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Repair Parts Home  Lawn Equipment Parts  Ryobi Parts  900953001 Cylinder Gasket

Cylinder Gasket

Part Number: 900953001
RyobiHomeliteRidgid
Availability: 25+ in stock
Price: $4.16
Quantity:
Order within the next 13 hours
and your part ships today!

*This part replaces obsolete part #: 4388, 04388, 98764, UP03857, 985259001 and 04388B.

Description:
This item has been OEM sourced and is intended to be used with gas-powered trimmers and pruners from Ryobi & Homelite. The gasket is used to seal the connection between the cylinder and the crankcase. It is recommended to replace gaskets when servicing the motor to ensure proper seals and spacing when the parts are reassembled. This item is priced as a single part.
Product Information
Manufacturer: Ryobi, Homelite, Ridgid
Product Number: 900953001
Classification: Part
Weight: 0.01 lbs.
Shipping: Ships Worldwide
Related Products
Compatibility

This part is compatible with the following machines:

Ryobi
Homelite

Products Compatibility

This item works with the following types of products:

  • • Blower
  • • Grass Trimmer
  • • Hedge Trimmer
  • • Pruner
  • • Trimmer
Questions & Answers

No questions have been asked yet
Repair Instructions: Submitted by Customers Like You
1 of 1 people found this instruction helpful
Tool Type:
Trimmer
Parts Used:
Gasket - 900954001
Cylinder Gasket - 900953001
Piston Ring 30CC - 690161005
Carburetor Gasket - 984834001
Intake Gasket - 985248001
Repair Difficulty:
Medium
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Pliers, Socket set, Torx drives
Low compression, wouldn't start
1. Disassembled clutch and powerhead
2. Removed piston rings,
3. Cleaned piston and installed new rings
4. Lubricated piston, rings and wrist pin bearing
5. Cleaned all gasket surfaces and installed new gaskets
6. Reassembled power head and clutch assy
7. Compression restored and trimmer runs great
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Tool Type:
Trimmer
Parts Used:
Cylinder Gasket - 900953001
Piston Ring 30CC - 690161005
Cylinder, 30CC - 640841008
Repair Difficulty:
Easy
Time Spent Repairing:
30-60 minutes
Tools Used:
Socket set, Wrench Set, Nutdriver
Piston froze in cylinder
10 year old Ryobi
Took engine off from unit
2 Cleaned unit and engine
3 Freed piston from cylinder
4.Removed cylinder from unit and piston
5.Check wear and connecting rod , crank
6.Removed piston rings from connecting rod and installed new piston rings
7.Installed cylinder engine base and reassembled, tested .
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Tool Type:
Trimmer
Parts Used:
Cylinder Gasket - 900953001
Piston Ring 30CC - 690161005
Repair Difficulty:
Expert
Time Spent Repairing:
More than 2 hours
Tools Used:
Screwdriver, Pliers, Socket set, Wrench Set, Nutdriver, Cylinder bore hone; Red Scotch Bright pad, cleaning Solvent
Blue Exhaust Smoke
Disassembled trimmer shaft assembly from motor assembly.
Disassembled motor, leaving flywheel and magneto in place, and then removed cylinder jug with piston in place.
Removed piston and push rod assembly from cylinder but did NOT disassemble connecting rod from piston as it was not necessary for this repair.
Completely cleaned and inspected ALL parts, paying particular attention to cleaning the roller bearing in the connecting rod to the crankshaft.
Lightly honed cylinder bore to remove carbon deposits. I could not do a thorough honing to the cylinder wall due to intake and exhaust passages. I used a brake cylinder hone for this task and I feared damaging these passages and the honing stones. I did use a variable-speed battery-powered drill to turn the hone but was careful to keep the stones inside piston-running area and away from the passages.
Removed old piston rings; cleaned off all carbon deposits from piston head and removed oil varnish deposits from piston side with Scotch Bright pad until bright.
Installed new piston rings.
Applied light coat STP oil treatment to piston, rings, cylinder wall and roller bearing, and CAREFULLY reinserted piston assembly back into cylinder jug.
Replaced all gaskets.
Reassembled motor.
Reassembled motor to trimmer shaft assembly.
Started and adjusted fuel/air mixture.
At this time there is no notable exhaust blue smoke.
This job requires more than just rudimentary skills and knowledge because you'll be working with a piston, rings and a cylinder. One tool you really won't need for this job is a torque wrench. It will be very helpful to also have a printed exploded-view parts diagram to help in parts orientation during reassembly. (I had to obtain and print a much clearer copy from another website - the one from the parts list on ereplacementparts.com is of poor quality). You'll also need a safe cleaning solvent and brushes, protective gloves, eye protection and a well-ventilated work area, and insure you have a fire extinguisher nearby while working with solvent. I also recommend having adequate bench space and parts bags or boxes. I used Ziploc Snack Bags for the removed hardware and I labeled them with a Sharpie pen.
Okay. Good luck and have fun.
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Tool Type:
Blower
Parts Used:
Cylinder Gasket - 900953001
Repair Difficulty:
Hard
Time Spent Repairing:
1-2 hours
Tools Used:
Screwdriver, Wrench Set, Torx driver
Couldn't adjust carb replaced fuel filter cylinder base gasket was blown
1. Removed engine cleaned engine of dirt so it didn't get inside engine
2. Removed cylinder with piston in it had good comp. so I left the piston in
3. Removed old gasket and cleaned gasket surface. Taking care not damage piston or get stuff inside the cylinder or crankcase.
4. Replaced gasket
5. Reassembled the blower.
6. Started and re-adjusted the carb.
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Gas/oil mixture leak. hard to start.
I basically rebuilt the trimmer, replacing all available gaskets and fuel lines and filter. I also removed some carbon buildup from the top of the piston and inside the combustion area. I found a damaged clutch during the breakdown and was lucky enough to find one elsewhere since it is a discontinued part. I viewed some repair tutorials from ereplacementparts for areas where I wasn't sure what to do, like, how to remove the drum and broken clutch. Which I needed to purchase a new tool for. A 4" T-25 driver. They were very simple to understand as well as the useful knowledge they contained.

