(This post has been pulled from another unrelated thread. I'd like to delete it from the other location if possible.)
The saw will start and idle. It will not rev from a dead idle, but if I bump it, it will rev afterwards or from a higher RPM. The longer it idles, the more difficult to get it to rev. It will not start or run with a new or old air filter on, at all. (See video below)
I checked the plug(and replaced it), muffler, clear. I replaced the fuel/impulse lines, fuel filter, and cleaned the carb without a full rebuild first. I disconnected the tank vacuum and tested too, to make sure it wasn't clogged. I found a cheap aftermarket carb to test with, and adjusted both carbs per specs, no luck, same results. My compression gauge shows 120psi. After thinking I had a muffler issue, I opened it up. Same results. I finally rebuilt the HD-18c carb with a kit, cleaning all the passages thoroughly with carb cleaner & brushes. I did a vacuum test on the carb, and it held fine at 10psi. I pressure tested it with a regulated compressor @ 10psi and submerged it in water. No leaks. I've verified the carb needle lever is flush with the Walbro housing more times than I want to admit. It's good.
I do need to pressure test the saw itself, but I accidentally ordered the mv8000 vs the mv8500, so I didn't have that option. The 8500 is on the way.
Here's a poor quality video of how the saw acts: HERE
In the video I am adjusting the L&H back to the 1/4 & 3/4 recommended turns. I actually close them all the way, then open them back up WHILE the saw is idling. You can see it hardly had an impact. Air Leak? It just seems to have a lot of extra fuel blowing back out of the carb.
Thanks for any advice/help you can offer. This newb really appreciates it. ;-)
The saw will start and idle. It will not rev from a dead idle, but if I bump it, it will rev afterwards or from a higher RPM. The longer it idles, the more difficult to get it to rev. It will not start or run with a new or old air filter on, at all. (See video below)
I checked the plug(and replaced it), muffler, clear. I replaced the fuel/impulse lines, fuel filter, and cleaned the carb without a full rebuild first. I disconnected the tank vacuum and tested too, to make sure it wasn't clogged. I found a cheap aftermarket carb to test with, and adjusted both carbs per specs, no luck, same results. My compression gauge shows 120psi. After thinking I had a muffler issue, I opened it up. Same results. I finally rebuilt the HD-18c carb with a kit, cleaning all the passages thoroughly with carb cleaner & brushes. I did a vacuum test on the carb, and it held fine at 10psi. I pressure tested it with a regulated compressor @ 10psi and submerged it in water. No leaks. I've verified the carb needle lever is flush with the Walbro housing more times than I want to admit. It's good.
I do need to pressure test the saw itself, but I accidentally ordered the mv8000 vs the mv8500, so I didn't have that option. The 8500 is on the way.
Here's a poor quality video of how the saw acts: HERE
In the video I am adjusting the L&H back to the 1/4 & 3/4 recommended turns. I actually close them all the way, then open them back up WHILE the saw is idling. You can see it hardly had an impact. Air Leak? It just seems to have a lot of extra fuel blowing back out of the carb.
Thanks for any advice/help you can offer. This newb really appreciates it. ;-)