reliable and far superior to wet-and-dry compression testing but the diagnosis is slightly different for a 2-stroke as there are no valves but the process is quite intuitive and a valuable aid to fault finding but stick to low pressure on these engines..

Mar 14, 2015 | ATVs

1 Answer

Have a 2011 polaris 6x6 800 that overheats every time I use it. The coolant will come out the over flow.


The most common causes of a water cooled engine overheating are (1) poor circulation of cooling fluid (bad water pump or stopped up radiator); or (2) inadequate air flow cooling (bad cooling fan); or (3) compression gases entering the cooling system (leaking head gasket or cracked block or head). The first check is to see if air is in the cooling fluid (small bubbles appearing in top of radiator or coolant reserve tank). If so, then #3 is the problem. The second check is to see if the cooling fan (s) is running properly (can feel air flow on output side?). If not check wiring and/or replace fan (#2). The last step is to drain the radiator and engine (turn over engine to allow water pump to empty the block). If additional cooling fluid does not drain out the radiator drain port, the water pump is defective. If the water pump does empty the block, then flush the system with a good flushing agent. Follow instructions on flushing agent bottle. Drain out the flushing agent and re-fill radiator and block with clear water. Run engine as per instructions on flush agent bottle. Drain system again and re-fill with antifreeze (50%) and water (50%). If vehicle is located in a very cold climate, then increase the antifreeze % up to 75% (25% water). Remember, not only does antifreeze help to keep water from freezing, but it also helps to increase cooling ability.

Feb 06, 2015 | Polaris 2011 Ranger 800 6x6

1 Answer

99kawasakiprarie300valveadjustment


MOVE EACH CYLINDER TO TOP DEAD CENTER OF COMPRESSION STROKE ( sorry caps on .) check that timing mark in timing cover hole is in line .remove adj cover per cylinder in alignment and adj valves according to mfg specs. to adj : under adj cover , loosen lock nut on top then loosen adj nut on btm @ top of valves . insert feeler gauge under rocker and adj ,this is tricky to say the least. usually takes several tries to get it right, keep trying the valves must be set right or major expenses can be expected to occur. intake and exhaust settings are different normally at least .005 .be sure to tighten locknut on top before checking if clearance is correct. holding the btm nut while turning the locking nut is the tricky part 4 me anyway. 2 valves per cyl. on most atv eng. adj all valves .start eng and listen to eng w/o reving up. any ticking noise and you get to start over. should be smooth idling and quiet. no popping or backfiring. smooth starting and off w/o run on. should not be performed unless you are familiar with the procedure. contact me or service center near you if not sure on procedure.correct adj. is slightly snug fit . valves making no noise when done .

Jul 12, 2014 | ATVs

1 Answer

Atv troubleshooting


3 things you need to check
1. spark (blue or white good) (orang or yellow bad)
2. fuel
3. compression

Jan 18, 2014 | ATVs

1 Answer

Atv starts and runs but has no power


I haven't done much with atvs but check your compression by removing the spark plug(s) and the hole where they go hold your finger over it and hit the start button and there should be enough force to shoot your finger out and it should make a put put put sound, if there is little force that means you have low compression and its kinda hard to fix, test your compression and tell me what happens

Aug 07, 2013 | ATVs

3 Answers

99 Polaris Sportsman 335, idles fine but when you give it gas it sounds like it bogging out. We have replaced plug and needle and seat. Runs even worse with the air cleaner on. Help


It sounds like the camshaft is going flat. The exhaust lobe on the camshaft is the first to wear. Basically the exhaust isn't opening the entire duration it needs to expel the exhaust. This will cause the bogging issue. Polaris uses an overhead camshaft, which fortunately, makes it easier to replace. To check the camshaft:
1. Remove spark plug
2. Remove the large bolt on top of the recoil starter
3. Rotate the engine with the pull rope until the "T" mark on the flywheel is visible through the hole the bolt was removed from
4. Remove 8 screws on valve cover, fuel tank removal is not necessary but gives you more room
5. Remove 4 bolts from rocker arms, lift rocker arms off camshaft
6. Rotate engine again with pull rope to inspect camshaft. The center of the camshaft is the exhaust lobe, intake lobes are on the outsides of cam. The exhaust lobe should be about the same height as the intake lobes, and will be noticeably flat
To replace the camshaft:
1. Remove camshaft gear access cover on right side of engine
2. Rotate engine again until the "T" mark on flywheel is visible, 2 dots on the camshaft gear should be at the top of the gear and will be parallel to the mating surface of the valve cover
3. Locate the chain tensioner, 2 small bolts holding tensioner to cylinder and 1 large bolt in the center. Remove the large center bolt to remove tension. There will be a spring and pin inside tensioner so be careful not to let it fly out.
4. Remove screws holding gear to camshaft, leave the gear on the chain
5. On the left side of the engine, clamp the coolant hose going into the thermostat cover
6. Remove thermostat cover, some coolant will come out but is ok
7. There will be a round cover on left side of engine with 3 screws, remove that cover and pull the camshaft out through that hole.
8. Install new camshaft, make sure the automatic decompression lever does not come out while handling. Keep pressure on decompression lever and hold cam so that the little ball inside the cam is facing downwards, this will help to keep the lever inside the cam
9. Install cover on the left side
10. Install cam gear on camshaft
11. Remove exhaust rocker arm from the shaft and replace with a new exhaust rocker arm
12. Install spring, pin, and bolt in tensioner once the gear is in place
13. Install rocker arms, set valve clearance to .006 in for intake and exhaust
14. Reinstall covers and thermostat cover
15. Option B is to take it to a Polaris dealer to avoid the hassle of trying to do it yourself!
Hope this helps, if you need any more assistance let me know, Daniel

Oct 04, 2011 | Polaris ATV

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