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< Performance issues ~ Big Bore 822 cc

JohnK6

Posted: Sun Sep 11, 2005 10:57 pm

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Joined: 09 Sep 2005 Posts: 7 Location: netherlands

Hi, i just bought a 822 cc Big bore kit with cb900 pistons, (64.5 mm) do i have to change my carburators??, or is setting the gasneedle one clip lower okay?

carburators are from a cb 750 K6 with original main-jet

this is my dyno run with original motor (and a to soft back-tire), the 822 cc cilinder i'm going to mount this winter

the dynoman couldn't measure the right feul-air mixture (original 4 in 4 exhaust)

my icon is a cb 750 K7 with a lot of rust Wink

my cb 750K6 is my love Twisted Evil

Satanic Mechanic

Posted: Mon Sep 12, 2005 7:34 am

Moderator

Joined: 04 Sep 2005 Posts: 309 Location: Munich, Germany

JohnK6 wrote:

Hi, i just bought a 822 cc Big bore kit with cb900 pistons, (64.5 mm) do i have to change my carburators??, or is setting the gasneedle one clip lower okay?

For starters, I would stick with the stock carb settings, unless you also change/remove the stock airbox. Later on, you might try main jets one notch smaller and bigger, (and drop/raise the needle one notch) just to check the results.

Cheers,
Axl

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