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Started By
Message
2 cycle gas weed eater repair advice needed
Posted on 6/24/19 at 6:34 pm
Posted on 6/24/19 at 6:34 pm
i have a troy built tb35ec trimmer that doesnt want to start. i replaced the carb since it sat up for a while and put in a new spark plug because old plug had a weak spark. it didnt want to start or even try to start.
thinking the cylinders were dry from sitting up for a while i added a few squirts of oil through spark plug hole and it felt like it had a bit more compression to it and then she actually fired up and ran for a minute but died right away and refused to start up again.
after letting it sit for an hour, i tried again and it started and ran for about 2 minutes filling the garage with smoke before it lost power and died.
it never would start again after that. i tried another new carburetor i had on hand (they sent me two by mistake) just in case but it made no difference.
it wont even spit or try to start with starter fluid so im thinking that eliminates a fuel problem and i have lots of spark. i put new plug and triple checked it many times to be sure its clean and sparking good throughout all this BS.
i tried two different brand new carburetors so that should eliminate any carb related issues. when i tried to repeat what i did the first time, adding a bit of oil directly to cylinder to increase compression, it didnt even spit or try to start at all.
it did start and ran for a short while, so im thinking this has to be something simple.
i am in this until the end with this thing and refuse to be defeated but i dont know what to test next. i usually fix these things for other people, but this one isnt a simple carburetor or fuel filter issue. it has spark and its getting gas, and it has "some" compression albeit hard to tell how much.
dont all 2 cycle engines have reed valves on them? where is the reed valve? im thinking that would be the next logical thing to check but i dont see it shown on any parts list diagram.
thinking the cylinders were dry from sitting up for a while i added a few squirts of oil through spark plug hole and it felt like it had a bit more compression to it and then she actually fired up and ran for a minute but died right away and refused to start up again.
after letting it sit for an hour, i tried again and it started and ran for about 2 minutes filling the garage with smoke before it lost power and died.
it never would start again after that. i tried another new carburetor i had on hand (they sent me two by mistake) just in case but it made no difference.
it wont even spit or try to start with starter fluid so im thinking that eliminates a fuel problem and i have lots of spark. i put new plug and triple checked it many times to be sure its clean and sparking good throughout all this BS.
i tried two different brand new carburetors so that should eliminate any carb related issues. when i tried to repeat what i did the first time, adding a bit of oil directly to cylinder to increase compression, it didnt even spit or try to start at all.
it did start and ran for a short while, so im thinking this has to be something simple.
i am in this until the end with this thing and refuse to be defeated but i dont know what to test next. i usually fix these things for other people, but this one isnt a simple carburetor or fuel filter issue. it has spark and its getting gas, and it has "some" compression albeit hard to tell how much.
dont all 2 cycle engines have reed valves on them? where is the reed valve? im thinking that would be the next logical thing to check but i dont see it shown on any parts list diagram.
12
Posted on 6/24/19 at 6:45 pm to keakar
Air spark fuel and in correct time it will run
It’s a 2 stroke there may be a keyway that has sheared and it’s out of time but I seriously doubt that’s it check the coil how close is it to the flywheel? move it as close to the flywheel like business card thickness or closer without hitting the flywheel are the fuel lines correct one should be a over flow vent and one is the fuel supply.
It’s a 2 stroke there may be a keyway that has sheared and it’s out of time but I seriously doubt that’s it check the coil how close is it to the flywheel? move it as close to the flywheel like business card thickness or closer without hitting the flywheel are the fuel lines correct one should be a over flow vent and one is the fuel supply.
