HRC Individual Part No.'s

[Thumpmeister]

I tried a search, but was only able to turn up a part number for the whole HRC kit for the 650R.

Does anyone know what the part no's are for the high comp piston, cam, and cam chain?

[XRMANU]

Voila...

Btw: Don't mind the red marks.

[AlwaysWot]

many thanks! I was also looking for this info

[Thumpmeister]

Where did you find that sheet? I have the service manual; did I miss that?

Holy crap that piston is spendy; almost 500 for that alone!

Has anyone come across a good hi-comp piston that keeps the standard bore, and isn't quite that expensive?

[XRMANU]

Where did you find that sheet? I have the service manual; did I miss that?

The HRC manual is part of the HRC kit.

[weskc35k]

Thumpy the HRC kit is a good thing but it is way expensive.

I just put in a stage 2 Hot cam decked the head,.matchported and some other crap and it's all good,cost me less than half of the price.

The stage 2 has more lift and duration than the HRC.

The only part i want is the tougher timing chain.

I am not a big big valve fan but if you want top end power ya gotta get the get go,i'm actually doing the HRC chain and going to a set of bigger inlet valves next step.

And why do we need this much power anyway dude?

[Ryanthegreat1]

You know by the time you buy all the parts for the timing chain upgrade you could buy the entire HRC kit. RonAyers has it listed for $898.74. Might have to order that.....

[Thumpmeister]

Me and my buddies do some pretty good climbs over here, and a lot of them have been in the soft sand, and I find my bike pretty tapped out with me on it, a full tank of gas, and in the soft sand doing a climb.

I don't need anymore low-end torque, I just need a little more on the top for the climbs. I always thought higher-comp pistons gave you more torque, but a lot of guys on here have said otherwise.

I was looking at the HRC cam, but thats pretty spendy as well.

I am mostly looking at this to see if I want to go with it for a future rebuild. Just getting some pricing ideas and input now. My other concern w/ the HRC kit and hi-comp piston is that I would have to run race gas, and I really do not want to do that; driving to the gas pump is a wonderful thing...

Just out of curiosity, does anyone know what the HRC puts you at for HP?

[clreede]

I've heard 78Hp, but I don't have any resources to site

[XRMANU]

http://www.xr-italia.com/foto/tecnica/banco%20prova/diagrammi/coppiacomp-650-hrc+.gif

http://www.xr-italia.com/html/tecnica/tecnica-xr650-provabanco.htm

between 7000 rpm and 7500 rpm: stock engine 43 hp,HRC kitted 51 hp

@ 8200 rpm: stock engine 39 hp,HRC kitted 49 hp ..that's 10 hp

quote XR-italia :.........." le differenze di potenza maggiori le possiamo trovare oltre i 7.000 giri, infatti a 7.500 passiamo dai 43cv della moto di serie ai quasi 51cv dell'HRC mentre a 8.200 giri andiamo dai 39cv della moto di serie ai 49cv dell'HRC, ben dieci cavalli di differenza.

# Il valore di coppia della moto di serie parte con un valore di 52 Nm raggiungendo il picco di 57 Nm a 5.300 giri, ma iniziando a scendere subito dopo" ......end quote.

[XRMANU]

I've heard 78Hp

[Thumpmeister]

You don't think 78 hp is possible?