November 18th, 2020, 01:16 AM | #1 |
carb newbie
Name: Clark
Location: Dallas, Texas
Join Date: Nov 2020 Motorcycle(s): 2008 Ninja 250R Posts: 22
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Gas Cap Vent Problems?
Hey all, I got an 08 250R, first bike, and first time working with carbs! (Oh boy)
Anyways, before I even explain my problems with the carbs so far, I'll at least try and fix everything else. Currently, when I open the gas cap, there is a massive rush of air into the tank, so I assume the cap is not venting correctly. I confirmed that the drain hose/vent tube from the tank to the bottom of the frame is clear by blowing air through it. Therefore, I assume the cap itself isn't venting correctly. I found some threads talking about this but it was on the previous generation so I am unsure if the "fix" is the same, or hell, IDK if this is even a problem. I will say, it is a HUGE rush of air sometimes, so much that it atomizes the air and gas seems to spritz on me. I would assume this isn't right. If someone can help me out, that would be great! Thanks! |
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November 18th, 2020, 05:37 AM | #2 |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
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You certainly found a problem that needs to be corrected. I have a pregen 250 so I won't try to give you specifics, but you should be able to carefully disassemble the cap on a table, taking photos as you go if necessary, to remember how it came apart, and get it cleaned.
I've done all my own carb work all my life, but when my 250 carbs got to where I wasn't happy with their performance I sent them to Ducatiman here. He has all the parts and cleaning equipment to make them like they were when they were new. I had them back within a week of when I sent them, and I was not disappointed. Welcome to the board, Clark! |
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November 18th, 2020, 10:10 AM | #3 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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Greetings and Salutations Clark!!!
I've got photos somewhere, I'll upload with procedure later. Involves drilling out 3-holes in innards of cap. |
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November 18th, 2020, 06:42 PM | #4 |
ninjette.org certified postwhore
Name: Rick
Location: Alexandria, Louisiana
Join Date: Jan 2009 Motorcycle(s): 05 Blue Ninja 250 Posts: Too much.
MOTY - 2017, MOTM - Jan '19, Oct '16, May '14
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Hello and welcome!
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November 21st, 2020, 12:24 PM | #5 |
carb newbie
Name: Clark
Location: Dallas, Texas
Join Date: Nov 2020 Motorcycle(s): 2008 Ninja 250R Posts: 22
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November 21st, 2020, 12:25 PM | #6 |
carb newbie
Name: Clark
Location: Dallas, Texas
Join Date: Nov 2020 Motorcycle(s): 2008 Ninja 250R Posts: 22
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November 21st, 2020, 12:25 PM | #7 | |
carb newbie
Name: Clark
Location: Dallas, Texas
Join Date: Nov 2020 Motorcycle(s): 2008 Ninja 250R Posts: 22
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Quote:
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November 24th, 2020, 01:41 PM | #8 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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DIY - New-gen Gas Cap Vent Mod
Here's how to do gas cap mod for new-gen bikes. Take pictures along way and lay out parts numbered in order of disassembly for easier time. 1. remove cap from tank. Only need to undo 3 of 6 bolts at 1, 5 and 9 o'clock 2. undo screws to remove latch mechanism 3. Remove covers to dig even deeper. Will end up with pile of parts 4. drill 3/32" larger vent-hole here. Don't go too deep as there's rubber diaphragm below. Use tooth-pick to probe for depth and wrap some tape around drill-bit as gauge to prevent going too deep 5. drill out these holes to 3/32" 6. re-assemble, starting with putting 4x springs back in place 7. put middle cover back on. Make sure 4x springs underneath stays in place 8. another cover back on 9. flip over latch assembly over and attach tongue & spring 10. gently flip over latch assembly and attach to cap 11. reinstall cap on tank Some people have reported that this mod doesn't remove hissing tank-cap. In which case, you might as well drill all way through diaphragm in step #4. Note that doing so will allow petrol to pour out cap if bike is tipped over. So be ready to pick it up ASAP in that case, otherwise spilled petrol will cause damage to paint on tank and melt fairings. Last futzed with by DannoXYZ; November 25th, 2020 at 08:51 PM. |
1 out of 1 members found this post helpful. |
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