Smoker when warm - time to rebuild - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 8 (permalink) Old 04-19-2014, 01:23 AM Thread Starter
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Smoker when warm - time to rebuild

I recently bought a '03 with about 50k on it. I haven't ridden it very much yet but it pulls strong and sounds good. Fairly stock save for PC3 and full ti Akra.

However I noticed that it burning oil. Not to the extent that I would say it's noticeable in the oil window but you can see it (and smell it) when you blip the throttle or when it's idling. On to move you can't see it, neither when pulling hard or on the overrun, only when static. And only when full warm, not when cold.

When I turn the engine off, smoke's coming out of the exhaust, mostly (if not only) the right side.

According to the PO this behavior is new (off course). A shop set the valve clearances last fall and the bike was hardly ridden after that (only like 5 miles or so). So there's a chance they they may have screwed something up, like the PAIR o-rings. I'm gonna look it up but may rebuild regardless of the outcome.

Anyhow, I've talked to a shop about a rebuild/mild tune up. Not looking for hp really, rather making it run better (and not smelling like a diesel). I'm thinking about doing the following:
* Minimum bore/hone and forged pistons.
* Heads clean up porting and valve job.
* Bearings, replace what's worn etc.

Questions:
* What c/r to shoot for?
* I can get my hands on race cams (HRC or Moriwaki - he wasn't sure). Is it "worth it" to buy them and put them in? Ie how poor are the stockers?
* What did I miss? Are there any other must do's?


Thanks,

Magnus
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post #2 of 8 (permalink) Old 04-19-2014, 12:53 PM
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Yeah, new valve seals and piston job should do the trick. Cams would be nice as well, just be aware race cams will require a different valvetrain. Can't use the stock setup with it.

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post #3 of 8 (permalink) Old 04-19-2014, 01:17 PM
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Some of this of course depends if your cylinder walls aren't scored badly.
Keep us posted on you progress and good luck.



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post #4 of 8 (permalink) Old 04-19-2014, 01:53 PM
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The cylinders have aluminum-ceramic-graphite liners so it isn't potentially as simple as a hone.

And a race valvetrain is rated with a very low mileage life.

Last edited by kwtoxman; 04-19-2014 at 01:56 PM.
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post #5 of 8 (permalink) Old 04-20-2014, 12:43 AM Thread Starter
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Originally Posted by madbuyer View Post
Some of this of course depends if your cylinder walls aren't scored badly.
Keep us posted on you progress and good luck.
Yes, time will tell. I'm lucky, this is a very good shop. Will keep you posted, but this will most likely be a project for the winter.

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Originally Posted by kwtoxman View Post
The cylinders have aluminum-ceramic-graphite liners so it isn't potentially as simple as a hone.

And a race valvetrain is rated with a very low mileage life.
But they can be re-plated I assume?
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post #6 of 8 (permalink) Old 04-20-2014, 12:48 AM Thread Starter
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Originally Posted by gts455 View Post
Yeah, new valve seals and piston job should do the trick. Cams would be nice as well, just be aware race cams will require a different valvetrain. Can't use the stock setup with it.
What do you mean by different valve train? Springs and perhaps retainers I understand but what else?

I don't know how wild these cams are. I'm just looking for a nice little bump in performance, not something crazy to the point of sacrificing drivability or reliability (I got other bikes for that...)
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post #7 of 8 (permalink) Old 04-21-2014, 01:03 PM
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Thats all you should need, besides new seals (might as well do those while it is apart). You can get titanium retainers from kibblewhite. Mori/HRC springs are pretty hard to come by.

kent cams does a kit as well.

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post #8 of 8 (permalink) Old 04-21-2014, 01:46 PM
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Originally Posted by firefish View Post
But they can be re-plated I assume?
Yes, but I can't find anyone who does the Honda type of plating.

I'd probably just get new cases if the liners are worn out. Here is a little info on replating http://www.speedzilla.com/forums/hon...tml#post512083

Plating may not even be necessary. I don't know enough of the details on service measurement limits for the cylinders. And one would need to measure that and see options. There is this for example. http://www.fireblades.org/forums/how...nda-motor.html

You can research and decide. I didn't do much research.



HRC spec cams were typically rated for something like a 1500 km service life. For example, check out these HRC service intervals and life for the CBR1K valvetrain. http://hrc-honda.com/author/est/page/2/

Last edited by kwtoxman; 04-21-2014 at 01:49 PM.
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