Exhaust 2 part question - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 13 (permalink) Old 06-05-2014, 07:34 PM Thread Starter
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Exhaust 2 part question

I have an 01 RC51 with a bad exhaust leak. My question is could this exhaust leak cause the engine to stall?
My second question, is the 02 RC51 header to exhaust the same size as the 01? I want to get a full system exhaust but no one really carries a full system for an 01 RC51. Any help will be appreciated. I'm looking to get an Akrapovic system
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post #2 of 13 (permalink) Old 06-05-2014, 08:09 PM
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i dont *think* a leak would cause it to stall, not entirely sure though. i suppose it could throw off your mapping (lean it out) and make it run so poorly it would stall. and i believe a common mod for the sp1 guys is to install a sp2 header to run the more available sp2 systems
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post #3 of 13 (permalink) Old 06-05-2014, 08:14 PM
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An exhaust gasket leak should not cause your bike to stall.
Does your exhaust smell very rich in fuel? If so, you may have a bad fuel pressure regulator, which is not an uncommon item amongst Hondas.

The '01 exhausts are different than the '02 due to the different swingarm designs.
Plus the SP2 used D-shaped exhaust ports while the SP1 used round ports, although both used round exhaust gaskets for the head pipes.

The SP1's were only made two years ('00-'01), so most of the accessories were for the SP2 ('02-'06).

And most companies ceased making exhausts for these bikes years ago.
There were some exceptions, like LadyBird Performance, but even their full systems were only for the SP2.
About the best bet is to install a slip-on system from LadyBird Performance.
These are about on par with Sato, which was the best slip-on system, but also out of production.

Search for user SimonKobeJapan (at LadyBird Performance) and send him a PM. He is a super nice and helpful guy. And LBP is a real high quality product.

Their HRC replica full system has welds that are works of art.
Almost a shame to mount that exhaust and expose to Nature.

Last edited by SubSailor; 06-05-2014 at 08:16 PM.
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post #4 of 13 (permalink) Old 06-05-2014, 11:38 PM Thread Starter
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I did see Lady Bird exhausts during this search but prior to, I never heard of it. Didn't see any reviews as well. I did look for Sato pipes as well without any luck. The only thing that comes up continuously is the 2 Brothers pipes. Any thoughts?
As for the exhaust leak, I am changing out the gaskets and such but I will look into the pressure regulator as well. Thanks
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post #5 of 13 (permalink) Old 06-05-2014, 11:40 PM
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FUCK two brothers. pieces of poop, and ugly as hell...for real.
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post #6 of 13 (permalink) Old 06-05-2014, 11:54 PM Thread Starter
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I did recently rebuild my throttle body because I thought one of the fuel injectors went bad. Since I've had this problem I've replaced the spark plugs, rebuilt the throttle body, replaced fuel filter and pump, and cleaned the K&N air filter. I don't think the problem is in the exhaust system, Jardine slip ons, but the gaskets need to be replaced any way. I'm kinda at my wits end. I also removed my PCIII just in case.

I guess I won't be getting a two brothers exhaust....
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post #7 of 13 (permalink) Old 06-06-2014, 12:00 AM
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listen to subsailor bro, replace your FPR.

and i would just keep the jardines
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post #8 of 13 (permalink) Old 06-06-2014, 12:10 AM
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Why wont a LBP full system work on a SP1? Is the swingarm a little to wide?

Don't judge two brothers to harsh. No they're not the best, but for starter cheap they're ok.
It depends entirely on your budget, because we're talking $500 or so for the cheapy, like Dan Moto's, up to 1500~2000+ for a full Ti system from Akra or LBP.

Any slip ons or full system should be paired up with a Power Commander or Bazzaz and a dyno tune or at least a fuel map.

John, 2000 RC51 #000100

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post #9 of 13 (permalink) Old 06-06-2014, 12:28 AM Thread Starter
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I'll replace the fuel pressure regulator as soon as I can and update.
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post #10 of 13 (permalink) Old 06-12-2014, 03:02 PM Thread Starter
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Update. Still no good!!! I replaced the fuel pressure regulator and the exhaust gaskets and seals and it still runs bad. The FI light and manual is directing to the map sensor. I'll get to that tonight. Any other suggestions? I'm at my wits end and actually considering selling the bike. Any thoughts on the ECM if the map sensor doesn't solve the problem?
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