Honda CRF450 Head Installation | CRF450 Valve Adjustment | Honda CRF450-R Engine Rebuild Part 6

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In part 6 of our Honda CRF450R engine rebuild series, we’re installing the cylinder head and adjusting the valves. If you want to go back and see the CRF450 engine rebuild from the beginning, start here:    • Honda CRF450 Engine Rebuild  

With the piston and cylinder assembled on our CRF450R engine, our attention turns to the cylinder head. We’re working with lots of small pieces here, and the first rule is not to let them fall down into the engine. John will show you how to use magnets and some grease to prevent that from happening along the way.

We’ll start by removing components from the old head that we’re planning to reuse, and then we’ll get to work on our new head. We’ll show you how to use Prussian blue to check the seals on your valves, and then we’ll start getting those valves installed. After we get the springs in place, we’ll install the cylinder head on our CRF450. This will get us to the point where we can add the cam and measure the valve clearances. These components are new, and they should fit nicely, but we’ll still check.

After that, we’ll get the timing chain and sprocket attached and then close the engine up by bolting the head cover into place.

See the cylinder head diagram here: https://www.partzilla.com/catalog/hon...

See the camshaft and valve diagram here: https://www.partzilla.com/catalog/hon...

See the cylinder head cover diagram here: https://www.partzilla.com/catalog/hon...

Find more 2005 Honda CRF450 diagrams here: https://www.partzilla.com/catalog/hon...

Get supplies here:
Feeler gauge: https://www.partzilla.com/catalog-pro...

Maxima Assembly Lube: https://www.partzilla.com/product/aft...

Shim kit: https://www.partzilla.com/catalog-pro...

Read how to do this job step by step: https://www.partzilla.com/blog/honda/...

Watch us remove the engine on our Honda CFR450 here:    • Honda CRF450 Engine Removal | 2005 Honda C...  

See the CRF450 engine teardown here:    • Honda CRF450 Engine Teardown | 2005 Honda ...  

VIDEO HIGHLIGHTS:
Intro - 0:00
Removing old valves and springs - 2:15
Checking valve seals - 3:50
Installing valves - 6:00
Installing springs - 6:50
Installing the cylinder head - 10:00
Installing the cam - 13:30
Measuring valve clearance - 16:30
Setting timing - 18:20
Installing the cam chain tensioner - 20:00
Installing the head cover - 21:30

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In the video we’re working with a 2005 Honda CRF450R, but you may have similar steps for your Honda dirt bike. If you’re not sure whether these steps apply to your machine, leave a comment and we’ll get back to you.

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