Question about 2008 Gas Gas EC 300

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Hi, I have a 2006 gas gas ec300 and it has done 90 hours of trail riding. Should I be looking to replace piston and rings? It still starts 1st kick and seems to run perfect. Thanks go the gasser

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Be sure to change the piston and rings sometime around two years from now, but only if you want to. So long as the engine doesn't seize up due to lack of oil in the gas, the piston and rings should last for years. Please rate my answer.

Posted on Sep 16, 2010

Testimonial: "Thanks for your help. I'll be running quality ams oil in the gas, I hear that it is one of the best. Thanks again."


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Yes, the problem is linked to compression getting past the rings. The pressure goes to the gearbox then some oil gets carried out of the box along with the compression. Too much oil in the gearbox makes the problem even worse. You shouldn't need pistons. Chances are the rings are just stuck in the piston ring grooves. Sometimes they can be freed up by the mechanic manipulating them. Often they break when manipulated. It all depends on how badly they are stuck. If a piston is badly scored it needs to be replaced. The scoring can stop the rings from sealing the cylinder. Do this; drain the oil then fill the box to the proper level. Wash the bike to rid it of previous oil spills. Now see if the problem returns after the washing. If the rings are stuck , the bike should be smoking as you start and ride it. Chances are that only the rings will need to be replaced. Any chance you can be there as the mechanic takes the cylinder off? A dishonest shop could bring you a badly scored piston and rings and say they came from your bike when in reality they came from another bike. They free up your rings and charge for new pistons and new rings as if they actually put them in.

Jul 27, 2011 | 2006 kawasaki KX 450 F

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1998 Gas Gas EC 300 power valve rattling

Hi, Hauschild_al for this scenario you will need your service manual, parts fiche, and owners manual if you can't find the best tool you ever bought for your Gas Gas, despair not, for a mere zero $0 you can download another one.
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Nov 15, 2017 | 1998 Gas Gas EC 300

2 Answers

2003 KTM 250 SX won't start. When you kick it, it starts to fire but never turns over. I accidently put the wrong gas in it. It takes 60:1 but I didn't put enough oil in it. It died while I was riding it....

If you have run the engine with too little oil then there is probably damage to the piston / rings & / or bore
Remove the exhaust to have a look

Ride Safe

Jun 03, 2010 | 2003 KTM SX 250

1 Answer

06 kawasaki kx450f pinging

Sounds like a broken piston ring, & now its embedded itself into the piston & / or barrel
Remove exhaust pipe & shine a light up into barrel / piston to inspect !!

Ride safe
Please mark this as very helpful (if it has been!!) - it helps my ratings

May 09, 2010 | 2006 kawasaki KX 450 F

1 Answer

My Polaris Sportsman 90 ATV has 70lbs of compression on the engine is that enough ? It does not start .

70lbs for a 90cc should be good, but 80-85 is better. Compression drops from piston rings wearing out, most of the time. Piston rings wear out from old oil...every time. Rule of Thumb: 5 tanks of gas, change your oil !!! It's not a car !!! A car has 5 quarts of oil which takes about 3 months to break down (2,000 miles or so), 90 cc engine has a half a quart, which takes about 3 weeks to break down (based on everyday use) SO...5 tanks of gas, change your oil..

as for the not starting thing, check for spark (should be a blue spark ONLY, any other, replace plug, orange won't ignite gas) if you haven't been riding for a while, open the drain screw on the bottom the carburetor and drain the water out. Ethanol turns to water when the gas sits too long...

Apr 09, 2010 | Polaris ATV

1 Answer

Kick starter has no compression, will not shift

hi, will the shift lever shift up when the bike is being pushed along, is it stuck in neutral, if its in neutral then push it down make sure it goes into 1st gear then can u get someone to push u whilst holding the clutch in then release the clutch and see if you can jump start the bike that way.

when you push the kick start down is it turning the engine over properly and if so if the compression is really to low then the chances are the piston ring has broke and scored the side of the cylinder if this is the case then you need to get new piston and rings and a new cylinder.

The problem with moto x bikes is they are high power and work at really high temp so parts need changing more often the piston rings need changing every 25 to 35 hours of riding time you need to do this as they ware and brake if used any longer.

you also need to make sure you get the petrol and oil mixture spot on as if its not getting enough oil it will blow the piston and rings so you need to measure exactly the correct mixture.

these bike are expensive to maintain and need new parts on a regular basis so remember this the next time you get the bike running

Mar 01, 2010 | 2005 kawasaki KLX 110

1 Answer

I was recently riding down and enduro trail when i laied my 2003 WR-250F over and when i attempeted to started it, i had little to no compression. When i inspected it i found a fouled spark plug, and so i...

Take out your spark plug, but plug it into the plug-wire. Let the bottom of it dangle against the head and try to kick it. If no spark, problem with that, if it sparks, you may have a cracked head or piston/rings problems. This will at least rule one thing out.

Nov 06, 2009 | 2003 Yamaha WR 250 F

1 Answer

Kdx220r wont start after running great for 2 hours

thinc electrical 1st-its weakest link-inspect wires-specially plug area-fuse-starter--cam chain sproket could hav loosend at cylinder head;keepin ur valves open for damage by piston--may hav water in chamber--take heed to bottom end

Aug 24, 2009 | kawasaki KDX 220 R Motorcycles

1 Answer

Kick start has no compression but runs fine once i get it going

Does it feel like yhe kick is even engaging and turning the crankshaft? Are you full stroking/kicking it over or short stroking it? when cold, are you using the choke. I suggest taking a compression test when it feels as if it hs no compression It could be undersized piston, rings, or a simple. good luck

Jun 12, 2009 | 2004 kawasaki KX 250 F

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