Trying to clean the carbs but some screws see, to be seized. I've made liberal use of WD-40 on the screws but no luck. I'm in the process of extracting them out. Anything else I can do to get the screws out?

Some helpful advice here; good luck with this...

http://wiki.gstwins.com/index.php?n=Maintenance.FreeSeizedCarbScrews

once you get those screws out replace with stainless cap screws  as you will be into them again in the future  makes life simpler having decent screws  but be careful you can easily over tighten  .

Quote from: twinrat on August 10, 2011, 01:45:09 AM
once you get those screws out replace with stainless cap screws  as you will be into them again in the future  makes life simpler having decent screws  but be careful you can easily over tighten  .

You ain't kidding.  I replaced my diaphragm cover screws with stainless hex screws.  When I tightened them, I proceeded to crack the plastic cover around the screw holes.  It was a 26 dollar (replacement diaphragm cover) mistake due to not knowing my own strength combined with two-decade-old plastic. 

So, uh, yeah, be careful.

Those aren't phillips screws in the carbs.They are JIS screws.It helps to have the correct screw driver for them.The JIS screw drivers are more common than you think.There between $5 and $10.Google search will turn up the best deals.WD 40 really isn't a penetrating oil.It's a water displacer,hence WD and 40 is the number of chemicals it takes to make it.

Quote from: ben2go on August 10, 2011, 11:14:42 AM
Those aren't phillips screws in the carbs.They are JIS screws.It helps to have the correct screw driver for them.The JIS screw drivers are more common than you think.There between $5 and $10.Google search will turn up the best deals.WD 40 really isn't a penetrating oil.It's a water displacer,hence WD and 40 is the number of chemicals it takes to make it.

Really? They look so identical to Phillips screws. I guess that's why they wouldn't budge. I extracted two that I'll have to replace. Are the smaller carb screws JIS as well?

I thought the 40 in WD40 was the 40th formula they tried?

Quote from: adidasguy on August 11, 2011, 04:14:53 PM
I thought the 40 in WD40 was the 40th formula they tried?

Maybe.Gotta check the WD40 wiki.

Quote from: ben2go on August 10, 2011, 11:14:42 AMhence WD and 40 is the number of chemicals it takes to make it.

Actually, 40 is the batch/recipe number, i.e., the inventor made 39 previous attempts at developing a water displacement product before stumbling upon one that really worked well.

Quote from: rock_rebel on August 11, 2011, 03:47:53 PM

Really? They look so identical to Phillips screws. I guess that's why they wouldn't budge. I extracted two that I'll have to replace. Are the smaller carb screws JIS as well?

They're all JIS.

Quote from: bombshelter13 on August 15, 2011, 08:30:16 PM

Quote from: ben2go on August 10, 2011, 11:14:42 AMhence WD and 40 is the number of chemicals it takes to make it.

Actually, 40 is the batch/recipe number, i.e., the inventor made 39 previous attempts at developing a water displacement product before stumbling upon one that really worked well.

Cool.