Posted on 6/24/19 at 6:53 pm to Cracker
quote:
Air spark fuel and in correct time it will run
It’s a 2 stroke there may be a keyway that has sheared and it’s out of time but I seriously doubt that’s it check the coil how close is it to the flywheel? move it as close to the flywheel like business card thickness or closer without hitting the flywheel are the fuel lines correct one should be a over flow vent and one is the fuel supply.
its got a nice blue spark so coil and plug are good
since it did run, im assuming the flywheel key way is good, but timing being off is a very good thought, i just rather not strip it all down completely that far just yet.
i have a new tank assembly complete with hoses cap and filter coming in at the end of the week for another trimmer but they are the same parts so i will try replacing the whole thing and see. maybe something isnt right but the cap vent seems ok and i replaced the fuel lines and filter so those are new
this was "supposed to be" a running unit that was left sitting up with gas in it over the winter and then wouldnt restart. so it has an unknown history. he had 2 of them, a craftsman and a troy built, the craftsman needed a new carb and runs great now but the gas cap vent leaks gas so thats why i ordered the new gas tank assembly
This post was edited on 6/24/19 at 6:57 pm
Posted on 6/24/19 at 8:27 pm to keakar
Check the fuel filter.. Take it off and see if it runs.
Might as well check the air filter..
Check fuel lines..
Might as well check the air filter..
Check fuel lines..
Posted on 6/25/19 at 12:47 am to keakar
well im not sure how true it is, but i saw a comment online saying they need to have 90-150 lbs compression.
just holding my finger over the plug hole while pulling the rope it sure doesnt feel like it has that much but i need to find a compression tester to see what its actually reading
just holding my finger over the plug hole while pulling the rope it sure doesnt feel like it has that much but i need to find a compression tester to see what its actually reading
Posted on 6/25/19 at 7:06 am to keakar
Quick lesson entry level 2 stroke products most companies have them. This why the flood easily. That why when it says prime x amount times prime x amount of time. TB 35 10 times. Crank 3 to 4 times in Choke. When shows wants to run take out of choke crank one or two times should start. A lot of people keep cranking causes flooding.
The piston flat no reed valve.
The idea is prime correctly 10 times and fuel on top of piston.
Easy to flood as fuel can bypass piston and go exhaust.
Some companies put curve on top of the piston to block exhaust usually higher priced 2 banger.
If it runs shows that when fuel & air get in you have the combustion.
I have the access to the service manual and will look over it.
The piston flat no reed valve.
The idea is prime correctly 10 times and fuel on top of piston.
Easy to flood as fuel can bypass piston and go exhaust.
Some companies put curve on top of the piston to block exhaust usually higher priced 2 banger.
If it runs shows that when fuel & air get in you have the combustion.
I have the access to the service manual and will look over it.
Posted on 6/25/19 at 8:40 am to keakar
Take this opportunity to get yourself an Echo SRM 230 and run only trufuel thru it. No need in draining the tank at the end of cutting season since trufuel has a shelf life of over 2 years and won't gum up your carb.
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Posted on 6/25/19 at 11:10 am to keakar
Not to derail your thread, but my blower basically did the same thing last weekend. I was blowing off driveway and when I was almost finished, the blower was idling and just kind of petered out like it ran out of gas. I went to fill it up and the tank was still 1/2 full.
I dumped that Truefuel out and refilled it. Then nothing.
Took the plug out and it's firing but replaced anyway.
Took muffler apart to make sure it's not cogged.
Couldn't even get it to fire off once even using starter fluid.
I replaced the carb with a new one I had laying around for an old weed eater. I'm not 100% sure they're the same part number, but the size and fuel line attachments were identical.
Still nothing.
It has not even attempted to start since it died the first time.
I'm usually pretty handy with these small engines, but it's got me stumped.
I dumped that Truefuel out and refilled it. Then nothing.
Took the plug out and it's firing but replaced anyway.
Took muffler apart to make sure it's not cogged.
Couldn't even get it to fire off once even using starter fluid.
I replaced the carb with a new one I had laying around for an old weed eater. I'm not 100% sure they're the same part number, but the size and fuel line attachments were identical.
Still nothing.
It has not even attempted to start since it died the first time.
I'm usually pretty handy with these small engines, but it's got me stumped.
