Briggs & Stratton 250000 Spécifications télécharger pdf (Page 91)

NOTE: SPECIFICATION TABLES BEGIN ON PAGE 63 OF THIS SECTION.

Throttle Shaft, Plate and Bushings (Typical)

Excessive wear of the throttle shaft and/or throttle

shaft bushings can contribute to poor engine

performance.

Check Throttle Shaft and

Bushings for Wear

1. Wear between throttle shaft and bushings should

not exceed .010” (.25 mm).

2. Check wear by placing a short iron bar on upper

carburetor body as shown in Fig. 136.

3. Measure distance between bar and shaft with

feeler gauge (1) while holding shaft down and then

holding shaft up.

Fig. 136

4. If difference is over .010” (.25 mm), either upper

body should be rebushed, throttle shaft replaced,

or both.

5. Wear on throttle shaft can be checked by

comparing worn and unworn portions of shaft.

6. To replace bushings, see next.

Throttle shaft should be removed only when necessary

to replace throttle shaft and/or bushings.

To remove throttle shaft, use a thin punch (1) to drive

out pin (2) holding throttle stop to shaft, remove throttle

plate, then pull out shaft, Fig. 137.

Fig. 137

To Replace Throttle Shaft Bushings

1. Place a 1/4” x 20 tap (1) or an E-Z out in a vise.

2. Turn carburetor body to thread tap or E-Z out into

bushings (2) enough to pull bushings out of body,

Fig. 138.

3. Press new bushings into carburetor body with

a vise.

4. Insert throttle shaft to be sure it is free in bushings.

5. If not, run a size 7/32” drill through both bushings to

act as a line reamer.

6. Install throttle shaft, valve and stop.

Fig. 138

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Briggs & Stratton 250000 Spécifications Page 91