2004-2021 Honda CRF 250 or 450 Valve Shim Adjustment | DIY Repair

A complete tutorial on how to correctly adjust shims for the following years:
2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
and for the following bikes: CRF250X CRF250R CRF450X CRF450R CRF250 CRF450 250X 250R 450R 450X
Products used: (Commissions earned)Hot Cams 7.48mm Complete Shim Kit HCSHIM01 for Honda CRF
amzn.to/3hit3wy
Stainless Steel Feeler Gauge Dual Marked Metric and Imperial Gap Measuring Tool (0.04-0.88 mm, 32 Blades)
amzn.to/3du2nHR

[@rymize4584]

by far the best video ive seen on this process yet, thanks for giving me a clear understanding

[@jeremyhancock203]

Thank you for taking the time to do this vid. It’s perfect 👍

[@josephlongo6556]

By far the best video on KZbin by far on details about valves!!!!!!! Thanks man

[@79series]

Great video mate, perfectly detailed. Well done.

[@Fourandaquarter]

Nice video. Clear and concise. Easy to follow. Great!

[@ernesto_yz125x]

Thank you for the video brother never done it in my 04 crf 250r but after watching your video i will do it my self great information u gave us

[@shayneevans8804]

Great video. So helpful, thank you.

[@hellrotgarage]

Awesome video man

[@1son8043]

You have explained this in a very easy way too do, a lot of people are put off with video that starts going on about measurements to work out the right shim size this method works perfectly well and makes it easier for people to do themselves, well done 👍.

[@SquareBodyK5]

Exactly

[@justuswallace3134]

Awesome vid. Thanks much

[@sbcs1038]

Thanks for the video

[@bikersoncall]

7:02 You're making so much easier than everyone else for calculating the needed shim. Shame the don't make available SAE shim sizes. I think I'll mark the equivalent sizes in shim assortment case. I would guess that the bulk of the CRF R And X models sold are sold right here in the US.

[@RIPMmusic]

Thanks for you crf valve vids, my bike is difficult to start. Off to garage and see if this is the problem..

[@richardmolina5378]

whats that the problem?

[@bikersoncall]

I think I have this right now, if the clearance of a particular valve after 20 hr riding is .004'' , and we need .005'' to be in spec, we would use a .003'' shim to bring it to spec. Using mm's for this job may be incredible for the Japanese, but for me it is much more work when it could be so simple using SAE.

[@bikersoncall]

5:40 Seems like great info so far, but it's pretty scary to see all those shims sitting in an easy tip over tray right over the top of the engine.. lol

[@afkgang5076]

In other word to tight means smaller shim to loose means bigger shim

[@skarebsuper]

hi, why does the 7.48mm OD shim actually measures up to be 3.74mm in diameter? (1/2 the size specified)

[@lorenzoromerosanchezlorenz2324]

acuanto van las calibracio in/ex 250x

[@afkgang5076]

So I can basically put a shim in until it’s matches with my spec like put a shim in test it if to tight need smaller shim to loose bigger shim but it’s have to be in spec

[@jurgenbuntinx1]

Yes, for instance, if you do intake(0.16) and you cannot put in 0.14 you need to place a smaller shim and vice versa

[@theflyingclutchco.5918]

Tried adjusting the valves on my new to me ‘04 yesterday. The cam lobes were at the 180 degree position from where they are shown here with the piston at TDC and the right side timing mark lined up. Anybody know what the hell I’m supposed to do? It’s not measurable from that position, as the exhaust rocker is tight when I measure it there.

[@blindshot709]

If the valves need to be shimmed , with the bike have low compression

[@kootenaycat]

I'm adjusting the valves on an '04 CRF450 I bought recently and one intake valve has no clearance. When I calculated the shim size I need it's not available thru Honda, I need a 1.10mm and smallest they sell is 1.20mm. I'm guessing I need to pull the head. Is it possible the valve itself deforms or is it usually the seats that pound into the head?

[@ptso34]

You are in for a valve job mate, everything under 1,30 is setting you in danger of catastrophic failure.

[@henryfreund_]

The more proper way to do this is to measure your gap, then pull the shim and measure the shim with a micrometer. Do the math to see how much less/more shim you need to be back in spec. Only have to take everything off once.

[@richardmolina5378]

and what are the specs? cant find them anywhere?

[@vtecmossy]

How the hell does a 450 run with the Cam 180 degrees out 😳🤨 Well it does run but, yeah I don't understand how when everything is opening and closing at the wrong time Has damage been done 🤔 Guessing some cabbage put the cam in backwards on last shim job Or can the cam spin 180 degrees out of spec 🤔 doubtful Buy used its always a fun learning experience 😳😁🤣

[@billsettle9301]

Possibly the piston is at TDC on exhaust stroke rather than at TDC compression, which is where it needs to be for valve clearance measurements. I would record all clearances 1st, remove the camshaft once. Not a fan of having the cam caps removed while measuring clearances