| Carburetor Overhaul |
| Student mechanic Dillon Hryze overhauls a bike. |
From "Trade School"
episode DTRS-210 |
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(Continued from page )
The next day, Dillon disassembles the carburetor and cleans out the ports with carburetor cleaner (figure G) and scrubs with a dry paintbrush to remove the deposits (figure H). With the carburetor disassembled, he takes time to inspect and measure (figure I) the level of the float, which helps to regulate intake of fuel in the carburetor. With a new set of gaskets, he then puts the carburetor back together (figure J).
At this stage, Dillon finds a problem with the old motorbike. Some of the threads inside the carburetor have been stripped from over-tightening. Dillon uses a tap to re-thread the holes (figure K). He also replaces some damaged screws and bolts that hold the carburetor onto the frame (figure L).
When Dillon is finally able to successfully reassemble the carburetor, he tries to start the bike but is unsuccessful. He replaces the battery, but to no avail. Consulting with his instructor, Dillon discovers yet another problem. When he reassembled the carburetor, Dillon placed the petcock (the manual fuel control) on incorrectly (figure M). With this problem corrected, the bike starts but occasionally backfires and stops running. The backfires tell Ed that the air-fuel mixture is too lean, meaning that there is too much air and not enough fuel reaching the cylinder. To solve this problem, Ed instructs Dillon to re-adjust the float level (figure N).This time the engine starts and keeps on running, indicating his first successful overhaul (figure O).
Dillon is now one step closer in his pursuit of a career in motorcross.
RESOURCES :
Warren Tech High School
13300 West 2nd Avenue
Lakewood, CO 80228
Phone: 303-982-8600
Website: www.warrentech.org
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