stuck screws on 92 carburetor brackets

nogalarry

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Mistakenly first posted in SOHC section...any tricks to getting these screws to budge? Tried pb blaster, no luck. Need to remove the carbs to replace o rings due to leaking fuel.
Thanks
 

RobG

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If they are the ones I’m thinking of they will be JIS - Japanese Industry Standard. If you haven’t got a JIS screwdriver already, I recommend you get one and use it in conjunction with the penetrating oil, and patience. I found the JIS made a difference. When they engage in the screwhead to undo they sometimes make a “click”. On my ‘96 carbs I bought one of those JIS screwdriver bits that fit into a holder which then fits a 5/16” t-handle....plenty of solid but careful leverage.
 
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