My Ryobi is 11 years old this year with me as the only owner and now its runs like new again.
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Tool Type:
Trimmer
Parts Used:
Cylinder Gasket - 900953001
Muffler Gasket - 900994006
Repair Difficulty:
Medium
Time Spent Repairing:
1-2 hours
Tools Used:
Screwdriver, Socket set, Nutdriver
String trimmer kept dying on use, leaking gas, compression seemed weak plug cylinder fouled badly
1. Disassembled cylinder block & removed gaskets hoses rings etc.
2. Cleaned housing & carburetor.
3. Installed new hoses gaskets rings reassembled used lock-tight on threaded bolts to cylinder housing.
4. Rebuilt carburetor with kit & changed plug.
5. Ran trimmer adjusted carburetor.
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Tool Type:
Trimmer
Parts Used:
Gasket - 900954001
Cylinder Gasket - 900953001
Carburetor Gasket - 9074002
Repair Difficulty:
Medium
Time Spent Repairing:
15-30 minutes
Tools Used:
Screwdriver, Socket set, Wrench Set
Oil leaks due to gasket failures.
Removed the enclosures, covers, fuel tank, carb., muffler, then removed the crankcase cover and the cylinder. Cleaned the gasket areas well then reinstalled the parts with the new gaskets in place. Engine ran well with minor adjustments to the carb. This unit was less than two years old (50 hrs.max usage) and no hard use when it failed. No other problems have occurred, so I thought the repairs were the proper course of action, being that a new unit retails for $229.99.
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0 of 1 people found this instruction helpful
Tool Type:
Trimmer
Parts Used:
Carburetor Gasket - 900994004
Gasket - 900954001
Cylinder Gasket - 900953001
Drum And Connector - 308177001
Rotor W/Starter Pawl - 300952002
Repair Difficulty:
Medium
Time Spent Repairing:
1-2 hours
Tools Used:
Screwdriver, Socket set, Nutdriver, Tork bits
Drum worn out and split starter pawl spring broke leaked oil
Remove and replace and watched videos for tips.
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Discussion
Discussion for Cylinder Gasket - ( 900953001 )
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