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Post by Clank on Jan 18, 2016 3:06:25 GMT -5
So what does it indicate if the scoot will only run with the A/F screw all the way in and barely backed out? Like maybe 1/64 out.
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Post by paceneedsstides on Jan 18, 2016 11:34:04 GMT -5
too rich an idle jet?
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Post by 90GTVert on Jan 18, 2016 13:38:24 GMT -5
On the stock carb, the mixture screw controls fuel. You are blocking the fuel passage and leaning the mixture by turning the screw in. Your engine needs the leanest settings to run. A smaller pilot jet would be a good idea. 2-4 numbers down will hopefully allow you to tune it without the screw needing to be all the way in or way out. Could also be something like float height set too high, but you may notice richness throughout more of the early throttle or even have overflow in that case.
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Post by Fox on Jan 18, 2016 15:06:01 GMT -5
I have run across that a bunch of times myself. At first I assumed the enrichment jet wasn't being shut off completely upon warm-up but the enrichers always worked when I tested them. I saw this video that shows that you can actually adjust the enricher by measuring the carb and the enricher when it's fully extended and twisting the body of the enricher on the base somehow but it's in Portuguese or something. I thought that it's another thing that could possibly solve issues with idle and stalling etc.. but I have never tried it myself.
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Post by Clank on Jan 18, 2016 17:12:45 GMT -5
Just curious if say a 38 pilot jet is too small? I had a 32 in it but I'm running a 52mm so I assumed it's gonna need more fuel but I'm not quite sure if size to jet is the same ratio. In other words I increased the cc displacement by approximately 80%. So shouldn't my jet go up 80% as well?
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Post by 90GTVert on Jan 19, 2016 8:46:23 GMT -5
No, I wouldn't use 80% as a rule. You don't even always need to increase the pilot with a BBK. Unless I get what's happening to you, where the screw needs to be way in or out, I leave it.
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