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Super Tigre G21-46 and G21-60

Old 10-01-2011, 07:53 PM
  #1  
john47
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Default Super Tigre G21-46 and G21-60

Im trying to find out the size of the head screws and backplate screws for these engines so that I can replace them with socket head screws. These are the original Italian made engines and I thought they would be metric , tried 3mm - too small ,3.5mm- too big anyone got any ideas ?????
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Old 10-02-2011, 01:55 AM
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Default RE: Super Tigre G21-46 and G21-60

Most likely 3.2mm, give it a try
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Old 10-02-2011, 03:52 AM
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Default RE: Super Tigre G21-46 and G21-60

John, when I get home from Church I'll pull a backplate bolt from my G21 .46 and measuree it in a Screw Checkr.
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Old 10-02-2011, 04:45 AM
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Default RE: Super Tigre G21-46 and G21-60

Please try 1/8 screws in the 46. I used this thread screw in my ST G 21/35 and worked perfectly
The G21 35 and 46 are from the same engine series, so I guess that the 1/8 thread will work perfectly for it too.
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Old 10-02-2011, 05:24 AM
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Default RE: Super Tigre G21-46 and G21-60

I know the G21 series screws are odd ball from normal metric sizes. I sold my engines years ago but I never found the proper socket head screws.
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Old 10-02-2011, 10:49 AM
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Default RE: Super Tigre G21-46 and G21-60

John, mine has m3's in the backplate, the head has 6-32s indicating I tapped them from the original.
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Old 10-02-2011, 01:06 PM
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Default RE: Super Tigre G21-46 and G21-60

Thanks to all , I found out the size 5-40 or 1/8W-40. This is an oddball size the only difference between the screws are different pitch angles 55% versus 60%. Thank you all again
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Old 04-21-2013, 01:23 PM
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Default RE: Super Tigre G21-46 and G21-60

hI:

yES, 5-40 SCREWS WILL WORK GREAT IN THE st G21 ENGINES!

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