Put in new jets...bike won't start =(

Hello everyone, I'm new to this and I'm learning as I go
I have a 1982 kz750 gpz and I just put on Pod filters knowing that I most likely have to re-jet my carbs.
I only re-jeted my main jets and my pilot jets to a larger size to let more fuel In.
The bike was starting just fine before I re-jeted now It wont start for more than 3 seconds.
Any suggestions to what could be happening?

The easiest solution is to put the air filter box and stock jetting back in and be happy. If you insist on pod filters, be ready to spend a lot of quality time with your carbs. Getting them dialed in can be a long and frustrating process. That is why there are dozens of threads on that verytopic. You should type pod filters in the search box and spend some time reading.

In the mean time, running for only three seconds may indicate that there is very little fuel in the carbs. Could be a clog, a kinked fuel line or even improperly set fuel level. Could be a fierce air leak or two. Could be really off jetting.

Did the bike run properly before the changes?

Yes it was running just fine before these changes

Could be a lot of things. Did you keep the floats/needle valves with each carb so they would not get mixed up?

What do the plugs look like?
Steve

JonGPZ750 wrote: Hello everyone, I'm new to this and I'm learning as I go
I have a 1982 kz750 gpz and I just put on Pod filters knowing that I most likely have to re-jet my carbs.
I only re-jeted my main jets and my pilot jets to a larger size to let more fuel In.
The bike was starting just fine before I re-jeted now It wont start for more than 3 seconds.
Any suggestions to what could be happening?

I'm shocked, shocked that anyone would have problems with their bike after installing pods; especially when the bike has CV carbs! :lol:

Put the airbox and stock filter back on along with stock jetting and enjoy riding the bike instead of spending your life trying to find the magic jetting formula. Ed

Internet search --- CV carbs explained. Youtube --- CV Carb animation
Because of the way they operate, CV carburetors are sensitive to changes in the air intake.
When using individual filters, someone here on KZR suggested using extenders between each carb & filter. I think the reason is that the extenders may stabilize the airflow into the carbs.

Stock airbox & jets. The bike may have been jetted lean from the factory, so if you keep the stock airbox, you might be able to increase the main jets a size or two. ???

People will put on headers and pods at the same time. Because headers are predictable and stay the same unless the baffel is F'd with and a lot of times it is, it's best to tune to the exhaust first. Then move on to the "Gasp" pods. I'd have guys bring in a perfictly good bike chopped up and parts missing wonderng why it won't run. I'd ask if he still had the parts and if he said no, I'd politely tell him to go somewhere else. It's crazy what some people will do to a bike to "customize" it.
SOME people shouldn't have tools. :sick:
Steve

Rule of thumb starting point for pods, 4-1 exhaust, head porting etc...

Also an excellent write u[p on CV carbs rebuilds....
kzrider.com/filebase/search/viewdownload...keihin-cvk40-via-omr

Thanks OMR, this will help me a ton, seeing as I put 4-1 and pods on my bike at the same time. I'm willing to spend the time to tune it, just had no idea what direction to go.

I would go back to the known good stock jets, and go from there. It should start and idle with nothing but some mixture screw adjustments.

You can't really just guess unless you have some experience jetting that particular bike, carb combination.

What were your old jet numbers and what are your new ones? Both pilot and mains.

The problem is most likely either the pilot jets being too big, or some other issue related to removing and reinstalling the carbs that has nothing to do with the jetting.