Its pretty nice just swapped the bar out and it is missing the bushing and the screw for the brake handle but that’s already on its way in the mail
You guys have really been a bad influence on me I just quick pulled the muffler to see the piston and cylinder, which are spotless by the way and it took all my willpower to not grab the dremel and tear into the cylinder and muffler Now I’m on the fence about staying stock or not.... Sporting the new bar
Nixon do those 7910 cylinders run with the same carb as the stock 6400 or do you need to go to a 7910 carb or are they one in the same?
same carb . You have to gut the cat out of the muffler to let it breathe ,and lose about 4-6 oz in the process . Full disclosure , I don’t know what the power difference is ,as I never ran the 6400 before I gutted the muffler ,and installed the 7910 P&C . I then put it in a box and shipped it to MM before running it . Probably need to get councelling ,as I do that fairly often .
I have only started this one twice... once this morning I’m the garage at 615 am before work so I could wear some two stroke cologne and then this afternoon to put my tach near it just out of curiosity idled at ~3100 and wot burbled between 12,9 and 13,2 when she would clean up. Anyway I’m ready and itching to tear into it, but I’m going to try and make a few stock test runs and tune it good as stock first.
something that I forgot was a difference . The coil in the 6400 is limited to 13.5 k ,in the 7910 ,I think it’s 12.8 ,or something close to that . So,you get a few more rpm before hitting the limit when you convert to 7910 plus a stainless steel can vs plain steel .
Yes, you use the same carburetor when going up in displacement. You do need to return it, but you'd need to do that if you muffler modded it too. 6400 is 4.7 HP, 7900 is 6.3 HP. Non muff modded stock numbers.
Re tune, not "return" the carb in my post above. FWIW the Stihl Magnum 460 is 6 hp. It's no wonder why guys like the 7900. The 460 is a great saw, my buddy has one and I used it for a day last winter. It just looks like the Dolmar 7900 is a little better. Heck, my stock 6421 dolkita didn't seem too much less than the 460 from my initial impression.
Cleaned her up and sorted through the chains this morning. Unfortunately had to toss 4 of them but ended up picking out one and filing it up so be prepared for a test run later.
I really like my total/tsumara bars. They seem to hold up really well. But I don't get as much use as I like.
28-2900 idle 13200-13300 wot 9800-10000 light load in cut and 8600-8800 really leaning on it. 20” 3/8 .050 full chisel. I think it’s a good match with the 20 and there’s a good chance of some tinkering in the near future
Late to the thread but I run a Dolmar 6400 with a 24" Oregon B&C. I got mine with only a couple hours on it, it was a "bought it, don't like it, traded it in" deal. Mine will bog occasionally when the full bar is buried, but that's likely my fault. I am planning on upgrading to the BB kit and having a muffler mod professionally done, as soon as I can scrape up the coin. I want this to be my "big" saw and I will be putting something in the 60cc class into the lineup when that's done.
I couldn’t resist followed a little post from Barcroftb and split the can Close up of the cage beforehand After some grinding, I decided to leave some of the baffle so the exhaust didn’t blow directly at the muffler can weather or not it was necessary Opened the outlet port leaving the screw hole for the screen if I ever wanted to put it back on. The stock opening almost seemed like they punched it since there was a bunch of material that was inside the can (look at the second pic upper right) Baffle back in, I also opened the inlet to match the cylinder exhaust port as well as this plate on the baffle and the gasket so it’s all the same size cold crimped it back together with some pliers then used a drift and ball pien to tighten it up
