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Paddedcell100
Moto GP Alien Joined: 01 Nov 2015 Location: Northampton Status: Offline Points: 2591 |
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Posted: 06 Feb 2018 at 10:20 |
What size thread are the CO2 exhaust bungs in a oem gen 2 exhaust?
I know I can get new bungs from AP but I just want to know what size the thread isππ |
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Better to have something you don't need than need something you don't have....
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Spoonz
Admins Group Joined: 11 Feb 2008 Location: North Devon Status: Offline Points: 10726 |
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M18x1.5
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Paddedcell100
Moto GP Alien Joined: 01 Nov 2015 Location: Northampton Status: Offline Points: 2591 |
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No, the small ones I'm on about Spoonz, they look about m10.
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Better to have something you don't need than need something you don't have....
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Spoonz
Admins Group Joined: 11 Feb 2008 Location: North Devon Status: Offline Points: 10726 |
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Oh ok thought you mean the lambda port. Yeah M10x0.8
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Paddedcell100
Moto GP Alien Joined: 01 Nov 2015 Location: Northampton Status: Offline Points: 2591 |
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You're a diamond, cheers buddy ππ
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Better to have something you don't need than need something you don't have....
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SpannerMonkey
Moto3 racer Joined: 27 Mar 2017 Location: The edge Status: Offline Points: 34 |
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Thought it was 1/8th BSP same as gen1
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2000 RSV Mille (track)
2008 Tuono R (factory spec) |
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Spoonz
Admins Group Joined: 11 Feb 2008 Location: North Devon Status: Offline Points: 10726 |
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Depends who you ask as the service manual doesn't give a size. I know Griff qoutes 1/8 bsp and Af1 qoute 10 x 1 metric. Amauri told me it was an odd ball size if you measured it with proper gauges and fell between 1/8 bsp and metric. The upshot seems to be that the difference is so small to be as little as a loose or tight fit and both seem to do the job so take your pick. I know when I had to drill out the front one on my gen2, I re tapped it with 10 x 1 thread as I don't have Bsp anyway and an oem bung went in as normal. It seemed logical to me that an Italian manufacturer would use a metric rather than british standard for it's thread sizes as per the rest of the bike. |
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IanG
Premium Member Joined: 04 Oct 2010 Location: N Wales Status: Offline Points: 10725 |
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I did look into this a while back and I agree it's more likely Aprilia would use a metric fine thread rather than an old imperial pipe thread.
HOWEVER, I seem to recall that while the pitch is pretty much identical the thread angle is different. So a bit like 1/4" Whit and 1/4" UNC both the same TPI, but a good Whitworth bolt won't easily go in a good UNC tapped hole ( or Vice versa) I started cleaning my ex port with a 10x1 and it was very tight on the tap so I went back to a BSP and it seemed easier |
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