Replacement JIS Screws?

[FiremanBob]

While trying to remove the tach drive cover I stripped out two of the Phillips-head screws and will probably have to drill them out. I imagine that most of the screws on this bike are similarly frozen and will condition them with PB Blaster and heat/cold cycles before attempting to move them.

Am I reading correctly that these are JIS threaded on my bike (1964, s/n 1039XX)?

If so, what is a good source for replacement screws of the proper type?

Every weekend in Hell Mr. Phillips and Satan get together for a few beers and laugh at us.

[Dogsbd]

I have this site http://www.mcmaster.com/ filed as a JIS source. I've not used them but I got the link from this or another old Honda site.

I'm sure someone with additional knowledge will chime in soon ;)


As for Mr Phillips and Satan, I am certain they're joined by the fellow who invented the plastic wrap used on DVD's and CD's.

[LOUD MOUSE]

If the screws are the ones that hold the tach drive unit on the left side of the head they are the usual metreic thread. .........lm

While trying to remove the tach drive cover I stripped out two of the Phillips-head screws and will probably have to drill them out. I imagine that most of the screws on this bike are similarly frozen and will condition them with PB Blaster and heat/cold cycles before attempting to move them.

Am I reading correctly that these are JIS threaded on my bike (1964, s/n 1039XX)?

If so, what is a good source for replacement screws of the proper type?

Every weekend in Hell Mr. Phillips and Satan get together for a few beers and laugh at us.

[FiremanBob]

Thanks, lm, that is a relief. I was able to avoid drilling by soaking the screws in PB Blaster for a couple of hours and then using a hand impact driver...carefully.

Your answer raises another question: which screws/bolts on the engine are standard metric and which are JIS?

My challenge for tomorrow night is to separate the baffle plate from the cylinder head cover. It's been soaking since before dinner but that gasket looks like it's vulcanized in place.

[jesmed]

On my 1965, the 6mm and 8mm are ISO, and the rest are JIS, as far as I know. Don't know if that holds for your '64.

As for the frozen bolts, you may already be doing this, but it seems to help if you first take the bit out of the impact driver, place it into the screw head, and smack it with a hammer a few times. Bill Silver recommends doing this FIRST before applying the impact driver, as the shock breaks the corrosion bond on the threads. If you don't do this before using the impact driver, you're more likely to strip or break the head. I used this method on all my frozen bolts and it worked every time.

[FiremanBob]

Thanks, Jesse. I did give all the screws a smack after liberally soaking them in PB Blaster. The impact driver has paid for itself, and they are all out. I'll compare the threads to ISO on my next run to the hardware store.

[jesmed]

Good work! Getting those danged things out is half the battle...The tach drive screw was the worst one on mine, too.