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 Re...
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: www.partzilla.com/catalog/hon...
See the camshaft and valve diagram here: www.partzilla.com/catalog/hon...
See the cylinder head cover diagram here: www.partzilla.com/catalog/hon...
Find more 2005 Honda CRF450 diagrams here: www.partzilla.com/catalog/hon...
Get supplies here:
Feeler gauge: www.partzilla.com/catalog-pro...
Maxima Assembly Lube: www.partzilla.com/product/aft...
Shim kit: www.partzilla.com/catalog-pro...
Read how to do this job step by step: www.partzilla.com/blog/honda/...
Watch us remove the engine on our Honda CFR450 here: • Honda CRF450 Engine Re...
See the CRF450 engine teardown here: • Honda CRF450 Engine Te...
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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[@grantottaviano7445]

Those aftermarket valve springs are for the Kibblewhite SS valves. Someone swapped to stainless steel intake valves to improve longevity on that used cylinder head you have there. The springs have a different rate for a heavier valve.

[@BrendanMX]

That is a kibblewhite stainless intake conversion kit. They need heavier springs. So they give the dual spring kit

[@benlundgren3760]

Really enjoy your videos and the attention to detail. Thank you!

[@tv-is6dp]

Thank you so much...

[@Roland61164]

I have a question: If the titanium valves are no longer tight and I'm not allowed to grind them in, do I need new ones? How do you machine the valve seats for the titanium valves? Or needed a new head?

[@nighthawkj30A4]

Love Honda Genuine Parts and Accessories

[@juliocesar8111]

Que medida dejo el descompresionador ?

[@andrewvincent1579]

Skipped decompression adjustment ?

[@emiliomaireles3928]

por favor un video en español de inyeccion electronica o la forma de traducirlo

[@emiliomaireles3928]

como podria traducirlo a español gracias

[@CDNgrizzly925]

I know this question is irrelevant to the video however i have just purchased a 2014 Honda Crf 450r and instead of the stock air forks that it should have the previous owner installed an MCR A inner kit. My question is does this kit require the same maintenance as the showa spring fork? The reason why I’m asking is because I’d like to know just what I’m dealing with when i need to replace seals on them.

[@JM-yx1lm]

Seems like that a better question for the manufacturer

[@alubaidillahghazali2359]

Same or not tdc crf2013??

[@leesauter9515]

There are 2 hash marks on the flywheel. Which mark do you align with the case? 1st or 2nd hash mark? I believe 1is f for fire? And 2 is t tdc?

[@mrmustache8735]

2nd one

[@conorscolubrids5755]

What if there’s only one hash mark? I must have an aftermarket flywheel

[@T-Eazy90]

When at TDC which way should cam lobes face?

[@azrida9543]

Intake

[@T-Eazy90]

@@azrida9543 front or back? Ive never done this before

[@ramohernandez8187]

Is it possible to install a 08 head on a 03 crf 450

[@conorscolubrids5755]

The auto-decompressor is different on the 07-08

[@andresmontejo9113]

P

[@andresmontejo9113]

P