Jump to content
Sign in to follow this  

hrc cam/piston

Recommended Posts

is there a aftermarket place to get all the stuff in the hrc kit i know that ill have to get the gaskes from honda, but was wondering if i can get like a high compression piston from wisco instead of dealing with the stealership thanks for all the help

mike 53-t

Share this post


Link to post
Share on other sites

Wiseco, JE and Ross all make higher comp (11:1) pistons for the 650r. Ross doesn't offer a piston for our bike to the public, but they make them and sell them to XR's Only, Powroll, etc and you can buy through them. Cometic makes / sells high quality gaskets for our xr650r and many other bikes as well.

Pistons & kits for the XR650R...

http://www.wiseco.com/PDFcatalogs/CB05_honda.pdf (page 34)

http://www.jepistons.com/pdf/2002-motox11-12.pdf (page 1)

http://www.rosspistons.com/

Gasket kits for the XR650R...

http://www.cometic.com/catalogs/CycleCat04.pdf (page 6)

Share this post


Link to post
Share on other sites

wow thanks qadsan. what about cams, where is the best place to get a cam, cam chain, etc...

Share this post


Link to post
Share on other sites

It just depends on what you want. I like the HotCams because they're simple to install, inexpensive and I feel they're a quality product. Their cams are band new billet pieces (not re-grinds) which work with the stock valve train components if they're in good shape. You cannot however install your auto-decomp mechanism on the HotCam or most aftermarket cams for that matter and this may be an issue for some folks who want to retain it. http://www.hotcamsinc.com/

Webcam also offers a high quality product based on a reground cam, but they also hard weld their cams and they'll even make you a custom grind. To use their cams requires that you also have your rockers hard welded and this is something they'll also do for you. http://www.webcaminc.net/

Barnums offers custom ground cams from mild to wild for various engine combo's and desired performance and does all kinds of speciality work from crank balancing, engine blueprinting, porting, custom cams, custom exhausts, ignition, suspension, etc. http://www.barnumspro.com/

Honda offers an HRC cam that can be purchased seperately or in a kit with a higher compression piston, new cam gear, heavier duty cam chain, matched valve springs, etc. This cam allows the use of the auto decom mechanim, but it's more expensive than other aftermarket cam options.

Crower Power offers cams for CRF's and other bikes and they might also offer a cam for the xr650r, but you'd have to contact them to find out. http://www.crowerpower.com/

Depending on how crazy you want to get with a cam, you may need different valve springs, hard welded rockers, your piston may need to be modified so it doesn't hit the valves, etc. No matter which cam you get, you can't be too safe when installing it and make sure to properly break it in. If there are 'any' doubts on the clearances, then do a clay check and make sure you also take thermal expansion into account.

Share this post


Link to post
Share on other sites

WOW!!!!! thanks for all the info qadsan, this realllllllllly helps alot!

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

  • Similar Content

    • By TheLastByte
      Contemplating picking up a BRP in the near future and looking for some perspective.The current owner claims that the bike has about six hundred hours on it, but there's no way for me to confirm as the odo's not accurate.
       
      I know brp's have a reputation for running forever on stock top ends, but they must eventually have an expiration date. What should I look for on a high mileage bike like this to make sure I'm not setting myself up for disappointment? Also, What are some non engine/transmission related issues I should look for?
    • By TanSnowman51
      Guys, 
      Have been riding my 650L for over a year and a half and have been loving every second! In August I moved back to Reno after finishing up my masters at Arizona State. I have been spending most of my time riding around verdi to stampede and the Dog Valley road area. Always looking for riding buddies. 
      Was curious what everyone was doing as far as Daves mods or jet kit for the upper elevations 4,000 to 8,000 feet?
      FMF Q4 exhaust, smog delete done so far!
       
      Thanks!
    • By Alexandre Askmo
      Hey dear folk!
       
      I need your help.
       
