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150cc GY6 and Under Engine Tech GY6 and Smaller Technical Discussion Forum |
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#1
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why no bang?
help me out here guys ive got very good spark and good fuel supply but the buggy will not crank up just keeps turning and turning its a gy6 in a dazon 150r was out riding sunday took a break and could never getr to start back up? all wires are connected, all fuel lines good, and all vacum lines check out so whats next?
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#2
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Have you tested the FEV?
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#3
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What's your compression? Hold the throttle wide open when testing.
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#4
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compression is strong but whats the fev?
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#5
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FEV - Fuel Enrichment Valve. adds a bit of gas to richen the mix to aid in cold starts. Its' supossed to shut off after the motor has warmed but it's a electrical thing so it's not dependable and prone to cause problem at times. If the fev was at fault the motor should still fire up but run crappy due to a rich mixture. I would suggest checking valve lash. The valve setting tend to tighten up after a while and cause the problem you describe
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