Bushmechanic Mongrel 628 Trailbike

Hey Bushie,
About the Amsterdam street, i think you meant Nieuwekerkstraat, 'cause it means literally fuckkirkistreet, and there goes the reputation of the 5er BMW satnav
About the" alcohol map"i know for sure
But about the weight, are you meaning that it's streetlegal, with all the stuff on board?
That would indeed be very

Grtz Rens

p.s. About the sound thing, is badass the same as old fart !?

10000rpm
I see you have finished the running in period

Interesting stuff Bushie, esp the TPS vs AFR.

Hey there Bushmechanic.

Some very interesting stuff going on there, I love it!

I intend to start some mongrelling of my own, and I didn't know where to post. I will start a new thread when I start the build, but first I would like to ask a couple o questions. I'm hoping the collective experience of the more experienced tinkerers/modifiers/butchers/mongrellers/engineers/wizards might help make my experience go a bit smoother...

Regarding the cylinder heads, between the 01-03 big valve and the later heads, do the big valve heads flow better, or why did the change to smaller valves? Between the two heads, which is better performance wise?

Let me explain what I hope to accomplish. I want to take a 2004 FE450 and make a rock crawler bike for technical riding. I was thinking of using something like maybe KTM 450 exc RFS 89mm piston, and have a liner made. That should put me at about 350cc more or less. Could also maybe use 525 RFS piston, to give me about 420cc or so. I haven't had a look at the deck heights to see if it will actually work, but I think it could be done. I'm hoping to have a tractor like power delivery, like on them 230crf honda's or some such thing. Obviously the 89mm piston will be much lighter, thinking of the crank balance factor and all that, but thinking of the honda 230 again, and they have heavy cranks with light pistons, will I achieve that ultra smooth power delivery like that?

With a tuned down engine like that, would I notice any real difference in low down throttle response between big valve or small valve heads? Will the head be too big? If I remember correctly 89mm and 95mm KTM heads are the same...

Also, carb size? I have 38mm DelLorto, 39 FCR and 41 FCR.

What other mods do the guys use on the 380 builds?

Any thoughts, guys?

Nice " trick " again Mastahhh!!!

Grtz Rens

I think that's a prototype for a wand.

Be aware Plumpbob!!! He could cast a spell on you
Maybe just to try it

Cheers Rens

Bushie if you get around to turning those on the cnc mill, i would be interested
in trying one

Hey Bushie,

How is your prototype of witch broomstick doing?
And did you cast a spell on Sandra Yet? LOL

Grtz Rens