Gasket/​diaphragm Kit 99909-159

Removed the carburetor and removed the diaphragm and replaced it and the gaskets. Runs great now.

I found the video on you tube that you have on cleaning two cycle carburetors. I was able to get my trimmer running like it was new again. Thank you

did a leak down test, found head gasket leaking. opened up crankcase, removed old gasket, old seals, cleaned parts, & installed new parts. rebuilt carburetor, installed new gas tank / fuel lines & filter. made minor adjustments. installed new gas, primed carb, two pulls on starter rope, ZOOM running fine!! thanks Replacement Parts!

rebuilt carburetor with kit, changed fuel filter...28 year old weed eater runs like new! very powerful.... great step by step instructions on the video ...a monkey can do this job.... the website helped me out again... thanks

Removed carb and disambled. Sprayed parts with carb cleaner and put in new parts. put carb back on engine pumped primer and engine started right up.

I removed the carburetor the two screws behind the air filter and two fuel lines also tilt the carb to disconnect the throttle cable .Put the fuel lines back in same location when you reassemble.I disassembled the carb the four screws that holds the prime bulb and discovered the fuel pump diaphragm was hard and brittle. The diaphragm was holding the needle open causing the engine to flood. I reassembled the carburetor installing a new Gasket/ Diaphragm Kit. The trimmer runs Great !

1. Remove Carb
2. Take apart
3. Clean, Scrape off any old gasket material.
4. Replace diaphragm and gaskets and remount carb.
5. Start and test

Removed carburator, disassembled and found two small holes in diaphram. Replaced diaphram and reassembled. Unit runs fine now.

First off, I am not a certified mechanic, I, am a small engine enthusiast, and my advise is given freely, from my personal experience of repairing my own equipment. I too, continue to learn more and accept advice, thank you, and here is mine..
1. Upon trouble-shooting diagnosis, suspicion was confirmed that there was a lack of compression to the unit.(55psi) note: you need at least a minimum of 70-75psi or better, for proper compression to start the unit. In some cases, it is still possible that 70psi "may", not be sufficient. If you, do not own or have a compression tester, you, may still be able to tell if you have a compression problem simply by just on pulling the starter rope, if it pulls too freely, and with little to no resistance, chances are that is the cause, but it is always best to use a compression tester.
2. Ordered all parts through ereplacement.com!
Replacement of any internal parts on small engines is not an easy task for those who are not familiar or mechanically inclined. But it can be done. Tip: before disassembling, it is not a bad idea to take several pictures, or video, during this process. Thank me later.
3. Remove spark plug, and housing.
4. Remove carburetor and associated components.
5. Remove muffler, and ignition coil.(before removal, and since the unit was an older model, I, optioned to spray penetrating oil, onto to all bolts, nuts, etc. before putting torque into them, nothing worse than adding stripped screws n bolts during the process, but sh__ happens.
6. Removed cylinder, evidence of heat discoloration, and scarring on exhaust port side, plus piston ring had forged with piston confirmed diagnose.
7. Inspected crank and piston rod, clean out all possible debris that may have fallen inside the cavity. Blast of compressed air works very well. Advise: my opinion, should you have to replace these parts as well, it is probably better off, to just buy a new unit.
8. Removed and replaced piston(and associated components) note: rubbed piston with 2cy oil to help with cylinder installation.
9. Carefully, slide new cylinder, onto the piston, with special attention not to damage piston ring.(the top of the piston has an arrow, make sure this is pointing to the exhaust side of the cylinder). Secure cylinder to casing.
10. Attach muffler(this would be a good time to inspect and clean the spark arrestor screen, over time, they clog from improper oil mixtures and will bog the unit preventing full power), attach ignition coil(with proper gap setting, use your manual, or a business card works great).
11. Reattach carburetor and components. Note: since the unit was not used for an extended period of time, it was my option to include a carb rebuild kit into the repair.
12. Rechecked unit with compression tester, 95psi! Reassembled housing, installed spark plug. Note: prior to connecting spark plug wire, and I'm not sure whether it matters or not, but I, decided to pull the starter rope slowly(about 10 cranks), just to feel the compression and for the piston and cylinder to lube and bond.
13. Fresh gas added, and she ran like new.
Good day! I, hope this helped, and best of luck in your repairs.