Please Help 2018 Crf450r valve tick??

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3/20/2019 5:09 PM

I just bought a new 2018 Crf450r. I brought it home and did a 1 hour break in split into 3 heat cycles like I always do. Toward the end of break in it started making a noise what sounded to me like a valve tick only on deceleration. I brought it in and did my first oil and filter change and checked the valves. I got 0.010 on both exhaust valves. 0.006 and 0.005 on the intake valves. That's in spec according to the owners manual. I took it out again after oil change and valve check and got on the throttle pretty hard a couple times and it got worse. It is a little louder of a tick now and I can now hear the tick at idle, accelerating and decelerating. Can someone please help me I'm sorry this is so long but I needed to explain the whole situation. I posted on thumper talk and no help yet. I've never had a brand new bike give me problems before but this is my first honda.

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3/20/2019 5:53 PM

Dillon__Taylor1992 wrote:

I just bought a new 2018 Crf450r. I brought it home and did a 1 hour break in split into 3 heat cycles like I always do. Toward the end of break in it started making a noise what sounded to me like a valve tick only on deceleration. I brought it in and did my first oil and filter change and checked the valves. I got 0.010 on both exhaust valves. 0.006 and 0.005 on the intake valves. That's in spec according to the owners manual. I took it out again after oil change and valve check and got on the throttle pretty hard a couple times and it got worse. It is a little louder of a tick now and I can now hear the tick at idle, accelerating and decelerating. Can someone please help me I'm sorry this is so long but I needed to explain the whole situation. I posted on thumper talk and no help yet. I've never had a brand new bike give me problems before but this is my first honda.

pull in the clutch and see if the tick goes away. I had a similar thought about the valves....but when you pull in the clutch the noise goes away. (2018 CRF450RX...same engine as the R)

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Many thanks to everyone helping me out this GNCC season: SRT Offroad, Acerbis, FCR Suspension, O'Neal Racing, Evans Waterless Coolants, Rekluse, Twin Air, Braking Brakes, Carbsport

Profile image credit Ken Hill Photography

3/20/2019 6:17 PM

I will try that tomorrow it would be nice if that was it but it sure does sound like its coming from the head though. Sounds can be confusing on these things. Thank you for the comment.

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3/21/2019 7:38 AM

Could be header exhaust leak also. O-ring is a bit flimsy.

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3/21/2019 12:56 PM

Exhaust leak or you are just hearing the decomp mechanism.

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3/21/2019 2:07 PM

(Update) I tried pulling in the clutch and that didn't make a difference but it does not do it while it is cold only when hot. Here is a link to a video I made but I will admit it sounds worse in the video than it actually is.

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3/23/2019 8:12 AM
Edited Date/Time: 3/23/2019 8:14 AM

Dillon__Taylor1992 wrote:

(Update) I tried pulling in the clutch and that didn't make a difference but it does not do it while it is cold only when hot. Here is a link to a video I made but I will admit it sounds worse in the video than it actually is.

Was the engine at room temperature when you checked the valve clearances? I let mine sit overnight before I check the valve clearance. Also, I'd pull the cam cover again, check that the cam chain is tight, check the camshaft retainer cap bolts for proper torque (before you check the valve clearance), and check the decompression weight for play/make sure it's not rubbing anything. Also as suggested above, you could have an exhaust leak. Check the header retainer nuts for torque, and if it is leaking you'll need a new copper crush ring

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Many thanks to everyone helping me out this GNCC season: SRT Offroad, Acerbis, FCR Suspension, O'Neal Racing, Evans Waterless Coolants, Rekluse, Twin Air, Braking Brakes, Carbsport

Profile image credit Ken Hill Photography

3/23/2019 8:25 AM

Sounds fine to me

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3/23/2019 4:26 PM

It was at room temperature when I checked and the cam chain was tight but I didn't check the decompression weight. And it's not an exhaust leak I'm sure. Thanks for all the replies.

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4/26/2019 7:10 PM

Hi Dillon,

I have a 17 that sounds very similar. Did you find a resolution on this? Only does it when warmed up. Valves in spec, nothing odd in valve train. Sound is not there cold.

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4/28/2019 3:40 PM

Refer to your manual to see if the valves are to be adjusted hot or cold . And appropriately check them in the same situation would be my 1st go at it . These new hondas also have lots of engine noise . If valves were loose you would most likely be getting some backfiring or hard starting . Good luck !

