Remove the spark plugs (page 3-6).
Remove the spark plug sleeve on the cam chain side using the holder attachment.
![](https://motoinstruction.ru/img/honda/9/115817.jpg)
Tool: Holder attachment 07930-KA50100.
Front cylinder:
Remove the front cylinder head cover (page 8-3).
Rotate the crankshaft clockwise and align the "FT" mark on the primary drive gear with the index mark on the right crankcase cover.
![](https://motoinstruction.ru/img/honda/9/115818.jpg)
Check that the index lines on the front cylinder camshaft are flush with the cylinder head surface and "F" and "R" marks facing as shown (TDC).
![](https://motoinstruction.ru/img/honda/9/115819.jpg)
Rear cylinder:
Remove the rear cylinder head cover (page 8-3).
Rotate the crankshaft clockwise and align the "RT" mark on the primary drive gear with the index mark on the right crankcase cover.
![](https://motoinstruction.ru/img/honda/9/115820.jpg)
Check that the index lines on the rear cylinder camshaft is flush with the cylinder head surface and "F" and "R" marks facing as shown (TDC).
![](https://motoinstruction.ru/img/honda/9/115821.jpg)
Before releasing the cam chain tensioner, measure the distance the cam chain tensioner projects above the bracket as shown.
![](https://motoinstruction.ru/img/honda/9/115822.jpg)
Replace the cam chain with a new one if the projection exceeds 9.0 mm (0.35 in).
To replace the cam chain, remove the following parts:
- Cam sprocket (page 8-21)
- Front cylinder: flywheel (section 18)
- Rear cylinder: primary drive gear (section 10)
Release the tensioner by pulling wedge A straight up while holding wedge В down then secure wedge A with a 2 mm pin as shown.
![](https://motoinstruction.ru/img/honda/9/115823.jpg)
If you plan to replace the camshaft and/or cam sprocket, remove the cam sprocket bolts as follow:
- Remove the cam sprocket bolt.
- Rotate the crankshaft clockwise one turn (360°) and remove the other cam sprocket bolt.
- Remove the cam sprocket from the camshaft flange surface.
![](https://motoinstruction.ru/img/honda/9/115824.jpg)
Be careful not to let the cam sprocket bolts fall into the crankcase.
Remove the camshaft holder bolts and camshaft holder assembly.
![](https://motoinstruction.ru/img/honda/9/115825.jpg)
Remove the dowel pins.
![](https://motoinstruction.ru/img/honda/9/115826.jpg)
Remove the camshaft.
![](https://motoinstruction.ru/img/honda/9/115827.jpg)
Attach a piece of wire to the cam chain to prevent it from falling into the crankcase and remove the cam sprocket from the cam chain.