Hey everyone, my first post here, so I have a MS 290 that stalls after around 5 minutes of running and no matter what will not restart until it cools down again.
So some info about the saw, I've been rebuilding it for a friends friend who brought it to someone (a dealer I guess) and was told to it wasn't worth fixing so he brought it to me to look at since I have some knowledge about small engines and a Youtube degree lol. Well anyway, had low compression so I peaked in the exhaust and piston was scored. Being the nice friend I am, lol, I told him I can rebuild it for him and he'll just have to pay for parts to make the saw like new again...
Disassembling was easy minus those rubber grommets for the Anti-vibration that holds the top plastic cover in place, so got the parts in the mail and got to work. So to make things easy I've bought the top end assembled already with the crankcase, used some high temp silicone sealant for the halves and put everything back together. Alongside with the whole engine, I've also replaced some parts that I'd think would wear down after time : Ignition Coil, Carburetor (to lazy to rebuild), Fuel filter, Air filter, Sparkplug, 20'' Bar and Chain. I've inspected all the hoses including, impulse line, fuel line, and I guess the intake boot and they all were in good shape with no cracks.
Well after finishing the puzzle of reassembly, I go to start the thing and it did take a while as I kept flooding it. Was using 32:1 fuel mixture to break in the thing, and it was a smoke machine, neighbors siding is still blue, lol. So I rev it up a bit, everything seems normal, idles ok, but sometimes it does race a bit and then go back down. After around 5 mins of running (idling) it shuts off and won't restart until it's cold again. I've tried a combination of things such as checking the fuel vent line, which is clear. Also I know it's getting fuel because I can smell it plus the plug is wet, and I also know it's still getting spark when cold and also when hot (got the burns to prove it). Over the course of like the last 4 days, I've been trying to get it running and like I said starts fine when cold, but after running for a bit it dies and won't start back up no matter what you do. I've got it all apart again on my bench looking for maybe an air leak and been going through everything. All and all, the total amount I have into the saw is $210 including the free labor. Anyway now I know next time not to fix things for a friend... who knew a 6x6 box could cause such headaches...
So once again some of the things I've checked, impulse line for cracks (none), fuel vent hose (clear), always has spark when either hot or cold, has compression of course, tried 2 different spark plugs (gapped at .020''), seems to be getting fuel, plus I'm sure there's some other things I can't think of right now. I don't have a tool to pressure test anything otherwise I would of played around with that. I've been able to get around 2 tanks of fuel ran through so far between my cold starts, and have since switched to 40:1 fuel still with the same problem.
Alright so does anyone have any idea's of what could be causing this? Sorry about my short novel lol, thanks in advance.
So some info about the saw, I've been rebuilding it for a friends friend who brought it to someone (a dealer I guess) and was told to it wasn't worth fixing so he brought it to me to look at since I have some knowledge about small engines and a Youtube degree lol. Well anyway, had low compression so I peaked in the exhaust and piston was scored. Being the nice friend I am, lol, I told him I can rebuild it for him and he'll just have to pay for parts to make the saw like new again...
Disassembling was easy minus those rubber grommets for the Anti-vibration that holds the top plastic cover in place, so got the parts in the mail and got to work. So to make things easy I've bought the top end assembled already with the crankcase, used some high temp silicone sealant for the halves and put everything back together. Alongside with the whole engine, I've also replaced some parts that I'd think would wear down after time : Ignition Coil, Carburetor (to lazy to rebuild), Fuel filter, Air filter, Sparkplug, 20'' Bar and Chain. I've inspected all the hoses including, impulse line, fuel line, and I guess the intake boot and they all were in good shape with no cracks.
Well after finishing the puzzle of reassembly, I go to start the thing and it did take a while as I kept flooding it. Was using 32:1 fuel mixture to break in the thing, and it was a smoke machine, neighbors siding is still blue, lol. So I rev it up a bit, everything seems normal, idles ok, but sometimes it does race a bit and then go back down. After around 5 mins of running (idling) it shuts off and won't restart until it's cold again. I've tried a combination of things such as checking the fuel vent line, which is clear. Also I know it's getting fuel because I can smell it plus the plug is wet, and I also know it's still getting spark when cold and also when hot (got the burns to prove it). Over the course of like the last 4 days, I've been trying to get it running and like I said starts fine when cold, but after running for a bit it dies and won't start back up no matter what you do. I've got it all apart again on my bench looking for maybe an air leak and been going through everything. All and all, the total amount I have into the saw is $210 including the free labor. Anyway now I know next time not to fix things for a friend... who knew a 6x6 box could cause such headaches...
So once again some of the things I've checked, impulse line for cracks (none), fuel vent hose (clear), always has spark when either hot or cold, has compression of course, tried 2 different spark plugs (gapped at .020''), seems to be getting fuel, plus I'm sure there's some other things I can't think of right now. I don't have a tool to pressure test anything otherwise I would of played around with that. I've been able to get around 2 tanks of fuel ran through so far between my cold starts, and have since switched to 40:1 fuel still with the same problem.
Alright so does anyone have any idea's of what could be causing this? Sorry about my short novel lol, thanks in advance.