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TyroBullmastiff

2012 TRX400X cranking/idle problems-Help Newbie Plea

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  • Hi Everyone,
    We purchased a 2012 TRX400X that was running fine for a couple of days, then starting having problems cranking. We changed the spark plug & it ran great for a day (just playing around our property). Next day it wouldn't crank for anything, tried jumping it, still wouldn't catch. Had battery tested, it was ok. It had about 1/2 tank of gas, so we filled it up. It will now crank, but won't idle without giving it gas. If you let it idle, it will pop once, then turn off. Should we start with the carb? Anyone one know of a step by step guide to this?
    I'm downloading this manual today.....https://www.tradebit.com/filedetail.php/279289626-2005-2014-trx400ex-trx400x-sportrax-service-repair
    Our local shop is backed up for weeks! Any suggestions would be greatly appreciated!
 
 
 

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It sounds like plugged  jets in the  carb to me.   It's not uncommon  if it was sitting  for  a long time with  old gas  in the carb. A disassembly,good cleaning  and fresh gas  should fix  it.

Edited by davefrombc
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Did you check the spark plug? Start there before tearing into the carb. 

If it's black and all soot try burning it off with a lighter, put it back in a crank if it starts fine your mixture is too rich and your fowling the plug.

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