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Old April 15th, 2020, 04:24 PM   #1
sg2001
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2008 Ninja 250 not getting gas

I recently bought a non running 2008 ninja 250r project. The carbs came disassembled, but I put them back together using pictures and diagrams from this forum. The bike only has 1000 miles on it. I bought it from a guy who planned on turning it into a race bike but he didn't have the time to work on it so I bought it, it just needs a few things here and there. The engine has compression and the spark plugs are firing just fine. However, when I take the plugs out after trying to start it they're bone dry, meaning no gas is getting to the combustion chamber. I have taken the carbs apart 5 times already, the jets are clean and there's no gunk whatsoever, and fuel is getting to the the float bowl just fine. I assume nothing is wrong with the intake valves because the motor still has compression and I can visibly see them open with the carbs off. There was some confusion on where the carb hoses went, but I have the big main fuel hose attached to the fuel petcock, the long vent hose in the middle is routed down to the rear shock, the hose bridging from the coasting enricher to the nipple on the RH carb, and the nipple on the LH carb is the vacuum line that goes directly to the petcock. (Is this correct?)

I'm not sure if there's something obvious that I'm missing, if there's something wrong with the way I have the carb setup, or something else, but fuel wil not get into either combustion chamber when I try to start it.

What could cause this?
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Old April 15th, 2020, 04:28 PM   #2
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Old April 15th, 2020, 04:58 PM   #3
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start attempts using full choke?
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Old April 15th, 2020, 05:24 PM   #4
sg2001
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Quote:
Originally Posted by ducatiman View Post
start attempts using full choke?
OK disregard the first part, I got it running but it dies when I give it throttle. I turned the idle up and it'll go up a little bit when I give it gas but again, it'll die. I also think it may be running lean because it seems to get really hot right away.

So, how do I make the fuel more rich, and what could I do about it dying when I give it gas? Could it just be that I need to run it more because it's been sitting for so long?
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Old April 15th, 2020, 06:26 PM   #5
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The idle mixture adjustment is next to the float bowl it might be covered with a cap.
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Old April 15th, 2020, 07:05 PM   #6
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Hi Sam and welcome to Ninjette!

Quote:
Originally Posted by sg2001 View Post
I got it running but it dies when I give it throttle. I turned the idle up and it'll go up a little bit when I give it gas but again, it'll die. I also think it may be running lean because it seems to get really hot right away.
This is classic symptoms, thousands have been stuck here. Your carbs aren't factory-fresh clean. I assume following wasn't done:

- soak in hypersonic cleaner (+5000ghz)
- using radioactive caustic solvents
- all fuel-passages before and after jets flossed with brushes and wire
- micro soda-blasting @ 10 000psi+
- float-level set and butterflies synced

Your symptoms are exactly same as many others who've come before you with partially-cleaned carbs. But not fully restored to brand-new factory-fresh condition. Do search on here for "ducatiman clean carbs" to find others that had this problem and how they resolved it. Also there's many photos of hidden secret fuel-passages that aren't obvious.

Also may need to replace all rubber parts: O-rings in fuel-distribution tube (did you separate carbs?). O-ring in pilot-jets. And float-bowl seals along with new float-valves.

Bike will run like brand-new scalded cat off showroom-floor when carbs are factory-fresh clean.
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Old April 15th, 2020, 07:21 PM   #7
sg2001
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Quote:
Originally Posted by DannoXYZ View Post
Hi Sam and welcome to Ninjette!

This is classic symptoms, thousands have been stuck here. Your carbs aren't factory-fresh clean. I assume following wasn't done:

- soak in hypersonic cleaner (+5000ghz)
- using radioactive caustic solvents
- all fuel-passages before and after jets flossed with brushes and wire
- micro soda-blasting @ 10 000psi+
- float-level set and butterflies synced

Your symptoms are exactly same as many others who've come before you with partially-cleaned carbs. But not fully restored to brand-new factory-fresh condition. Do search on here for "ducatiman clean carbs" to find others that had this problem and how they resolved it. Also there's many photos of hidden secret fuel-passages that aren't obvious.

Also may need to replace all rubber parts: O-rings in fuel-distribution tube (did you separate carbs?). O-ring in pilot-jets. And float-bowl seals along with new float-valves.

Bike will run like brand-new scalded cat off showroom-floor when carbs are factory-fresh clean.
Thanks for the feedback. I do not have a hyper sonic cleaner or a soda blaster, I'll probably invest in those later but for now ill separate the carbs and clean it the best I can
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