not only a defect rotary valve (bigger than 0,05mm) causes blowback that makes big Problems with the si carb but also the oilsucker itself. i finally got it on pics and Video. the annoying oilsucker Problem of potentially all largeframe engines also causes blowback. why original Setups with low inlet- and cylindertimings dont mind oilsuckers, i dont know.... it hits in when u start Tuning. u cant set the si carb right anymore. for low revs u go lean (leaner thn u should due to the too rich mixture cause of the additional oil) therefore you are too lean in high revs and will kill your cylinder. oilsucker engines cant even be used for plug and play Tuning unfortunately... = all vespas younger than 2001. --------------------------------------------------------------------------
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12 окт 2024
