TOPIC:

Maybe this is a stupid question?
I have a Z1A engine wich have a bore 1015 and a "Stage 2" tuning(if that make sense)
Is it possible to use the original carbs,Mikuni 28 mm?
And if so,what jets should I use?

we need a bit more info to give you approx jet sizes, what pistons/cams/pipes are you running ect, not sure what stage 2 is...
Scott

Sorry,my question was a bit rash.
Just bought the bike as an "objekt".It´s a Rickman CR with a Kawa 900 engine.
I have not been able to track all the previous owners so I don´t know what kind of piston´s and cam´s it is.
All I know is that the bike has a history of racing many years ago.
The guy I bought it from also bought it in pieces and he had never started it.So I think I have some searching to do and then I´ll be back about this.
(Excuse my english,I´m from Sweden)

no problem, good luck tracking down your engine info

excuse my swedish ,im from louisville ne they cant understand me most of the time either! the 28s will be fine just need a few more details.

It should run with the 28mm. No big up in displacement. Won't have a "topend" rush but should pull nice thru lower part of rpm range. Need info on intake type, and exhaust type. I think 1 size up on mains for a 4-1 and 1 size up for intake mods. Am a drag racer so I don't think much about bottom end.

The intake is modified to around 32mm and the exhaust I don´t have yet but it will be 4-1 Kerker or Vance&Hines for street (if I don´t get my hands on a old Yoshimura system).
The cam lobes(right word?)on an original cam is rather pointed or "narrow" but on those cam´s they are more round or eggshaped so I suppose they are rather "hot".
So if I understand right I should try with 2 up on the main´s?

If you close the throttle slightly during a wide open throttle run and the acceleration picks up then you can go up on the mains.

Ron

Ron G wrote:

If you close the throttle slightly during a wide open throttle run and the acceleration picks up then you can go up on the mains.

Ron

i say we all need to see a close up of rons red bike:whistle:

I say we all need to see a close up of Ron's red bike

Click on the Red bike tab under the small Red bike pic wireman.