Sophomore Rider
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Post by dyoung1167 on May 30, 2016 8:26:03 GMT -5
quite familiar with 150's, but i am currently working on a 50cc with carb problems. i have cleaned it several times as it sat for a year or so and apparently had water in the tank causing a mess. after said cleanings i can't get it to go beyond about 8mph and have givin up on the carb, just going to order a new one. anyway, the 150's have a decelerator valve/diaphragm on the side near the top for when letting off full thottle , when looking up 50cc versions they are calling a similar small diaphragm but with a plunger on the bottom of the carb an "accelerator pump"?
i'm guessing wordage is just a bit messed up or confused but is this or is this not the relative equivalent to whats on the 150 and work about the same way, allowing a touch of extra fuel through when the throttle is suddenly reduced to zero so it doesn't stall out?
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Sophomore Rider
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Post by dyoung1167 on May 30, 2016 8:55:10 GMT -5
also, does anyone know the true stock size? found three sizes and of course they all say they fit most 50cc gy6's. going to measure but as i'm sitting here waiting to go to work i thought i'd ask.
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Post by tortoise on May 30, 2016 10:27:20 GMT -5
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Post by JerryScript on May 30, 2016 10:40:46 GMT -5
The two pumps are different. One prevents stumbling when releasing the throttle, the other prevents bogging when first turning the throttle.
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Sophomore Rider
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Post by dyoung1167 on May 30, 2016 22:47:46 GMT -5
can i ask how that works?
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Post by JerryScript on May 31, 2016 6:03:44 GMT -5
The accelerator pump is a curved piece of metal that presses a plunger which pumps a small squirt of fuel into the carb when you first twist the throttle. This helps to compensate for the extra air coming in when the butterfly first opens, which causes a temporary drop in suction. It is adjustable by bending the curve of the spring to give the squirt sooner, or straightening the curve out a bit to give the squirt later. If you are bogging at take-off, adjustments to the accelerator pump may help.
The decel-enrichener system is a small device mounted to the side of the carb, containing a small diaphragm and spring. It adds an additional measure of fuel during the very high intake vacuum that exists during closed-throttle deceleration at road speeds. It’s sole function is to help reduce exhaust backfiring during deceleration by preventing a lean condition from occurring.
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Sophomore Rider
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Post by dyoung1167 on Jun 1, 2016 7:15:43 GMT -5
ok, thanks.
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