Polaris 300 xpress will not start carb seems clean and i just put new piston and rings was locked up when i got bike. but starts on starting fluid and back fires 3 inches of fire out muffler
Seriously, guydaigle? The 300 Xpress is a two stroke. The problem is too much fuel. Start by checking and adjusting the carb. Look at the needle & seat, then the float level.
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Check the Flywheel key. It should be locked under the pull cord, where the stator is located. I will be a small piece of metal that slides into the spline from the engine and the stator. If it is worn the stator will rotate off the spline and the timing will be off, she won't start and if she does will be really rough and backfire, sputter and have power loss.
Carb, is still plugged or your float is stuck or not adjusted properly.
Check the attached links,Manuals and guides, Good luck with your Bike
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Sounds like a carb issue...make sure you have fresh ,clean gas.You havent got water in your carb/tank have you? I would start by taking the carb apart and give it a really good clean.Check all jets and orifices.Another words,take apart anything in the carb that you can,clean and replace.
First - Did you find ALL the pieces of the broken piston...if not...STOP and FIND them.. they are in the bottom of the crankcase...you engine WILL NOT live long if you have not gotten ALL the pieces--even the TINIEST ones out!! You mat have more damage than just a broken piston.. something caused it to break.. you may have cracked the crankcases...may have damaged the main bearing(YES) and/or damaged the crank bearing.. see if gas in leaking into the transmission oil.
There is an arrow on the piston that faces toward the EXHAUST port. If there are hole(s) in the piston, they go towards the INTAKE.
Do some more searching and repost the results for review!
First question since i am assuming it was just sitting around for some time if i am correct you need to pull the carb remove the float bowl and components if everything was done correctly with your rebuild the likely problem is your carb is gummed up remove everything in the carb low speed jet etc. soak everything in sea foam fuel cleaner overnight and hopefully you have some compressed air and blow out that low speed jet and passage way pay close attention that you have see fluid coming from the other end and check the jet make sure it is unclogged hold it up to the light.
I don't have a trial boss 250 but on most 2stroke engines you should never see the top of the piston through the intake port when the carb is removed as the piston doesn't go low enough, thats by design, its the exhaust side you need to look through to see the piston top(crown), if you remove the exhaust to have a look check the condition of the piston rings while there
Hey Ang,
Just from what you have told us... this seems a little more complicated than simple... Does it only run wide open? ...Has anyone been "working" on this atv...?? IF they have been working on the carb, you may have put the slide in incorrectly...there is a groove down the side of the slide and a pin in the carb the groove runs on...
1. Compression should be 120PSI...or more, with the the throttle held wide open and kicked over 5-8 times.. The carb may need to be professionally cleaned and set...(take it to a qualified professional)...do this and reply to me..
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