Vapor Lock - (Carb Upgrade & Emissions Removal)

Doubledown · 08-09-2022, 02:18 PM

Hoping to get some help with a topic I have only be able to find mentions of, not solutions.
I believe I am having a vapor lock issue. Before getting insurance I have just been taking the bike around the property and had it die and wouldn't start. Brought it back to the house checked spark, petcock etc. all seemed fine but I couldn't remember if I turned the petcock on when I started riding or if I forgot to turn it off the day before and flooded it. Turned off the petcock, opened the carb drain to get no more than a mist of fuel. Popped the tank and viola.
I just took it out to put some more break in miles on it and made it a mile and it died. This time I first popped the tank and it fired right back up.

So, in looking around I found mention of vapor lock and a roll over valve issue but no resolution as to where that is (written or pictures), do I need to remove it or replace it or.... etc. So I am hoping someone can direct me if this is the likely is, or what else it may be, and in either case how to get to and fix the issue.

I will also mention I just received my knock off vm22 carb kit I was planning to install after break in and after I get a new exhaust but am wondering if replacing all the emissions and carb include this check valve (or whatever else may be causing the vapor lock?
In either case here I interested if there is a post, perhaps sticky I am not seeing, for this emissions removal and what I need as a fuel petcock with this carb as it looks like the factory setup is the petcock is on the factory carb.
Thanks in advance.

**JerryHawk250** · 08-09-2022, 02:34 PM

Your tank vent is stopped up and letting air into the tank. Trace that down and unblock it.

08-09-2022, 02:18 PM	#1
Doubledown Join Date: Jun 2022 Posts: 26	Vapor Lock - (Carb Upgrade & Emissions Removal) Hoping to get some help with a topic I have only be able to find mentions of, not solutions. I believe I am having a vapor lock issue. Before getting insurance I have just been taking the bike around the property and had it die and wouldn't start. Brought it back to the house checked spark, petcock etc. all seemed fine but I couldn't remember if I turned the petcock on when I started riding or if I forgot to turn it off the day before and flooded it. Turned off the petcock, opened the carb drain to get no more than a mist of fuel. Popped the tank and viola. I just took it out to put some more break in miles on it and made it a mile and it died. This time I first popped the tank and it fired right back up. So, in looking around I found mention of vapor lock and a roll over valve issue but no resolution as to where that is (written or pictures), do I need to remove it or replace it or.... etc. So I am hoping someone can direct me if this is the likely is, or what else it may be, and in either case how to get to and fix the issue. I will also mention I just received my knock off vm22 carb kit I was planning to install after break in and after I get a new exhaust but am wondering if replacing all the emissions and carb include this check valve (or whatever else may be causing the vapor lock? In either case here I interested if there is a post, perhaps sticky I am not seeing, for this emissions removal and what I need as a fuel petcock with this carb as it looks like the factory setup is the petcock is on the factory carb. Thanks in advance.
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08-09-2022, 02:34 PM	#2
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,561	Your tank vent is stopped up and letting air into the tank. Trace that down and unblock it. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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