Help w/ Cylinder Head Removal - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 19 (permalink) Old 12-04-2014, 08:41 PM Thread Starter
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Help w/ Cylinder Head Removal

Trying to remove front cylinder head.

I removed the cams, and then service manual says:

Remove the two 6mm cyl. head bolts, done.
Loosen the four 11mm cyl. head bolts, Um... There are no 11mm bolts but four 14mm bolts. (see pic)

So I'm thinking it's just a typo in the Service Manual, but I check on MR Cycles, and sure enough, it says four (11x105) bolts. same w/ rear cyl. head. Well, WTF I'm I missing something here? I also tried to loosen one of the 14mm bolts, and NO WAY, not even with breaker bar tool. Don't want to try anymore until I find out what gives.
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post #2 of 19 (permalink) Old 12-04-2014, 09:07 PM
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The main head bolts are special diameter 11mm, the bolt heads are 14mm.
Don't forget the 2 6mm screws on the side of the head also.
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post #3 of 19 (permalink) Old 12-04-2014, 09:12 PM Thread Starter
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Thanks, I thought I lost my mind 6mm bolts came out easy, cannot get the 11mm to budge at all, even with breaker bar. Is it ok to use a impact wrench or do you run a chance of damage to threads on cyl. head
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post #4 of 19 (permalink) Old 12-04-2014, 09:37 PM
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Hell yeah, use an impact if you have one.
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post #5 of 19 (permalink) Old 12-04-2014, 10:03 PM Thread Starter
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Time to wake up the neighbors!
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post #6 of 19 (permalink) Old 12-04-2014, 10:41 PM
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Yea I'd imagine head bolts or torqued on pretty good
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post #7 of 19 (permalink) Old 12-05-2014, 07:10 AM
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Remember, you use different torque values between new head bolts and reusing old head bolts.
When reusing your head bolts, the torque value is slightly higher (refer to service manual).
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post #8 of 19 (permalink) Old 12-05-2014, 09:25 AM Thread Starter
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Saw that, thanks:

47lbf-ft for new bolts
51lbf-ft for used bolts

I also noticed this:

"apply oil to threads and seating surfaces of head bolts and install"
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post #9 of 19 (permalink) Old 12-05-2014, 01:15 PM Thread Starter
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Shit

So I got the rear head off, no problem, then I take off the front head and...




WTF... water. I just took this bike to the track last month and it ran GREAT!

HELP
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post #10 of 19 (permalink) Old 12-05-2014, 01:27 PM Thread Starter
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When I hand turned (rotated) the crankshaft to align the index lines on the cams, could this have pumped some excess water in their?
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