SOHC.co.uk Forums > CB750

1978 Carbs

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Stoko:
Hello, I have broken the overflow tube off the base of the No. one carb!! Is this repairable at all and if so how? Alternatively has anyone got a replacement they could sell me? Cheers.

royhall:
Welcome to the forum. CMS have them new if all else fails   http://www.cmsnl.com/honda-cb750f2-super-sport-england_model14689/16015-kn4-a10-chmbset_16015393004/#.WNF4qsCLSM8    Bit pricey but at least you can get one.

philward:
Welcome Stoko - enjoy this great forum.
I am having the same problem as the set of carbs I bought for my CR750 project have a few snapped off. I am going to drill out and insert a brass tube. Have ordered some brass tube off ebay -
 
http://www.ebay.co.uk/itm/391714801139?_trksid=p2057872.m2749.l2649&var=660788072575&ssPageName=STRK%3AMEBIDX%3AIT

Will either use the above as a friction fit or drill and tap M5 and insert a 'drilled down the middle' m5 brass screw -

http://www.ebay.co.uk/itm/322377605112?_trksid=p2057872.m2749.l2649&var=511329139968&ssPageName=STRK%3AMEBIDX%3AIT

- which will provide grip for the rubber tube. You only need to drill in a small amount, hence not disturbing the internal tubing

Stoko:
Thanks for reply! Thought about pressing it out and replacing! Are these just a press fit! Dosn`t seem to be much room for tapping before disturbing the inner tube! Cheers.

philward:
I think we would struggle to press such a small tube out. You have approx 15mm of casting - my plan is to drill in about half that - not to drill all of tube out (which would mess up the overflow height) - hence just inserting the part that the rubber tube goes over. Its worth a go as the worst case is we'll have to get another float bowl. Good luck

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