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Why do you have no compression when trying to start your bike?

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2011-11-13 02:12:15
2011-11-13 02:12:15

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 ;)
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No compression could be various things from your piston to your crank start with your piston by doing a compression test

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The engine needs fuel, compression and spark to run. You are missing one of those.

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The compression ratio for this bike is 9.3:1.

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Mixture, compression, and ignition... at least one of those things is lacking.

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it shouldn't take 30 minutes, it sounds like there might be another problem with the bike

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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.

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If it is new because the bike has full compression if it is old its good because it still has good comperssion

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It needs fuel, compression and spark to start and run. You're missing one of those.

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when does dirt bike racing start

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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

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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.

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A detailed answer would depend upon what state you're living in/want to title the bike in. You can get some basic information, to start, here: http:/search.dmv.org/dmv/motorcycle-title

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First make sure the bike is in neutral and push kick start down on right side of the bike.

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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.

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1)compression 2)tension 3)friction

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Does it have: fuel, spark, compression?

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Check the compression. If it has low compression it will always be difficult to start. I have the same bike. It is a really good starter, comparatively to other older 'cycles I own. 1) Check the fuel level in the tank, and be sure to turn the fuel switch (left side of bike below tank and seat) to "On", or even "Reserve" 2) In stock tuning, my bike likes full choke for cold start, in any ambient temperature, it likes to warm up with the choke on, until it starts to sputter from the rich mixture. 3) I believe this bike has vacuume tube that goes to the fuel petcock, this shuts off fuel to carbs when bike is not running. Thus if the bike has not run in a while, or the carbs drained, it will take several start attempts to get the carb float bowls filled. 4) This bike is hard to start if the battery is old or marginally charged. 5) Also pull the spark plugs, if they are brown, or black, change them. 6) check the air cleaner, if it is too dirty it will essentially act like a choke

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My daughters mini bike with a 3hp Briggs has 80psi compression and runs great. A motor I got "running" off eBay has 55psi compression, runs but has NO power. -Jason

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go to a bike shop and start to build it there start with the frame its the most expensive

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I normally wore a Bike jock without the cup, but sometimes my baseball compression shorts.

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Becuse of the motor the belt spins and its pumping sence its starting up its kinda like how a bike starts you have to make a sound on getting on and start pettaling.

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No, The compression test is done as the starter cranks the engine


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