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bartsscooterservice

mechanical throttle linkage, what's the problem ?

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    As I indicated earlier, I took my carbs off and have been going through the linkage bits to ensure everything is working properly. Besides discovering that my carb heat tube was completely plugged I found that the Nylon bushings of the bell crank were super snug on the support shaft. I had to pry the bottom one off, its like they shrunk down over the years. I ordered some new ones from MS and they turn like butter.

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    I remember back in the day I worked in a Z car junk yard, and I had every make an model at my disposal. So I mixed and matched pieces from 240's 260's, 280's and Maybe even 280ZX's and solved it 95%, but it seemed that the last pivot above the throttle linkage had the most amount of resistance. If you can duplicate that last item with a set of teflon lined heim joints (spherical rod end bearing) that makes a BIG difference. Also, if you have the resources to press the factory bushing out of the intake manifold boss and bore it out to accept a needle bearing and seal from a parts shop, that might solve all of your problems.

    But many above are correct, the beginning of the travel for the factory linkage is a bit over-center and it makes the initial depressing of the throttle abrupt if the pivots are not lubed properly.

    I 100% stock is your goal, I remember graphite on the bronze bushing in the manifold/carb helped. A filling each nylon cup with synthetic lube helped quite a bit.

    Also you could have an oilite bushing machined by a local machinist pretty cheap, then pres it in the factory location. The raw bushing material can be purchased from McMaster Carr.

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    HUZZAH!

    Good for you man! Way to work through an issue!

    Yeah..it really works perfect now. It was like new carbs mounted...and when I pressed the pedal with running engine my jaw dropped to the floor on the difference it made...

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