What is this?

[Motorrad]

RPm is already making one...

[Sandblaster]

That's cool but I bet you could design a better one
Here is a link to RPM's site

http://rpmmfg.com/

[Sandblaster]

Motorrad needs to offer these kits:

http://rpmmfg.com/BigBoreStrokerKX640.aspx

According to the manufacture the 640 Big Bore Stroker build nets about 25-30 % more power then stock.
That's what, another 10-18 hp depending on how you measure it?
I'll bet a Motorrad built engine with a stock stroke would easily surpass that.
Of course you couldn't go around bragging that you were running a 640cc

[Motorrad]

Not religable enough for my standards.

Like I told oscar. any motor I build has to live through desert race seasons.

200miles nearly every weekend... many times a season is a bit harder on a motor than the 800ft sand drag guys..

[81cr450]

Hasnt RPM had the" we're making this" page up for about 2 years? Are they actually producing yet?

I do think modular production on parts like this would be necessary, like you have your 500 dome that works in both the KX & CR , same thing with the reed block , maximize the dimensions between the CR5 & K5 & just make a seperate intake plate. Ive been half tempted to buy the trx250 block & do exactly that. Really though the K5 is such a small niche, just look at the 2 or 3 cr500 sites compared to the one "KX" site.

[Sandblaster]

Point taken.
We are a dying bread except for a few younger guys with a real need for speed

[demographic]

For a start off I'll point out that these pictures are not of any parts of my bike, I do not own any of these parts and never have, its just that I spotted the pictures some time ago and copied them to my computer.
Like I say, I'm nosey and naturally copy pictures I'm interested in.
As a KX500 owner I've been hoovering other peoples cool pictures off the net for over a decade now, in the hope that they might some day be usefull to someone.
I can't even remember who owned these parts, might have been gwcrim off KXriders but I'm not sure. Fairly sure it was off a KX250 steel frame/500 hybrid.
Anyway, it might add a little detail to the picture.
Scott.






Think this ones on another cylinder, again I'm sorry but I never recorded who owned it but that extra brass hose connector looks a bit serious...
Looks to be a different insert alltogether.


Then there's these ones. They aren't off a 500 at all, if I remember right a bloke with the username of Lawnmowerman and are off a KX85 lawnmower racer him and a friend built
Pretty sure they cast the head using aluminium from Mahle diesel pistons.




There's a company in Europe called VHM that's been making heads with interchangable domes and what they call "High inertia crankshafts" for years now, never seen any for the KX 500 yet though.
http://www.vhm.nl/?navi=home

Looking at their cranks it seems that they are less adjustable versions of the Honda cranks with the snapring weights that can be adjusted.

[Sandblaster]

I've seen a lot of those pics around the net.
Thanks for posting them.
It wouldn't be hard for me to design a new head on CAD.
What is hard is getting someone with a CNC who is interested in making only a few of them.
That's the trouble I had with my 2 piece clutch cover....
It's also the reason why I ended up made one by hand...
Some day, I may actually make another