SP1-SP2 header-done - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 19 (permalink) Old 04-28-2011, 03:49 AM Thread Starter
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SP1-SP2 header-done

Well, after all the discussion i've read and been in, I finished my header. The main purpose was to open up my options for aftermarket exhaust. It worked fine and was pretty easy.
I just cut off my 2-1-2 pipe from the front cylinder pipe. the back cylinder pipe has 2 slip joint/clamps. I just loosened them up all the way for flexibility. I couldn't find a cheap oem sp2 header, but Ben at rc51parts.com had a 'project' sp2 header for cheap, so I got it. All I needed was the sp2 x-pipe and it was in perfect shape. I admit to spending entirely to much time fitting things together before welding, but I don't do this all the time so I checked and rechecked. And re-checked. It all fit pretty good. Weld, smooth, put it all together, fire the bike up, and BAM, she snaps to life. Sounding sweet with the yosh's.

Time for a beer
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John, 2000 RC51 #000100

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post #2 of 19 (permalink) Old 04-29-2011, 02:04 AM
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nice job. the yoshimura's look great on there. Glad it worked out for you. So just to be clear for all the other guys who i'm going to refer to this thread.....An SP2 header will in fact fit on an SP1? Thanks for the thread Jondog.

2001 Honda RC51 SP1
1996 Honda CBR 900RR
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2010 BMW S1000RR (Sold)
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post #3 of 19 (permalink) Old 04-29-2011, 04:04 AM
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Nice job Johndog9 you must be pleased, the Yoshimura's look spot on.
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post #4 of 19 (permalink) Old 04-29-2011, 04:23 AM
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looks good man
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post #5 of 19 (permalink) Old 04-29-2011, 03:21 PM
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So tell me how this worked you took the sp2 header and cut off the front pipe of th sp2 and weldded your sp1 front pipe on to the sp2 x-pipe and that sp2 back pipe bolts to the sp1 back cylinder is this right.
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post #6 of 19 (permalink) Old 04-29-2011, 08:15 PM Thread Starter
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Thanks for the comments guys. That wasn't a very good post, it was late and I see the post isn't too clear. Sorry.
What I started with was my complete sp1 header, and most of a sp2 header. All that was missing from it was about 12 inches from the middle of the front cylinder pipe. The part next to the crankcase. Maybe it got crushed or something, I don't know. I found it on RC51parts.com and bought it in pieces.

All I used from the sp2 header, was the x-pipe. The front and back cylinder down pipes are my original sp1.

Picture 1 shows the sp2 x-pipe fitted up in place. And my sp1 front cyl. down pipe is hanging there in front. I grinded till i got a perfect match on the butt-joint. The sp1 x-pipe (2-1-2 in reality) is laying on the ground.

In Picture 2 the clamping points matched great where the x-pipe meets the sp1 back cyl. down pipe. Not a great picture, but it lines up just like it should.

Picture 3, my weld isn't all that pretty, so I concentrated on good fill. Ran the welder a little hot, and the wire speed kinda fast. made for lots fill while still getting good penetration. Then smoothed it down with grinder wheel and 180 grit. Then I took the picture.

Picture 4 shows it all mounted up and after I took it for a quick ride around the block to test.

The whole thing took about 4-5 hours. I musta been up and down on both sides of my bike a hundred times! Fitment was 95% satisfactory in the end. Not perfect, but real close. For once, one of my modifications was as easy as I thought it would be. I'm pretty happy with it, but now gotta install my pc and the right map.

John, 2000 RC51 #000100

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post #7 of 19 (permalink) Old 04-29-2011, 08:29 PM Thread Starter
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Quote:
Originally Posted by gts455 View Post
nice job. the yoshimura's look great on there. Glad it worked out for you. So just to be clear for all the other guys who i'm going to refer to this thread.....An SP2 header will in fact fit on an SP1? Thanks for the thread Jondog.
Well, my conversion wouldn't confirm that. But I've read a hundred times now from people who would know, yes they fit. I have never tried. But I found the project sp2 header, it was only $80. And I liked the idea keeping my sp1 down pipes cause they're mated to the cylinder port better than a sp2 header would be.

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post #8 of 19 (permalink) Old 04-29-2011, 08:37 PM Thread Starter
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Quote:
Originally Posted by Bayliss41 View Post
So tell me how this worked you took the sp2 header and cut off the front pipe of th sp2 and weldded your sp1 front pipe on to the sp2 x-pipe and that sp2 back pipe bolts to the sp1 back cylinder is this right.
Everything you said there is right except the very last. The sp2 x-pipe clamps the sp1 back pipe. The sp2 back pipe didn't fit as good. The sp1 back pipe is actually 2 pieces, so loosening them made fitment a little easier

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post #9 of 19 (permalink) Old 04-30-2011, 02:51 AM
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good write up. i think that is very clear now and will help people out. once again, the bike looks great.

2001 Honda RC51 SP1
1996 Honda CBR 900RR
2003 Aprilia RSV Mille R
1999 Aprilia RS50
2012 Triumph Daytona 675R (Sold)
2010 BMW S1000RR (Sold)
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post #10 of 19 (permalink) Old 04-30-2011, 10:46 AM Thread Starter
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Thanks gts455, I wanted to make a decent post about this, cause this merging of the two headers was just as straight forward and do-able as it looks.

I have lots more pictures and planned on doing a little write-up on this project. I'm thinking, when I get it done, I'll repost it one more time with a search friendly title to make it easy to locate. I dont know how many sp2 x-pipes are out there, probably not many that aren't already the whole header. You never know, Ben had one.
And thanks to Ben at rc51parts.com. He got me that x-pipe; good price, and a good, clean, no-dents part.

John, 2000 RC51 #000100

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