Recent content by Old Okie

Well, you are not rid of me yet. While tinkering with this bike I discovered that cylinder 3 and 4 are not running as they should, after some investigation I think I have some bad spark plug caps, more on that later. My question today is, does the 1978 CB750F SuperSport have tube type tires?? I...

This bike belongs to a family member, he has an uncle who is experienced with 4 cylinder Hondas and the uncle may finish this bike. I have spent too much time and energy and forsaken my other duties while trying to get this bike to run. The other party will likely continue with the info we have...

And the answer is, No change. The air box was a pain to install, it would not go forward enough to fit the support bolts. The rubbers are soft and I lubed them generously. and finally pushed had enough to get it on. What I have done so far.. cleaned the carbs twice, air screws 1 turn out...

I'm back. I have cleaned everything I can and tested the fuel level with the clear plastic tube method. All bowls check withing the 2mm to 4mm below the top of the float bowl, so that is good. I can see no reason that this bike will not idle. I did see one bit of info that may help me understand...

The air screws are set at 1 3/4 turns out. I have not synched the carbs. I have not separated the linkage so they should be pretty close. I can not sync the carbs until I get it to run a little better. There is a tiny hole in front of the slides. Where does it go?? I have blown carb cleaner...

No more leaks, the drain screw was loose. I have the carbs off the bike again and will check actual fuel levels tomorrow. The floats are set with a gauge at 14.5 mm so we will see how that relates to the real fuel level. I had to get new clear plastic fuel line, what I had was not fuel line...

This where I got to today... Some progress, accel jets are working, still no idle, runs good above 2500 rpm. I will try to post some pics. Pics did not work, float level by the clear tubing method, #1 is about 1/4 inch below the top of the bowl, #4 is slightly higher. Fuel levels may be below...

How did you remove the accel jets?? I probably need to do that, I have been advised not to remove them but they need cleaning. Did you remove the hoses in the rail to the accel jets?? Some progress, accel jets are working, still no idle, runs good above 2500 rpm. I will try to post some pics...

These are the original float valves but #4 has caused trouble earlier. I may have a replacement for #4. What is the proc edure for setting float heights?? Some say 12.5 mm and others say 14.5 mm?? Where does the tiny hole in front of the slides go???

Yes, I am still working on this bike and getting no where. Frustration is setting in, she is still not running. So far I have checked the compression, 120 psi, low but should run. New spark plugs. checked valve clearance. removed carbs from the engine(left the rubber on the engine) and cleaned...

Yes I understand the accelerator pump, I guess I was thinking out loud with that question. I will be able to set the timing, I think. Not too worried about the timing or carb sync, the bike was running when parked. My main question is, how do I clean the idle circuit, is that part of the...

Finally back to this bike. How did I get so busy?? The bike has a Martek 440 ignition, I found instructions but the print is very rough and mostly unreadable. A good copy of the instructions for this Martek 440 would get me going again. From what I can read on the instructions there is a...

I will get back on this project on Monday. The bike has electronic ignition, a round black plastic module. So there is no points or any of that stuff so what do I use for determining TDC?? I have not looked at the stator side of the motor, anything there that I can use?? I need to download...

Been away for a while, lots of company this summer, problems with the weather, hotter than... Got back to the bike today and began with a compression check, very disappointing. 1, 2 & 4 at 120 psi, 3 @ 90/100. What does that mean and what are some of the causes?? I can do a lot but I am not...

Always one more thing....how are the cylinders numbered?? the plug wires are numbered with 4 on the left side of the bike, looking from the rider position. A place in the manual says the opposite, I think. So which is it??? With electronic ignition module I do not find the marks for timing...