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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5hp. brigg horz shaft on a tiller the compresson is 30 pounds on both valves what can i do?To set the valves or is the head gasket is bad?

Head gasket almost never gives trouble and if it does the sound of escaping compression is unmistakable.

The valves might be at fault or it might be the cylinder bore or piston rings.

A wet compression test could prove informative. It doesn't take long to remove the head for a bore check and if no scores are found and there seems nothing obviously wrong with the valves, wipe plenty of oil around the bore, fit the cylinder head and recheck compression.
If there is a significant increase it indicates worn or broken piston rings and if there isn't a significant increase it is likely the valves are the major culprit.

I am not sure what the compression pressure should be but don't expect the high readings of a car engine. 60 - 80 psi maybe...

Apr 20, 2018 | GASKET Garden

1 Answer

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

2 Answers

What is the cause of a sound coming up in engine when driving 120km/h after driving without water. Model 2007,1.4engin

the pistons are starting to bond to the cylinder walls
the rings are starting to break up
the oil ( what is left of it) is boiling off
the big ends and main bearings are starting to fail
the cause of the sound is the engine starting to disintegrate

Oct 15, 2015 | Cars & Trucks

1 Answer

What is the compression readings for a 1979 c10 i6 250

normal compression readings will be in the 150-165 psi range
There is a permissible 10% differences between adjacent pistons
anything below 120 psi is considered worn engine
really low readings on 1 cylinder indicates
broken ring
scored bore
bent valve
burnt valve
loose valve seat insert
low readings between adjacent pistons indicate a head gasket

Mar 17, 2015 | Cars & Trucks

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

1 Answer

Hi, I'm having problems starting my new morrison bc230b weedeater... I think whats happened is the wrong fuel was put in it..(no oil mixed) .is there a quick fix? thanks

hi there


if you have run the unit with no oil in the mix ie straight petrol

you will have damaged the piston / rings / bore - do a compression check - if its quite low
check - remove the muffler and check for score marks on piston and rings and bore
if so , the unit may not be worth repair , because compression will be lost past damaged rings
and with damage on piston more scoring / damage will occur

so answer to is there a quick fix - no especaily if what find when you look up the ex port at piston / rings/bore

have a look

sorry for bad news


May 31, 2011 | Garden

1 Answer

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

1 Answer

Chainsaw (Husqvarna 345e) will not start due to start attempt without adding oil to fuel.

If this was started without oil in fuel, then the piston is likely scored, and the compression rings stuck in a smeared aluminum mess. You can remove the muffler and probably see the damage to the piston. It can probably be repaired though. Take it to a reputible shop, then read the owners manual and get some help to learn how to safely use and maintain your investment that you have in this saw.

Jul 04, 2008 | Husqvarna Husky 165

1 Answer

Piston ring

The piston ring whilst the piston is still in the pot should be relitivly tight. This is because it creates the seal to maintain compression. When the ring is taken off the piston it only has about 4mm gap between the two ends, any more than this it's probaby knackered. worth checking pot and piston for scoring around the exhaust outlet as if it's going to loose compression it will be at this point. If all these are fine check the decompression valve (if you model has one) if this is broken your compression will be ruined.

Oct 24, 2007 | Husqvarna Husky 165

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