Posted on 6/25/19 at 1:44 pm to johnnyrocket
quote:
Quick lesson entry level 2 stroke products most companies have them. This why the flood easily. That why when it says prime x amount times prime x amount of time. TB 35 10 times. Crank 3 to 4 times in Choke. When shows wants to run take out of choke crank one or two times should start. A lot of people keep cranking causes flooding.
thanks for the help
the design with this troy built carb is it has no choke, none at all, it simply cracks throttle open about 1/4 for starting. see it here LINK
i followed start instructions exactly but it never acts like it even tries to start, not in the least bit, and pulling is super super easy with little to no resistance at all like you normally would feel a thump thump from the compression.
the one time i did get it to start was only after i put a few tablespoons of 30w oil directly into the cylinder to see if it was a compression issue and it started and ran just long enough to blow all that oil out and then died.
i have a compression gauge "somewhere" i really have to go dig it out to see what its showing to confirm the engine is or isnt good.
i rarely do compression tests because my history with small engines is its going to run or the engine is bad so if a new carb or fuel filter issue cant fix it its in the bin.
This post was edited on 6/25/19 at 1:46 pm
Posted on 6/25/19 at 1:49 pm to REB BEER
quote:
REB BEER
a really common issue is the fuel filter gets clogged
pull the fuel lines off the carb and blow into them
one is just a return line for priming the carb and just goes a short way into the tank
the other one has the filter so blow in it and you should be able to blow through it without much resistance
i bet your fuel filter got clogged, just to test you can run it just for a second without the filter to test if thats it
Posted on 6/25/19 at 1:51 pm to keakar
I’ve never had to crank my RoundUp and sprayer. Seriously, two-stroke engines are the devil.
Posted on 6/25/19 at 2:07 pm to keakar
does it have reed valves?
Posted on 6/25/19 at 2:08 pm to keakar
quote:try to pour some yamaha ring free and see if it unsticks the rings on the piston.
the one time i did get it to start was only after i put a few tablespoons of 30w oil directly into the cylinder to see if it was a compression issue and it started and ran just long enough to blow all that oil out and then died.
Posted on 6/25/19 at 2:56 pm to keakar
quote:
i bet your fuel filter got clogged, just to test you can run it just for a second without the filter to test if thats it
I'll give that a shot. I just thought it would at least fire up for a short time using the starter fluid.
Posted on 6/25/19 at 2:57 pm to keakar
Be like me and give up and get an echo srm/pas 225
Posted on 6/25/19 at 3:26 pm to REB BEER
quote:it will if there's correct timing,spark and compression. Always.
I just thought it would at least fire up for a short time using the starter fluid.
Posted on 6/25/19 at 4:37 pm to Bedhog
quote:
does it have reed valves?
i see some do but not all, which seems odd, i thought they all did but apparently not im finding out.
i dont know for sure how interchangeable or even repairable the engines are as far as finding parts because there are no internal engine part number or parts sold anywhere for them.
the TB35EC is a pretty old model
This post was edited on 6/25/19 at 4:56 pm
Posted on 6/25/19 at 4:41 pm to keakar
I went EGO Battery for this and Blower for just this reason.
Posted on 6/25/19 at 5:06 pm to keakar
I came up empty looking to see if your motor hat them as well. I had no clue there were 2 strokes without Reed valves.
This post was edited on 6/25/19 at 5:06 pm
Posted on 6/25/19 at 5:11 pm to Bedhog
well shazbot, i cant find it anywhere so i ordered a new compression tester
i bet i find the other one as soon as the new one arrives, thats how it usually works lol
i know right, i though 2 strokes required a reed to work but someone said some brands they design the cylinder in a way to work without it.
i see some have them on the rear cover and some have them on the back side of the carburetor mounting blocks, but this one doesnt show one anywhere, its weird
i was surprised it didnt have a choke either, on some like this one the throttle butterfly is also the choke
i bet i find the other one as soon as the new one arrives, thats how it usually works lol
quote:
I came up empty looking to see if your motor hat them as well. I had no clue there were 2 strokes without Reed valves.
i know right, i though 2 strokes required a reed to work but someone said some brands they design the cylinder in a way to work without it.
i see some have them on the rear cover and some have them on the back side of the carburetor mounting blocks, but this one doesnt show one anywhere, its weird
i was surprised it didnt have a choke either, on some like this one the throttle butterfly is also the choke
This post was edited on 6/25/19 at 6:19 pm
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