My buddy put it away last fall and left the gas in it. He brought it to me to fix it. Carb was plugged, and cleaning did no t help, so I replaced it. It starts, but won't run right. Bogs down when put throttle to it. Checked for exhaust plug, and noticed cylinder is visibly scored, but exhaust is open. Is this a lost cause, or is it possible it could be a good saw again? He claims it was always was a good saw, and there was no issues with it when he parked it.
Stihl MS 192T Top Handle Saw
- Thread starter ArchieBennett
- Start date
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They can be little bastards. Fuel tank vent issues, collapsed/pinched fuel lines, if you hooked the purge bulb up wrong, last running issue I had with mine turned out to be crank seals. That was a fun job. I tried aftermarket carb once and that was a no go either.
Forgot to mention that the compression feels normal, but I do not have a gauge.
Rip it down and inspect the cylinder and piston if its really scored.
Likely a new top end is needed, and most dealers charge more money to rebuild these saws than they are worth. I have saved several for replacement parts because those are not cheap either. Regardless, a visible inspection of the P/C is good advice,
This is why I always say piston and cylinder condition are more important than a compression reading.
Get it tore down. You will have to decide if the repair cost is worth it.
Get it tore down. You will have to decide if the repair cost is worth it.
True, but I still use a comp test as a guide.
Current 192 in for rebuild.
Minor piston scoring, cleaned up fine. Some cyl transfer...cleaned up but took a while.
The saw "ran" before teardown but had an obvious air leak. So pulled muffler...yup...
Waiting on seals and rings to show up...
Did some mild porting, just for fun
. Muffler mod... might tweak the timing a tad.
Backup saw for a friend.
Minor piston scoring, cleaned up fine. Some cyl transfer...cleaned up but took a while.
The saw "ran" before teardown but had an obvious air leak. So pulled muffler...yup...
Waiting on seals and rings to show up...
Did some mild porting, just for fun
. Muffler mod... might tweak the timing a tad.Backup saw for a friend.
Good old corn squeezed gas, the bane of small engines. Why I run canned gas now exclusively. Might be expensive but still less expensive than tearing one apart and replacing components. In the fall prior to laying up the lawn equipment, I drain out all the corn squeezed crap (and put it in my car) and partially refill the fuel tanks with canned gas (you can buy Tru-Fuel with no premix in it) and run them for a while and then they sit all winter in the unheated barn and in the spring, they start right up, no issue and no carb problems. Stuff is nasty and phase separates when sitting for a period of time.
Just bought an Echo CS top handle and a spare loop for a good friend as a Christmas present and along with it is going to be 2 gallons of Echo Red Armor 50-1 canned gas.
Just bought an Echo CS top handle and a spare loop for a good friend as a Christmas present and along with it is going to be 2 gallons of Echo Red Armor 50-1 canned gas.
I just got in three Stihl saws: two 193's and a192. They all have about the same symptoms. They will sometimes start and then stop dead after a few minutes or less. The primer bulb may be ether full or empty, but if empty there is no way to fill the bulb back up with numerous presses. If the bulb is full, the saw will either not start or not stay running regardless. Replacing the primer bulb or the fuel filter solves nothing.
What really bugs me is that the engine has a good spark, seems to have good compression., and installing a new carb does not solve the problem either. As Sean Donato said, these things are frustrating to say the least.
What really bugs me is that the engine has a good spark, seems to have good compression., and installing a new carb does not solve the problem either. As Sean Donato said, these things are frustrating to say the least.
Pressure test!
OK, will do, but it seems like all three saw's engines have good compression.
Bludenz
ArboristSite Member
Do you saws idle and respond well to throttle? As @lone wolf said, you need to do a pressure test. I've just done a ms192t that would start, go max rpm, and then die. Turns out the engine pan was cracked. The crack wasn't visible until the entire engine was removed.
Impulse line…and pressure/vac test
Irrelevant…
Just started 1 of 2 192 rebuilds…assembled motor and first thing…vac and pressure tested! All good…on to next step.
When I got one of them to finally run, it responded perfectly to throttle and idled fine. A week later the owner called and said the primer bulb would not fill up and he could not even start it. The two 193t's do the same thing. These saws belong to a tree service company, have all been in the trees with climbers, likely dropped all over the place, and bounced around in a truck bed. I also suspect the engine pan could be cracked as you found out.
This is really mind boggling. I have now three saws that refuse to fill the primer bulb. When the bulb is pressed, it simply brings in air and no fuel arrives from the tank through the fuel line that connects directly to the tank on one end and the carb's fuel intake on the other. Somehow the fuel is being blocked by that carb or the fuel line has a crack somewhere. Seem reasonable? Perhaps, but how could all three saws have the same trouble?
One thing for sure, unless that dry primer bulb starts filling up, the engines are not going to start. Just MHO.
One thing for sure, unless that dry primer bulb starts filling up, the engines are not going to start. Just MHO.
You anywhere near a Bermuda triangle?
