Finally started this McCulloch BP-1 project, need some parts and advice....

[heimannm]

The OEM Auto-Mac chain is unique. The rim of the sharpening stone is supposed to touch the clutch drum to spin the stone to properly dress the chain. It works pretty well.



Mark

 

[Al Smith]

Is that a standard size like for instance 3/8" .050 ?

 

[heimannm]

The chain is 1/2" pitch, but the drivers are very small for 1/2" pitch chain so more uniqueness.



I never bothered to measure the gauge since this chain only fits the unique sprocket nose bar and drive sprocket.



Mark

 

[Deets066]

I believe @awol was runnin .404 on his

 

[Scotty Overkill]

I believe @awol was runnin .404 on his

The one BP-1 I have appears to have a rim drive, and it looks to be .404. The other one has a fixed drive that appears to be bigger.

 

[Scotty Overkill]

I don't believe you really need the governor anyway. Why can't you limit rpm with fuel like every other saw?

I ground the vain off of my 090, and just make sure it's tuned right

That, too, had crossed my mind early on in this whole saga. I can't really see the saw running away too far before leaning out from fuel starvation.

 

[Al Smith]

That is some odd chain .Coincidentally although the cutters are different one cutter followed by another ,then a space is similar to what Art Martin did for race chain .

 

[Al Smith]

The bar at first glance from the picture looks like a standard 10 series design .

 

[Scotty Overkill]

Found them, got a bag of them. Measure .506" in diameter.

Used these on my 790 as I had ported it, so new plugs were required to seal off the passages.

Wonder how I did transfers on that saw? Wasn't hard. Didn't need a right angle piece to do it like the newer ones require.

Edit: If these will fit, send a pm with address and how many you need. (got about 20 or so of them)

I measured those holes over the weekend and they're 3/8" (.375), so the plugs you have are too big. But I sincerely appreciate the offer!

 

[Frank bierce]

Nice lil BP for sale on the bay...
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/332574523369

 

[Scotty Overkill]

Nice lil BP for sale on the bay...
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/332574523369

Saw that, ready to rock and roll!

 

[Lightning Performance]

Some of the HL carbs are setup for the air vane governor already though. If you could fit an 070 or 090 carb in there.....

http://www.hlsproparts.com/product-p/h20090.htm

 

[Al Smith]

Nice lil BP for sale on the bay...
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/332574523369

That's Mark from I think Indiana .

 

[Lightning Performance]

That's Mark from I think Indiana .

Chicken Dinner

 

[Adirondackstihl]

I'm I'm not mistaken the bp-1 has a governor to prevent over speed. I'm not sure what the limits are on them but I believe they were recalled to be destroyed by McCulloch because they would over speed and explode. I'm all for this carb swap just don't want anybody to get hurt. I know Mark had that bp-399t around 22,000. That is a cool sound!

 

[Steve]

Yep that's Mark and Joe and I think mweba. (Sorry but I've not met mweba yet!). That was when Mark first fired it up! I remember one day Aaron (eccentric) all in a panic made a thread one day that Mark was piss reving the bp-399t at a gtg and locked it up at 22,500rpm! Turns out the fuel line just vibrated off! Thanks for posting the video!

 

[Steve]

Super awesome sounding engine too?

 

[drf256]

Yep that's Mark and Joe and I think mweba. (Sorry but I've not met mweba yet!). That was when Mark first fired it up! I remember one day Aaron (eccentric) all in a panic made a thread one day that Mark was piss reving the bp-399t at a gtg and locked it up at 22,500rpm! Turns out the fuel line just vibrated off! Thanks for posting the video!

What was this engine used on?

 

[Scotty Overkill]

What was this engine used on?

Pretty sure it was an experimental snowmobile engine.....

 

[Steve]

Pretty sure it was an experimental snowmobile engine.....

That's what I've heard too.