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Stihl Contra Info Sharing Thread
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<blockquote data-quote="Eddy_t" data-source="post: 5390333" data-attributes="member: 115543"><p>Venturi size is the main difference, other than needle location on the newer carburettors. The larger Venturi draws less fuel, so can run larger bars. I think skallywag posted up the sizes a while back, but between the hl112a (which I think is 20mm) and the ones used on the 090, (hl two hundred and something, which is 25mm) it uses 20% less fuel on the same setting on the same saw. This means the saw is leaner, so it can compensate running a longer bar. I think the hl74 was about 17mm, so it wouldn't lean out enough to pull the 5+ feet bars that a lot of the later models are seen sporting.</p><p></p><p></p><p>Sent from my iPhone using Tapatalk</p></blockquote><p></p>
[QUOTE="Eddy_t, post: 5390333, member: 115543"] Venturi size is the main difference, other than needle location on the newer carburettors. The larger Venturi draws less fuel, so can run larger bars. I think skallywag posted up the sizes a while back, but between the hl112a (which I think is 20mm) and the ones used on the 090, (hl two hundred and something, which is 25mm) it uses 20% less fuel on the same setting on the same saw. This means the saw is leaner, so it can compensate running a longer bar. I think the hl74 was about 17mm, so it wouldn't lean out enough to pull the 5+ feet bars that a lot of the later models are seen sporting. Sent from my iPhone using Tapatalk [/QUOTE]
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