Radical streetable engine size

geerbangr wrote: So is it better to invest the money in the KZ head because I already own one or get a J head and throw money at it What's the best bang for your buck. How about compression ratio, I don't see many talking about that. Ultra 94 Sunoco gas is about the best pump gas around. Where compression ratio do you start running into detonation issue with the KZ ? How about getting them started ?? Stock starter hold up to a 1327 or a 1428 ?

crh wrote:

geerbangr wrote: So is it better to invest the money in the KZ head because I already own one or get a J head and throw money at it What's the best bang for your buck. How about compression ratio, I don't see many talking about that. Ultra 94 Sunoco gas is about the best pump gas around. Where compression ratio do you start running into detonation issue with the KZ ? How about getting them started ?? Stock starter hold up to a 1327 or a 1428 ?

The 1327 I mentioned had a C&W KZ head on it previously with 36/30 and 8x cams. It ran a best of 6.0 with that head and usually 6.2 - 6.3. The J head was ported by a guy I know and it flows 95. I could fix that to bring it up another 10CFM with no problem.

Can you use your 900 head? Yes you can. Put 38/31 valves in it. Will it be optimal for a 1428? Not in my opinion but that's just me. Others will disagree

If you buy a big block kit from APE with big cams you'll be wanting to keep an eye on your valve springs too. . APE says 75 drag strip passes and it's time to swap them out. I use Kibble Whites for anything over 425 lift.

There are pitfalls to doing what you propose. Do things wrong and you best be prepared for disappointment and money pissed away.

geerbangr wrote: What the deal with the bigger engines leaking oil ?

turboking wrote: I guess I'm a realist :ohmy: and I know I'm opening a big ole can of worms here :evil: I don't mean to crush anyone's toes.... :lol: but IMO 1075 cc for the street ....no case boring.... big studs all the stuff your told you need to have and do.blah, blah, blah :dry: ......I'm not selling parts or work...... :pinch: make a cool rider kz that you can ride all the time ..... and it may be blasphemy to a lot here but invest your money in newer technology (2nd bike)....... I love old kawasaki z series bikes, cool looking, nostalgic..... but at the same time parts are becoming harder to locate at a decent price.....I already own a 1428 big dry blocked turbo Z ,not ridden much as it gets too hot.... :huh: but if I want fast , I go to another of my street bikes, my pump premium (93 octane) fueled (14 psi boost) 325 h.p dynoed intercooled mcxpress turbo hayabusa. ( best e.t. 8.17 @ 173 in the quarter with 14 psi boost ) there is no comparison between the 1428 Z and the stock bore 1300 hayabusa turbo....... I wish you could out do newer technology , I'm a realist... and like I said IMO :dry: :side: please, don't shoot the messenger/NO haters....:whistle: