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yamaha bear tracker 250 has spark fuel and compression but wont start

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Old 11-10-2018, 01:34 PM
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Default yamaha bear tracker 250 has spark fuel and compression but wont start

i have 99 yamaha bear tracker 250 that is not starting. has new carb new battery new starter new magneto and new coil and plug. i have set the valves to manufacture specs but i cant get it to start
 
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Old 11-10-2018, 02:03 PM
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OEM carb?

is the plug dry after trying to start? If so, did you drip some fuel in the cylinder and try it again?

Did you check the fuel level in carb?

Is the intake/filter clear?


 
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Old 11-10-2018, 02:05 PM
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yes its an OEM carb. the plug seems to be a bit wet after trying to start it. no i have not checked the carb fuel level. and yes the intake is clear
 
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Old 11-10-2018, 02:39 PM
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Have good spark when you hold plug to cylinder and crank engine? If in doubt, try a new plug.
 
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Old 11-10-2018, 02:49 PM
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it has a blueish consistent spark ive checked with a spark tester as well. ive tried 2 new plugs but cant get it to start
 
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Old 11-10-2018, 02:54 PM
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ive checked the fuel in the bowl and the bowl is full
 
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Old 11-11-2018, 07:47 AM
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Check the compression.
 
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Old 11-11-2018, 08:20 AM
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turn your gas off and do a compression test at least with your finger over the hole. generally if it blows your finger off hard it is good. drain the bowl on the carb next. keep the plug out and turn it over with the fuel off to clean out the cylinder. Install the plug and wire. Than turn the gas on just long enough to fill the bowl. Than turn the gas off. Try starting it that way. Maybe use a little shot of starting fluid as you turn it over. I have had new carbs and rebuilt carbs that the needle sticks and than it backflows into the cylinder and floods it out. if it starts that might be your issue. Make sure your choke cable or lever is in all the way also that will flood it out bad too. If it starts with just the bowl full and gas off just play with the gas shut off on it to keep it running. if it stalls out on you after you turn the gas on and leave it on the needle is dirty. Is your tank clean? Is there an inline filter?
 
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Old 11-11-2018, 11:38 PM
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it has good compression because it blows my finger off. ive tried starting it acouple times with the plug off to clean the cylinder. the carb is brand new i just installed it. and yes the tank is clean with fresh gas and the inline filter is new as well
.
 
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Old 11-20-2018, 01:27 PM
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If you still haven't gotten it started take the advice above and spray a quick shot of starting fluid right into the cylinder through the spark plug hole. Screw the spark plug back on quickly, attach the spark plug boot to the spark plug and try and start it. If it doesn't fire like its going to start then you most likely have a compression problem. These engines call for at least 110 psi. I would check with a compression tester if it doesn't show signs of life with starter fluid.
 


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