A Tale of Three Saws

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yeah the oem top that brad had pics of,sorry should have quoted the post i was reffering to:greenchainsaw:

No worries mate - I hoped that was what you meant :) Yeah the original OEM top end off that 660 was pretty average. Of course when Brad tidied it up it looked fine. Straight off the bat the MS660 BB kits that I got hold of needed no tidy up work done at all. They are very very impressive kits :cheers:
 
got mine today thanks matt, to change it over tonight or not. big decisions

Good stuff. What's your initial impression of the quality? Change it tonight - the famiy will understand then use it all weekend :)

And don't tell me you haven't looked yet or you wouldn't have typed your post just then :D
 
mate i been all over it like a fat kid in a lolly shop, and it sure does look very nice. very impressed with the quality, thought i would have to crutch a few dags off but its clean as.
 
mate i been all over it like a fat kid in a lolly shop, and it sure does look very nice. very impressed with the quality, thought i would have to crutch a few dags off but its clean as.

Dag away old son :) Then put the bastard on :cheers:
Then get your spotlight and go cut something!
 
I'm spewing - I completely missed page 47 of this thread and hadn't even seen the pictures of the new MS660's OEM internals. Sorry Brad for not saying anything and sorry to splitpost - I should have known what you meant mate :cheers:
So two 660's out of two had crappy internals. Pretty solid evidence that Stihl have dropped the ball. I can honestly say that these MS660 BB kits wipe the floor with the OEM parts as far as visual quality goes at least.
To think that the MS660's are basically their premier pro saw too :chainsaw:
 
Um I think I may have just spotted an issue with the 372XP BB kit on it's way to Will. I assume Al's kit would be the same...
No biggy but may suggest these kits are not the same as others on the market...

Anybody notice something? Or actually a LACK of something!

20082010211-1.jpg
 
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Um I think I may have just spotted an issue with the 372XP BB kit on it's way to Will. I assume Al's kit would be the same...
No biggy but may suggest these kits are not the same as others on the market...

Anybody notice something? Or actually a LACK of something!

20082010211-1.jpg

OK. Just heard back from the supplier and Al and it looks like Will is the only one to have lucked out on the hole! Supplier very upset though and said he'll be more thorough when checking future kits he has in stock.
 
I was finally able to get started on Matt's new MS660. I've already run into a couple issues with the BB kit he provided. Keep in mind, this is not from Baileys, so your mileage may vary.

1. The bottom of the exhaust port free-ports when the piston is at TDC. This was corrected in Baileys latest edition.

2. The piston skirts ever so slightly made contact with the case at BDC. It would have been entirely possible to bolt this topend on and start it up. Then the piston grows, it gets longer, and before you know it, boom, you've busted a piston skirt. So I slightly relieved the case for it to clear. This does not hurt the structure of the case, or prevent it from going back to stock.

3. The exhaust port is flat, or worse. It's higher on the one side than in the middle. This means I'll have to raise the exhaust to get a proper shape, which leads to the next issue.

4. The exhaust port is very high. It's at 94° ATDC, much higher than I would ever want one for a work saw. It's going to end up even higher since I have to shape the roof of the port. I'll just have to see how it turns out.


Stock Port Timing
Exhaust - 94° - 172° duration
Transfers - 118° - 124°
Intake - 81° - 162° duration
Blowdown - 24°


990909826_7sUZU-M.jpg
 
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