Head breather bolt size

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08-10-2018, 10:52 AM

Mchad

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Head breather bolt size

I'm seeing conflicting info, so I'm hoping someone here knows for sure. On my '99 FXR2 (80 EVO) what is the size of the breather bolts? I'm seeing 1/2" and/or 3/8" like the newer models.

Anyone know for sure? I'm trying to avoid disassembling mine to find out I have the wrong ones...

Thanks

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08-10-2018, 11:21 AM

Uncle G.

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1/2-13 UNC thread.

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08-10-2018, 11:29 AM

Mchad

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Quote:

Originally Posted by Uncle G.

1/2-13 UNC thread.

F! Not the ones I have. Thanks!

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08-11-2018, 09:15 AM

Uncle G.

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They're 1/2-13 on my remanufactured Evo (2002 build), as were the original heads ('94). When did they change?

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08-11-2018, 09:19 AM

Mchad

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Quote:

Originally Posted by Uncle G.

They're 1/2-13 on my remanufactured Evo (2002 build), as were the original heads ('94). When did they change?

I’m not suggesting they did. I was saying the pair I have are for a twin cam - that’s all. I’ve got to find a set that are open (vented) on the head end, not the seemingly more common hex head style.

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