Stihl 046 big bore questions

[fathead]

Im looking to buy a 046 for a project saw. I'm wanting to put in a big bore kit. I havent bought the saw yet, and Im wondering what to look for in the saw, (ie,serial number or year). Any help or pointer I can get on this venture would be appreciated. I have also heard about putting big bore kits in a 044 and opinions on this would also be appreciated. Thanx.

 

[fishhuntcutwood]

For an 046, find one after S/N 154517175. This will get you the latest, improved crank.

I've got a tech note somewhere bout the 044's upgrade you'd need to look for. It's basically known as a small pin or large pin 044. You'll need the large pin to be compatible with a big bore kit. Lakeside53 will get on here later on and be able to fill you in if I can't find that number first.

As far as the big bore in general, try a search on here for "big bore" or simply "bb" and you'll get a bunch of good reading.

Welcome to AS.

Jeff

 

[sawinredneck]

Welcome to AS fathead

The BB 046 is a sweet saw when done properly!!! Not sure about the updates, so I am no help there, but I will encourage you do to it all the way
Andy

 

[drunkenredneck]

For the 044 you'll need to find one after serial number 129 xxx xxx, not sure about the last numbers but if you find one after 129 as the first three you should be good. As to how they perform, if you just go from stock to a big bore it's noticable but nothing spectacular. If you mod it on top of the big bore they can get pretty wild all depends on how far you want to take it.

 

[Lakeside53]

Just in case someone gets a serial number just after 129 xxx xxx - the actual number for the larger crank pin etc is 129 382 283 onwards.

 

[Kneejerk Bombas]

How about the 066/660? How many different crankshafts are there and which are interchangeable?
And serial numbers?

 

[Lakeside53]

There are two basic cranks for the 066/660 - 1122 030 0407 and -0408. At serial number 133 0917 066, the crank was updated to run larger bearings. This is also the serial number when the flywheel changed from metal to poly.

You cannot interchange the two cranks or flywheels.

 

[Kneejerk Bombas]

Thanks Lakeside. You can't even imagine the frustration you saved me with the last few posts.

 

[Canyon Angler]

Not to hijack the thread but...

Lakeside, What's up with the metal vs. plastic flywheels on the 066/660? Seems like metal would be better, but I seem to recall hearing the plastic flywheel was better. If so, why? Thanks and sorry for the thread interruption!

 

[blis]

Not to hijack the thread but...

Lakeside, What's up with the metal vs. plastic flywheels on the 066/660? Seems like metal would be better, but I seem to recall hearing the plastic flywheel was better. If so, why? Thanks and sorry for the thread interruption!

the poly-flywheel has greater inertia + its lighter so its better than metal one, also the ones with poly-flywheel have beefier crank,,

 

[Frank Boyer]

If the poly flywheel is lighter wouldn't it spin up easier, but slow down quicker? Race engines use lighter flywheels because they are more responsive to throtle opening.

 

[Kneejerk Bombas]

A good discussion on the subject of poly vs metal flywheels:

http://www.arboristsite.com/showthread.php?t=40132

 

[blis]

If the poly flywheel is lighter wouldn't it spin up easier, but slow down quicker? Race engines use lighter flywheels because they are more responsive to throtle opening.

The weight isnt everything, the location of mass changes the inertia of flywheel...

 

[Canyon Angler]

A good discussion on the subject of poly vs metal flywheels:

http://www.arboristsite.com/showthread.php?t=40132

Thanks, Mike. Hoo boy that thread got a li'l bit RUGGED!

 

[Freakingstang]

If the poly flywheel is lighter wouldn't it spin up easier, but slow down quicker? Race engines use lighter flywheels because they are more responsive to throtle opening.

Basically yes, yet it is hard for some people to comprehend that statement

 

[Kneejerk Bombas]

Thanks, Mike. Hoo boy that thread got a li'l bit RUGGED!

That picture is hilarious. You should embed it in the post.

About the thread being rugged, you know what they say, "If you want to pee with the big dogs, you need to lift your leg higher."