Need help with T435 issues

[JT78]

I did a search but didn't find much.
So the saw will crank and idle fine you can flip it on each side and spin it around and it doesn't change you can even lightly touch the throttle and the saw will start to rev but the moment that the bottom throttle starts to open it bogs. I'm thinking that there has to be an air leak somewhere or possibly an issue with the carb? Anybody have some experience with this top handle saw that can help shed some light?

 

[Squareground3691]

I did a search but didn't find much.
So the saw will crank and idle fine you can flip it on each side and spin it around and it doesn't change you can even lightly touch the throttle and the saw will start to rev but the moment that the bottom throttle starts to open it bogs. I'm thinking that there has to be an air leak somewhere or possibly an issue with the carb? Anybody have some experience with this top handle saw that can help shed some light?

I removed the limiter caps , so it can be adjusted properly, the muffler is very restrictive, I also opened that up like a sardine can , cut baffles out , and opened carb air intake opening , it’s a totally different saw now , did it do this all the sudden, or over time ?

 

[JT78]

I removed the limiter caps , so it can be adjusted properly, the muffler is very restrictive, I also opened that up like a sardine can , cut baffles out , and opened carb air intake opening , it’s a totally different saw now , did it do this all the sudden, or over time ?

Not my saw guy that brought it to me said it was running fine and then just wouldn't run right. I was hoping a carb rebuild would fix it but it didn't it seems to be starving for fuel.

 

[Squareground3691]

Not my saw guy that brought it to me said it was running fine and then just wouldn't run right. I was hoping a carb rebuild would fix it but it didn't it seems to be starving for fuel.

Check exhaust port and muffler not blocked by carbon build up , like I said earlier, those mufflers are terrible, check fuel filter and delivery lines , Pressure/vac test maybe

 

[JT78]

Check exhaust port and muffler not blocked by carbon build up , like I said earlier, those mufflers are terrible, check fuel filter and delivery lines , Pressure/vac test maybe

Muffler has already been opened will check the fuel lines and filter next. It seems like maybe an air leak either between the carb and boot or possibly the boot has a leak. I don't have the tools to pressure and vacuum test.

 

[Squareground3691]

Muffler has already been opened will check the fuel lines and filter next. It seems like maybe an air leak either between the carb and boot or possibly the boot has a leak. I don't have the tools to pressure and vacuum test.

MityVac a great tool, and uses

 

[David Young]

What are the carb jet settings. if they are remotely close to stock settings it would be less likely to be an air leak. what if you turned the L out 1/4 turn?

 

[JT78]

What are the carb jet settings. if they are remotely close to stock settings it would be less likely to be an air leak. what if you turned the L out 1/4 turn?

I did play with the carb adjustments and did see in the book to start about 2-2.5 turns out the saw idles beautifully but I've tried turning both screws out the L still adjusts and changes the fuel mixture but the H I've tried anywhere from 1 turn all the way to 5 and no difference I can see the bottom open up to let air in but the moment it does the saw bogs.

 

[JT78]

Won't idle correctly now only if the choke is on does it idle. Leading me to believe air leak somewhere I guess I will try to track down the intake boot and replace it and see what happens.

 

[JT78]

 

[beaglebriar]

Bad coil.

 

[JT78]

Bad coil.

Hmm I hadn't even thought of it being the coil I figured it would not work or get hot and stop working.

 

[beaglebriar]

Hmm I hadn't even thought of it being the coil I figured it would not work or get hot and stop working.

No. What you showed in the video is what happens to a coil on its way out about 99% of the time. I’d just about bet he farm that’s the issue. I’ve picked up a handful of saws real cheap that had bad coils.

 

[JT78]

No. What you showed in the video is what happens to a coil on its way out about 99% of the time. I’d just about bet he farm that’s the issue. I’ve picked up a handful of saws real cheap that had bad coils.

I learn something new every day thank you I will try the coil first and report back.

 

[pbillyi69]

is it bogging down with too much fuel or starving out?

 

[beaglebriar]

I learn something new every day thank you I will try the coil first and report back.

10-4

 

[pbillyi69]

i missed the coil post

 

[JT78]

is it bogging down with too much fuel or starvin

i missed the coil post

Acts kinda like it's starving hoping that beaglebriar is right and it's the coil of not I will just tear the whole thing down and rebuild it with a bunch of new parts.
This is the first top handle saw I've worked on and I plan for it to be the last.

 

[pbillyi69]

i have an old top handle that i got free and took apart ordered all the necessary parts to put it back together, ran out of summer to complete the project. that was two or three summers ago now. i guess summer just isnt long enough

 

[David Young]

Won't idle correctly now only if the choke is on does it idle. Leading me to believe air leak somewhere I guess I will try to track down the intake boot and replace it and see what happens.

One other thing to check is that your impulse circuit is good. Bad gasket. Gasket out of place. Hose split or off the barb.