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Hello, I have been battling a small vacuum leak on carb #4. I continue to adjust the air box, boots and carbs and just can't seem to close it up tight. It is like to boots are too short. They are all original and have no cracks. I completed a bench sync on the carbs and they are dead on. I...

Hello all, I have been riding my bike now for about 2 months after completing multiple maintenance items and cleanings. It starts right up without a problem, choke operates as designed and it idles just fine. The problem now is that after it is warmed up and I have been driving for a while, the...

Just an update.. The brake job went very smoothly and the wheel was removed easily as described above. I slid it forward, chain came off the rear sprocket and it has plenty of slack to just barely set the wheel on the floor after moving it back to remove from the bike. Then, the process is...

This makes sense, thanks both of you for the help. I just ordered the brake shoes, I will give it a try next week.

Hello, I think I am following you. What exactly are the pillow blocks? I am sure they are easy to identify if I were currently looking at the bike. Do I remove the chain off the sprocket to move the tire back?

Hello all, I have done some searches and nothing came up for a 750. The 83 750s have the quad pipes (2 on each side) The problem is that they are in the way of the rear axle removal. I don't see any way to do this other than removing the pipes, is there any other way to remove the wheel? Thanks

Hello all, I wanted to share some pictures and a quick background of my MC. I have been on the forum asking questions and getting information for the past few weeks and thank you to all who have contributed. My father bought the bike new in 1983 when I was 10. He drove me to sports and misc...

Thank you amc49 for all your input and suggestions. The choke is working as it should (as far as my knowledge extends) so there seems to be no problem with that. I believe I read in another post of yours to hold the throttle open a bit (do not twist). So today I turned the choke on and did just...

I see it. Looks like it was soldered closed by either my dad or someone who may have helped him in the past. Being this is absent, the hard starting may make sense. The fuel mixture screws are at 2. Something just isn't right. It takes about 10 tries and 3-5 minutes to start when cold. I am in...

Here are my carbs, After reserching your question, I do not have the AFV you mentioned, but there is a black inlet in the middle of carb 2 and 3, maybe there was one there and it was removed? Should anything be connected to the inlet?

Hmm. Well, even new when my father bought it he said he always had to give it a few twists to start it. (When the engine was cold) it never just started up on the choke alone. Maybe something has always been off?

Hello all.. What is the average turns of the throttle to get your bike started. I have an 83 CB 750 and it is starting ok once she gets some gas flowing. I don't want to flood it, but it seems like about 4 turns. Once I get passed that cold start learning curve, she starts right up the first...

That makes sense. Though, today it seems to be working correctly. It has not worked in years, maybe it just needed to work out some kinks.

Will try that out. Thank you!

Aside from running out of gas without a warning, is there any negative with always running on the reserve? I am just beginning my motorcycle driving and it seems odd that you would just run out if gas while driving if the petcock is switched to the ON position. It seems my gas gauge, unless...

To be honest, the RPM needle is very jumpy and an accurate reading can not be read. (Not sure if that can be repaired?) The needle jumps anywhere from 1-1500 RPM, I ran it again last night and I will continue to adjust it. The main point is that is does not stall at lower the RPM and is running...

Update.. Yesterday I received my new pet-cock. I had already removed the carb and did a check on all the jets and maded sure everything was free and clear. Adjusted the fuel mixture screws to spec and then I installed the new pet-cock. Magic happened! She started right up, idled perfectly at...

Hello, Thank you for the input. I used the "gunk removal" sold at the auto parts stores. I did not separate the carbs, where are the air cut off valves. I have them off the bike now as I decided to order the new petcock valve as that was trashed either way.

I can't tell what that is

The #1 cylinder is still running hot after backing out the fuel mixture screw as much as possible. My father, who purchased the bike new in 83, said the left side (cylinder 1 and 2) always ran hot, maybe that is just something to live with? Aside from sitting for 5 years, my father kept...

Hello, I just rebuilt and cleaned carbs thoroughly, they are in great shape. I have to rent a compression tester in the next few days as well as a carb synchronizer. The boots are in good shaped with no cracks, but they seem to not fit correctly. That could be one issue, I will compression test...

No one has ever had this problem? I pulled the plugs today and all 4 had a different outcome. #1 was practically white, running hot #2 was just right #3 has visible oil on it and was dark #4 was the darkest, but no visible oil. Is it possible that all 4 will need completely different...

Hello all, I am working on my 83 nighthawk 750 and just got her started after about 5 years of sitting. My biggest problem right now is a very rough idle and the #1 cylinder running very hot. It is seems to be changing color on the first bend out of the cylinder. What would cause excessive...