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Bike wont start

Recently installed a new piston rings cylinder and valves...retimed plus cleaned carb and still wont start...can someone help?

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What state are the spark plugs in, double check positioning for timing

Posted on Jan 21, 2013

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Posted on Jan 02, 2017

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SOURCE: mass flooding piston cylinder

This sounds to me like a carb float being stuck open. Turn off the gas and drain the carb. Next, turn the gas back on and sharply tap the float bowl with the plastic handle of a screwdriver as the fuel bowl refills. The goal here is to vibrate the float to free it up. If doing this process a couple of times does not free the float I would remove the carb and clean it with a spray carb cleaner. Be sure main jet and float needle are clear. Clean the air filter then re-mount carb. Next Remove the water trap bowl at the bottom of the petcock, (gas valve). Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).
Install an inline fuel filter. Turn the gas on, wait a moment for the float bowl to fill with gas then give it a try.

Please rate this solution. Thanks!

Posted on Mar 29, 2009

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SOURCE: 1995 honda cbr f3 wont start

I would think about investing in a carb re-build kit.

Posted on Dec 22, 2008

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SOURCE: I have a 125 kaw kx 2 stroke good power on low end

Pull the slide out and then move the clip on the jet needle one notch lower. Also try two notches to see which helps most. This will richen the mix in mid-range.

Pleas rate thia answer. Thanks v222407! :)

Posted on Apr 15, 2009

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SOURCE: how much is my yz 125 worth?

the retail value in good condition is approx $1,500. meaning it looks good, runs good, good tires, breaks,chain and sprokets. but with the extras you have and the after market up grades, i would start with a little higher price.

Posted on May 21, 2009

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SOURCE: I,m getting fire and gas its in time hits but wont start

I had a simular problem with my 88 xr. It started out just running bad at higher speeds which had me thinking it was a carb or plug problem. I started changing plugs and had varing results which still had me guessing. So I started adjusting and jetting the carb. Still the same varing results. I suspected the CDI box so I tried to get one. (I live in Thailand, not the easiest thing.) The parts places produced several boxes that plugger in but gave me the results you just described. Good spark but no start, I also got one box that started the bike real good but would not accelerate. There is a built in timing in those CDI boxes. Just thought you might check this, By the way the original box of mine eventually failed completely and I was correct in my suspicions. I found a used one and it runs great.

Posted on Jul 09, 2009

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Pulsar 220 Bike emits little smoke even after Rebuild, how do I fix?


Did you clean the bore REALLY REALLY good with hot soapy water and a brush before assembly? Need to remove all the grit from the honing process. Test by rubbing hard with a white cloth.It MUST still be white after rubbing. If not then clean it again. It will wear out the rings quickly if it's not right. Solvent will not clean it properly.

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New valves, valve guides, valve guide seals; all fine but probably not needed. When the piston was changed, did you run a cylinder hone in the bore to check for distorted cylinder walls? Was the old piston seized up at any time? Were there scratches or grooves cut into the cylinder wall from being seized? Did the new piston get new rings? Chances are you will need to have the cylinder bored then install a new 1st oversize piston and rings. Please rate my answer.

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I have a Suzuki DRZ 125L and for some reason there is a massive amount of fuel in my crankcase when I changed the oil and it wont idel, but runs fine when started. The carbs have recently been cleaned. Any...


Always turn the fuel petcock off when your not riding the bike.The cocks leak and the fuel flows through the carb. through the intake, into the cylinder, past the rings and into the crank. This is possible death to your top end. The fuel washes away the oil on the cylinder wall !
I would do an oil change then let the bike run for a little while then do another oil change.This will help get the fuel out of the crank.Then another change after your next ride.I would even put a little extra oil with your fuel mix to help lube that cylinder and maybe smootout the idle. Dont run the bike to hard for a while,let the oil clean up the cylinder.(I hope) You may have scorched the piston and cylinder walls with the fuel in the oil.

