Been a while since I was last on here.. Been way to busy with my other scoot. BUT now it's time to give my XS400 some long needed love!
Since my head gasket is leaking I have to change that one. So I thought, while I've already got the head off I might as well try and get some power upgrades done. I know this isn't a speed monster and can't be without NOS or supercharging it, and that's not what I'm after here.
I wan't it to be reliable and get a bit better low to mid end performance. I (almost) never try to red line it anyways, so I figured the power band most used is the one I should adress.
I've searched like a tool on this site to find some clear instructions on how to port the head, without using a flow bench or dyno (of which I've got neither). I know better than to just put the dremel to it and eyeball it, so I'd like some advice on this part. Anyone got any tips or pointers on porting the head?
I also wonder if there's enough material on the head (or cylinder) to have it ground down some to get a little more comp? Anyone ever done that? With any success?
And if I get some useful and good pointers on the port job (and maybe even the comp job) I might consider getting a new cam as well. This part is kinda pricey, $210 + shipping to Sweden, but if the other "low budget" things pan out, it might be worth it? If it doesn't interfear with any comp job to the head/cyl that is.
And last, maybe another set of carbs (just because I've just got these puppies all dialed in )? I've read about the GS440 carbs being bolt on, but will they ad any noticeable power gain? Or is there any other carbs that can be made to work? (Not spending a fortune on new CR carbs that is).
I have already got pods and hiflow silencers on it and I've dropped almost 50 lbs off it when I chopped it (yes, I weighed the chopped of parts and the new ones I put on it), so the natural next step would be porting, cam, carbs and maybe more comp.
I'm also thinking of getting new piston rings and stiffer valve springs while I already have it apart. Can't hurt right?
I'd really appreciate some good tips, pointers and ideas here.
Thanks in advance.
Since my head gasket is leaking I have to change that one. So I thought, while I've already got the head off I might as well try and get some power upgrades done. I know this isn't a speed monster and can't be without NOS or supercharging it, and that's not what I'm after here.
I wan't it to be reliable and get a bit better low to mid end performance. I (almost) never try to red line it anyways, so I figured the power band most used is the one I should adress.
I've searched like a tool on this site to find some clear instructions on how to port the head, without using a flow bench or dyno (of which I've got neither). I know better than to just put the dremel to it and eyeball it, so I'd like some advice on this part. Anyone got any tips or pointers on porting the head?
I also wonder if there's enough material on the head (or cylinder) to have it ground down some to get a little more comp? Anyone ever done that? With any success?
And if I get some useful and good pointers on the port job (and maybe even the comp job) I might consider getting a new cam as well. This part is kinda pricey, $210 + shipping to Sweden, but if the other "low budget" things pan out, it might be worth it? If it doesn't interfear with any comp job to the head/cyl that is.
And last, maybe another set of carbs (just because I've just got these puppies all dialed in )? I've read about the GS440 carbs being bolt on, but will they ad any noticeable power gain? Or is there any other carbs that can be made to work? (Not spending a fortune on new CR carbs that is).
I have already got pods and hiflow silencers on it and I've dropped almost 50 lbs off it when I chopped it (yes, I weighed the chopped of parts and the new ones I put on it), so the natural next step would be porting, cam, carbs and maybe more comp.
I'm also thinking of getting new piston rings and stiffer valve springs while I already have it apart. Can't hurt right?
I'd really appreciate some good tips, pointers and ideas here.
Thanks in advance.