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Old November 9th, 2020, 03:56 PM   #1
MarlboroDew
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Question Rebuilt carb and no start

Okay, so...

Bike would run for about 5 minutes and die.

I have rebuilt the carbs and got a new petcock, put new gas in and it will not start. My guess is that the new petcock(which is not OEM) is not creating big enough of a vacuum.

Any direction is greatly appreciated. I just want the bike to run again.

Also, any tips for getting rust out of the inside of the gas tank.
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Old November 9th, 2020, 04:10 PM   #2
Triple Jim
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Quote:
Originally Posted by MarlboroDew View Post
My guess is that the new petcock(which is not OEM) is not creating big enough of a vacuum.
Petcocks don't create vacuum. They're just a valve to control fuel flow from the tank to the carbs. You can rig up a temporary tank of some sort and run a line from it to the carbs to see if your problem is the petcock or the carbs.

Or if this is an aftermarket vacuum petcock you can just suck on its vacuum line with your mouth to test its flow. And if it's not a vacuum petcock, just open it and see if it flows fuel.

My guess is that something is wrong in the carbs, but that's just speculation.

Welcome to the board, Gabe!
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Old November 9th, 2020, 04:21 PM   #3
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Hi Gabe and welcome to Ninjette!

Hmmm, 5-minutes is an odd number. Let's do some testing to get some data:

1. Run bike with gas-cap off. Does it run for more than 5-minutes?

2. Disconnect fuel-hose from carb-inlet and aim into measuring cup. Run bike for 30-seconds and stop. How much petrol did you collect in measuring cup?
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Old November 9th, 2020, 04:24 PM   #4
MarlboroDew
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Originally Posted by DannoXYZ View Post
Hi Gabe and welcome to Ninjette!

Hmmm, 5-minutes is an odd number. Let's do some testing to get some data:

1. Run bike with gas-cap off. Does it run for more than 5-minutes?

2. Disconnect fuel-hose from carb-inlet and aim into measuring cup. Run bike for 30-seconds and stop. How much petrol did you collect in measuring cup?

Can't do either of these because as of now the bike doesn't run.
It ran for 5 mins before I rebuilt the carbs because that's what everyone i talked to told me to do.

I am going to test the vacuum line on the petcock tonight and let y'all know.

Thank you for responding.
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Old November 9th, 2020, 05:40 PM   #5
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Gabe, did you disturb the carb synch screw during your carb work?

Where are your pilot screws set? (# of turns out from seated)

Did you pull pilot jets? Any evidence of clogging? #38 pilot? Or some other #?
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Old November 9th, 2020, 08:18 PM   #6
DannoXYZ
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Quote:
Originally Posted by MarlboroDew View Post
Can't do either of these because as of now the bike doesn't run.
It ran for 5 mins before I rebuilt the carbs because that's what everyone i talked to told me to do.

I am going to test the vacuum line on the petcock tonight and let y'all know.

Thank you for responding.
Well, we can still test petcock's flow:

1. first, unscrew carb float-bowl drains. Does petrol drip out? Tighten back up.
If float-bowls are dry, we can assume petcock is not working and no petrol is making it into carbs.

2. As mentioned, artificially apply vacuum to petcock by sucking on vacuum-hose, or using a syringe or vacuum-pump. Then measure petcock flow into measuring cup for 30-seconds.
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Old November 9th, 2020, 09:32 PM   #7
MarlboroDew
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Originally Posted by ducatiman View Post
Gabe, did you disturb the carb synch screw during your carb work?

Where are your pilot screws set? (# of turns out from seated)

Did you pull pilot jets? Any evidence of clogging? #38 pilot? Or some other #?
I did not touch the synch screw and pilot screws are set 2.5 turns out. I took all the jets out cleaned it with carb cleaner and ran a guitar string through all of them to make sure there is no clogs.
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Old November 10th, 2020, 06:37 AM   #8
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i hate to be the one to tell you, but reality dictates. Internal carb issues frequently require more than simply cleaning the jets. Your issues seem to be a bit deeper inside.
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Old February 15th, 2021, 07:53 PM   #9
watyo
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Any updates on your bike issue?
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Old April 7th, 2021, 11:14 AM   #10
mieze245
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2.5 turns?

https://www.ninjette.org/forums/showthread.php?t=138536
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