Crafting a kr250a1 motor into a dirtbike frame ???

[EPApolice]

You could just buy a TDR and hammer a banshee motor in.

[Azza1980]

Wow I just read your link you realy should finish it (check out rd350 yz) on you tube it may give you some insperation to keep going with it

[hybrid]

No video of it running... two into one chamber..... nahhhhhhhhhhh.

[Jeram]

what do you plan to use the bike for?

[JonW]

Sounds like you have the know how to make it happen, I say you get started and have fun with it. It may not be mega powerful but it will be fun to do. Please do a thread so we can see your progress, you never know who will find inspiration from it, that's the beauty of the net.

[Azza1980]

I will be useing it for rideing bush.i have started makeing bits and pieces but till I get hold of a frame I cant do much more got the cash but cant find a roling frame in one piece whats the deal with 2into1 pipes do they work well I have never seen one on a bike can somebody shead some light on the subject

[Jeram]

Dont both with them. even a propoerly fabricated 2-1's will loose 10-15% top end, but will give a little more off pipe performance.

By the way, how are you going to design your pipes?
You will need some decent 2T modeling software to get a decent pipe design to begin with.

[Azza1980]

Thanks I will be useing a basic program I got online and I will check the sizes it gives me against some stock mx bike pipes to see if it looks somewhat simelar from what I have seen the program seems to give me a fair result

[Jeram]

No offense, but those 'basic programs' that you get online are complete and utter rubbish.

I would sooner chop up some stock KR pipes and re weld them to fit before I'd use one of those cheap n nasty pipe designers.

If you want proper pipes made, there is a member on this site who has the proper software and pipe making skills... and his pipes are pretty affordable too, but you'd need to finish the bike off first

[Azza1980]

I did think of reworking the stock kr pipes to fit or atleast use them to reverse enginer the new ones from.makeing the pipes is no problem tig welding sheet metal is what I do for a liveing and I realy want to make them myself but thanks for the heads up on the program being rubbish I will look into getting something better maybe there is a book I can buy

[Azza1980]

Ok finaly got a frame to put the motor in its a wr426 frame same as my motard bike first thing I will do is machine up a mount where the wr engine goes on the swingarm bolt and link that to the back one on the kr engine useing box section makeing sure the sprocket lines up nice then from there I can get the outher mounts sorted out

[JonW]

stick up some pics when you get a chance, would be good to see how youre going.

[Azza1980]

Yep I wanted to post some build picks but dont know how to from my phone just starting to get into engine mounts and working out the pipes

[JonW]

Just use photobucket or imageshack, simple to do and lots of guides out there on how to do it

[Azza1980]

Still working out the photos.been to busy reworking the frame to suit the new engine I ended up modifying the whole bottom of the frame and raise where the bottom rails meet under the the radiators so the front expantion chamber can fit threw