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CO2 front exhaust plug size

4633 Views 15 Replies 8 Participants Last post by  nextfriday
I recently had my bike at a dealer who checked the CO2 level, he had to drill out the old exhaust plug and replace it with a new one. After driving hundreds of miles around Scotland and returning home, I was changing my round cans back to the oval ones I normally run when the panniers are removed; and noticed a hole in the pipe where the plug should have been. I guess he didn't put thread lock on it, but have had to put a large bolt in the hole not threaded with a jubilee clamp to hold it in to stop the gases escaping.
My question is what thread and pitch size is this bolt as I can't find it in the torque setting of the service manual? this is an ST2 BTW.
I have one on an old set of down pipes I have but no amount of penetrating lub and an impact driver will shift it. The rear plug from the vertical cylinder is a different size as this one I could remove but it is smaller in diameter.
I'd like to fit one with a hexagonal head as I'd have more chance of removing it in future if it got stuck again.
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Turns out it was a 10 x 1 mm thread on the front pipe, nightmare trying to find a bolt shop or ebay selling the right size. I ordered a 10 x 1 and when it arrived it didn't fit, so purchased a thread gauge only to find they had shipped me a 1.25 pitch but they exchanged it with a 1 mm pitch and when I screwed it in found it jumping the thread when tightening up.
Not sure what's up with these bolts or if the thread isn't quite right after DG re-tapping it from 0.9 mm pitch to 1 mm pitch but resorted to putting in a spare oil sensor which turns out to be the right thread size, It looks a bit odd sticking out of the pipe as it's the NAPA type with a big spade connector on it and a 26 mm nut size.
It'll do to plug the hole until the right bolt can be sourced.
The oil switch has a diaphragm of some sort in it. It would bet that it will burn through quickly.

Have a good one.
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