Ensure any rubber coatings on the reed cage are in good condition.
PRE GAPPED PISTON RINGS MANUALS
Most service manuals will detail the acceptable clearance between the petal tips and cage as well as the stopper plate height. Reed Valve - Don’t forget to check the condition of the reed valve petals, cage, and any stopper plates. Any parts showing signs of excessive wear or damage should be replaced.
Inspect all reed valves components thoroughly before reassembling the top end. Dirt is one of the leading causes of engine wear, and limiting the opportunity for dirt to enter the crankcase is very important. Limit Contaminants - Once the cylinder has been removed wrap a clean, lint-free rag around the top of the crankcase.
PRE GAPPED PISTON RINGS MANUAL
The manual is the only place you’ll find service limits, torque specs, and other key data. Make sure you have a manual for your machine prior to starting work. Service Manual - Performing engine maintenance without an OEM factory service manual is not recommended. Let’s get started!īefore tearing your engine down, asses the specific problem with you're engine if you're rebuilding due to a running problem.ĭiagnosis - Before tearing the engine apart, are there any signs that a specific problem exists? If so, are there any diagnostic tests such as compression or crankcase leak down that are worth performing?Ĭlean Machine - Take time to thoroughly clean the machine before opening up the engine, especially if you will be servicing the top end without removing the engine from the machine. The tips we’re going to share shouldn’t be considered inclusive of everything that has to be done, but are tips that focus on things that are either often overlooked or incredibly important.
These tips will be discussed chronologically and will encompass all phases of the build from pre-rebuild prep, to disassembly, through post build. We’re going to cover numerous tips pertinent to two-stroke top end rebuilds. While two-stroke engines are relatively simple mechanical devices, rebuilding them requires knowledge of how they work, attention to detail, and a systematic approach. Hopefully, this won’t come as a surprise to you and will be part of your planned maintenance schedule versus experiencing an unplanned engine failure. Periodically, if you own a two-stroke, there will come a point where you need to rebuild the top end of your engine. Here, we go over critical steps and key tips to installing a new piston and ring(s) in your two-stroke. Rebuilding a top end is a task most two-stroke owners will run into at one point or another.
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