Cylinder / Cylinder Head schematic Honda Ct70h Trail 70h K1 Usa

Valve guides have a hard time on these single overhead cam engines, quite often revved hard from cold, before the oil has reached the cylinder head. Smoking on the overrun, or after ticking over is indicative of worn valve guides.
It is good policy to replace these when overhauling or re-building your 50cc or 70cc engine, and of course using the genuine Honda items

The exhaust valve-guides have a much harder life than the inlet valves, but we still recommend that you renew both the exhaust and the inlet valve-guides when overhauling the cylinder head!

Cylinder base gasket, suits a plethora of overhead cam Cub derived engines, please check model application list carefully to ensure this gasket is right for your engine before placing an order.

Using only genuine Honda gaskets will help you achieve a good oil free assembly, and ensue piece of mind that you have used the best possible components when re assembling your CL50 or CL70 engine

Specifying a genuine Honda stud like this will ensure that the precision engineering is exactly as it should be giving you a real opportunity towards achieving that perfect engine rebuild!

Specifying a genuine Honda stud like this will ensure that the precision engineering is exactly as it should be giving you a real opportunity towards achieving that perfect engine rebuild!

Specifying a genuine Honda bolt like this will ensure that the precision engineering is exactly as it should be giving you a real opportunity towards achieving that perfect rebuild!

We recommend you always replace these 9.5 x 1.6 O-RINGS as a matter of course when removing and replacing the cylinder-head.
You might also like to check out our web site, for all the other parts we stock to help you on your way to a perfect rebuild or repair.

9mm rubber gasket, suits a plethora of overhead cam Cub derived engines, please this gasket is right for your engine before placing an order.
A related part you also may wish to consider.

91303035000

The importance of using the correct, genuine Honda fasteners in all areas of the machine can never be overstated!
Threads will be accurate,screws will be hardened and tempered correctly with the correct plated finish - In short it would be unwise, to say the least, to use anything other than genuine Honda fasteners!
This is the 6 x 20 CROSS-HEAD SCREW(A).

Specify GENUINE HONDA fasteners including these precision engineered DOWEL and LOCK PINS and you will be fitting the very highest quality items that will be both easy to fit and enjoy long term durability - Reusing the old items is not advisable!
This is the 8 x 14 DOWEL PIN.