Question about 2001 kawasaki KLX 300

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2001 lakota sport,the problem started with a scored piston. this got bored 10 over. the timing is correct and the vales are good 165 on compression and it passes a leak down test. the complete ingition sysetm is new.the valves are set correct and the carburator is also good.this will start right up and when the rpm is raised it back fires this seems like a timing issue but the timing marks all check correct.

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Does this model use a chain tensioner? a spring riding on the chain? it maybe broken. you have too much play in the timing chain

Posted on Mar 11, 2009

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2009 Aprilia SR 50R factory I put new pistion,rings gaskets and cylinder will not start only have 65 LBS of compression whats up this motor


65 lb compression doesn't sound very much but could be fairly normal on a fairly highly tuned 2-stroke at kickstart speed, especially if the piston, rings and bore are dry.

Exhaust tuning causes a 2-stroke engine to grow in capacity when it is "on the pipe" resulting in a sudden increase in compression ratio and pressure and so if this is not to cause devastating detonation the designer must make allowances and probably utilise electronic automatice timing retard. Starting with a lower compression ratio is another method.
Having said that I would have expected at least 100 psi pressure and probably a little more...

Assuming you checked the new cylinder thoroughly before fitting and ensured all the ports including the transfer ports are open and correctly line up with any ports or recesses in the crankcase and ditto with the base gasket...
Assuming you checked the piston size matched the new cylinder and the piston rings were correctly gapped prior to fitting...

These things should not be taken for granted and should be checked to ensure they are correct. Assuming you did these things and assembled everything correctly (especially getting the piston the right way around) with a smear of clean oil a good induction should be assured and the compression should be almost as good as it is ever going to be.

I suggest you ensure there is a good spark and fuel is reaching the cylinder. If it isn't I suggest you revisit the new parts you fitted and the way you fitted them before investigating anything else.
Good luck!

Sep 23, 2016 | 2009 Aprilia SR 50 R Factory

1 Answer

Can i continue riding with this cylinder which has scuffing on piston skirt side both intake and exhaust. see photo in comment.


Hi, Ronnie piston scuff on the bottom 15mm of the piston skirt is normal I would not pull the top end apart unless your compression falls below 100 PSI or your oil consumption is more than 1 litre per 1500 KM for more information about your question and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
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Mar 19, 2016 | 2006 Hero Honda Karizma

1 Answer

How do I take seat off my 2001 kawaski Lakota


Hi Jerimy, I am sorry you can't find the first and best tool you ever bought for your Kawasaki but despair not for a mere $10 you can download another one. For more information about your issue, please visit the websites below. Good luck and have a nice day.
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Nov 08, 2015 | Motorcycles

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I need a wiring diagram for a 2001 Kawasaki Lakota sport


Hi Richard, I am sorry you can't find the first and best tool you ever bought for your Kawasaki but despair not for a mere $15.00 you can download another one. For more information about your issue, please visit the websites below. Good luck and have a nice day.
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Oct 10, 2015 | kawasaki Motorcycles

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Yamaha dt125 won't start


Many piston compression (rather than oil) rings are uni-directional, and need to be installed with the proper side upward. The rings will have a "T" or "TOP" etched on the surface that needs to face upwards.
So my first question is, did you install the rings upside down?

Second, why did you replace the rings?
Did you measure the cylinder bore? Was it oversized, or out of round?
Is the bore worn enough that the piston is now too loose a fit?
Did you get the correct size rings? If you bored the cylinder, did you get the proper oversize rings?

Nov 20, 2013 | Yamaha Motorcycles

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02 yz 250 not reving up


Check the compression. It should have at least 100 psi,..if not,then its time to rebuild the top end..IE piston,rings,bore cylinder. If compression checks out,i would start with the power valve. Two stroke dirtbikes power valves are notorius for gumming up and sticking,causing them to not rev correctly.

Aug 31, 2012 | 2003 Yamaha YZ 250

1 Answer

How do you check the timing and adjust the carb. My problem is every time I try to start my 75 yamaha 400 endro it will kick over but won't run I have spark and it wants to go and sounds like it will...


Hi, is this still on points ignition? The spark should occure between .5 and 1 mm before top dead centre, on some of the older machines the ignition timeing is not addjustable as the backing plate is fixed, however the ignition timeing can be determined by the correct points gap, the points should open at the correct time as the piston reaches the top of the stroke, if you dont have a top dead centre gauge, you could improvise by making some markings on a thin rod which you will insert into the spark plug hole, rotate the engine in the correct direction by hand until the piston is at top dead centre, that is the piston has reached its upermost stroke before it starts to decend, at tdc turn the engine back the required amount untill your markings point out the required amount, it is at this point the points should just sepparate creating a spark, a test light with a small 9volt battery in line will indicate the separation of the points, i would however like to stress the third most important item to make a two stroke run is compression, spark and fuel alone is insufficiant without it, on machines that have been standing for long periods of time the piston rings can become stuck in the piston, not allowing the rings to seal the bore, remove the exhaust and look up the Port the piston should look as new with no scoring to it, any damage will prevent the engine from running, as will worn crankshaft oil seals which can become soft from old fuel contamination

Oct 29, 2011 | 2001 Yamaha SR 400

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I have a 2000 yz 125. Melted a hole in the piston but didnt score cylinder. Replaced top end. Wont start. Has good fire. Crank case oil was a little grey. New plug,fluids,fuel.


I would be checking compression it may not be visible score on cylinder but it does not take much to loose compression on small bore motor with one piston ring and 11 years old

Mar 03, 2011 | 2003 Yamaha YZ 125

3 Answers

Honda cb100 motor sezied can i rebore and fit larger piston and ifso what. Thanks


in adition to the above coment, which i must say is spot on, the posability of a used barel and piston if a new piston is not available could be worth considering, other things you may wish to check on that particular engine is camshaft seizure, in a uk bike it runs directly in the machined surface of the cylinder head, oil failure due to blocked oil filter has severe consequenses, located on the l/h side of the engine under a 22 or 24mm spaner head cap just below the gear change lever, this is a washable filter retained by a cap and spring, correct replacment is inperitive. are you located in UK? HOPE THIS HELPS YOU

Aug 02, 2010 | 1976 Honda CB 100

2 Answers

2002 honda CR125R


sounds like you might have broken a piston ring. Sometimes a small piece will break-off and cause the loss of compression and if you look down the cylinder you wont see it. But it's enough to cause a problem.

Apr 30, 2009 | 2002 Honda CR 125 R

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