      A bit of background info, I’m a complete noob when it comes to holding a wrench and doing anything more than filling up the bike. I have however had an interest for as long as I’ve had a bike to make it mine, and that’s why I’m writing to you now. I just bought a donor bike, a Honda NX650 which a friend of mine is helping me fix up and then modify to my liking (I’m hoping to end up with a gorgeous scrambler in about 9 months).
       
      We found a hairline scratch in the cylinder and need to bore it. This leads me to my question.
       
      Should I get a 1st overbore performance piston or keep the compression ratio as is? If so is there anything in particular I will need to modify to tolerate the high compression piston?
       
      If I do get the performance piston, should I also get a new carburetor, hot cam, and new exhausts? I am planning on new exhausts anyway (2-1 from an XRL) and I’m planning on removing the airbox and getting a K/N pod air filter.
       
      Again, keep in mind I know nothing, my friend has however fixed up a bunch of XRLs and cars but never really used performance parts. Help me out with the decision please, I would also like to keep the whole build to a reasonable cost (I know this is a very relative number).
       
      I should also add that I want to keep the DNA of the bike, for example keeping the fuel tank instead of switching to a smaller rounder one as one usually sees in most custom builds. The aim of the whole build is to have an insanely fun bike to ride, both in the city and off-road, as well as giving it a bunch of my personality 😊
       
      Thanks a lot for any help!
       
      Best,
       
      Alex
    • By MrCitizen
      I've been rebuilding/restoring an XR650R for some years now (after toasting the motor in 2013). Sent the motor off to be rebuilt, had a local shop rebuild my forks and shock, and took care of most everything else myself.
      As of a couple months ago I had almost everything assembled and ready to run.

       
      As a final check before adding fluids to the bike, I decided to stick my boroscope into cylinder and take a look. The results were concerning.

       
      These boroscope pics looked so gnarly that I pulled the head off the motor to get a more thorough look.

       
      To say that I'm concerned is an understatement. I have pics of the motor internals pre-rebuild, and can confirm that this is definitely a new piston and replated cylinder. I also have all the old parts from the motor, so it does have a new cam, connecting rod, valves, and basically everything else I expected to have replaced.
      The builder "ran the motor briefly to confirm everything ran alright" and then shipped it back to me. I reached out to him with these pics and he said,
      The piston looks like this because he had it machined from 12:1 to 11:1 compression. The streaks on the cylinder wall are normal for one that isn't broken in yet. Regarding the valve impacts in the piston head: "My concern is that something may have passed through the cylinder. How does it run?" I've never run this motor. I can feel these streaks in the cylinder wall with my fingernail. Did he re-use a piston from some other motor?
      Is this dude jerking my chain or is this motor fine to run?
      He's a fairly well-known builder in the XR community and was recommended to me by guys in the (now-gone) XR650R forum.
    • By Jonas Reppe
      I got my XR600r dirt bike giving me a carb issue that I just can not get worked out. It starts first kick and idles well, throttle cracks off nice and crisp when you whack it, but if you ease into the throttle to just above idle it's a spit and sputter pile of shit! Lol. I can turn the idle speed adjustment up to a fast idle and it starts spitting and studdering just the same. Done a lot of research and it points to the pilot circuit. I put a rebuild kit in it and have taken it apart and cleaned it seriously 12 times now. I'm at the point of looking for a different carb body to try. They're about $100 though. A new keihn carb is $250 on eBay. Any thoughts? That pilot adjust screw doesn't seem to adjust anything until it's fully seated or falling out. It has ran ok in that idle to 1/4 throttle circuit before but it don't now. The last 6 removal/cleanings haven't made any changes, previous ones did improve the throttle snap when you whack it.
      The main needle clip is on the middle groove.
      I checked for air leak with some starting fluid when it was idling and seen no change to the way it ran, indicating no leaks. 
      Bike has stock jet sizes, foam filter, stock exhaust. 1,830' elevation here in South Dakota. 
      I'm baffled..
×