MS440 Magnum mods?

[logger]

I was wondering what are all the mods that I can do on my 440 and 460.  If I put a dual port muffler cover on them, would it make them run lean any?  Just wondering?  thanks. 8)

[clyde]

The dual port will have it running a little leaner.

[fishhuntcutwood]

As clyde said, they will be running leaner.  You'll need to retune the carb from to get it back into it's powerband.  Don't go off of factory specs after you put the dual port on.  You'll be best off tuning by ear.  Don't get carried away though.  You've mentioned in the past how you run your 44 at something like 15,000.  That'd be a bit fast.   

Jeff

[clyde]

My 460 was running at 14,200 after the dual port cover was installed.  I tuned it at 13,800.  It seemed best at that rpm.

[logger]

No, It's not mine that is running 15,000 rpm, it's my buddie's.  Mine is running at 13,800.  I'm going to set it at 14,000 soon.  8)   

[jokers]

No, It's not mine that is running 15,000 rpm, it my buddie's.  Mine is running at 13,800.  I'm going to set it at 14,000 soon.  8)   

Logger,

You do realize that the higher you set the out of the cut rpm, the leaner the engine is running, right? And the leaner the engine is running(assuming that you went too lean), the less power you will have in the cut.

The 440 or 460 just might cut better tuned at 13,800 than the factory spec of 13,500, there have been other saws like this, but a general rule on a stock saw is that you tune richer so that the rpm is a few hundred below factory spec and the in the cut rpm will actually be higher than a lean running saw.

Russ

[logger]

I tell you what, I ran it at 13,500 for awhile and then got it tuned at 13,800 and I can lean on it harder than it running at 13,500.  I know what you mean, I have an old craftsman 3.7 that is like that is very torquey for a 3.7 and 18" bar.  I blow out all my saws and clean the air filter after every day, so that maybe that makes a difference. 

But anyway, any other suggestions on modifying?  Thanks for all the help so far. 8)

[jokers]

I was wondering what are all the mods that I can do on my 440 and 460.

But anyway, any other suggestions on modifying?

Hi logger,

Don`t take offense when I suggest that if you don`t know of the mods that can be done to get more power, that you probably aren`t capable of doing them yourself, atleast at this time. Your best bet would be to talk to a builder, possibly EHP, who is extremely busy right now, or Dave Neiger who is probably also quite busy. Almost forgot Dean Hylton who has a reputation for being free with advice.

If you want to try your hand at modifying your own saws you should read and understand a couple of books and talk to any tuners who will give you the time of day, of course after you have developed enough knowledge to have an understanding of what they may share with you. It would be unfair to expect anyone to give you a "from the ground up" knowledge of what to do.

Two excellent books to consider are the "Two Stroke Tuner's Handbook" by Gordon Jennings and "Two-Stroke Performance Tuning" by A. Graham Bell.

There are many other web resources, some of which should be taken with a grain of salt, but Eric Gorr and macdizzy are good. They will expect you to have fundamental knowledge of two stroke mods and operating principles before your questions will be taken seriously enough to reply to.

Hope this helps.

Russ

[logger]

Thanks Jokers, I think I am going to try to get a hold of EHP to see what kind of advise he has for me.  Thanks for all the input guys. ;D