Honda CRF450 Piston Installation | 2005 Honda CRF450-R Engine Rebuild Part 5 | Partzilla.com

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Check out the Wiseco Garage Buddy kit for the Honda CRF450R here: partzil.la/Hond...
In part 5 of our Honda CRF450R engine rebuild series, we’re going to show you how to install the piston and cylinder on our CRF450R. If you want to go back and see the CRF450 engine rebuild from the beginning, start here: • Honda CRF450 Engine Re...
Details are everything in engine building, so the key here is to take your time. Since we’re installing a new Wiseco forged piston, we’re going to pay special attention first to our ring gaps AND the position of those gaps around the piston itself. John will show you how to measure the ring gaps and then how to grind the piston rings to meet the exacting specifications for this build.
With the ring gaps measured, we have a choice: we can install the rings on the piston BEFORE we attach the piston to the connecting rod, or we can do it after. In our case, we’ll make some marks to show us how the rings will install, and then we’ll get the piston in place. Once that’s done, we’ll get the piston rings on.
Once the piston is in place, we can slide the cylinder over the top. Take your time here and don’t force it: you’ll need to add a little pressure to the rings to get them past the opening at the bottom of the cylinder. Once that’s done, it’s just one bolt to hold everything in place to complete this part of the build.
Next up? The top end. Chec out the cylinder head installation and valve adjustment on the CRF450R here: • Honda CRF450 Head Inst...
See the crankshaft and piston diagram here: www.partzilla....
See the cylinder diagram here: www.partzilla....
Find more 2005 Honda CRF450 diagrams here: www.partzilla....
A few special tools and supplies in your shop will help out on this phase of the job. Check them out here: • Honda CRF450 Head Inst...
Feeler gauge: www.partzilla....
Ring grinder: www.partzilla....
Ring installer: www.partzilla....
Maxima Assembly Lube: www.partzilla....
Read how to do this job step by step: www.partzilla....
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:
Measuring the ring gaps - 2:00
Using a ring gap grinder - 3:00
Installing rings - 4:45
Installing piston - 5:55
Installing cylinder - 11:30
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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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[@tomatoknuckles]

These videos are so detailed that i wouldn't be afraid to do this by following along. Very helpful thanks.

[@PartzillaParts]

Eventually, you just have to get in there and do it!

[@justfunk88]

Would be nice, to see video about measuring cylinder and piston gap. Right geometry of cylinder. And about honing too

[@michaelbiel7473]

Me and my son built a 2015 yz450f it turned out beautiful and were big fans of yours

[@Rolandnarc]

My son and I moran

[@KBarron43]

@@Rolandnarc moron*

[@SquareBodyK5]

🤔​@@Rolandnarc

[@eperformace3055]

Helps me a lot love learning dude✊🏾

[@PartzillaParts]

Glad to help

[@Digitaltiger123]

You never measured the piston to cylinder clearance without rings

[@jefcoppens9725]

is there any information about the piston height corresponding with top of cylinder? In no WSM is indicated how to check this and which values of piston play towards cylinder head must be respected. Especially when using aftermarket piston and gasket kit. In aftermarket gasket kits are differences in thickness of cylinder bottom gasket and cylinder top gasket. Therefore this request.

[@richardmwaanga3438]

I need your help