So I know it's just a two fifty but i want it to perform and go fast haha who doesnt i want to increase power, efficiency, and impressiveness. So what are some engine mods that can accmplish this (money aside) whats your idea of a souped up 250?
If you mean the four cylinder 250's, they are already in a very high state of tune. 180bhp per litre for a bike that is 30 years old is quite a lot. Stick it on a dyno and see how much power you are missing before thinking about mods. I would be more inclined to spend money on making them handle, that is what gives these little bikes their edge.
But if its only in a straight line then I would do this ... https://www.2fiftycc.com/index.php?showcase/the-worlds-fastest-fizzer.53/
Well, whats yours? Do you mean throw most of the important bits required for correct running away and replace them with stupid POD filters and loud useless mufflers? Or are you thinking of increasing the efficency of the engine to give more power? Without some idea of where you want to end up, it is a bit difficult to tell you how to get there and what you need to do. Please let the forum know so that we may guide you in the right direction.
You have this re-sleeve and overbore - done on an FZR, though I suspect the Suzuki would be similar https://www.2fiftycc.com/index.php?threads/fzr150-bucket-race-motor.8949/ Lot's of time spent pontificating about the actual options in this thread https://www.2fiftycc.com/index.php?threads/overboring-an-fzr-fzx-options.8988/ Window shopping is free and surfing the net late at night looking at parts is safe if you can't remember your CCV while your wallet is in the other room
I did think about the gs400 engine swap and I had a quick look intyo it and apparently the engine swap is doable with a few chassis adjustments but from what I read it' the wiring that is the real issue with that now.
Cheers for the info guys I'll look into it all and see what what was done in these other threads. My bike is an 82 gsx250 I'd just like it to have a bit of balls something that make people look twice when they realize it' just a little 250. And I keep reading when other people have asked about 250 performance (not on this forum just internet in general) everyone say why would you waste you time with a 250 just buy a better bigger bike but why not do something thats a bit left field from the pack be a little different.
Mods for a 250 4 stroke? Lose a couple strokes! Mods for a 250 2 stroke? A new set of pipes for weight saving and power!
Also don' suppose anyone knows of any folk / triple tree upgrads for the GSX? I'e tried searching but havent come up with bigger all.
Well basically what others have hinted at is that the older 250s are pretty maxed out. Any mods to gain significant are way too much work and it's easier to just get another bike when you can. If you want to sound fast just throw on an obnoxious muffler. Don't get caught by the cops though!
For fork swaps measure what your fork and triple tree dimensions are then look here for comparisons http://litetek.co/Guide_USD_ForkDatabase.html From some recent reading I've done, Aprilia RS125 and some of the Hyosung front ends are popular swaps because they are available relatively cheaply - check the triple clamp offset though if you intend to maintain sane steering geometry Be aware that just swapping bits can be a PITA and end up being really expensive in the long run, so better an entire front end
As others have said above there really isnt any usable gain to be had out of 250's of this era... The GSX250 is a DOHC Twin with 10.5 to 1 compression (new) and twin Mikuni 30mm carbys so other than bolting on a turbo I doubt that you will get any usable power increase for any mods you do... In fact you would most likely affect the operation of the bike... a hot cam grind would make the bike a real slug off the line and only have power at the top end... the heads on these bikes are pretty good so no real benefits in porting and polishing other than port matching.. and then it will give an efficiency gain rather than overall power. There is a theme developing here... lol There is an old saying with bikes... nothing matches more capacity..especially with old bikes. If you really want it to stand out then look at mods to make it "your" bike.. there are plenty of bikes on the old interwebs (I watch too much Fast & Loud / Gas Monkey Garage) to take inspiration from. The link below is what can be done with these bikes... if you like the Cafe / Flat Tracker look. Take note... this was not modified for performance...the Velocity Stacks and exhaust are purely for "the look" and would make it a real bitch to tune.. Good luck with whatever way you want to go with it... These are a nice little bike.. http://www.returnofthecaferacers.com/2015/07/pop-bang-suzuki-gsx250.html
Ok well I think I get the picture that it isn't really going to be worth modifying maybe just a straight up rebuild to original specs. Thanks for the input and info
I think if you are prepared to spend a bit of time with a dremel / die grinder you could benefit from cleaning up the head inside the inlet port's and exhaust port's, remove any big dag's etc, and blend out the lip where the valve seat's meet the head casting inside the port's. Leave the intake side a rough stone ground finish, and the exhaust port's can be flat and shiny if you want to spend a bit of time polishing them up. Maybe match port the intake manifold's to the head too. And check if there are any weld's etc inside the exhaust pipe's that can be flattened off a bit. Once you're done, get the valve seat's recut in the head and valve's faced, or give them a valve grind if the valve's aren't too bad, then reassemble it with some new valve stem seal's.
