Topic: 1974 Honda CB750

[jembers]

Started having some tech issues late in riding season. Had some help trying to diagnose it with no luck and next step is pulling carbs and cleaning them. Wondering if you guys know of any good videos online to help me through the process? TIA.

[ekpent]

 Never needed a video before but you are in luck as 750 round top carbs are the easiest carbs around to work on. Very simple with very few parts. A heat gun will be your friend for starters. Use it to heat the rubber manifolds well that attach them to the engine to make removal and install much easier. Use it to heat the bowl to get the drain screw out easier and best before removing from bike. Sounds like everything should be pretty descent in there if you were riding it last year. New fuel line while off would be a good idea and if you break the bank apart some new o-rings for the fuel tubes is a good idea. Don't mess with the big nuts on the top of the carbs for now. Make sure your petcock bowl and fuel tank is clean also so as not to defeat your effort.
   Your spark plugs may have a clue as to what is going on also. Sounds like tune-up time while your fiddling with it. Do you have a manual of some kind like a Clymers etc. ?
  What symptoms were you experiencing before you put it away ?

[MauiK3]

Hondaman’s book is a great resource to help you with the whole bike, especially the carbs.

[BenelliSEI]

Hondaman’s book is a great resource to help you with the whole bike, especially the carbs.

+1 to that.

[evinrude7]

Started having some tech issues late in riding season. Had some help trying to diagnose it with no luck and next step is pulling carbs and cleaning them. Wondering if you guys know of any good videos online to help me through the process? TIA.

if i recall correctly i stripped my carbs down and made sure to be very deliberate about laying everything out so as to remember what parts were what.  took a few phone camera photos as i went so i could refer to those when rebuilding.  like Eric said the round tops are pretty easy.  not as complicated as they appear.  be as thorough as you can.  double, triple check things.  you'll be surprised at your ability to handle this little job. 

[jembers]

Good question. Here is an earlier post I had made near the end of the riding season about what issues I was having. Next steps seem to be pulling carbs and cleaning them.

http://forums.sohc4.net/index.php/topic,184964.msg2141616.html#msg2141616

Never needed a video before but you are in luck as 750 round top carbs are the easiest carbs around to work on. Very simple with very few parts. A heat gun will be your friend for starters. Use it to heat the rubber manifolds well that attach them to the engine to make removal and install much easier. Use it to heat the bowl to get the drain screw out easier and best before removing from bike. Sounds like everything should be pretty descent in there if you were riding it last year. New fuel line while off would be a good idea and if you break the bank apart some new o-rings for the fuel tubes is a good idea. Don't mess with the big nuts on the top of the carbs for now. Make sure your petcock bowl and fuel tank is clean also so as not to defeat your effort.
   Your spark plugs may have a clue as to what is going on also. Sounds like tune-up time while your fiddling with it. Do you have a manual of some kind like a Clymers etc. ?
  What symptoms were you experiencing before you put it away ?

[MauiK3]

The carbs are pretty simple, that being said, cleaning the tiny passages is very important and not very easy to do. Have to be very diligent about making sure the little areas are clear.
Honda brass is important, aftermarket stuff is not that good.

[Carbon1]

Hi first time on this site and hope I’m in the right place. I have a 1974 cb750 and would like to know how much end play should I have on the drive pinion in the oil pump? The pump doesn’t seem to be pushing oil around engine and was wondering if the drive pinion was disengaging. Have posted a short clip and hope this may give some ideas to resolve my problem. I know I will have to pull the pump apart at some stage. Thanks.

[ekpent]

Hi first time on this site and hope I’m in the right place. I have a 1974 cb750 and would like to know how much end play should I have on the drive pinion in the oil pump? The pump doesn’t seem to be pushing oil around engine and was wondering if the drive pinion was disengaging. Have posted a short clip and hope this may give some ideas to resolve my problem. I know I will have to pull the pump apart at some stage. Thanks.

You might get some answers or help but your best bet is to start a whole new question thread with the title oil pump in it  Welcome to the forum.  Eric

[MauiK3]

Carbon
Hondaman's book has a great section about the oil pump. Pretty easy to follow.