FR89 cam, lightened tuftried tappets bronze valve guides and ABT needles arrived today. that was speedy, under a week delivery. I tired to order the bare minimum of parts from Moss because of troubles in the past. This time everything appears to have gone smoothly.
The ABT needles should give a very similar, but somewhat richer mixture through the rev's. Below is a comparison between the two needles, BO being the stock. The ABT needles are actually HS4 needles but they fit HS2's just fine, you just need to use a punch to remove the needle from the brass seat, and smooth the knurled section under the seat. The extra length on the needle does not cause it to bottom out. Needles are installed in the carbs already.
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| BO in Piston, ABT's on the desk, one pressed out already |
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| Click Image to Enlarge |
Special Thanks to James Carruthers for his SU Needle Compare-o-rama App which compares needle profiles.
