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The first thing I would do after a low compression test is check the valve clearance.
If its a 2 cycle, a burnt piston/ring. 4 cycle may have brunt valves/piston/rings.
AnswerI agree with above but would like to add head gasket or loose spark plug could be a contender as well but less likely then rings or valves, first ensure spark plug is installed correctly and if it is then remove exhaust headers and slowly crank motor past TDC a few times listening for hissing sounds, if not exhaust repeat with the inlet manifold if still not the problem then if capable remove head and check for noticable wear/damage on the sleeve, head gasket(usually diagnosed by looking for carbon deposits starting from the bore shooting out towards the outside of motor) and piston top and also check the piston ring/sleeve gap. imo if you get the head off and you can afford it replace the rings while your there ;)Still curious? Ask our experts.
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What causes no compression in a 2 stroke dirt bike?
No compression could be various things from your piston to your crank start with your piston by doing a compression test
Why wont your quad bike start?
The engine needs fuel, compression and spark to run. You are missing one of those.
My 80cc bike motor takes 30 min of trying to start it to start. how can i start it first try?
it shouldn't take 30 minutes, it sounds like there might be another problem with the bike
What is the compression of Honda XRM 125?
The compression ratio for this bike is 9.3:1.
How can you tell when your dirt bike needs oil?
your dirt wont start because if there is no oil there is no oil compression which will cause your dirt bike to not start Answer Before it gets to that point, perform regular maintenance and oil changes. This will increase the life of your engine.
250 yzf WHY IS IT hard to kick start?
If it is new because the bike has full compression if it is old its good because it still has good comperssion
Why is my 98 Ford V6 trying to start but wont and getting plenty of fuel?
It needs fuel, compression and spark to start and run. You're missing one of those.
If one cylinder head has no compression but the other on does the car should still be able to start?
It might sputter and sound like it is trying.
Why wont my Brand new 49cc dirt bike will not start?
well there are two simple rules about anything motorized. #1......you have to have fire. #2... you have to have fuel. There is also a third rule .....you need compression , but you probally have compression since its brand new
Why does gas mix with oil when trying to start?
This could be that your rings are bad or that it is saturating your cylinder walls and going by the rings can figure this out by getting compression test.
What are the signs of a blown top end on a two stroke dirt bike?
no compression (easy to push kick starter down)
1996suzuki rm125 has fire gets gas.why wont it start?
Have you checked the compression? It's needs to get good compression to detonate. If not compression , then check the fuel mixture screw on the carb. It might be getting to much fuel, when trying to start it, or it might be to lean. just a tip, never use starting fluid on a 2 cycle, it will cause a lean out and sieze the motor up.
