Yoshimura R&D Superbike

I love to see the BIG BRAINS slug it out...very intresting thread...fly on the wall = me! good stuff guys....

Well if you think about it a wild fire spreads a lot faster across a flat field than it does if it has to climb over a mountain to burn the grass on the other side of it.
Thats the simplest way I know how to explain it anyway.

Round groove or flat groove cotters?

Match them to your valves you buy

wireman wrote: Match them to your valves you buy

I wish there was a "smacks myself in the head" smiley face... hahaha

:laugh:

mtbspeedfreak wrote: If you don't mind me asking Mark, how many times a month are you out on your KZ [it's an 1197, no?]? What compression are you running? Do you have 93 octane up there, or just 91?

How many other of you have bikes with extensive engine work that you ride? How frequently do you ride? I have a stock 903 that I ride everyday, when/if I do any engine work to it, it will be minimal as I don't want to lose ANY streetability.

i run my 1197 about 150 to 300 miles a week.its very common for me to hit the red line.
i can only get 91 octane on a regular basis, only a few places carry 93 up here.this is why i promote no more than 10.5:1 compression. i'm sure u know all about looking for that next gas station. lol i find that i need to plan my rides around gas stations so i would not want to run a bike that need special fuel, for fear of getting stranded somewhere.

Yosh 998 Slipper pistons, bigger valves, Mikuni 29mm VM carbs, etc:




Yosh 998 Slipper pistons, bigger valves, Keihin CR 31 carbs, etc:

told ya nobody peaks after 10K..... wait, second one peaks at 10,250



will look for the cycle mag article for you.

BohicaBob wrote: Yosh 998 Slipper pistons, bigger valves, Mikuni 29mm VM carbs, etc:

Yosh 998 Slipper pistons, bigger valves, Keihin CR 31 carbs, etc:

Chrome face top ring, cast iron second ring, 3 piece oil ring......can you say OEM Kawasaki boys and girls....geesh what a crock of advertising bullshit that is :whistle:

mtbspeedfreak wrote: Round groove or flat groove cotters?

Probably ultra expensive and a total waste of money unless you plan on living at red line when you ride. They look so cool but way, way overkill for a street motor. Shim under bucket is a total pain in the ass when it comes to maintenance. There's really no good reason to run it on a small bore street motor. You don't need that much camshaft to have a really strong pulling engine.

Put the money toward a brand new rack of carburetors and avoid the pit falls of buying used ones.

If you've never ridden a really well prepared fast KZ, I'll tell you this, you can't even begin to compare the performance of a stock one to a built one and I'm talking about non radical components used inside the engine.

LarryC wrote: Probably ultra expensive and a total waste of money unless you plan on living at red line when you ride. They look so cool but way, way overkill for a street motor. Shim under bucket is a total pain in the ass when it comes to maintenance. There's really no good reason to run it on a small bore street motor. You don't need that much camshaft to have a really strong pulling engine.

Put the money toward a brand new rack of carburetors and avoid the pit falls of buying used ones.

If you've never ridden a really well prepared fast KZ, I'll tell you this, you can't even begin to compare the performance of a stock one to a built one and I'm talking about non radical components used inside the engine.

I sent an inquiry to Yosh R&D asking for prices on all of the Z1 Yoshimura swag. Who knows, maybe we'll be surprised!?!? [Yeah right...]