Mastermind meets the Dolmar 7900

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If I recall correctly the Walbro HD 12 carb that came on the 372 will bolt right in as well, not sure about the venturi size though.

The Walbro is actually a bit smaller than the Zama. Walbro is 16.67mm and Zama is 17mm.

I would prefer a straight bolt on mod, I'm not keen on cobbling up things up to get them to fit. However, it is just a firewood saw not a production saw, so if things rattle loose I can always walk back to the shed.

According to the Walbro part list, the HD-12 is 17.46mm, while the HD-6 is 16.67.
 
now that you have raised the bar with the 7900 ,you will just have to start building stronger 372's and 440's :popcorn:
 
Good call... Can't wait to see it run...

We're doing two.......this first one is being a complete pain in our asses. Jon's about ready to chunk it in the woods.

He just tore it back down to check everything.......it appears that the intake boot isn't sealing at the carb base.
 
We're doing two.......this first one is being a complete pain in our asses. Jon's about ready to chunk it in the woods.

He just tore it back down to check everything.......it appears that the intake boot isn't sealing at the carb base.

Duct tape? :popcorn:
 
We're doing two.......this first one is being a complete pain in our asses. Jon's about ready to chunk it in the woods.

He just tore it back down to check everything.......it appears that the intake boot isn't sealing at the carb base.

Poor Jon...
He needs a raise..
 
We're doing two.......this first one is being a complete pain in our asses. Jon's about ready to chunk it in the woods.

He just tore it back down to check everything.......it appears that the intake boot isn't sealing at the carb base.

Tell Jon I feel his pain right now.. got a 372 that wants to fight me right now.
 
I enjoy running a 7900 as they do seem light and handle well. I don't like the ass backward kill switch though. :laugh:
I'm thinking about sending my Dolmar to Randy, thought I'd bring up an old thread. Anybody else have their 7900 Masterminded? I'd love to hear some feedback... the pics and videos are gone from this thread. :(

The kill switch thing makes me laugh, you can just pop it out and flip it over and then it's the same as a Husky! :laugh:
 
I remember this saw very well. I was at Terry's last GTG.....eating a hot dog. I hear a saw fire up, and make a few cuts. I could tell it was turning incredible RPM in the cut......so I got my tach and checked it. Nearly 12,000 RPM in the cut !!!!! My 372XP was turning about 100 less RPM......and I thought it was pretty mean.

I asked the guy......."who ported this saw?"

He said you did Randy.....about three years ago.

Welp.......I dug thru my notes.....and that saw was the saw in this thread.

It has a new OEM top end with the lightweight slab sided piston....nothing special in the port work. No carb work or anything.

I have my notes on it.......and still do every 7900 the same way. I just cut the squish now instead of doing a popup piston.
 
Looks like it runs pretty good! :bowdown:

I'm sure this has been discussed before, but... How do these saws compare to other ported saws in the same class, like the 372 or the 460/046? Or the 064 since you're already doing one for me? :D
 
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