Head Gasket - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 32 (permalink) Old 08-28-2013, 07:30 PM Thread Starter
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Head Gasket

Does it require to drop the Engine? Service manual does not specify.
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post #2 of 32 (permalink) Old 08-28-2013, 07:53 PM
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You might be able to replace the head gasket on the rear cylinder, but the front cylinder will be very difficult as the head is nestled under the steering head. It will be tight!
I've never done it with the engine in the frame myself.

And for SP2's (since it's what I have), you don't have to remove the front ignition coil to remove the engine.
There's enough space for the head to clear the coil and wiring harness on the left side.
Better if you use two people since that engine weights 160 lbs.
Pulling the engine is far easier than installing it.

For installation, I found that tilting the engine forward on the lift, I can slide the tail of the engine back and up so I can then slide the lower rear mounting bolt and spacer into place.
Then it's just a matter using the lift to swing the engine up into position for the rest of the mounting bolts and spacers.
Then attach the swingarm and begin torquing the bolts and nuts in the specified sequence.

SP1 have the adjust bolts and locknuts for the engine, so it's a bit more involved, but not excessively different.

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post #3 of 32 (permalink) Old 08-29-2013, 08:36 AM Thread Starter
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So the SP2's do not require a special tool to loosen the swing arm nut? I haven't gone through the service manual in detail yet. Just trying to get some insight on what I'm getting myself into.
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post #4 of 32 (permalink) Old 08-29-2013, 08:39 AM
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You need a special tool. I'd call it a castle nut socket. You can see examples on eBay if you search RC51 swingarm tool, or RC51 tool.
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post #5 of 32 (permalink) Old 08-29-2013, 12:42 PM
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Originally Posted by auto35069 View Post
So the SP2's do not require a special tool to loosen the swing arm nut? I haven't gone through the service manual in detail yet. Just trying to get some insight on what I'm getting myself into.
No, both SP1 and SP2 both require a special tool to loosen and torque the lock nuts (castle locking rings) for each adjust bolt on the swingarm.
The SP1 also requires a 21mm allen socket to loosen and torque the right swingarm adjust bolt, and a 14mm allen socket to loosen and torque the left swingarm adjust bolt via the hex under the swingarm pivot bolt.

The SP2 uses specific distance collars with the engine mounting bolts to secure it into the frame.
The SP1 uses adjust bolts and locking nuts (requiring a special tool to loosen and torque) the engine to the frame.
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post #6 of 32 (permalink) Old 08-29-2013, 01:06 PM
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Garage


One of these ?

I got mine from Ben.
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-2001 Honda RC51 sp1 " Slightly Modified "
-2001 Honda 929RR Erion Edition
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post #7 of 32 (permalink) Old 08-29-2013, 03:51 PM
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One of these ?

I got mine from Ben.
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Yes, same as the one I have.
But I don't use it as I had the special tool long before I bought the one from Ben.
One end for the swingarm lock nuts, and the other for the SP1 engine mount lock nuts.
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post #8 of 32 (permalink) Old 08-29-2013, 06:00 PM Thread Starter
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Well... I shall attempt to replace the head gaskets with the engine in the frame. According to the Service Manual, looks like the head has bolts instead of studs. Not to sure if the dowel pins will be a problem when lifting that head out. I'll keep you all informed if I'm successful or not.
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post #9 of 32 (permalink) Old 09-15-2013, 05:46 PM Thread Starter
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Well.... finally got some time off and wrenched on my "Arcee" today. I was able to remove BOTH front and rear cylinder heads without dropping the engine. Even had a little bit of breathing room on the front cylinder. Popped the head off and examined it, there was water in the cylinder itself and saw where the water was coming through on the head. However I don't see a spot on the gasket where it might have punched through? Wouldn't it be obvious? Didn't see any cracks on it either. Thoughts?
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post #10 of 32 (permalink) Old 09-15-2013, 08:40 PM
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Did your engine overheat beyond the 251 deg F critical temp for a length of time?
If so, it could possibly be a warped head.
You could have it placed on a flat measurement plate to check if it exceeded the tolerances.
If the head is warped, you'll have to find a replacement.
You can't mill off the head surface due to the cam gears.
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