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The idle problem is a lean fuel mix caused by an air leak in the intake system. Bad gaskets /seals on the intake manifold, bad valves, bad piston rings, loose spark plugs, and bad head gasket are all things that can lean the fuel/air mix. The smoke indicates a need for new rings. I would have the cylinders bored then install new pistons and rings. Now finish the top end work by getting a valve job. You should get a liquid fuel tank liner to eliminate any rust problems in the future. Also, install an in-line fuel filter. Google “ kreem fuel tank liner “ or go to www.http://www.4secondsflat.com/Fuel_Tank_Sealer.html


My complements on the well cleaned carbs. Do the work mentioned above an you will effectively have a new engine.

A “very helpful” rating for this answer? Thanks!


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3 Answers

Cbr250rr 1990 model won't start


Guess I should post my answer as a solution so you can rate the solution. Clarifications can't be rated. Any results yet? The timing should be okay. Sitting for two years will not change it. Pull all the plugs and give a shot of WD40 into each cylinder while pushing the starter button. This will get some lubrication to the cylinder walls and piston rings. It will also help the rings to seal up. Now do the compression check. The readings should be within 10 psi of the top reading. If using aerostart, spray it into the air cleaner not the carbs. The air cleaner will greatly lessen the chances of a fire caused by an engine backfire. Always have a fire extinguisher on hand when messing with the carbs.

Bear in mind that some of the rings may be stuck in the piston grooves and will not be free to spring outward to seal against the cylinder wall. The WD40 may help here also. The worst case is that you will need to pull the head and cylinder to physically free the rings. Your pike is now 19 years old and the valves have probably never been worked on. Now would be the time to re-seat the valves. Depending on the condition of the cylinder, piston and rings, you may want to re-bore the cylinder and mount new piston and rings. At least run a cylinder hone through each cylinder.

I was going to just post this as a "clarification" but have sort of gotten into it now. All I ask is a "Helpfull" rating The "Thanks for trying" rating is a real bummer for a guy just trying to help. Get back to me.
Not sure what manual you have but compression is never checked at anything above idle. Crank and idle speed compression should be 140 to 160 psi.

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1 Answer

Mass flooding piston cylinder


This sounds to me like a carb float being stuck open. Turn off the gas and drain the carb. Next, turn the gas back on and sharply tap the float bowl with the plastic handle of a screwdriver as the fuel bowl refills. The goal here is to vibrate the float to free it up. If doing this process a couple of times does not free the float I would remove the carb and clean it with a spray carb cleaner. Be sure main jet and float needle are clear. Clean the air filter then re-mount carb. Next Remove the water trap bowl at the bottom of the petcock, (gas valve). Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).
Install an inline fuel filter. Turn the gas on, wait a moment for the float bowl to fill with gas then give it a try.

Please rate this solution. Thanks!

Mar 28, 2009 | 2003 Suzuki RM 125

1 Answer

I have a 89 suzuki gsxr 750,it fires but will not run for very long,i have cleaned carbs,checked spark,clean fuel filter in tank.any ideas?


Clean the air filter and, if you have one, remove the water trap bowl on the fuel petcock and clean it. How good is the battery? Install new STOCK plugs. Bear in mind it may be time for carb kits. Other than your cleaning the carbs, the carb kits and balancing and synchronizing of the carbs are best left for the shop to do.

Check the exhaust pipes. If there is a restriction in the burned gases exiting the tailpipe then the bike will not run right, will loose power and even die if too much back pressure builds up. Disconnect the exhaust system and tick off the neighbors with a quick ride around the block without a muffler. If the engine still dies then exhaust is not likely to be the problem.

Check the compression on all cylinders. Depending on the compression, the bike may be ready for a valve job. If you pull the head for the valve job then you might as well consider re-boring the cylinders and install new pistons and rings. Bear in mind, doing a valve job and / or pistons is not recommended for the novice. The good part is that when the work is finished you will effectively have a new engine.

Please rate this solution as "FixYa" if I have answered your questions. Thanks!

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2 Answers

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