February 4th, 2018, 10:15 AM | #1 |
Motorcyclist
Name: Frank
Location: Phoenix Arizona
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2005 kawi ninja 250r vacuum not sucking fuel from petcock
Ok, so here's what's been done. We've had to replace a piston, as we all know, rockers, cams, etc all had to be removed for this. Everything was put together again after the new piston and rings were installed.
The issue is this, my carbs are not pulling fuel through the vacuum supply line. It seems to be positive vacuum instead of negative vacuum. Does anyone know or have any ideas? My brain is racked, I've checked about everything I could, except the carbs, which is my next task. The bike was running completely fine up until #2 piston had a dime sized hole directly in the center. Im hoping it's just something that I overlooked due to being tired.
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February 4th, 2018, 11:19 AM | #2 |
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Hose reversed at petcock?
Or hoses at carbs? Measure vacuum coming from carbs, needs at least 10 in.Hg. Last futzed with by DannoXYZ; February 4th, 2018 at 02:28 PM. |
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February 4th, 2018, 11:24 AM | #3 |
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Name: Frank
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I'll do that as soon as I find a place that has a vacuum gauge. Aside from that, it's blowing air(it shouldn't be blowing) rather than sucking air, keeping my petcock vac diaphragm shut. Hoses are in the same positioning as when the bike was running fine before the piston fragged.
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February 4th, 2018, 11:36 AM | #4 |
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Check your valve-clearances and cam-timing if it's puffing air instead of sucking.
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February 4th, 2018, 11:41 AM | #5 | |
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Name: Frank
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Quote:
Thank you for your suggestions.
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At one point while checking sparks on the plugs it decided that my hand was a better earth than the frame. |
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February 4th, 2018, 04:50 PM | #6 |
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That is odd.
Re-check the cam timing to make sure the valves are opening at the proper time. Make sure you have the correct hose from the carb connected to the petcock - https://faq.ninja250.org/wiki/File:Annotated_1.jpg When you said - " my carbs are not pulling fuel through the vacuum supply line ... " - what do you mean? There shouldn't be fuel in that line - just vacuum to open the petcock. |
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February 4th, 2018, 05:28 PM | #7 |
Motorcyclist
Name: Frank
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we've checked The timing, etc. Should be spot on. Yet the carbs vacuum for the fuel supply is still blowing air instead of sucking. Something isn't right..
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February 5th, 2018, 06:04 AM | #8 |
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intake valves bent, pieces of piston stuck under intake valve? Is it running now or are you just cranking it?
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February 5th, 2018, 06:06 AM | #9 | |
Motorcyclist
Name: Frank
Location: Phoenix Arizona
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Quote:
Stay safe!
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July 4th, 2018, 08:48 PM | #10 | |
Motorcyclist
Name: Frank
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Quote:
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At one point while checking sparks on the plugs it decided that my hand was a better earth than the frame. |
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July 4th, 2018, 09:22 PM | #11 |
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How did you determine it was 180-degrees off?
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July 5th, 2018, 12:07 AM | #12 |
Motorcyclist
Name: Frank
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There was positive vacuum instead of negative vacuum. IF memory serves, positive vacuum pushes, while negative pulls(sucks) which indicated there was something very wrong with the timing. After checking the timing after noticing this the markings on the cams werent lining up correctly. I figure when i put tension on the timing chain i may have rotated the cams by mistake.
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July 5th, 2018, 12:25 AM | #13 |
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when you rotate cams to get your phasing make sure you keep your thumb pressed up against cam chain guide via cam chain tensioner housing. this will keep your chain chain from jumping teeth while setting your time
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July 5th, 2018, 12:29 AM | #14 |
Motorcyclist
Name: Frank
Location: Phoenix Arizona
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Thank you for that advice, maverick. I'll keep note of that for the next go around. The timing was corrected 6 months ago and she's ran fine since
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July 5th, 2018, 06:28 AM | #15 |
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Ah, so the marks were off by 180? I was wondering if it's possible to be off but have the marks look ok.
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