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Yes, nice saw Gary! I'm sorry for overlooking your pictures. I just don't know much about the older models, let alone gear drives. :cry:

It looks like "noodles of fun" in the future! :chainsawguy:

:cheers:
 
I just purchased an SP80 with the 104cc west bend 610 racing motor in it. Does that qualify for this thread? I will post vids once it gets here. I will be interested to see what clutch the builder used. When I spoke with him on the phone he said it was running a 3/8 rim drive. I guess you could call it a "Mac Bend" or maybe a "Bent Mac".:greenchainsaw:
 
hoss said:
I just purchased an SP80 with the 104cc west bend 610 racing motor in it. Does that qualify for this thread? I will post vids once it gets here. I will be interested to see what clutch the builder used. When I spoke with him on the phone he said it was running a 3/8 rim drive. I guess you could call it a "Mac Bend" or maybe a "Bent Mac".:greenchainsaw:
Click to expand...

I can't wait to see those videos!
 
Hey Gary, if Stinkbait hasn't already given you the info, I have a good phone number for a place that can sell you new .404 gears for that beast of yours. It'll make finding sprocket tip bars and modern pitch chain a lot easier. This is what I did on my 890 Mac.
 
Gary the 640 came with eather 2:1 or 3:1 trans.
If you can find the numbers on it.

2:1 trans p/n #60633

3:1 trans p/n #60464
 
hoss said:
Hey Gary, if Stinkbait hasn't already given you the info, I have a good phone number for a place that can sell you new .404 gears for that beast of yours. It'll make finding sprocket tip bars and modern pitch chain a lot easier. This is what I did on my 890 Mac.
Click to expand...

Thanks Hoss... I'll send you a PM... :)

Mr. Bow Saw said:
Gary the 640 came with eather 2:1 or 3:1 trans.
If you can find the numbers on it.

2:1 trans p/n #60633

3:1 trans p/n #60464
Click to expand...

I'll check that in a bit... I have to go make room for the 797 that will be at my door in a week... :clap::clap::clap:

Gary
 
If it's hard to find the number, just turn the flywheel once and count the revolutions of the output shaft.
 
ProMac1K said:
Good tip there!

Just like checking axle ratio's......

:popcorn:
Click to expand...

Works well. Actually Mac must have rounded down the ratio on the 3:1 case. You will get more than 3 complete revolutions doing it this way. At least that's how it is on both of mine.
If you ever want to measure the twist in a rifled bore, try something similar. Take a cleaning rod with a tight fitting patch that engages the rifling tightly. Mark the rod with an index point, extract the rod until the mark does a complete 360, then measure how much you removed the rod out of the bore to complete the revolution.
 
This is OT of the OP thread, but since you brought up checking rifling..... Have you tried measuring old fixed choke shotgun barrels to see what choke they are? There must be some data out there somewhere to compare it to.
 
For you McCulloch Fans.....2 650 Pro Macs one 310 Pro Mac for sale

Just saw this on our local Craigslist: 2 650 Pro Macs and a 310 Pro Mac. For more info click here.

If I can help in any way for you out-of-area buyers, just let me know.

NP
 

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