650 Mod's 78 Fighter Build

As you can see, the bottom two tube have met the highway a few times...

they definitely have the goods for exhaust fab thats for sure.

i have a custom exhaust planned for a non kz project that i plan to utilize one of these on.
www.lossaengineering.com/products/lossa-...er?variant=856209431
leon

yeah that header hangs down pretty far the way it gathers and stacks em right at the front don't help matters any .

almost seems like a kerker pulls up tighter.

leon

I like that can...

The thing that really makes this one bigger too is the size of the rear pipe. The collector does sit fairly low too. I think the Kerner would be a bit tighter. I've also had thoughts of using my stock down pipes and welding something custom up...

I have the same concerns with my Motogpwerks exhaust. At least it's a slip in with spring retention so I can take it off for oil changes.

Lucky...

Ok so i'm still haven't been able to get that one cylinder to burn clean on idle. This is the cylinder that runs the vacuum line for the fuel pump on my 650. I took the carbs off and thoroughly cleaned them again today. Got some jump out of two bowls, and some gummed gas from a few spots. Scrubbed with a brush, did the pilot circuit clean that i've seen pictures of (Crack the bowls, pilot jets out, blow air/cleaner through the pilot circuit blocking different ports). Put the carbs on, same issue. The only thing I haven't done is change the spark lead from this cylinder (I can't because the shop that put the coils on glued the lines in place. ..) could this be because of the vacuum line? Do I just have to live with it? Floats were quadruple checked. Keep in mind this is a bored 650 out to a 720. Pods, dyna jet stage 3 kit with needle on clip 4, 122 mains, 4 into 1 exhaust. Anybody...?

Have you tried moving the vacuum line to another carb and see if the problem follows it that way? Maybe the vacuum line has a slight air leak on the petcock end?

Later, Doug

I haven't tried that no. If I can I will. The other thing I was thinking is that maybe the choke passageway on that carb is clogged so it's staying stuck open a hair and causing it to run rich? Could this happen?

650mod wrote: Lucky...

Ok so i'm still haven't been able to get that one cylinder to burn clean on idle. This is the cylinder that runs the vacuum line for the fuel pump on my 650. I took the carbs off and thoroughly cleaned them again today. Got some jump out of two bowls, and some gummed gas from a few spots. Scrubbed with a brush, did the pilot circuit clean that i've seen pictures of (Crack the bowls, pilot jets out, blow air/cleaner through the pilot circuit blocking different ports). Put the carbs on, same issue. The only thing I haven't done is change the spark lead from this cylinder (I can't because the shop that put the coils on glued the lines in place. ..) could this be because of the vacuum line? Do I just have to live with it? Floats were quadruple checked. Keep in mind this is a bored 650 out to a 720. Pods, dyna jet stage 3 kit with needle on clip 4, 122 mains, 4 into 1 exhaust. Anybody...?

I am not aware of any KZ650 that uses a fuel pump.

If you meant to say there is a vacuum line from the problem carb to the petcock there is a common problem that sometimes causes that to run rich. KZ650 models that use vacuum operated petcocks have a vacuum line that runs from the petcock to a port on the #2 carb. That carb often ends up running rich or flooding because the diaphragm inside the petcock fails and permits fuel to run through the vacuum line into the carb. You can check this by removing the vacuum line from the carb and seeing if it has any gas in the line - it should not. Also, you can temporarily cap off that vacuum line and cap off the port on the #2 carb; put the petcock in the "PRI" position; and see if #2 still runs rich. If you find the petcock is the problem it can be rebuilt (sometime successfully / sometimes not) or replaced to solve the problem. Ed

You're a man of wise words Ed! This is what I meant- I wasn't sure if it was a vacuum operated fuel pump or not. But yes, that's the cylinder i'm referring to. OK i'll take a look at this soon. If this isn't the case, what would you suggest next?

Thanks Ed!

No luck with the vacuum line i'm going to inspect the choke assembly

So I took the whole choke assembly off, and puled the plungers. Inspected the tips for wear or gunk. And then checked the springs and seals. The spring on the carb that was giving me issues was weak, so I swapped the plunger unit out for a spare I have sitting around. Cleaned everything, blew it out with compressed air, and still no luck that cylinder...

So I swapped the spark line heads from cylinder one to cyl 2, gave that a shot. And no luck... Which is making me think that there could be an issue in the spark lead for #2 itself somewhere? Or I just need to rebuild the diaphragm for fun as well...

I'm really stumped with this one...