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What kind of wood are you cutting over there? You have me curious why you would need .404.
Quote from: webgal on December 16, 2013, 10:40:03 amWhat kind of wood are you cutting over there? You have me curious why you would need .404.Rubber wood.Softwood when its standing.Hardwood after processing.The bark has rubber latex/resin.MS460 was the saw being used. Now its the MS461.But we are seeing too many saws go down with crankshaft big end burn outs.Though the same crankshafts are also running on the 460.Chain is Full chisel Stihl RSC, Carlton A3 and Oregon 75LGXBar length is 18". People here are 5 to 5.5 feet tall so a bigger bar become unwieldy on the local terrain.I think the cranks are failing from a low load condition, where over-revving occurs.(I know there is a speed limiter in the 461)So, I was thinking whether a re-port and change to .404 chain would be a solution.
@AdkStihl: Saws run here on 25:1 fuel. Its not that not enough lubrication.
I dont have any cylinder porting expertise. And there is nobody here who knows how to do it.
Why 25:1? (edit)
But I would assume that by porting the 461 and increasing performance, you would also be increasing load on the bottom ends.
Or is the result of porting only a high performance engine?
filing the slots on the ignition module to retard the ignition timing.
Why not make it easy and use a more appropriate saw for the job? Retarded timing will cause hotter engine temps. I wonder how good your local oil really is? Use a under rated saw, for example Husqvarna 353 vs a 346xp.
Quote from: 5000+ on December 17, 2013, 06:42:03 pmWhy not make it easy and use a more appropriate saw for the job? Retarded timing will cause hotter engine temps. I wonder how good your local oil really is? Use a under rated saw, for example Husqvarna 353 vs a 346xp.It might be hard to believe, the 046/MS460 has become the benchmark here.So a more appropriate saw is just not acceptable.The local oil is good. I have tried it at 50:1.It works fine.@HolmenTree:Its happening to both ie 25:1 amd 50:1.But more of the latter.
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