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Hamish

BK Mod

4 posts in this topic

Just wondering what kind accelerator pump duration other people run? Also, what jetting changes if any have others used? The pics on the motoman site show the screw a long way away from the acc pump stop, but the text says about 0.3 sec is the desired duration. :)

Hamish

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The squirt should be less than a second. 1/3 to 1/2 are talked about alot. The only way to tell the difference would be to film it and count frames. Mine is about 1/2 second and has no bog.

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Thanks, i'll try a longer duration when i remove the carb to do the Jamesnow mod.

Hamish

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The timing of this whole thing is really tricky. Make sure that you have the timing set correctly! The only way I could tell if the timing was correct was to set it to where I could see that the slide was wet, ie the squirt hitting the slide. Then wipe the slide, 1 sixteenth of a turn until it was missing the slide. After that, the duration was simple on my 00 (the diagaphram is a bad one for that year).

Alternative to the BK mod, you could order up the '02 diagaphram. I put a tech post in the YZ forum with the numbers, duration, etc from the 04 tech seminar book.

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