Re: Question: 1980 CB750F has carbs from a 900 - yes or no?

Posted by gonebiking-2 on Sep 14, 2008; 4:54am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Question-1980-CB750F-has-carbs-from-a-900-yes-or-no-tp458280p458285.html

Ok, It seems that all that work was for nothing. Next question is - how  deep is your wallet and how much money are you prepared to get it running right ????? With the 900 carbs, my sugestion for what its worth ,is to reinstall them ( after giving them a good clean out ) and as it is a very time consuming exercise taking them on and off all the time, take it to an expert or preferably someone with a dyno and let them do the tuning to get the 900 carbs to perform in the same way as the 750 carbs would have done. To me that would be the easiest way out.  I would question - if possible from the previous owner -  why did they put the 900 carbs on ???? I ask that, because one wouldnt go to all that trouble if there wasnt a serious problem with the 750 carbs. Try and find out what went wrong with the 750 carbs that made the previous owner go to the 900 carbs. Get as much information if possible to make an informed decision as to where you go from here. Dont give up as there is a solutin to every problem, and by the time you have it all sorted out , you will be a genius on the carb situation with these bikes. If all else fails and the $$$$$$$$$ question is not a problem, there are aftermarket carbs that are better than the Honda carbs that come as complete set, and just slide straight on - seen them on one of the many websites I have regarding carbs for this make and model bike.

To date, and I think I put it down to sheer luck that I havent had any problems with the my CB750K carbs, other then a full clean and replace seals and gaskets - normal routine servicing, but I suspect and have done so for quite a while, that the accelorator pump is not working and hasnt done so for years. Not that it matters , as once its warmed up and I dont need to have the choke out, she then goes like a rocket. No flat spots or hesitation- just goes. Keep me posted as I am sure your feedback will be of benefit to all of us who have these great bikes