Best, Piston/Valves?...

woolster72
Profile picture for user woolster72
Posts
54
Joined
5/19/2009
Location
Hobart, AU
woolster72
Edited Date/Time 1/27/2012 9:46am
Hey Guys, just wonder what your opinion is on the best piston, and valves.
As I have got to replace mine, also if you could give an approx price,in AUD or USD E.T.C,
would be greatly appreciated. =)
|
Cygnus
Profile picture for user Cygnus
Posts
14845
Joined
8/15/2006
Location
Hanover, CO, USA
Cygnus 7/7/2009 5:45am
7/7/2009 5:45am
OEM !
ACMYERS
Profile picture for user ACMYERS
Posts
865
Joined
3/21/2008
Location
Zeeland, MI, USA
ACMYERS 7/7/2009 5:56am
7/7/2009 5:56am
I'd go with a JE piston. Not sure on the Honda Valves though. Williamsmotorworks (on this site) Makes some dimple valves.
CamP
Profile picture for user CamP
Posts
6826
Joined
8/16/2006
Location
Colleyville, TX, USA
CamP 7/7/2009 7:00am
7/7/2009 7:00am
OEM Honda x 2
Matt Fisher 7/7/2009 7:49am
7/7/2009 7:49am
For longevity, the OEM valves can't hold a candle to the aftermarket stainless steel ones. The aftermarket ti valves are higher quality too.

The Shop

See All »
CamP
Profile picture for user CamP
Posts
6826
Joined
8/16/2006
Location
Colleyville, TX, USA
CamP 7/7/2009 8:17am
7/7/2009 8:17am Edited Date/Time 7/7/2009 8:17am
Matt Fisher wrote:
For longevity, the OEM valves can't hold a candle to the aftermarket stainless steel ones. The aftermarket ti valves are higher quality too.
I disagree. Both my CRF's have gone over 150 hours, with no shimming, on the original OEM Honda valves.
ACMYERS
Profile picture for user ACMYERS
Posts
865
Joined
3/21/2008
Location
Zeeland, MI, USA
ACMYERS 7/7/2009 8:19am
7/7/2009 8:19am
250F or 450F?
Tiki
Profile picture for user Tiki
Posts
10680
Joined
8/1/2006
Location
Corona, CA, USA
Fantasy
623rd
Tiki 7/7/2009 8:59am
7/7/2009 8:59am
See my post in your previous thread. RHC Valves/OEM piston and rings.
ACMYERS
Profile picture for user ACMYERS
Posts
865
Joined
3/21/2008
Location
Zeeland, MI, USA
ACMYERS 7/7/2009 10:13am
7/7/2009 10:13am
Tiki wrote:
See my post in your previous thread. RHC Valves/OEM piston and rings.
Ron usually uses JE high compression pistons...Tiki is right about the head RHC makes some great heads. Ours was bulletproof.
Matt Fisher 7/7/2009 10:21am
7/7/2009 10:21am
Matt Fisher wrote:
For longevity, the OEM valves can't hold a candle to the aftermarket stainless steel ones. The aftermarket ti valves are higher quality too.
CamP wrote:
I disagree. Both my CRF's have gone over 150 hours, with no shimming, on the original OEM Honda valves.
I didn't say the OEM valves were physically incapable of going 100+ hours, but from a longevity standpoint, they are nowhere near as good as the SS ones.

If reliability is the top priority, the OEM valves are not the best choice.
dr516
Profile picture for user dr516
Posts
587
Joined
7/10/2008
Location
Visalia, CA, USA
dr516 7/7/2009 10:58am
7/7/2009 10:58am
OEM
lapper
Profile picture for user lapper
Posts
134
Joined
4/1/2008
Location
Huntingtown, MD, USA
lapper 7/7/2009 1:44pm
7/7/2009 1:44pm
I'm running JE pistons in my 450 and 250 based on Ron Hamp's (RHC) recommendation. Very happy with them.

I got 60 hours out of the 450 OEM Intakes. They never changed for the first 45, but as soon as they started to move, they needed to be reshimmed every 2 hours. The bike has more power than I can use, so I went for longevity. Kibble White Black Diamond SS Intake and Exhaust valves/springs. No adjustment in 50 hours. I think everything was about $350 USD

When I saw the first movement on the 250 at about 40 hours, I Immediately replaced the Intakes with Faction MX Valves/springs. No adjustments after 30 hours. I think the kit was around $180 USD. Exhausts are still OEM and have yet to move.
woolster72
Profile picture for user woolster72
Posts
54
Joined
5/19/2009
Location
Hobart, AU
woolster72 7/8/2009 4:36am
7/8/2009 4:36am
ACMYERS wrote:
250F or 450F?
It's a 2005 CRF 450R
woolster72
Profile picture for user woolster72
Posts
54
Joined
5/19/2009
Location
Hobart, AU
woolster72 7/8/2009 4:43am
7/8/2009 4:43am
Matt Fisher wrote:
For longevity, the OEM valves can't hold a candle to the aftermarket stainless steel ones. The aftermarket ti valves are higher quality too.
CamP wrote:
I disagree. Both my CRF's have gone over 150 hours, with no shimming, on the original OEM Honda valves.
Matt Fisher wrote:
I didn't say the OEM valves were physically incapable of going 100+ hours, but from a longevity standpoint, they are nowhere near as good as the...
I didn't say the OEM valves were physically incapable of going 100+ hours, but from a longevity standpoint, they are nowhere near as good as the SS ones.

If reliability is the top priority, the OEM valves are not the best choice.
So would you guys go with the titanium or the stainless steel valves?mainly for bush riding and the ocasional race,would prefer reliability and for them too last a while, rather than a performance part, as being 15, price is an issue, as I pay for everything... Cheers for the help guys Smile . Happy trailsSmile
Matt Fisher 7/8/2009 8:13am
7/8/2009 8:13am
The SS valves are slightly heavier, and in some (but not all) cases will need stronger valve springs. The added mass may cause the engine to rev ever so slightly slower, and some riders feel it smooths out the power delivery. For a pro level racer on a MX or SX track, that would be a liability, but for most riders, it's not.

If you cannot stomach the thought of the engine loosing even a tiny bit of "snap", then use the aftermarket ti valves. They are higher quality than the OEM stuff, but do cost more.

In either case, make sure your valve guides and seats are in good shape, and verify that the factory seats are compatible with the aftermarket valves of your choice.

The simplest route is to just slap on a new, stock head. I think you can put a newer head on the 05, but I'm not sure. If using a stock head, it'd be logical for it to last roughly as long as the original one did.
Cygnus
Profile picture for user Cygnus
Posts
14845
Joined
8/15/2006
Location
Hanover, CO, USA
Cygnus 7/9/2009 3:12pm
7/9/2009 3:12pm Edited Date/Time 7/9/2009 3:13pm
woolster72 wrote:
So would you guys go with the titanium or the stainless steel valves?mainly for bush riding and the ocasional race,would prefer reliability and for them too...
So would you guys go with the titanium or the stainless steel valves?mainly for bush riding and the ocasional race,would prefer reliability and for them too last a while, rather than a performance part, as being 15, price is an issue, as I pay for everything... Cheers for the help guys Smile . Happy trailsSmile
I would say the SS for you application is probabaly the best bet. I have heard good things about the kibblewhite.

Post a reply to: Best, Piston/Valves?...