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Ok so there is no carb overflow now but still the cylinders were flooded. The GL1100 seat and float needle swap appear to have worked, however I'm still trying to identify the source of the problem.

Ok so it worked, I got the bike started, however when I left the bike for a few days when I tried it again it wouldn't start whatsoever. Looking into it now.

Yes I know, its the gasket that actually makes it look bad also, it is hard but actually perfectly clean other than the orange discoloration and doesn't leak so it'll stay on until I get a replacement. If I took the rubber gasket off it'd look much better. As for the needle jet I agree...

Ok I'm trying to get a work around for this, I pulled of the float valve seat from a CB500t (which is a very common part among other Hondas) it is much deeper and has a wider orifice than the TX650 valve seat and luckily it screws into the TX 650 BS38 carb (same pitch etc.). This allows me to...

They don't fit. XS-1 has a different valve and seat. http://www.xs650.com/forum/showpost.php?p=349112&postcount=32

I believe the XS-1 carbs have a different needle and seat to the later XS-2 and TX650 models. It is possible the GL1100 needle fits the XS-1 but it does not fit the XS-2 or TX 650, I have the parts in front of me. XS-1 seat and needle: https://www.mikesxs.net/product/48-1429.html XS-2 / TX...

I'm wondering whether or not the float valve seats can be interchanged from different models into the BS38s?

I'm lead to believe the XS-1/XS-1B has a wider needle seat than the TX650 and XS-2 (mikesxs sells different needles for those different models so there must be a difference). The GL1200/1100 float needles are too wide for my TX650 carbs and I believe XS-2 carbs also.

Its too wide. Photos attached. Please note I cannot confirm on the XS-1/B, according to Mikexs these are different, this is for a TX 650 '73. Annoyingly Mikexs wish to charge $45 shipping to the UK for the float needles, something I know costs $6 via USPS to the UK, I have managed to get them...

I know it's an old thread, vr3506 I just bought a set of GL1100/GL1200 float needles identical part number to yours. They do not fit on my '73 TX650 carbs, did you fit just the needle or the seats to them also? I'm lead to believe XS-1 carbs have different needles and seats to the later models.

Keihin 8353112 and GL1200 float needle does not fit the needle seat in a TX650 carb, at my expense I'm afraid.

I had a look at that thread and it suggests the GL1200 (and also same for many other bikes) float needle will fit on an XS-2. My only concern is the XS-1 and XS-2 float needles and seats are different to the TX650 ones. Mikexs and other sites seem to think so and yet other sites seem to think...

With all due respect I only read bits of that. The carbs have been completely refurbished, something I have done to maybe 5 pairs carbs in worse non working condition with success, had to replace float needles on 3 of those occasions but they were a lot worse than what I'm dealing with, these...

I got lucky with my CB500t when I built it and managed to fit brand new later nitrile tipped float needles originally made for another bike, effectively curing or considerably offsetting future float needle wear. I may need to replace the float needles on my BS38s from a TX650 and was wondering...

So far everything I've touched on the bike has been completely stock, so I'm not sure timing is going to be the first issue. In my little experience I've brought back bikes in worse condition just by sorting out the carbs and by not touching the timing which usually buggers everything up. I...

The floats are brand new..

Took me a while to get back to this issue. Right so cleaned out the carbs fully.. lemon bath, extensive carb cleaner and air compressor. So the passages are definitely clean. Tried to fire the bike up, it coughed once or twice while turning over extensively which I suppose is a result. I'm...

Yes but carbs first! :)

You mean on the carbs right? From experience I prefer not to remove these at least not initially, I did it one time on CB450 carbs and it ended up causing an air leak through one of the throttle shafts, it was incurable and was reported by other users of such carbs.

Glad you got it fired up :) Have boiled up my carbs with a weak lemon solution, then completely cleaned them again with carb cleaner and an air compressor. It is for sure nice and clean now and rebuilt. Hopefully will get a moment to try the bike again tomorrow.