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The TTR250 FAQ web pages -> TTR250 -> Carb stuff -> damaged thread
Post Info TOPIC: damaged thread
widge


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damaged thread
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Ok I messed up!

 

Somehow I managed to damage the thread in the float bowl for the drain screw.  I must have put it in cross threaded.  I the drain screw itself is damaged but more worryingly is the thread inside the bowl.  Any suggestion what to do?

Rob



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JOHNYBOY


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i dont think anyone will have a tap to restore the thread it is mega mega fine might be better off blanking it with new thread & copper washer

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ttr steve


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JOHNYBOY wrote:

i dont think anyone will have a tap to restore the thread it is mega mega fine might be better off blanking it with new thread & copper washer

 Good advice so farsmile



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mossproof


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I'm sure the thread size will be a standard metric one of some sort. If the thread will clean up that's half the battle. As long as the seat that the screw tightens against is ok, a new screw oughta do it.

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ttboof


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mossproof wrote:

I'm sure the thread size will be a standard metric one of some sort. If the thread will clean up that's half the battle. As long as the seat that the screw tightens against is ok, a new screw oughta do it.

 Agree



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mossproof


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Thread is M6 x 0.75 A bit rare (normal M6 thread is 1mm pitch) but it exists. You need a plug tap to make sure the thread is correct all the way to the end - a taper won't do it.
Here's one: (or you might find an engineering place that has one AND a helicoil repair if the thread is beyond saving. (Helicoil set about 50 quid is a bit much for one little screw!)

www.ebay.co.uk/itm/M6-x-0-75-HSS-Hand-Taps-Plug-Second-or-Taper/372598217148%2F8PNHtt9VX4%2Fw7FZcmMuqsX8uaFEduVY9J49oVls7SnzxUq68V2c%2FDSv029NsnuEu21iLaw94P88B7ZWMSsXUKmo8E1tFXjc0d2sgtG24Rw%2B2O1RfggTTRiyjUgWKT1JA5fpzNk13VvMWnswjQ2oiRdifU0zpG2IQnD5DlY5UuN9lRMiGC5QEasQl3z7FnMkIztWuAhHAKCb9wn6SzA%2B%2FAO1glKpkaKsJ2nZWVPbXeJ5%2BNA1OwRW8g3l3osfqwgXtf1SUfnisBAwXoRauhYGaGDTLKCe7%2FziBkJAp1e1UVeubgdJn8fUwGQIb0ZwvmsK1XN7MJac5XZe0n1JJ5VhRn6VB25jLhJl7h20aQxjnig3p0IVUg5g3nm8Inn6snx36%2FmukpIRp36TdFhEA1UD%2Fz%2BxqraBa4H%2F0oXa7mmWynFdUpa26R1FC74Vwx2dosA6rOu8Zq%2Bq1LZhxjEJNxrzXqURSefvdLM7uj7Q9mWxeWTt6ZaOeVcslWfSdfmC%2Fl%2B%2FtvuA6GhsFx3vs2djRhcnSELD8KVRRiOyL6iv29RMn64nEZo8lmP1IBm42ufY4HIUhzlyXxVEOZ8bkY6FH15ZGF38bEm0QhaSJOXvlpb%2FhuIzQgcAPJfsgMh6ar6q4r3U94pYEY%2Bw9HADjTAOnDfWh%2FLJmHwtmqNlEsFiEa9FMnjrWsRAJqjv2hRRoHu2MxAYBLnmnVwKYNueazMu9a0x%2FKUiiD2em4bP3KVdM4fVR%2FJuAfg2aM66rUSYW5bymj8zkVrQH4B9ikkNKfuAdLLbYL8kyl5gcO3cxpHd83It8UQBBRx%2B8qiCFsRrV%2FTAjc%2FVAZuVQ5q%2BLYAMGC63lZ5b5PGmG%2FCHpIzoZq%2FcWihVczWuSEK4vCckDa8Rkdf1VkzhYTsWb5QvJiFhONZJSSF9Q1BwQnJMc2RB3i1EoM9vXPT8aKzQhNV0Q%3D%3D&checksum=37259821714817efd769714c4d008f14c0af0ba17f65&frcectupt=true

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TTRfan


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Well found Simon!

For unobtanium taps, dies, etc, I use Tracy Tools. Next day delivery and never let me down. See here

The float bowl is worth saving as they also seem to be like unobtanium!  I have been trying to get hold of one to finish off a carb build for over a year now cry

Brian



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widge


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Thanks for all the replies i will let you know how I get on.

Rob

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widge


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Success!!

The thread bought the M6*075 plug tap. The internal thread cleaned up nicely. Fitted a new drain screw and spring from totally ttrs.

Thank you for all your help

Rob



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mossproof


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Great news. Thanks for the update.

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