Engine rebuild kit for the Honda CT90 Trail. Time to rebuild? If you're diving in and doing a rebuild, replacing engine cover gaskets and replacing seals this is a great kit to have on hand! The piston rings are for the stock bore.
NOTE: Does not contain the gasket for the dual range transmission, it only has the gasket for the single range transmission.
Installation Tips:
- Press your seals in straight with a seal driver or a socket with a slightly smaller OD than the seal. Both surfaces must be free of dirt to create an oil tight seal.
- All sealing surfaces for gaskets must be clean and flat to make a proper seal, sometimes non-hardening sealant is necessary.
- Be very careful when installing the cylinder over new rings, it's helpful to have the proper tool to keep the rings compressed as you lower the cylinder over the pistons. Try to use only plastic tipped tools to prevent from scratching aluminum surfaces.
- The Letter stamped on the top two rings should be facing up when installing them and stagger the ring gaps according to the manual.
Piston Ring Order:
Top Compression Ring (silver outer rim)
Second Ring (black outer rim)
Bottom Rings (3 pieces - Spacer in the middle - 1 thin ring on either side)
Fits Honda:
CT90K Trail 90 - 1966-1979
2 Reviews Hide Reviews Show Reviews
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CT90top end kit
Everything fit and worked great rings seated right up in last 5 years 4into1 has never let me down!
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Not for CT90's with Sub Transmission
I bought this kit to repair oil leaks on a 1970 Honda CT90K2. I found that the L/H Crankcase Cover gasket was not correct, it is correct for 90's without the high/low range sub transmission. The kit also does not include the sub transmission cover gasket,or the selector shaft O-ring. The kit did provide all of the proper seals for the sub transmission model. There are many other variations of gasket included in this kit that do and don't apply to the model, it a shame that it's missing these few key gaskets and O-ring. Kind of disappointing.
