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Author Topic: 86 Dr 250 wont run  (Read 4168 times)

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Offline Chilly

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86 Dr 250 wont run
« on: May 25, 2015, 06:50:37 pm »
I just picked up a 86 dr 250 and I cant get it to run. I have good compression and spark, cleaned the main jet, has a pumper carb and it squirts fuel as it should. Cleaned the tank and added fresh fuel and air cleaner is good. Out of desperation I put some aerostart down the plug hole and it ran for about 10 seconds.

Any suggestions.
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Offline mick25

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Re: 86 Dr 250 wont run
« Reply #1 on: May 25, 2015, 07:30:37 pm »
Could be the float valve sticking not letting fuel into the fuel bowl ?
One of my bikes done this because of it sitting to long ( a month or so not running )
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Offline cyclegod

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Re: 86 Dr 250 wont run
« Reply #2 on: May 25, 2015, 07:38:20 pm »
Stators can be a bit iffy on DR's I had one that would run perfect for 5 min and then die, after cooling off it would be fine again. Check the carb but also check the stator too.
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Offline Chilly

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Re: 86 Dr 250 wont run
« Reply #3 on: May 25, 2015, 08:26:19 pm »
Cheers, it has not run long enough to get hot and whenever I check spark it's always there even after it did run for that short time but I will still check the stator out. Besides cleaning the jet and making sure the float valve is ok is there anything else in the carby I should check and do these bikes need a battery to run?
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Offline Nathan S

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Re: 86 Dr 250 wont run
« Reply #4 on: May 25, 2015, 08:45:17 pm »
Don't need a battery to run.
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Offline cyclegod

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Re: 86 Dr 250 wont run
« Reply #5 on: May 25, 2015, 09:07:36 pm »
If it's a CV carb check the diaphragm
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Offline sleepy

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Re: 86 Dr 250 wont run
« Reply #6 on: May 25, 2015, 09:11:07 pm »
Check that the carb vent hoses are not blocked. I have a friend with a DRZ400 and it sat for about 3 months and wouldn't run due to an insect nest in the vent hoses.
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Offline pokey

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Re: 86 Dr 250 wont run
« Reply #7 on: May 25, 2015, 11:11:41 pm »
If it runs on aerostart then its a fuel issue.
pull it and strip , inspect and clean.
check flow from the tap. silly things like pinched hose and clogged taps have stopped bikes before.
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Offline Slakewell

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Re: 86 Dr 250 wont run
« Reply #8 on: May 26, 2015, 08:06:20 am »
Check cam timing as well. 
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Offline Nathan S

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Re: 86 Dr 250 wont run
« Reply #9 on: May 26, 2015, 12:38:04 pm »
Quote from: pokey on May 25, 2015, 11:11:41 pm
If it runs on aerostart then its a fuel issue.
pull it and strip , inspect and clean.
check flow from the tap. silly things like pinched hose and clogged taps have stopped bikes before.

This/\

How fresh is the fuel? Single cylinder 4Ts seem particularly keen to crack the irits over slightly stale fuel.
I know you said you added fresh fuel, but sometimes that's not enough - especially if the carb is still full of the stale old fuel.
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Offline 80-85 husky

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Re: 86 Dr 250 wont run
« Reply #10 on: May 26, 2015, 01:12:07 pm »
the carb will be full of green fungus preventing any atomisation of fuel with air. prepare to do battle when you get the bowl off!
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Offline Chilly

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Re: 86 Dr 250 wont run
« Reply #11 on: May 26, 2015, 06:03:57 pm »
IT'S ALIVE :), both carby breathers blocked!
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Offline Ekka

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Re: 86 Dr 250 wont run
« Reply #12 on: May 26, 2015, 07:09:50 pm »
that will do it
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Offline Chilly

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Re: 86 Dr 250 wont run
« Reply #13 on: June 02, 2015, 04:27:19 pm »
Anyone know what the oil capacity is, with and without filter change?
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