HRC kit and valve adjustment

[onebad450r]

Hey guys, I was out in the garage putting the HRC kit on my new 450R. The problem is, since installing the new cam my valve clearance is .008" L Exhaust, .007" R Exhaust, and .004" on Intake. It should be .011 on the exhaust and .006" on the intake....Did anyone else run into this problem? Are the crf 450 valve shims the same as the trx 450r? Where can I get them?

[onebad450r]

By the way its got a 230 stamped on the shims on the exhaust side and a 168 on the L Intake and a 170 on the R Intake.....I need some help.....need to know what size shims to put back in and if the crf 450 shims are the same

[adambomb]

Don't know if the CRF shims are the same but the 450R shims are not cheap! About $7 per shim. So, make sure you get the right ones. When I Put the HRC kit in mine all of the shims were the same....170.

[joe1l]

Go on service honda's website, and click on the 450r's parts diagram, and you can find 2 pages of shims, i'm sure the one you are looking for is there.
Joe
450r Diagram (http://www.servicehonda.com/hard%20parts/atv/trx450r%20%2704/2004trx450r.pdf)

[onebad450r]

I don't know which shims I need? All the shims on service honda are in .025" increments. (Correct me if I am wrong) I need to gain about .003- .004" on the exhaust and .002" on the Intake.....By dropping down one size from the original is going to be way to much clearance.....Am I getting excited over nothing? My wife says that I am a perfectionist.

[2004TRX450R]

OK for starters the numbers on the shims are metric. The 170 + 1.70mm. So what you need to do is convert your inch measurements to metric. Most feeler gauges have both standard and metric readings on them. Also I think you mean .008", .007" and .004" on your measurements. Make sure you have that right or you will get the wrong readings to get the right shims. Anyway what you do is take the take the number on the shim (say the shim is a 170 so you use 1.7mm) and add the amount of clearance from the feeler gauge that fits in it. You take that number and subract the amount of clearance that it is supposed to have and put the closest number shim in to that number. So if your shim is a 170 shim and your clearance is .004" (.004" + .102mm)and the clearance is supposed to be .006" (.006" + .152mm) take 1.70mm+.102mm-.152mm. 1.70mm+.102mm=1.802mm-.152mm=1.677. So you want to use the shim closest to a 165 wich would be either a 1.65 or a 1.70. I'm not sure but sometimes they go in between with a 167 ir a 1675 but I think on these shims they go in steps of 5. Yes they are the same shims as the CRF450.

[benwa450r]

You are correct on .011 ex. and .06 in. 3 out of 4 shims on mine were too thick. Example: exhaust .007 instead of .011. Needed to remove .004 to make correct so I used a micrometer and read thickness and then used fine sandpaper on top of a sheet of glass and sanded down shim until I removed .004 reinstalled and gap was correct at .011 Did this for all 3 that were too thick. If you have one that is too thin, need to buy new shims. I'd rather sand .004 off of shim instead of buy 3 new shims for $7 a piece.

[2004TRX450R]

First off I would NEVER sand down my shims. They are precision cut shims that are cut to exacting tolerences and are perfectly flat and paralell on both sides. If you get them uneven it will make the rockers wear funny and will load the buckets funny too. Usually at the shop I work at they just swap them out if we do a valve adjustment. Also next time you go to adjust them and if you do need to change them the numbers on them aren't accurate so it will be harder to figure out what size shims you need to get and if someone else does it or you forget that you sanded them down and go off the size on the shim to figure the new size they will come up wrong. Besides it is nice to have a few extras of stuff like that incase you have to do some work on your bike say at the track or at you favorite rideing area so that you have them to install and don't have to run to a bike shop and get some or what ever. This is just my opinion as I have run into stuff like this at the shop I work at and it just makes my job that much more of a P.I.T.A..

[onebad450r]

2004TRX450R

Thanks for the equation and mentioning the shims are metric...and for pointing out my mistake, should have been .00?". I'll edit the post....I just have one question, when doing your practice equation, I keep coming up with 1.65mm. Am I doing something wrong?

[BSTURDIVANT]

Should be: LI-160, RI-165, LE-225, RE220 will be close!!
We run all to the tight side of the specs for more power and less wear!

[2004TRX450R]

Originally posted by onebad450r
2004TRX450R

Thanks for the equation and mentioning the shims are metric...and for pointing out my mistake, should have been .00?". I'll edit the post....I just have one question, when doing your practice equation, I keep coming up with 1.65mm. Am I doing something wrong?

No just my bad. I guess the calculator I was useing forgot how to do math or something. Or the idiot behind the buttons was hitting the wrong ones.:D

[Hammer trx450r]

we all run to the tight side of specs? on valve clearance? so when they heat up they wont seat? i don't get it