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DR350 caughs and does not rev

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tried 'search'

now I please need your help

my best buddy bought a 93 DR350S that would not start

and made it my issue to get it running

after fixing lot's of little things - air filter missing, swing arm slider missing, spark plug weak, chain kit dead, battery dead, brake pads ... -

and a bubble bath for the carb it now starts up fine

but does not hold idle and does only rev unwilling, caughing up to max 5000rpm, when rolling off the throttle it sometimes stays at 4000, coming off the rpms slowly, sometimes it just popps and shuts off

I am at th end of my whits

people with DR-knowledge, help please, help :smirk:

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It sounds like you have air and spark covered. Is the fuel delivery good? Floats set to spec, jets in the ball park, petcock operating properly? A tiny chunk of anything in one of the jets can completely disable a bike.

Also, check for cracks in the air boot.

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boot is OK

petcock OK

carb cleaned twice

what jets belong?

mixture screw how far out?

not even sure it is the right carb

how can I tell?

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135 Main jet is stock, 140 if you have the airbox mod.

I think a 37 pilot jet is stock, about 1.5-2 turns out on the idle mixture screw.

Here are some tips on carb tuning, float height adjustment:

http://dr350.wikia.com/wiki/CV_Carburetor_tuning

Your pilot circuit is probably OK, it sounds like the main has issues. Float problems definitely cause issues.

Does the slide move smoothly? Is the needle OK? The spring in there pushes on a washer that holds the needle down. If that's missing/damaged, the needle will jump around and screw up your mixture.

Check for air leaks on the cylinder side of the carb.

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the washer was on the wrong side,

that's what you get for rebuilding 'as was' after cleaning *blush*

the spring was stretched to almost an inch to long,

so now the DR350 revs properly

it does not - yet - want to idle at 1200, runs for a while then dies in a pop

I fear as soon as this bike runs right it will have to go

can not seem to make friends with manual deco

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it does not - yet - want to idle at 1200, runs for a while then dies in a pop

Idle should be set at +/- 1500 RPM -- 1200 is too low.

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