50cc carburetor tuning for Keihin CVK on a QMB139 Chinese scooter engine

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2 years ago
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carb carburetor qmb139 tuning tunning tutorial gy6 50 cc 125 150 cvk keihin chinese china scooter moped mopped how to tune fix doesn't run start gas rich lean main jet pilot idle setting choke fuel air enricher electronic mixture tips 4 stroke needle jets instructions vacuum vacum tune up performance de-restrict faster foam filter jetting carb tao roketa rocketa sym honda yamaha vespa paulz1265 lab coat paul shpakov shapkov schpakov tricks complete explained slide clip valve inlet intake spark throttle restrict derestrict upgrade top speed

Main jet kit: http://www.partsforscooters.com/114-49-QMB139-Main-Jet-Kit?sc=34&category=133078
Air filter: https://amzn.to/2ref3uw
Carburetor: https://amzn.to/2JL7li2

0:00 intro
0:57 Main jet
3:37 Elevation
7:26 Pilot jet
10:00 Idle
11:47 Needle
13:11 Accelerator pump
13:36 Temperature
14:21 Summary

This is a complete tutorial showing you how to tune a 50cc Chinese scooter carburetor. I will show you how to select the right jets, check the spark plug, and how to tell if the engine is running too lean or too rich.

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