1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Mechanical Secondaries, Nikki.

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Old 12-07-11, 06:47 AM
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That looks good. is it hard to disasemble the carb to that point?
Old 12-15-11, 01:35 PM
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Originally Posted by Oneiros
The earlier the secondaries open the more bottom end torque you will get. When I experimented with secondaries opening around 10% throttle it was pulling hard at very low rpm as soon as they open. This has been confirmed by someone I spoke to about this, but they said in their experience the fuel economy almost doubled with this setup. ATM I modify the linkage arm and redrill the hole to get secondaries opening around 1/3 to 1/2 throttle.
i have a question regarding that statment, you said you get double fuel economy doing the secondary mech mod?
cause i thought with the secondarys opening up sooner the more gas gets dumped in the carb so your gas mileage goes down.
also what is the gas mileage that this guy with the modded carb is getting?
and before the mod?

sorry if i repeat somebody else or whatever just trying to get things straight in my mind
thanks
Old 12-15-11, 02:24 PM
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Have I over looked a "how to" thread on this topic? I just orderd a rebuild kit for my nikki and im looking to mod it the most I can for better use. Seems like all the old threads with how to's on stripping and other mods have lost picture hosting.
Old 12-16-11, 12:45 AM
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Originally Posted by snowbreaker
i have a question regarding that statment, you said you get double fuel economy doing the secondary mech mod?
cause i thought with the secondarys opening up sooner the more gas gets dumped in the carb so your gas mileage goes down.
also what is the gas mileage that this guy with the modded carb is getting?
and before the mod?

sorry if i repeat somebody else or whatever just trying to get things straight in my mind
thanks
That was referring to a special secondary mod that gets all throttles opening together. I have fuel figures in metric

12L/100km using normal mech secondaries
20L/100km using secondaries that open together with primaries
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