DOLMAR/MAKITA The Official Sachs Dolmar Dolmar Makita Dolmar Chainsaws Thread

[old_sir_henry]

Zama C3M HE11 I never heard of. Factory supplied carbs were C3M DM-11A,B and C

 

[Deputyrpa]

Dang it! I just picked up a 7910 from a local guy. I had to have it. 24" oregon bar and chain. The sprocket has absolutely no wear. The piston looks new, and has lots of compression. He says it doesn't run, so it's probably a carb issue. When I looked at ir, I noticed the HI jet was missing! There's a small crack in the top of the clutch cover, a small one on the air filter cover, and another the hood. It has that funky muffler with the exhaust insert. What should I do with it?

 

[farminkarman]

Dang it! I just picked up a 7910 from a local guy. I had to have it. 24" oregon bar and chain. The sprocket has absolutely no wear. The piston looks new, and has lots of compression. He says it doesn't run, so it's probably a carb issue. When I looked at ir, I noticed the HI jet was missing! There's a small crack in the top of the clutch cover, a small one on the air filter cover, and another the hood. It has that funky muffler with the exhaust insert. What should I do with it?

Send it to @huskihl … he can get it squared away and turn it into a monster while he’s at it.

 

[Powerstroke Cowboy]

Dang it! I just picked up a 7910 from a local guy. I had to have it. 24" oregon bar and chain. The sprocket has absolutely no wear. The piston looks new, and has lots of compression. He says it doesn't run, so it's probably a carb issue. When I looked at ir, I noticed the HI jet was missing! There's a small crack in the top of the clutch cover, a small one on the air filter cover, and another the hood. It has that funky muffler with the exhaust insert. What should I do with it?

Sell it to me.

But, I would just fix the problems and have a good saw.

 

[Deputyrpa]

Pic of the 7910 piston. Nice! You can even see the cross-hatching in the cylinder. And these are the only dings on the saw. Probably repairable. the bar is almost new and the chain has been files a couple of times. It was this guy's father's saw, who passed several years ago. It looks like he kept it in the back of a truck. It was taking up space in his mother's garage.

 

[Powerstroke Cowboy]

The cylinder does look good from that shot. Good find.

 

[Deputyrpa]

The cylinder does look good from that shot. Good find.

It looks like the saw too a substantial header at some point, and that punture in the hood hid what I suspected - broken cylinder fins. It's an OEM cylinder, and appears to be original.

BTW, I don't understand how those enginerds can design a hood which requires the dismantling of the entire chain brake to get it off, and say, "Gee, we're brilliant"!

 

[Deputyrpa]

So I removed the carb, which appeared to be missing the Hi Jet screw. Lo and behold, there's a screw stud in there. It looks like one of those "Authorized Dealer Only" screws, for which I do not have the tools. The parts diagram does not show this carb with that no-touch-it setup. Did California make them do this, LOL?

 

[huskihl]

It looks like the saw too a substantial header at some point, and that punture in the hood hid what I suspected - broken cylinder fins. It's an OEM cylinder, and appears to be original.

BTW, I don't understand how those enginerds can design a hood which requires the dismantling of the entire chain brake to get it off, and say, "Gee, we're brilliant"!

It’s a little snug but the covers will come off without removing the brake handle. Spark plug boot is a pita thought

 

[huskihl]

So I removed the carb, which appeared to be missing the Hi Jet screw. Lo and behold, there's a screw stud in there. It looks like one of those "Authorized Dealer Only" screws, for which I do not have the tools. The parts diagram does not show this carb with that no-touch-it setup. Did California make them do this, LOL?

Get on Amazon or eBay and get a small engine carburetor tool kit. HIPA is decent. 8-12 pc kit is under $20. You need the DD tool

 

[Deputyrpa]

Get on Amazon or eBay and get a small engine carburetor tool kit. HIPA is decent. 8-12 pc kit is under $20. You need the DD tool

Thanks. I'm on it. Nothing gives the middle finger to EPA like some Chinesium tools.

EDIT: I got the HIPA 14-pack for $20.99. Now I have to find a Zama RB-201 rebuild kit.

 

[huskihl]

Thanks. I'm on it. Nothing gives the middle finger to EPA like some Chinesium tools.

EDIT: I got the HIPA 14-pack for $20.99. Now I have to find a Zama RB-201 rebuild kit.

Cut a Q tip on an angle and polish the needle seat with a drill and toothpaste and your flooding issues should go away

 

[farminkarman]

Cut a Q tip on an angle and polish the needle seat with a drill and toothpaste and your flooding issues should go away

Pretty cool tip I’d say

 

[Deputyrpa]

Cut a Q tip on an angle and polish the needle seat with a drill and toothpaste and your flooding issues should go away

Thanks. I use a bamboo barbeque skewer in the drill with aluminum polish.

The metering pump feels nice and sipple, and the carb internals were nice and clean. The needle pivot was slightly proud of the carb surface, so I leveled it. I really don't think this saw was used much. But it was apparently abused like a redheaded stepchild.

 

[Powerstroke Cowboy]

It looks like the saw too a substantial header at some point, and that punture in the hood hid what I suspected - broken cylinder fins. It's an OEM cylinder, and appears to be original.

BTW, I don't understand how those enginerds can design a hood which requires the dismantling of the entire chain brake to get it off, and say, "Gee, we're brilliant"!

That to bad about the cylinder. It should still run just fine though.

 

[Deputyrpa]

That to bad about the cylinder. It should still run just fine though.

Yeah. I'm not going to sweat it. If I have doo-diddley time I'll grind and TIG on some fin pieces from one of the junk jugs I have. I seriously doubt that saw has 10 tanks through it. It looks pristine inside. It's even hard to find any wear on the clutch sprocket.

 

[Deputyrpa]

So I put the 7910 back together enough to run it, put fresh fuel in it, and gave her a pull. She fired right up! Pushed the choke in and she raced like a mofo. Then the chain brake link pin fell out and she locked on the clutch. It's not a marvel of enginerding that these saws have the spring under tension when the brake is disengaged. I shut her down after only a wisp of clutch smoke. After scouting the dirt with my magnetic broom, I finally found the little bugger pin, and then put the plastic cover on to keep it in place. Lesson learned from being too ....uh....stimulated. Looking closely at the carb, I noticed that the throttle cable seemed short, as the throttle arm was not even close to being at rest on the idle screw. So I disconnected the cable from the carb and she ran great after some idle and L adjustment. I revved it manually, and it took some time to rev down. Perhaps it was because I had no air filter or muffler on it. Or may be sucking air somewhere. I will attack that tomorrow. But I'm stoked that it runs readily.

 

[Powerstroke Cowboy]

Get it running right with a gutted muffler and a bigger port you will be smiling for sure.

Or do a complete port job and the grin will never leave.

 

[av8or3]

Get on Amazon or eBay and get a small engine carburetor tool kit. HIPA is decent. 8-12 pc kit is under $20. You need the DD tool

That stud he’s talking about is the H needle and it might not be adjustable. It actually appears to be non-adjustable to me. Nothing there to grab ahold of. The 026 Pro had a non adjustable High side, but I don’t remember how this looked on it.

 

[av8or3]

That stud he’s talking about is the H needle and it might not be adjustable. It actually appears to be non-adjustable to me. Nothing there to grab ahold of. The 026 Pro had a non adjustable High side, but I don’t remember how this looked on it.

At the expense of appearing stupid, I just realized how that little “stud” works. Indeed, the double D will work. If I remember (now) correctly, the tool slides down over the round head pushing down on a spring before engaging the double D part of the needle. I’ve seen it before , once on my Solo 656. Was only trying to be helpful.