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Pothole

Accelerator Pump Spring Tension??

5 posts in this topic

On my '99 YZ400, when I manually depress the pushrod cam while opening the throttle, I get a good squirt, but there is hardly any squirt if I don't depress it manually. Has anyone increased the spring tension of the pushrod to fix this problem?

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I haven't increased spring tension, but I have a similar problem on my 2000. If I manually apply pressure to the AP cam, it improves response (less bog) when I wack the throttle. I was thinking about doing the same thing, or decreasing the pressure from the diaphram spring :cry:

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Yeah, I've done a number of searches here on AP spring tension with no results. So, looking at it, it appears you can take the end of the spring that is hooked to the throttle linkage, bend it 90 degrees and rotate it 180 degrees clockwise (tighter) and hook it to the top part of the throttle linkage. I've heard from a mechanic that this was a trick they used with the older DRZ's, which had the same carb.

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Here's the fix remove the spring and cut it of at the bend for the A/P side and rebend it, this should shorten it 1/4 inch. I did mine and bam, no more dead spot.

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