18-11-2017, 05:52 AM
If there is end movement fully closed the butterfly disc rim is likely worn, and/or cut into the body, or is positioned wrong on the spindle. Should block the passage very completely. The butterfly is bevelled and must be fitted right way round. All would be obvious with carb removed. On other diecast carbs, if flange repeatedly distorted the body becomes oval and butterfly will not seat. Linkage should not force spindle one way or the other. Normally, the butterfly should close on the stop, not internally on the body. The lid must form a reasonable seal above the idle jet. If casting is bubbled, bent or battered may not. Has the idle screw fallen out?If it has vacuum wiper is that bypassing somehow?