china bike 122cc dohc 4 valve project

[themountain]

Originally Posted by tormentandglory

it'll be for dirt. i'm using the zxr250 cams, the valves are 19.5 and 16.5mm. I'm putting it in an xr50 :-)

wow...isn´t there any issue with the clearence to the front wheel...that head looks huge...or will you cut it down a bit??

[corey58]

very nice man one thing but, u got way to much spare time!!!!!!

[tubes380]

thanks cactus thats what i meant, why have these??? wouldnt it be better without as itll up the comp. and its not a smooth journey for the flame around those tight radius'

[tormentandglory]

Originally Posted by Cactus Jack

He's talking about the two reliefs at the ends of what appears to be a flame trough .... You've done a stack of work there mate ...... it's good to see someone having a go at engineering their own parts ......

You're spot on about the Jap parts being grossly over priced for what they are ....... and you're obviously a skilled tradesman who's fully in the know so you can see it whereas a lot of others can't .....

Ah, ok, I see what you mean. The chamber has only been rough machined. I'll finish it by hand with a die grinder when I get closer to completion. I'm aiming for 10.5:1 or 11:1 comp.
The cambox will be much smaller when its finished, I have to rip a hell of a lot of metal off it yet. I made sure I bought a block of alloy that was much bigger than I really needed. It sux when you get 1/2 way through something then realise that you don't have enough material to do what you need to.

[tormentandglory]

And regarding the jap parts, they are a lot better, but not good enough to justify the price. If you've ever seen the takegawa super R heads with the titanium valves and billet alloy roller rockers you'd see how much better the jap stuff can be.
I'm an auto machinist by trade, I built racing engines for 10 years but I've been working as a cnc toolmaker/fitter and turner for the past 5 years. Its a good mix of skills, and I have access to an awesome workshop.

[themountain]

AWESOME...I would love to do that too...would build my bike completely ...with looooots of strange, bling parts hehehehe

[darb110]

man you have some great skills and its good to see them going to good use

thats one hell of a great project and sounds like its got some good internals, im sure that it will run it will just be how well and not dout itll go off with flying colours ohh and its going in a xr so youll be right :P

good luck man, keeps us updated

[Jackyy]

Cool thing u do ,guy

[lilaidstamx]

that looks awesome.
how long have you been working on it for?

[DDR200supermotard]

man cnt wait 2 c it started up bro pretty sik it would b sik 2 work on good luck man