1980 magnum ii
21mm dellorto racing
93 main, 60 idle
malossi 4 petal intake
i put it all together today and i am amazed at the speed / acceleration. out performs my tuned vespa grande (and a lot quieter too).
anyway, my issue is that i hear a slight "whirring" sound when coasting above 30 mph. it sort of sounds like a fast spinning...hard to describe. I just never heard it on my cvt vespa.
i heard it before i kitted, so it's not a new issue, just noticed it a bit more with the higher speeds.
it doesn't seem to affect performance (the moped runs quite fast and smoothly), but i was just wondering if this is an issue I should address. If anyone (i'm sure there are lots of za50 experts here) has experienced this or knows what this may be, please share.