1982 cb 750f

[woozybigfoot]

I've got a question about the jets in relation to the exhaust on my bike. It had a 4 to 2 exhaust on it and I believe this bike came stock with 4-1 Exhaust on it. How do I tell if I have the proper jets on the bike.

 

[brettp]

Look at partzilla for your jet numbers.

 

[woozybigfoot]

Look at partzilla for your jet numbers.

Can you explain this to me better. This is my first project bike

 

[brettp]

Partzilla.com
Go there, choose your bike, look under the carb diagrams, and find the jet numbers. Easy day

 

[woozybigfoot]

Partzilla.com
Go there, choose your bike, look under the carb diagrams, and find the jet numbers. Easy day

That doesn't tell me if I have the right jets compared to the exhaust I have...

 

[brettp]

First, nobody knows what jets you have anyway. You, and only you, will know by opening the carbs. Secondly, not all exhausts are the same, so you need to learn how to examine the spark plugs; they will tell you whether your jets are correct or not.

 

[woozybigfoot]

First, nobody knows what jets you have anyway. You, and only you, will know by opening the carbs. Secondly, not all exhausts are the same, so you need to learn how to examine the spark plugs; they will tell you whether your jets are correct or not.

That's what I'm asking is how do I tell what jets I have and how do I tell it they are the right jets based off of the spark plugs. How am I supposed to learn if I ask a question and get told to go look up parts on a website. It is a very useful parts listing website but what I'm asking for is how can I tell by looking at the parts in question wether they are right or now..... First time bike owner first time working on a project like this as well. Quite literally day 1 of said project.

 

[brettp]

Ok, gotcha. I'm going to try to break things down for you. From a big picture level. You are going to have to do some research on your own. I'm not talking down to you, believe me we've all been where you are, but you are asking questions that have a couple layers of knowledge needed before you get to your questions.
For instance, you asked how to find out what jets you have. But you haven't taken the time to research for yourself what a jet is, where they are in a carb, how you know what number is on them, etc. We would have to walk you through tank removal, air box removal, carb removal, etc. before we even got to your questions. Sorry to tell you, but you have to research some things and watch some videos; there are many things needing to be done before we can get to your questions.

 

[woozybigfoot]

Ok, gotcha. I'm going to try to break things down for you. From a big picture level. You are going to have to do some research on your own. I'm not talking down to you, believe me we've all been where you are, but you are asking questions that have a couple layers of knowledge needed before you get to your questions.
For instance, you asked how to find out what jets you have. But you haven't taken the time to research for yourself what a jet is, where they are in a carb, how you know what number is on them, etc. We would have to walk you through tank removal, air box removal, carb removal, etc. before we even got to your questions. Sorry to tell you, but you have to research some things and watch some videos; there are many things needing to be done before we can get to your questions.

I took the cup off the bottom of the carb yesterday and all I did was clean the jets up good with carb cleaner I'm trying to avoid a 4 carb rebuild. I did see there were numbers on the sides of the jets and I do research what exhaust was on the bike originally which is what is on there. If I'm remembering correctly both the main jet and the pilot jet were the same number. But anyway I've got a different question now cylinder 2&4 spark plugs seem to not be burning the fuel as efficiently as 1&3 we've got it in mind that the coil pack and cables should be replaced before we just tackle a total carb rebuild is there a recommended website to order them from and a recommended place to order a good quality carb rebuild kits? Just want the carb rebuild kit on hand if the cables and coil pack doesn't fix the issue

 

[Motogrady]

On the coil thing swap the coils with each other. See if the problem follows the swap.

Plugs, if the electrics are good, oily or sooty, or even black too much fuel at tips of plugs. Light tan or brown good. White the cylinder is starving for fuel.

Some guys just ride them a bit, when they get back to the garage the pull them and see what color each plug is.
Some guys ride them a bit, then run it wide open down a straight. Pulling off, shutting the bike down immediately, and pull the plugs right there on the side of the road.

Lowe’s Hardware has an infrared ( sp?) thermometer gun you can just shoot the exhaust headers and see the difference in temps.

The bike just might need the carbs synchronized.

Start off with swapping coils maybe.

Good luck guy.

 

[brettp]

Agree with the coil swap. If the problem stays with the same cylinders, then you likely still have a carb fuel delivery issue.