Has anyone Replaced the OS 25 muffler bolts?

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The Snake
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Has anyone Replaced the OS 25 muffler bolts?

Post by The Snake »

Has anyone replaced the OS 25 muffler bolts with button head screws yet?

I know we have done it with the 15's.

Same issue different engine.
Jimbo
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Post by Jimbo »

The great thing about the OS.25FX and the Irvine.25 is that unlike .15's they will run for YEARS with no trouble straight out of the box, as is.
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The Snake
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Post by The Snake »

I also keep loosing the carb screws too. Anyone know the size of that screw?
PROPPY JON
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Post by PROPPY JON »

VIC I THINK THEY ARE 5MM THEY ARE CHEAP FROM OS ANS I PUT JB WELD ON THE FLANG OF THE BOLT THEN TIGHTEN THEM DOWN AND YOU CAN REMOVE THEM BUT THEY WON'T COME UNDONE.THE MUFFLER BOLTS I DON'T HAVE ANY PROB OTHER THAN LOOSING THEM BUT NOT OFTEN .
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The Snake
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Post by The Snake »

Yeah I have had to order them too many times for the carb. Also the Stock muffler bolts need to be button head to be able to tighten them down better. I have them so stripped out on the p-40, I can't event remove them now.
Hat Trick
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Post by Hat Trick »

You need to get a JIS screwdriver. The screws on a OS are not phillips heads they are JIS. With the right screwdriver you can torque on them pretty well. Socket heads are definately better though.
jominy
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Post by jominy »

Victor,

You don't want button head screws. They have HALF the torque capacity of socket head cap screws. Socket head cap screws are available by the hundred from McMasterCarr online. Fabulous catalog. They have a thousand things you need. Check it out.

I have a zillion very hard, strong muffler screws for OS and I'll happily give you some next time I see you. Another good reason to come to the July EBRC event.

Grizzly
Hat Trick
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Post by Hat Trick »

Micro fasteners has 3mm x 25mm socket heads which is what you want for OS muffler screws. The JIS screwdriver helps a lot to but I really prefer the socket heads.
ptsullivan
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Post by ptsullivan »

I have replaced the JIS screws with DuBro labeled 3mm X 25mm Allen heads
and they fit just fine and are easier to tighten, the only drawback is
that the "stock" JIS screw will fail before the aluminum lug on the motor
fails so when you whack the muffler real hard you only lose the screws.
With the Allen head screws you rip the lug right off the side of the motor
or muffler. I have JB welded the lugs back together, but it is never the same.
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The Snake
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Post by The Snake »

Grizzly,
Sure I will take some if you got them, see you them!
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Air Scharnell
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Post by Air Scharnell »

Hello Snake,
As for your carb bolt problem, try some Ultra Copper High Temp Silicone.
Just enough on end of bolt will keep them snug, and seal any air leaks if the threads are getting worn.
Also works good on muffler bolts as well.

Frank
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