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Post by jeff84 on Mar 22, 2018 19:43:42 GMT -5
another reason you might have to give it a little gas at a stop to keep it going, especially if accompanied by hard cold starts, is valves being out of proper adjustment.
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Post by eclark5483 on Mar 22, 2018 20:24:04 GMT -5
I have mine set at 1800 +/- 100 rpm on the AF05 Sprees, and 2200 +/- 100 on the 139QMB TaoTao.
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Post by dexameth on Mar 23, 2018 7:45:48 GMT -5
My idle is 3000 with a top end of 8200... what could possibly cause that? It could be a number of things. Idle speed screw is in too far, or there's an air leak or a/f screw is adjusted incorrectly. 8200 is normal, I cruise there at top speed, WOT.
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Post by GrumpyUnk on Mar 29, 2018 9:20:05 GMT -5
Idling at 3000rpm could be caused by the throttle plate being held open too much by the screw atop the linkage.
Look down onto the top of the carb, and on the side where the cable attaches there is a fixed attachment with a screw. The screw is used to adjust the idle speed by keeping the throttle plate open just a bit from completely closed. Turn CW to increase idle speed, and CCW to decrease. If the cable adjuster, where the cable housing/sheath attaches to the linkage, is adjusted too tightly, the cable itself might be holding the throttle plate open even after adjusting the idle stop screw. In that case, loosen the jam nuts, and allow the sheath to move 'forward', in effect shortening the sheath. That should remove tension on the cable, and allow the throttle plate to close to the point the adjustment screw allows. Between each adjustment, at operating temperature, not cold, blip the throttle and allow the throttle and carb to settle at their 'new' idle speed. A 3,000rpm idle would be enough to keep going when you released the throttle, and I'd think rather unsafe. tom
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