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Post by henri on Mar 20, 2015 9:03:22 GMT
ive always had them as rich to lean =be4,be2,be1,be3,be5, with be6 on the end as leanest ,
but ran across a beginners guide on the lml owners group that has them as be2,be3,be1,be6,be5,be4 , accredited to vivo scooters who i dont know ,
has anybody else got any info on which is right , my memorys way seems more logical an has piaggio's wild card be6 where i'd expect it , its used on the lean running cosa with extra filters , vivo's way seems really random , puzzled i am , H
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Post by vespasco on Mar 20, 2015 12:21:08 GMT
The rule of thumb is the more holes at the top of the mixer, nearest the air corrector , the richer it will be at high rpm
Dellorto dont even have much info on this subject.
Webber may have tho!!??
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Post by rab on Mar 20, 2015 12:51:11 GMT
Webber are the carb gods that mikuni tried to follow I still have an old xr2 Webber somewhere
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Post by bryno on Mar 20, 2015 13:29:59 GMT
Vivo eh the same guys who sold expensive restored Vietnamese imports in the UK (with LML engines), now defunked I believe.
That guide is the only one i've come across re atomisers.
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Post by henri on Mar 20, 2015 16:34:31 GMT
Aaah so there a trustful bunch eh , it was on the lml site i found it , but years ago i saw another one thats what my memorys dragging up an what ive worked to for ages , dont think i'll message dell' n ask , dont want to interupt em writing a reply to my last query , 18 months ago, H
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Post by rab on Mar 20, 2015 17:45:16 GMT
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Post by vespasco on Mar 20, 2015 19:25:11 GMT
Heres an email from Matt Cooper @ Dellorto re: Atomizers on si carbs. Hi Not much info on these, sorry. Basically holes at the top of the tube will make it richer at higher revs and vice versa. With ref to non INC dellorto jets... There are lots of copy jets around, they are not measured in the same way as Dell'Orto so they are not comparable. Best regards Matt Cooper eurocarb Ltd Ive emailed him a few times about si carbs and he's normally pretty speedy with a reply if you keep the question basic enough. But do remember, he did not design the carb  Hope that helps |
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Post by sime66 on Mar 20, 2015 19:51:22 GMT
Chaps, I started looking at this earlier, found a few things that might prove to be useful, but got distracted. These need running through a translator, the little tables interpreting, and I need to go back and find the context of the source, but they might make more sense to some of you, or you might see them and know they’re not useful and save me a lot of time finding that out for myself. Here they are; do they shed any light on it?    Vollgas = full throttle Mittel = medium Unten = below Oben = top Flache = flat Gesamt = total  |
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Post by pxguru on Mar 21, 2015 8:10:43 GMT
Thats pretty much everything on the net about SI atomisers! BE3, BE5 and BE4 are all the same high rpm just the mid range changes. They are weaker to richer mid range in the same order. If seeking perfection in a set up it is possible to drill some more/bigger holes to get it running just right  |
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Post by henri on Mar 21, 2015 11:19:05 GMT
richard bowman , that names ringin a bell but i cant pin down the memory , yet, an for kitted lammies its common for tuners to re-drill the atomisers with model makers drills , to fettle the mid range jetting , but thats just bretta owners for ya ,never happy til there pushing it down the hard shoulder ,
i'm still struggling to pin down where i got my original understanding of the progression from , maybe ive had it wrong for years ,or my brains just re-organised it to be logical/make sense to me , either way its annoying theres no info out there to set me straight , an i'm not trusting vivo's stuff , H
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Post by rab on Mar 21, 2015 16:19:21 GMT
It used to ring bells back in the lates 80 through the 90s in my local area normaly police bells lol
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Post by henri on Mar 21, 2015 16:35:02 GMT
sounds like my kind of guy , maybe we woke up with hangovers in the same drunk-tank sometime , tho i suspect the memorys connected to scooters some how , i always behave in yorkshire , the local cops dont mess about an are use to bouncing drunk miners around , H
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Post by vespasco on May 5, 2015 23:40:07 GMT
This is how i see it,  These are a mix of INC and SCL stamped mixers. You can just see the difference in quality between SCL Spaco and INC Dellortos....look closely at the drilled holes....the inc are nicely finished.... The scl ones, i can see from here, the holes have burrs, poorly finished. Theres not a huge amount of difference between 3,1,5 and 4 I think its pretty much the same for hi rpm too, if you move the 6 to the other end* *Edit: i mean if you use the bottom set of holes in the red area only, as a guide for hi rpm. Eagle-eyed may spot that the 'BE2' in the pic is in fact an E2 B-) Dont phone, its just for fun |
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Post by henri on May 6, 2015 6:39:14 GMT
your progression is almost same as vivo's ,with only 6 being different ,an see what you mean about dell' versus spaco, maybe ive had it wrong all these years ,wouldnt be first time , its just i expected the 6 to be leaner , it being used on the small jetted cosa with extra filter , guess piaggio richen the mixture with atomiser to compensate for tiny main jets , confusing EEC/green emission controls to blame ,
i think i'll just go back to not trying to tune atomisers an keep to stock, after all i'm rarely in that rev range , tick-over to WOT-off/on being my prefered throttle use . H
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