Thread: Hydramaster 3.2 Vacuum Loss Caused by Engine

does it have belts? just curious.. i dont know anything about those machines

i would also check your throttle cable, choke, and where the throttle cable controls the engine, maybe a screw rattled loose or something. also check your air filter.

if the engine sounds fine and you are only losing vac, i would inspect everything in/around the blower. does it have a preheater? did you check the filter in your waste tank? we have had vac issues before, and stuffed a hose in the vac inlet from the machine and pushed out little pieces of wood or debris that were wrapped with hair and everything else.

I had a little problem like this with my 4.0 and it ended up being my throttle cable. It was broken, and I had to manually pull the throttle on the carburetor to find it. Just start at the engine and try to trace everything backwards? Something will pop up.

Good luck and let us know if you find anything.

Sounds like fuel to me? Look at you're fuel filter and or the fuel pump. You already have spark (engine is running) so I would bet on not enough fuel to supply the higher rpm's.

Originally Posted by bayareasfinest

The engine is running fine but it sounds a Lil like its bogging the engine is not running right the throttle cable is good I checked the choke and it seems to run the same with it open or closed so I don't know the carburator looks clean I changed the spark plugs nothing yet

How can the choke do nothing? Did you check to see if the butterfly was moving when you pull the choke? If that butterfly closes and nothing happens you have one serious air leak at the intake.

Yea the choke closes and opens I checked it with the intake filter off so it works. So the leak should be under the carburator? I don't know the engine sounds like its not gettin enough gas or air ? ...almost like a misfire inside the engine? What should the spark plugs be gaped at? I looked at the manual with no luck. And could the spark plug wires be bad? :( I dont know

has the blower been lubed, oil in the resevoir, greased? just checking what would slow the engine down bearings seizing up? and of course check the fuel filter, and throttle linkage some of those are more or less like a choke cable locked down with a screw and if the screw backs out. the outer casing will slide forwards vice versa..

Non of us are going to be able to diagnose your problem. All were doing is throwing darts at what seems like logical answers. If one of your plugs is black thats a rich mixture right there. Not even really a big deal unless its caked with black sooty deposits. For instance when I said if your choke is closed and no reaction theres a leak. Spray starter fluid/ether at the neck of the carb to see if rpm's raise. Or maybe your linkage is binding not able to move into high rpm. Honestly I think it may be about that time to take it to someone who knows how to fix truckmounts. No disrespect at all just thinking about what is the most reasonable thing to do at this point. And who knows it may be something so obvious and easy to fix. I'm sure one of us has actually hit the nail with all of these suggestions. Good luck Stavros! I hope you find the problem.

I took it all apart and i seen that the air filter looked oil saturated so i ran it without it. I took a video of it, as i revved the engine up i could see unburned fuel splashing in little bits at the carburetor top. So i think i'm drowning my engine with gas. I looked at the coil packs and they do look pretty old. See the video and tell me what you think. The sound is horrible on the video since i recorded with my phone and the engine is loud :P

A couple things could be wrong. Either your running way too rich or your valves are not seating properly or your duration is off. Duration is the amount of time the valve stays open on the cam lobe. Have you tried to adjust the air/fuel mixture? If your float was sticking or set too high you would see fuel come out of that curved open tube which is an overflow tube. What is happening is your putting more fuel into the chamber than capacity allows. When your piston is traveling up it is pushing out excess fuel before the valve closes. Lets say your coil was bad and your air/fuel was fine....unburned fuel would pass through the head and out the exhaust valves in a normal manner much like a water pump. So i think your coil is fine. Black spark plugs is also an indication of a rich mixture like I mentioned in a post above.

Originally Posted by bayareasfinest

How do I set the duration? I seen a plug in front of the carburator that turns from left to right is that it?

Your looking to set air fuel mixture. I suggest taking it to a service center.

Originally Posted by bayareasfinest

How do I set the air and fuel ratio? There's no repair shops that work on this type of machines in my area. The only one is 3 hours away

definately take it to a lawn mower repair shop, they will know exactly what to do, and it will cost you 1/4 the price of a service at a shop that specializes in truckmounts