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2018 crf 250r

4/30/2019 7:27 AM

Tryhard wrote:

Refer to your manual to see if the valves are to be adjusted hot or cold . And appropriately check them in the same situation would be my 1st go at it . These new hondas also have lots of engine noise . If valves were loose you would most likely be getting some backfiring or hard starting . Good luck !

Manual says cold and valves checked as such. Decomp weight looks/feels fine. Going to swap the exhaust gasket and see but I doubt that will do anything. No cracks in exhaust. Just hard to figure out what would start ticking once the bike gets to operating temp...Thanks!

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6/12/2019 5:58 AM

Hey mate, just wondering if you figured out what was making the tick? I’m experiencing the same issue with my 450 only has 10 hours on it?

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6/28/2019 11:29 AM

Blake28 wrote:

Hey mate, just wondering if you figured out what was making the tick? I’m experiencing the same issue with my 450 only has 10 hours on it?

I have not! I have verified valves are in spec several times, changed exhaust gasket, and replaced cam chain tensioner. It only ticks when its warmed up. Cold it doesn't do it. Clutch has no effect. Havent ridden it much other than to try it out after making a change. I keep thinking valves, but they are all within spec in the middle to on the tighter side.

Only thing i can think of is the clearance opens up a little when it gets hot enough to make a noise when the cam shaft hits the rocker arms. Otherwise I am clueless.

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6/28/2019 1:51 PM

Mine will make the same noise when the idle is set to low so the decomp will not disengage. I would double check the decomp to make sure it is working properly.

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6/28/2019 8:10 PM

Blake28 wrote:

Hey mate, just wondering if you figured out what was making the tick? I’m experiencing the same issue with my 450 only has 10 hours on it?

jayB22 wrote:

I have not! I have verified valves are in spec several times, changed exhaust gasket, and replaced cam chain tensioner. It only ticks when its warmed up. Cold it doesn't do it. Clutch has no effect. Havent ridden it much other than to try it out after making a change. I keep thinking valves, but they are all within spec in the middle to on the tighter side.

Only thing i can think of is the clearance opens up a little when it gets hot enough to make a noise when the cam shaft hits the rocker arms. Otherwise I am clueless.

Clearances get tighter as it warms up. Thermal expansion makes everything bigger.

Harbor freight sells mechanics stethoscopes for $3. Go get one and probe around your engine while its running. Youll quickly find the cause.

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7/1/2019 5:57 PM

kb228 wrote:

Clearances get tighter as it warms up. Thermal expansion makes everything bigger.

Harbor freight sells mechanics stethoscopes for $3. Go get one and probe around your engine while its running. Youll quickly find the cause.

Bought the stethoscope. Got it warm and started poking around. I still cant identify the source of the tick. It isnt obvious. Still just as confused as i was before... Cant hear it cold. Gets louder when the bike gets hotter. And it will vary with the RPM. Not just at idle. Decomp seemed to be functioning fine when I. had it out for the one valve adjustment i made.

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7/3/2019 2:36 PM

Ok...From my best estimate after listening again it seems the tick is coming from the throttle body. That's the only place in the entire motor I hear anything through the stethoscope that sounds like the tick I hear. Do some injectors make noise more than others?

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11/14/2020 1:49 PM

Mine does the same thing and always has (135 hours, I’ve had the bike for exactly 3 years now). Are these newer motors with the finger follower valve trains just super noisy? I remember people mentioning in that huge KX450 thread that the newer Kawi engine (which also has new finger follower valve train if I’m not mistaken) is super noisy too.

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Don't ever let facts get in the way of a great story

11/25/2020 5:27 AM

hubbardmx50 wrote:

Mine does the same thing and always has (135 hours, I’ve had the bike for exactly 3 years now). Are these newer motors with the finger follower valve trains just super noisy? I remember people mentioning in that huge KX450 thread that the newer Kawi engine (which also has new finger follower valve train if I’m not mistaken) is super noisy too.

So yours is only when its hot too? Sounds quiet cold, but ticks when warmed up. I even replaced the piston, rings, cam tensioner and cam chain. Nothing changed. Valves always in spec. I installed the electric start kit, and had the ECU remapped. Point is I have been all over this bike and nothing is out of the ordinary that I can find, other that the annoying tick. Bike has always ran fantastic. must just be the design of the motor as you mentioned.

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11/25/2020 8:48 AM

Check the roller on the exhaust rocker. 17-18's had issues with the bearing breaking on the roller. I doubt that is your issue since the bike is new but it is worth a shot

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