I tried to start my troy vac/blower and it takes for ever to start and when i used the vacuum it runs slower and finally stalls and wont start backup

Here is a Link to one pf my Tips:

www.fixya.com/support/r6081405-cleaning_small_engie_carburetor

Good Luck!

Jim

If you ran it without oil, the piston and/or cylinder is scored so badly it won't build enough compression to fire. A few of these are worth repairing but usually cheaper and easier to buy a new one.

souds like it could be flooding out at full revs check the choke is fully closed

This would indicate that you need a new diaphram in the carby not very expensive any mower shop will do for about $30

I'd say the carb is clogged somewhere, probably the main jet. The gas today is terrible. Removal/replacement may be the (only) way to go.

First I would check your fuel filter in the tank. They use a sintered type that clogs easily then allows dirt to get into the internal screen in the Zama carb, if the filter is clean and whole I suggest to take the carb out and clean it. Remenber to only use starting fluid to clean the internal parts, as carb cleaner will melt the internal check valves and ruine the carb. Dont be afraid to take the carb apart, its not brain surgery, just start with a nice clean shop cloth and lay it out as you take it apart. The screen I am referring to is on the metering diaphragm side, thats the side with one screw on it

NOPE You can buy new cheaper than have this one repaired, Also I don't recommend using these for a vac on leaves. Leaves are very very dirty and these blower vacs usually dont last long when used as a vac. The seize problem was from an improper fuel mix. THE next one you getone use a little more oil, than says in the owners manual. Like if it says 50/1<<>> mix 40/1 more oil will just foul the plug and oil the muffler,but you will not have a seizure problem. I have never had a problem with a 40/1 mix .

It seems to be a usual problem with troy bilt trimmers and leaf blowers. There should be a half moon piece of keystock that holds the flywheel on,sometimes its known to sheer off. Could also be one of the keepers that hold back the plastic disk for the cord comes loose,it gets in a bind. Either way,you have to open up the case and see whats going on.

All of these "starting/running" issues are similar and related directly to one cause. It was suggested several times that the muffler may be plugged, but mine was found clean during a complete teardown. Cab cannot be blamed either, since the fuel filter wouldn't be able to pass anything large enough to foul an orfice.
Very common issue with hot running two cycle engines...ring fouling and loss of compression. The brand or type of oil must be scrutinized, and the mixture kept exact. I would never use anything but Echo or manufacturers recommended oil in these units ever again.

Check the safety switch where the vacuum tube connects to the unit or disconnect Ignition switch to find failure. (Never operate unit with safety switches disconnected!)