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2003 Yamaha FX140 The engine doesn't rev it just doesn't want to go any faster than 24 mph. We changed the gas also and that's when it went from 12 mph to 24 mph but hasn't improved speed since. Starts great and runs fine.2003 Yamaha FX140
The engine doesn't rev it just doesn't want to go any faster than 24 mph. We changed the gas also and that's when it went from 12 mph to 24 mph but hasn't improved speed since. Starts great and runs fine.
If you got to this page and look up your model it will tell you the standard settings for your high and low speed jets. Resetting back to stock settings may perk your boat back up. http://www.shopsbt.com/forum/showthread.php?t=13981
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How old is the fuel? Ethanol causes major problems if left too long. You may need to empty the fuel and clean out the fuel system. Try changing the fuel filter and adding some seafoam to the fuel and running seafoam thru the fuel system. Hopoe this helps.
This is a shot in the dark BUT check to see if there is a wear ring that would sit around the outside of the impeller.Its inside the pump but would be right where the impeller spins.Jet skis have them and I thought yours may also.Hope this helps
Tools(1) A compression gauge (2) a spark gap tester.(3) A Clymer service manual for your engine. (you can purchase from your local dealer. I know all these are expensive but if your going to be a polaris tech you will always need them. Troubleshooting (1) check compression. Look at your Clymer manual for specific psi.all cylinders need to be over 100 lbs and equal each other within 5 lbs.(2) check spark. use a spark gap tester all cylinders should jump a half inch gap. if you have good compression and good spark, fuel is the problem nine times out of ten.Ethanol gas is proven to stay stable in fuel systems for only 30 days in 90 + degree heat. Drain gas tank,clean fuel lines replace and replace all fuel filters. Polaris has a gravity filter under seat, clean it. Finally replace spark plugs, I know spark plugs probably don't look bad but this is a C.D.ignition. Fresh spark plugs means less resistance for the ignition system. The ignition system is week compared to automotive. Test drive polaris, if the problem is still there then there is further steps to take. If your polaris is fuel injected. Pull out your clymer manual. what is great about the Clymer Manual for Novice techs is it gives detailed info on your polaris. Troubleshooting tips and teaches you how your polaris works. If its carburetor then you should clean carburetors. Inside the carbs is another filter that needs to be cleaned. Its not difficult you just make sure you put everything back in proper order. take pictures if you need to.
if the motor is reaching full revs look at the jet assemby for fouling or prop damage. If it is not reaching full revs get authorised mechanic to fix it, it will be cheaper in the long run.
From minor problem to major problem. Try to replace your spark plug wires, rotor cap and the spark plugs, also it can be the injectors, plus if possible, try to replace the fuel filter which is located low under your EFI unit. If problem not solved, then it will probably be your A/T trans.
2003 Yamaha FX140
The engine doesn't rev it just doesn't want to go any faster than 24 mph. We changed the gas also and that's when it went from 12 mph to 24 mph but hasn't improved speed since. Starts great and runs fine.
what kind of ski and does the engine rev like it wants to go but doesnt?
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