time to do some research see if the cdi are interchangeable but only if the gsxr produces more power. and if so have a look at gsxr carbs over the across one?
I have already done this research so thank me later HAHA it took a while to find these specs http://www.motorbikes.be/en/Suzuki_GSX-R_250_1990.aspx vs http://suzukiacross.org/about-the-across/ ull see they both use same carb the mikuni BSW 27 IT KEEPS COMING BACK TO THE FKN CDI!!!! lol
so without me delving into the above is there a difference in the CDI's on the gsxr and the across or are they the same??? if the carbs are the same then its time to jet what you have.....or get a spare set and rebuild them at your own pace and then put then put them in... you could always look at putting a front end from a gsxr on to yours.......you'll have your twin discs then talk to @Stu he may be able to help you out with the front end and the carbs....
"so without me delving into the above is there a difference in the CDI's on the gsxr and the across or are they the same???" That's the big mystery. I will throw a pre 1994 gsx250f cdi in mind and tell you if I notice a difference. If you have a pre 1994 across I wouldnt bother and would imagine it would make no difference putting a gsxr250 cdi in.
If the Across is detuned the cams will give it away. Check the part numbers and timing figures. Can we get some more pics of that cute girl on the ZXR too?
Higher performance cams generally run more lift and duration. Those figures are usually in the service manual. Ok, you have to post all the pics up now
Ok noted. But with the unrestricted across vs the restricted one do you think its the cams? Any thoughts on that?
No idea. Just do your homework. Compare all the specs and parts numbers across the different models. If racing is your goal it would be better to sell the Across and start with a sports model.
You're not going to get much, if anything, out of a different CDI. That's the bottom line IMHO. A change in CDI and advancing the timing will work to a certain point - but to leverage it you're going to need serious engine work (ports, carbs/jets, cam work). And you can't guess or do a "trial and error" approach on that kind of thing. Get the timing advancing wrong and you'll get serious pinging or you'll lose power and be forever fiddling. Porting, bigger jets and a good tune will probably get the most out of your engine if you want to work on the same bike. But for that kind of cash *ducks in advance* you're better off simply buying a bigger bike. My 2c anyway. Take it or leave it I guess.
Totally fair and good advice! I guess my original thoughts were it's such a good reliable cheap bike that I wanted to get to the bottom of the 4kw loss restriction. It's been around for 20 years + and I can't beleive I can't find out why. A bigger bike doesn't resolve the problem anyway those 650cc tourers aren't really designed for racing. The 2fiftycc forum I would imagine is for solving problems like this for lams riders or enthusiasts who want the absolute most out of their bike. Trust me I got pwn'd by an r6 just 20mins ago, I would get one if I could legally ride it lol. But 250's still hold a special place in my heart and the across is a good bike.
My mates have 1000s and can't keep up with me through the mountains remember anyone can twist the wrist but a 250 needs to be ridden in right rev range and corner speed look at Simon from team tiger his best time isn't far off the avg 1000 round morgan park