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If you go over to the chainsaw section of this forum and do a search on mix ratio, you will have orders of magnitude more reading material on this subject than you will ever have time to read. If I recall, there is one thread on there from several years ago that runs hundreds of posts and gets pretty technical from both ends of the spectrum, both pro and con re: departing from the standard 50:1 ratio the manufacturers will tell you. Intersting post, but how many hours of that can you digest at a time
For what it's worth, and I happen to think this is quite an eye opener, when I bought my 395XP it came with the European version of the manual, and it stated that for their saws over 80cc to use 33:1 and not 50:1. (see pic below). Interesting. They don't make two different 395XP's... I bought this saw here in the US anyway... but the manual said 33:1 for their big bore saws. When I asked a Husky dealer about this he told me the saw won't pass govt emissions tests at 33:1, and that the big bore saws WILL run fine on 50:1. I find it interesting that Husqvarna is telling the Scandinavians to run 33:1 in their big saws, and the Americans to run 50:1. I run 36:1 in my 395 milling saw, and 43:1 in all my other saws. Been doing that for years, no problems.
...that is no typo, as if somebody accidentally inserted a 3 instead of a 5. When they wrote that manual they went to the trouble of making a two column mix oil chart, one column for their saws less than 80cc and one for their over 80cc saws. They state that for thier big bore saws run 3% oil, which comes out to be 33:1. This is not an old saw, it was bought 3 years ago, and the date on the back of the manual is (at least I'm assuming it is a date)...
2004-04-19
I'm quite sure the saw will run fine at 50:1, as many run even the big bores with that mix. However, there must have been a reason the Husky engineers originally recommended 33:1 for those larger saws... they didn't just do that on a whim. Again, I've been told by more than one dealer that the saws won't pass the US emissions test with that 3% mix. Not trying to start anything... I don't think there is some huge conspiracy where even though the slightly richer mix might be better for the saw in the long run, in order for them to pass emissions and be able to sell saws here they sacrificed longevity... don't necessarily think that's the case. Do I think that in the long run those big bore saws DO perhaps last longer with a richer mix? I'm not an engineer and can't tell you why, but yes.. I do think that. Thus if the manual that came with the saw says 3%, I'm gonna run with that and sleep like a baby.
For what it's worth, and I happen to think this is quite an eye opener, when I bought my 395XP it came with the European version of the manual, and it stated that for their saws over 80cc to use 33:1 and not 50:1. (see pic below). Interesting. They don't make two different 395XP's... I bought this saw here in the US anyway... but the manual said 33:1 for their big bore saws. When I asked a Husky dealer about this he told me the saw won't pass govt emissions tests at 33:1, and that the big bore saws WILL run fine on 50:1. I find it interesting that Husqvarna is telling the Scandinavians to run 33:1 in their big saws, and the Americans to run 50:1. I run 36:1 in my 395 milling saw, and 43:1 in all my other saws. Been doing that for years, no problems.
It's good to add more oil to the mix when milling,however the carb should also be readjusted for the change.More oil means less gas in the mix.Less gas creates a lean mixture which can damage the saw as well.Always richen the carb setting when changing the mix ratio.
