switching to 40.2 mm flatslide carbs from stock 38 flatslides on my mach z 780

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Started by headlayoutman1 at 10-12-2006 12:34 PM. Topic has 1 replies.

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10-12-2006, 12:34 PM

headlayoutman1

Joined on 04-26-2006
Posts 7

switching to 40.2 mm flatslide carbs from stock 38 flatslides on my mach z 780

	When switching to larger carbs, with no other changes, which way do you start with your jetting ? Leaner or Richer ? Just want to start testing from the right direction.
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10-16-2006, 4:41 AM

win809doo

Joined on 07-30-2005
Posts 32

Re: switching to 40.2 mm flatslide carbs from stock 38 flatslides on my mach z 780

	Always go richer! I would go up three sizes on the main jets. It is cheaper to replace spark plugs, then to replace pistons. You might want to watch your mid range also. Always check your piston wash after each change. Good Luck!
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