HondaCB650

The CB650 ignition has two independent identical circuits for cylinders 1+4 and 2+3 with the plugs connected in series to one coil ( 1+4 to left coil, 2+3 to right coil). So in case of an electric issue typically both or none of each pair should fire. Anyway it is a good idea to check the cables and...

Welcome here! :D Poor cold start is quite normal for a CB650. Choke is required quite long compared to most other bikes and it easily dies on the throttle without choke when cold, too. For sure you found out yourself, too... :lol: also the revs don't seem to increased with the choke on- there is no ...

The T-vents are usually connected by a T into a single line that further goes to the airbox. The pressure conditions in the carb bowls (and therefore at the jets) depend on the T-vents and what comes behind. From experience of several people here it makes a difference whether they are just open or c...

K&N's usually shift mixture towards lean but your plugs look really all right. With air filters like that placed on positions shown in your pictures pressure conditions at your carbs might become strange, especially when you operate the throttle. Things may even depend on the positions of your l...

kerryb wrote:...I have taken a break to refurbish a house. Learned how to lay vinyl plank floor last week and my knees are complaining that I'm on them too much!

I use skating kneepads for this kind of work.
Often helpful for working on the bike, too. A clear must-have for me!

Getting good replacements for this part seems no new problem.
Someone even designed and made his own.

Great progress. Now you have a nice, straight top rear frame. The shock mounts look great and I assume it was tough work to make them fit that way. Do the coils still fit at their original mounts with the lowered tank? The piston carbs will not fit this cylinder head if you have the full array of fo...

The center cover (and at Z-model and '79 also side covers) are a bit special. The center cover is fixed with two of what you called "weird looking ufo bolts" some time ago. :lol: If you turn them in, the metal step at their bottom fixes and limits their position in the thread. More torque ...

There is no need or reason to deviate from book specs unless you really know what you do. Special fuel or special cams might be a reason for things like that. If somebody should run into valve overheat problems with book specs, this is probably due to too lean. And this is most probably due to pod f...

You will need a cam for the circuit breaker, too. So the crankshaft needs a modification, too. I think the mount of the pulser magnet is screwed into the right side of the crankshaft so basically it should be removable. Some people here got it out but I think that was not that easy because the part ...

Tommysparta wrote:.. or can I run the bike without the vacuum valve as long as I remember to shut off the petcock.

Yes, most previous models are just like that.
You should plug the vacuum nipple for this valve at the carbs however.

GeorgeSweety wrote: If you no longer need the side panels and they are for sale I would be interested.

It took almost one month until my patience was rewarded.

Ah, THAT nozzle, the "oil control valve". Well I put a wire through it. I highly doubt there anything in there. At most I scuffed up the top of it. I imagine it functions to pass oil through the middle and seal the hole within which it fits and if that's it both nozzles should operate jus...

I don't know what the "nozzle" thread is. ... On the cylinder bottom level you squeezed one of the calibrated nozzles for head oil supply. You did not get it out easily so you cut a thread and pulled it out. For sure debris from that work fell down into the hole below. This "hole&quo...

From the different online manuals I've seen in here(internet, other forums) the only other method that worked for me was put in one sprocket bolt, then the chain as much as possible, then crank/force it over to get the holes aligned for the last sprocket bolt. That worked for me. The other way didn...