Hello,
Its a afo5e stock motor with a 90 jet. The other day it started to slow down while at half throttle and it just didnt have any top end after that. I noticed when it revs high there is a huge amount of air flowing up the gas line. What would cause that and how do I fix it.
air bubbles in fuel line
Moderator: Moderator
air bubbles in fuel line
88 SA 50- Af16e swap
87 Se 50 - 01 Af16E build
87 Se 50 - 01 Af16E build
Re: air bubbles in fuel line
"Huge amount of air" One big bubble or a lot of little ones?
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Re: air bubbles in fuel line
one Big bubble at first and then its streams of little bubbles until it goes to half full. it doesnt fill back up until I stop and crank it a couple of times.
88 SA 50- Af16e swap
87 Se 50 - 01 Af16E build
87 Se 50 - 01 Af16E build
Re: air bubbles in fuel line
You definitely have a a problem. It could be from the tank or the petcock causing this.
Try running without the gas cap down clear tight and see if that helps.
Try running without the gas cap down clear tight and see if that helps.
Bear 45/70
'83 Aero 80 X 3
'84 Aero 80 X 3
'85 Aero 80
'84 Aero 125 X 2
'84 Aero 125
'84 Aero 125 X 2
'85 Aero 50
'85 Spree
'83 Aero 80 X 3
'84 Aero 80 X 3
'85 Aero 80
'84 Aero 125 X 2
'84 Aero 125
'84 Aero 125 X 2
'85 Aero 50
'85 Spree
Re: air bubbles in fuel line
if your fuel line at some point goes up just a little before the carb, that will cause bubbles and a slow fuel flow
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90 honda dio sp 72cc
87 elite 50 s with 86cc watercooled mini stroke
87 elite 50 race bike mhr 72cc
91 yamaha tzr 250r
Re: air bubbles in fuel line
Okay I made sure the hose is perfect length and now its just a stream of little air bubbles. Suggestions for next thing to investigate.
88 SA 50- Af16e swap
87 Se 50 - 01 Af16E build
87 Se 50 - 01 Af16E build
Re: air bubbles in fuel line
so the hose had a section that was going in a up hill direction?TikiMan wrote:Okay I made sure the hose is perfect length and now its just a stream of little air bubbles. Suggestions for next thing to investigate.
Nothing like getting stroked!
Thanks to my sponsors
Nos Energy Drinks,themopedcompany.com,nwautoevents.com,Cycle Gear
90 honda dio sp 72cc
87 elite 50 s with 86cc watercooled mini stroke
87 elite 50 race bike mhr 72cc
91 yamaha tzr 250r
Thanks to my sponsors
Nos Energy Drinks,themopedcompany.com,nwautoevents.com,Cycle Gear
90 honda dio sp 72cc
87 elite 50 s with 86cc watercooled mini stroke
87 elite 50 race bike mhr 72cc
91 yamaha tzr 250r
Re: air bubbles in fuel line
From which direction are the bubbles coming from, the top or the bottom?TikiMan wrote:Okay I made sure the hose is perfect length and now its just a stream of little air bubbles. Suggestions for next thing to investigate.
Bear 45/70
'83 Aero 80 X 3
'84 Aero 80 X 3
'85 Aero 80
'84 Aero 125 X 2
'84 Aero 125
'84 Aero 125 X 2
'85 Aero 50
'85 Spree
'83 Aero 80 X 3
'84 Aero 80 X 3
'85 Aero 80
'84 Aero 125 X 2
'84 Aero 125
'84 Aero 125 X 2
'85 Aero 50
'85 Spree