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baja 5t 30.5cc wont start. wont even fire.

Discussion in HPI Baja Engine and Exhaust forum, started by sloppy.

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  #1  
Old 05-02-2011, 02:54 AM
sloppy sloppy is offline
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Unhappy baja 5t 30.5cc wont start. wont even fire.

hey everyone i have a new 5t 30.5cc truck. recently whilst it was warming up i was clipping the shell on and it stalled. ever since it wont start or even fire. i have had the spark checked and it is getting spark. tried new plugs. checked all seals and gaskets. tried a new carby. new filters. crank key is in correctly. tried new fuel. so its getting spark,fuel and air i am at a loss to what it could be. please help!

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Old 05-02-2011, 03:45 AM
dirtyboy dirtyboy is offline
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compresion?
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Old 05-02-2011, 03:49 AM
sloppy sloppy is offline
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yep got compression. had the exhaust off piston and pot looks fine. engine had only done 2 hours work max!
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Old 05-02-2011, 03:57 AM
dirtyboy dirtyboy is offline
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is the flywheel spacing all good?
so the flywheel doesnt touch the coil
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Old 05-02-2011, 04:06 AM
sloppy sloppy is offline
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yep used a business card to set the distance. its got me buggered what it could be. i have had a two stroke motor specialst have a look at it and he cant even work it out. could it be anything to do with the transmitter?
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Old 05-02-2011, 04:08 AM
cybermenace cybermenace is offline
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1 question do you have a kill switch ??

Billy
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Old 05-02-2011, 04:11 AM
sloppy sloppy is offline
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yes but i still have spark. when i hold the button on and pull start it i loose spark so i guess its working right.
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Old 05-02-2011, 04:13 AM
dirtyboy dirtyboy is offline
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can you see that fuel is getting into the cylinder?
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Old 05-02-2011, 04:15 AM
cybermenace cybermenace is offline
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have you tried taking your spark plug out and tipping the baja upside down and pulling the pull start a dozen times?

just in case it flooded if you have been trying to start it and not getting any where you might of flooded it ..

Billy
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Old 05-02-2011, 04:16 AM
sloppy sloppy is offline
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yeah it must because after a bit it does wet the plug.
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Old 05-02-2011, 04:19 AM
dirtyboy dirtyboy is offline
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leave the spark plug out of the motor for about an hour and try again
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Old 05-02-2011, 04:21 AM
cybermenace cybermenace is offline
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+1 give it and hour and give it a good few pulls to clear it out and hopefully that will do it for you..

Billy
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Old 05-02-2011, 04:21 AM
sloppy sloppy is offline
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tried that to mate. left it out overnight.
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Old 05-02-2011, 04:38 AM
Rickshire Rickshire is offline
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Quote:
Originally Posted by sloppy View Post
tried that to mate. left it out overnight.
Have U been running it in the sand ? I ask because I used to run in the sand and my motor did the same thing even though it felt like it had some compression it didnt have all the compression and would not start pulled it apart and the piston did not look bad but it was, I then put a new piston in to try it and boom fired right up and ran great ! Some how some sand got in my motor and messed something up with the piston !
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Old 05-02-2011, 01:12 PM
sloppy sloppy is offline
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hey no i havent. tho i am starting to think its something inside. from what i read they dont normaly have problems with these motors.
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Old 05-02-2011, 01:46 PM
dirtyboy dirtyboy is offline
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pull the head off and put a new ring and base gasket in and if the piston looks bad buy a new one as well
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Old 05-02-2011, 06:52 PM
cris cris is offline
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if you got spark,fuel, and air, the only thing left is compression. try dropping a few frops of oil in the cylinder, try starting it with the choke on, if it pops, take the choke off see if it runs.
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Old 05-02-2011, 07:14 PM
chance chance is offline
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yes, as said above, putting oil in the cylinder is what you need to do. my guess is you are either flooded or your ring, or possibly also the cylinder is shot. anyway, any time you flood an engine all you have to do is pull the plug, put 6 or 8 drops of oil down plug hole, unchoke it, blow off plug or give plug a blast with carb cleaner, reinstall and fire it up. if it is flooded this will get it started everytime, if it is wore out it will fire and run normally till oil is burned out and compression is lost again. good luck

Last edited by chance; 05-02-2011 at 07:19 PM.
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Old 05-02-2011, 07:54 PM
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Just lean the baja up against a wall or a tree so the exhaust port is facing down and pull it a few pulls. That sometimes alleviates flooding.

Just because the plug gets wet doesn't mean it can't be lean. If you pull it enough times you're still going to get gas into the engine. Nevertheless, if you know it's not flooding try pouring a tiny bit of gas right in the cylinder, screw on the plug, and pull. That should pop it over if it's a tuning issue.

-Tony
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Old 05-02-2011, 09:06 PM
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Quote:
Originally Posted by cris View Post
if you got spark,fuel, and air, the only thing left is compression. try dropping a few frops of oil in the cylinder, try starting it with the choke on, if it pops, take the choke off see if it runs.
Agreed!
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