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78 Dt250 Just shut off


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if i hold the choke it works fine throttle response is fast.but i let go of the choke and roll it than it bogs down....

You need to strip and clean the carb again, the fact that it works fine with choke and not without choke suggests fuel starvation, give it a good clean examine the jets carefully for blockages or restictions, use a good magnifying glass if necessary as its not easy to see through some of the small holes. Also use an aerosol carb cleaner and compressed air to blow through the small passageways in the carb...Best of all have it ultrasonic cleaned.

Note if you do use carb cleaner, remove items that have rubber components or 'O' rings such as choke plunger and air mixture screw first, keep carb cleaner away from these parts.

When its clean check and set the float height to specification.

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