New Project Saw. Dolmar PS-7900!

[nnero]

I finally have a big Dolmar...in pieces. My future father in-law has been repairing saws for people he knows recently. They are big fans of Dolmars and gave him 2 red top 7900s and wanted one back that worked. I got what was left over for $25. So I have a 7900 that needs a new flywheel (some fins are broken off), cylinder cover, upper rubber av bushing, various hardware, killswtich and some other stuff. It turns over hard and the piston and rings don't look good. Don't know about the cylinder yet but it is stamped Mahle. Ill try to get it cleaned up this weekend and remove the cylinder for a better look. My plan is to get this saw up and running with new or used parts. I think it'll be a cool "rise from the ashes" kinda story. Will get pics up ASAP

 

[mu2bdriver]

Nice score! I've been lusting after one of them to complement the herd.

 

[wde_1978]

Good luck with that rebuild , I hope it works out for You!

Once back on her feet , she should be a strong reliable runner.

I'll keep an eye on this one!

 

[nnero]

Thanks! Ive been wanting one for a long time but a new one was too far out of reach. Thats why we went with the 6100 and the have the Pioneer P-61 (By far my favorite saw) as the big guy. I think this will fill in the gap very well, depending on what is needed. Im hoping to keep it under $300 including bar and chain. If I can sell some stuff to fund the build it will go quicker if not it might take longer. Either way being out $25 isnt so bad. Im not gonna order anything until a thorough cleaning/parts needed list. Ill post the dirty parts in a box picture when I get home.

 

[cgraham1]

The 7900 does not have a cat muffler. I may have a few parts laying around. I'll check and let you know.

I love my 7900!

 

[jar944]

Good deal, You are going to really like it. I like my 7901 so much I picked up a basket case 7300 a few months back so I could have two.

 

[nnero]

Boy she does look rough...

 

[cgraham1]

Looks fine to me. Get it cleaned up and figure out everything you need. And flip yer pics over!

 

[nnero]

Don't know why the pics are upside down. Trying to post from phone is maddening sometimes

 

[wde_1978]

It looks like You have most , if not all of the the big parts.
I'd say dirty but decent carcass.
I would welcome a $25 carcass like that for possible future transplants.

As Clint said , clean it properly then further asses the situation.

 

[gaspipe]

They are very nice saws, you will enjoy it.

 

[nnero]

This was my project last winter. I'm ready for the challenge. Before and after:

 

[fordf150]

If you like your 6100 your going to love that when it's done

 

[cgraham1]

These saws are simple to work on. I just put one together that had the top end off. It only took about ten minutes.

 

[fordf150]

If your in need of a piston and cylinder don't be ashamed of building it as a 6400. Those cylinders can be found cheap or free and even at 64cc that saw will impress.

 

[nnero]

That's a great point

 

[mu2bdriver]

I still can't get over the weight difference between the 7900 and my 288. After a weekend of working with the latter I start looking for the former more intently. Nice job on last year's rebuild; I'm excited to see how this new one turns out.

 

[nnero]

Got the cylinder off. The piston is trashed but the cylinder looks like it can be saved. Theres still some light scoring around the exhaust port after cleaning it up but doesnt look too bad. Will def need flywheel, piston, rings, oil pump, chain brake handle, impulse line, 1 av mount, choke lever, kill switch and top covers to start. will update more tomorrow

 

[cgraham1]

What's wrong with the flywheel pictured? You better hope your coil is good... those are spendy!

I have a chainbrake handle you can have for shipping cost. I don't know where all my parts went... I thought I had more. I have a clutch and a bunch of fasteners as well. Sorry I can't be more help.

 

[nnero]

The flywheel key is sheared off. I would have checked spark otherwise. I'll pm you about the chain brake handle.