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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Tricky Tricky! Vapor Lock? /cgi-bin/YaBB.pl?num=1517425199 Message started by Maine413 on 01/31/18 at 10:59:59 |
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Title: Tricky Tricky! Vapor Lock? Post by Maine413 on 01/31/18 at 10:59:59 First off, thank you to everyone who's posted something on this forum. I've pretty much checked it every single day of the last 6 months while I've been working on the bike. Sure, it's small but it's a ton of fun to ride. I've only ridden it a handful of times, but I'm already in love with it. Now to the issue at hand... She fires right up. Runs perfect and smooth up until 60mph, and then I start having what I think are vapor lock issues. It'll start to lose power and then it'll die completely. Not the most fun on the highway, but it's at least been predictable, so I'm able to pull over without any issues. Now when this 1st started to happen, I had just finished putting the bike back together, and I had no clue what it was. The bike had been siting for 10 years, so I thought perhaps I needed to do a more thorough cleaning of the carb. Did that, and I had the same issue. I ordered a jet kit Lancer(awesome guy), and fitted it with a 55/155. It ran even better than before, but still the vapor lock issue. I then turned to the gas cap. (I've already replaced the fuel line, and I already have the raptor petcock installed.) The cap was filthy on the inside. I soaked it for a few hours and cleaned it. This freed up movement of the little ball that is inside the cap. I thought that would do the trick. It did improve, but I'm still having the same issue. Now I can feel it try to fight before it stalls, that didn't happen before cleaning the cap. I did notice that the rubber gasket on the cap is cracked in a few places. One way I tested the theory is taking the cap of as soon as I stop. Sure enough, it fired up every time, as if nothing were wrong at all. I take off and accelerate hard up to 60mph, and it would happen again. If I'm cruising up to 45mph, I don't have any issues at all, except a sore face from smiling too hard. The bottom line question is, is it safe to assume that it is in fact the gas cap at this point? If so, is there anyone that a cap that they know is in good working condition and is will to expedite shipping to me? Info on bike mods: 1996 2,500 original miles! Custom cone intake tube, with K&N style cone. Will be replacing with an actual K&N soon. Custom exhaust with baffle insert. 55/155 jets in carb, and I believe it external adjuster screw is at about 1.5 turns out. I live in Atlanta, so according to the interwebs I'm about 800ft about sea level. Any advice is appreciated! I'm ready to take this thing out for some long rides! I'll post more pics and the like when she's completed. I just want to get this issue resolved before I focus on anything else. |
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Title: Re: Tricky Tricky! Vapor Lock? Post by Gary_in_NJ on 01/31/18 at 11:46:02 That sure does sound like the gas cap. Here's a final test; get the bike low (1/2 tank or less) on fuel, remove the cap, and then put it back without "clicking" it into place. Place some duct tape on it to secure it in place and then go for a ride. If it continues to run, you have a bad cap. |
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Title: Re: Tricky Tricky! Vapor Lock? Post by verslagen1 on 01/31/18 at 12:22:11 authentic yamaha raptor petcock? 5/16 fuel line? no add on filter? 1/4 fuel doesn't clear air in the line well. fuel filter with air in can vapor lock. |
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Title: Re: Tricky Tricky! Vapor Lock? Post by Maine413 on 01/31/18 at 12:48:48 I'm honestly not sure if it's an authentic raptor petcock or not. It came with the tank that I bought from someone on the forum. I can double check with them and find out. I'm also not sure of the the deminisions of the fuel line. I bought it from AutoZone. However, I've switched it out with the stock line and had the same issues with it. No filter on the line. |
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Title: Re: Tricky Tricky! Vapor Lock? Post by batman on 01/31/18 at 13:59:28 With cracks in the gas cap gasket ,and after restarting and running up to 60 and have the tank vapor lock that fast ,seems to me very doubtful ,(if you don't hear a whoosh of air enter the tank when you release the cap after it stalls the tank isn't vapor locked.) IF the petcock is a true Yamaha part then that shouldn't be the problem either. It may be that your float bowl level is set to low ,did you check it when reassembling the carb after cleaning? Did you check the condition of the float valve and seat and O-ring ,did you check/clean the filter screen above the float valve seat? |
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Title: Re: Tricky Tricky! Vapor Lock? Post by Maine413 on 01/31/18 at 14:11:57 5C5F4A535F500A063E0 wrote:
I should have mentioned that my experience with carbs is very limited. Prior to working on this bike, I haven't worked with carbs before. That being said, I don't have the proper tool to check float height. I also wasn't able to remove the pin that holds the float. That is the only area of the carb that I wasn't able to clean thoroughly. |
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Title: Re: Tricky Tricky! Vapor Lock? Post by batman on 01/31/18 at 14:22:46 You need to be careful with the pin ,it only slides out in one direction ,due to the carb body being soft metal you should try pushing it out, not driving it out! then you can unscrew the plate and remove the valve seat ,the filter screen will be just above it. You need only a ruler to set the float level. |
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Title: Re: Tricky Tricky! Vapor Lock? Post by Maine413 on 01/31/18 at 14:26:23 2023362F232C767A420 wrote:
I've tried a few different methods, but I haven't even able to get the pin to budge. I've tried needle nose pliers, soaking it overnight in carb cleaner, tapping 1 side with a nail and hammer, etc. Nothing had worked for me. |
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Title: Re: Tricky Tricky! Vapor Lock? Post by batman on 01/31/18 at 14:42:17 If you make sure there is no fuel in the carb, you could try heat (no not a torch!) in the form of a soldering iron ,placed on the pin briefly, or penetrating oil -(carb cleaner will not attack rust or corrosion as well) |
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Title: Re: Tricky Tricky! Vapor Lock? Post by antmanbee on 01/31/18 at 15:19:16 If you put a clear hose over the drain nipple on the bottom of the carb and curve the hose up and then open the nipple up you will be able to see the level of the gas in the float bowl. |
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Title: Re: Tricky Tricky! Vapor Lock? Post by batman on 01/31/18 at 15:55:26 Antmanbee, But that is a static reading, you'll need to start the bike in neutral and run at about 4000rpm(=to 60mph) to see if the fuel level drops due to a plugged screen. The bike pictured has no muffler and the jets are rather large, it may be going to wide open throttle is flooding the motor and making it die because the fuel mix is way to rich. |
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Title: Re: Tricky Tricky! Vapor Lock? Post by Maine413 on 01/31/18 at 15:57:51 I was hoping the cap would be the simple solution that I was looking for :-[ I'll see if I can get the pin out tonight. |
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Title: Re: Tricky Tricky! Vapor Lock? Post by batman on 01/31/18 at 16:12:22 Maine 413, Your new to the bike ,nothing to be embarrassed about! |
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Title: Re: Tricky Tricky! Vapor Lock? Post by Maine413 on 01/31/18 at 16:20:25 3F3C29303C3369655D0 wrote:
I'm not embarrassed. I just want to ride! Lol |
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Title: Re: Tricky Tricky! Vapor Lock? Post by Maine413 on 02/21/18 at 09:08:20 So I think I finally solved the issue! The screen was filthy. Haven't had any issues today. I'll take it out on the high way soon. Here's a before of the screen. |
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Title: Re: Tricky Tricky! Vapor Lock? Post by Maine413 on 02/21/18 at 09:11:34 5C5F4A535F500A063E0 wrote:
The screen was filthy, but I got it pretty clean. I tried running smaller jets also, and it ran smoother. I put the larger jets back in, and has more power, but not as smooth. Thanks again for the tips. |
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