I picked up this 2003 Suzuki z400 the other day and i couldn't pass it up for the price. its got a 440 big bore kit, hot cams cams in it, yoshimira exhaust (just saw one for $579 on sale) jetted carb, nerf bars, dg front bumper, and a aftermarket axle (blue steel? brand maybe)

but the bad it froze over winter and was run hot and the head is cracked. the rear caliper is seized and is missing bolts here and there.

so i pulled it apart tonight and i'm going to see if i can get the head just sent off and welded up if not i've seen heads for $200-600 and complete motors for $400-1200

but i only payed $100 for the atv and no its not stolen. i know the guy, he needed money and i got the title with it. but i can quadruple my money even if i just part it out

well here's some crappy cell pics
yesterday:



Today:

 

got a good deal. must be super cold where your at. pictures are all foggy. should just get a new used head seeing as you got the bike for dirt cheap

 

no not super cold just a really scratched up lens on my droid i think it was around 75 today haha.

and yeah im looking for a good used head for cheap but they seem kind of hard to find one in decent shape for under $300

 

nice find man, those z400's are good 4wheelers and not to mention a blast to drive!

 

thats what i've heard i can't wait to get it all back together.

but i have the motor all pulled apart now the head is definitely toast with a total of 2 GIANT cracks and the jug is pretty scared up in one section but i think im going to just hone the cyl and if its not way out of tolerance just go with it and hope it doesn't burn alot of oil but if it does it is a $100 four wheeler haha

but when this motor does let go im thinking stroker, big bore, and a race head or maybe just a newer model FI motor swap.

 

How's this coming along?

 

eh its coming i have the subframe off and ready for some paint or powder coat right now. I still dont have a head for it yet but hopefully i'll have one by the next 2 weeks

 

The head is the same as the dirt bike motors around that same age. You could use a DR-Z or DR-Ze head. Do you know which big bore kit it has in it? If it's a sleeve style (Wiseco) you can hone it but if it's a plated style (Cylinder Works) you shouldn't try it.

I did a big bore stroker build on my wife's Z400 a couple years ago. It flat out rips. We go to the dunes around Colorado, Utah, and Idaho a lot, and it needed more gitty up for the big stuff. It's a 470 now with Stage 4 Webb Cams, 12:1 JE piston, FCR 39mm carb from a YFZ450, and a Dynatec ignition.

There are tons of forums out there for these quads, but I like Suzuki Central.

Good luck with it.

 

i bought a head from someone a couple months ago on suzuki central actually but i still haven't messed with it in the past month. Ive been busy working and i totaled the yota and bought a 99 dodge so my time has started going into that now