Long time since I posted about this, so a recap -

XT600E 1995. I replaced exhaust headers with Motads s/s, cleaned up the cylinder head and renewed the carb mounting rubbers, after a lot of trouble with backfiring. Backfiring cured, but it's not running quite right yet. More reluctant to start, hard to get a steady idle, and when it's warmed up, the idle is way too high. If I turn the idle speed down, it won't idle at all when cold. Running at speed is fine, no power loss, all good.

Air leak was my first thought, but a check with a propane torch (unlit) arounf the inlets gave nothing unusual. I've dismantled the airbox and taken the carbs off to have a look. Here's the issue:

Coming from the top of the right-hand carb, just below the flange, is a tube with a thick black breather pipe. This is about 8"/200mm long and ends in a black plastic plug which looks like it ought to be fitted into somewhere. The natural routing of the pipe is back towards the top of the airbox. I realise now that when I put it all back together before, I must have missed this, and it has been dangling in fresh air between the airbox and shock. I'm wondering if this might be the cause of the poor idling. I know it's the wrong carb, but ...

The outlet and pipe aren't shown on the diagram in the manual I have, and I can't find anything on the web either. In fact, I have never seen one on a CV carb before, now I think of it. With the airbox loosened and moved back, I can't see anywhere obvious it would fit. (And it must have been fitted into something, as the end of it is clean and new-looking, whereas the middle bit of the plastic plug has road dirt.) I'm looking for a hole about 10mm wide, but I can't find one.

Any ideas?

Quick suggestions would be great, as she is in bits at the moment and I have to get to work tomorrow!

Thanks all.

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2006 XT660R daily ride, 1994 XT600E about to be reborn, Blog: http://goingfastgettingnowhere.blogspot.com/