Valve clearance measurements by members - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 30 (permalink) Old 12-19-2012, 02:34 PM Thread Starter
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Post Valve clearance measurements by members

I thought I'd start a thread where people can post their valve clearance measurements when they get around to checking the valves as per the recommended maintenance schedule (valve adjustment).

It will be interesting to see what kind of changes are happening and at what mileage it is happening. Add any tips or tricks to your post that you have.

Post year of bike and mileage with your measurements. We can use this like a mini database.


Recommended valve clearance measurement schedule is 16,000 miles or 25,600 km.

As per the maintenance manual, recommended valve clearance -
Intake:
.16mm +/- .03mm (.006" +/- .001")

Exhaust:
.31mm +/- .03mm (.012" +/- .001")




My info

2004 RC51
Mileage ~ 12,000 miles (the bike was apart already soI decided to check them)

Rear Intake(as if sitting on the bike)
Left 0.152 mm or 0.006"
Right 0.140 mm 0.0055"

Rear Exhaust
Left 0.292 mm or 0.0115"
Right 0.292 mm or 0.0115" (but tighter than the left side)


Front Intake
Left 0.152 mm or 0.006"
Right 0.132 mm or 0.0052"(about)

Front Exhaust
Left 0.305 mm or 0.012"
Right 0.292 mm or 0.0115"


Interestingly the right side valves are generally tighter than the left side.
All are in spec but my front intake right valve is getting close to out of spec.

Tips:
Read the manual carefully and follow it. The rubber cover gaskets should have gasket adhesive applied (on the cover side). Also the dowel pins have o-rings on them. When I took off my valve covers the o-rings were stuck on the inside of the covers. I placed them back on the dowel pin when beginning reassembly.

Last edited by kwtoxman; 12-19-2012 at 04:04 PM.
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post #2 of 30 (permalink) Old 12-19-2012, 03:48 PM
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If you are doing this, you might as well replace the valve cover gaskets too while you are at it. Unless they are nice and soft still.




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post #3 of 30 (permalink) Old 12-19-2012, 04:13 PM Thread Starter
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Originally Posted by b.miller123 View Post
If you are doing this, you might as well replace the valve cover gaskets too while you are at it. Unless they are nice and soft still.
I didn't because mine are still in good shape. Good tip though.
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post #4 of 30 (permalink) Old 12-19-2012, 05:53 PM
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2002 RC51 at 36K miles (current engine, before engine swap).

Tolerances:
Intake: .16mm +/- .03mm (.006" +/- .001")
Tolerance range: .013 - .019mm (.005 - .007")

Exhaust: .31mm +/- .03mm (.012" +/- .001")
Tolerance range: .28 - 0.34mm (.011 - .013")
--------------------------------------------------

Front cylinder (#2):
Left Intake: .007"
Right Intake: .0065"

Left Exhaust: 0.11"
Right Exhaust: .013

Rear Cylinder (#1):
Left Intake: .0085" (corrected, now .0065")
Right Intake: .007"

Left Exhaust: .013"
Right Exhaust: .010" (corrected, now .012")

Last edited by SubSailor; 12-19-2012 at 05:56 PM.
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post #5 of 30 (permalink) Old 12-19-2012, 06:27 PM
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As far as I can see, neither there's any tolerance mentioned in the RC's service manual's specifications...



...nor during procedure explaining



like there is in other manuals.

For example this one is from the CBR 1000RR 2004



I believe that goes with the bike's ultimate structure and operation.


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post #6 of 30 (permalink) Old 12-19-2012, 06:41 PM Thread Starter
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The 2000 - 2006 NA service manual provides the tolerances posted by myself (and bmiller123 in an older post). On both pages. You're link source must be older.
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post #7 of 30 (permalink) Old 12-19-2012, 08:16 PM
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Quote:
Originally Posted by MakisRC51 View Post
As far as I can see, neither there's any tolerance mentioned in the RC's service manual's specifications...
Makis my friend, the tolerances are not shown in downloadable PDF the UK/Euro Service Manual.
However, the downloadable PDF of the N. American Service Manual does show the tolerances.

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post #8 of 30 (permalink) Old 12-19-2012, 10:28 PM
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Oh ok.
I guess it is Honda's policy for some reason
However, I never believed that there would be any problems if one was adjusting them under a tolerance policy. After all it still IS a Honda engine from the golden era!


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post #9 of 30 (permalink) Old 01-04-2013, 06:30 PM Thread Starter
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I am interested to see what the information shows as more people post. It appears at this early stage that the valve clearance tolerances initially decrease at the valves seat into the head, and then with time, valvetrain wear increases the tolerances. That would in part explain why so little valve adjustment is needed over much of the early/middle-age mileage.
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post #10 of 30 (permalink) Old 01-04-2013, 06:33 PM
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Garage
I will post my numbers soon, Another month or so.....They were checked out ( and were in spec ) when i bought mine...but it is due again.

-2001 Honda RC51 sp1 " Slightly Modified "
-2001 Honda 929RR Erion Edition
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