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  #7111  
Old 04-28-2014, 06:02 AM
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Default Re: what did you do to your motorized bicycle today?

X I think A/W and Cruise are talking about fuel coming out of the vent in the cap.
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  #7112  
Old 04-28-2014, 11:18 AM
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Default Re: what did you do to your motorized bicycle today?

Quote:
Originally Posted by Allen_Wrench View Post
Got some riding done. Was hoping for a bit more than that. I motored down to the local O'Reilly's Auto Parts store to do a bit of brainstorming (and browsing, can't lie). I have a place on my tank, just back of the gas cap, where a little bit of fuel always seems to get on the paint and dissolves it off. So I was looking a fuel-proof washer (wouldn't really solve anything because it seems to be only a drop or two coming out the vent hole) and/or maybe something to cover the paint with.
The employees there had no workable ideas that they thought would last even short-term. But they were perfectly willing to ogle the bike. One said he'd seen me going by now and then, and had been hoping for a closer look. They loved the thing. It sure beat the last time when I had a guy point and say "What's that?" as if I'd ridden up on the back of a Howler Monkey or something.
Dude! I got a solution for you. Its called VHT Engine Enamel. Comes in a rattle can. I got mine from Auto Zone, it's chemically resistant (gasoline won't wash it off). Only difficulty is it has to be baked on to be truly effective, but don't worry, this is how you do it.

1. Purchase a can of VHT in the color you desire.
2. Remove tank from bike. Drain all fuel. Let it sit open overnight in an outdoor location(but covered so rain won't get in it) to vent fuel vapors.
3. Using a vacuum cleaner with a hose attachment, insert the hose in the fill hole. Suction or blow, doesn't matter, but blow is better. Power up vacuum & let it run for at least 30 minutes. This should evacuate any remaining gas fumes.
4. For best results, sand the tank to provide the best surface for the paint to stick. When finished, wipe it down with a rag dipped in rubbing alcohol to remove any paint dust, grease or fingerprints.
5. Paint your tank, 2 coats should be good enough. Light sanding between coats with 600 grit is a great idea but not always required.
6. This is THE MOST IMPORTANT PART: Bake the tank in an oven at 200 for one hour. This is why you MUST make sure there is NO gas fumes remaining in the tank, or your oven may catch fire or even explode. If the paint is not baked on, it won't cure right & gasoline will eat through the paint. But once it is cured, you could soak it overnight in a tub of gasoline & the paint won't disolve or come off.

I painted my Skyhawk GT2A frame this way but because it was too big to fit into my kitchen oven, I ended up taking it to an auto body shop & had them bake it in one of their booths. I had to wait three days to get it back, as they waited for a whole car to bake with it, they were unwilling to crank it up just for a bike frame. Only cost me $20.00, but it was worth it.

Do not use clearcoat poly urathane, while it will lock in the color, it will also disolve under gas & mar the finish.
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  #7113  
Old 04-28-2014, 11:29 AM
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Default Re: what did you do to your motorized bicycle today?

Quote:
Originally Posted by SuperDave View Post
Dude! I got a solution for you. Its called VHT Engine Enamel. Comes in a rattle can. I got mine from Auto Zone, it's chemically resistant (gasoline won't wash it off). Only difficulty is it has to be baked on to be truly effective, but don't worry, this is how you do it.

1. Purchase a can of VHT in the color you desire.
2. Remove tank from bike. Drain all fuel. Let it sit open overnight in an outdoor location(but covered so rain won't get in it) to vent fuel vapors.
3. Using a vacuum cleaner with a hose attachment, insert the hose in the fill hole. Suction or blow, doesn't matter, but blow is better. Power up vacuum & let it run for at least 30 minutes. This should evacuate any remaining gas fumes.
4. For best results, sand the tank to provide the best surface for the paint to stick. When finished, wipe it down with a rag dipped in rubbing alcohol to remove any paint dust, grease or fingerprints.
5. Paint your tank, 2 coats should be good enough. Light sanding between coats with 600 grit is a great idea but not always required.
6. This is THE MOST IMPORTANT PART: Bake the tank in an oven at 200 for one hour. This is why you MUST make sure there is NO gas fumes remaining in the tank, or your oven may catch fire or even explode. If the paint is not baked on, it won't cure right & gasoline will eat through the paint. But once it is cured, you could soak it overnight in a tub of gasoline & the paint won't disolve or come off.

I painted my Skyhawk GT2A frame this way but because it was too big to fit into my kitchen oven, I ended up taking it to an auto body shop & had them bake it in one of their booths. I had to wait three days to get it back, as they waited for a whole car to bake with it, they were unwilling to crank it up just for a bike frame. Only cost me $20.00, but it was worth it.

Do not use clearcoat poly urathane, while it will lock in the color, it will also disolve under gas & mar the finish.
Autozone also sells rattle can lacquer paint that I have used on engine parts and such and it has never been effected by gas and it dries very fast, probably not as good of or tough of a finish as the VHT paint which I also use but so far the lacquer paint has always held up good also.

Map
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  #7114  
Old 04-28-2014, 11:46 AM
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turnofftheradio turnofftheradio is offline
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Default Re: what did you do to your motorized bicycle today?

I've used the bbq successfully to bake valve covers before. If you can't get use of an oven. Put some foil down. I 2nd that you have to bake the hi-temp stuff for it to work correctly.

and, I successfully soldered my gas tank studs this weekend without killing myself. I'm happy.
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  #7115  
Old 04-28-2014, 07:51 PM
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Default Re: what did you do to your motorized bicycle today?

Quote:
Originally Posted by xseler View Post
Why don't you just use a funnel when you add fuel?
But, I do. I even wrap a rag around the bottom when I fill up. I had the same issue when I had my old China Girl tank. I'm sure it's just a drop or two out of the vent hold every once in a while. I probably need to come up with something to cover it with.
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  #7116  
Old 04-28-2014, 07:57 PM
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Default Re: what did you do to your motorized bicycle today?

Quote:
Originally Posted by SuperDave View Post
Dude! I got a solution for you. Its called VHT Engine Enamel. Comes in a rattle can. I got mine from Auto Zone, it's chemically resistant (gasoline won't wash it off). Only difficulty is it has to be baked on to be truly effective, but don't worry, this is how you do it.

1. Purchase a can of VHT in the color you desire.
2. Remove tank from bike. Drain all fuel. Let it sit open overnight in an outdoor location(but covered so rain won't get in it) to vent fuel vapors.
3. Using a vacuum cleaner with a hose attachment, insert the hose in the fill hole. Suction or blow, doesn't matter, but blow is better. Power up vacuum & let it run for at least 30 minutes. This should evacuate any remaining gas fumes.
4. For best results, sand the tank to provide the best surface for the paint to stick. When finished, wipe it down with a rag dipped in rubbing alcohol to remove any paint dust, grease or fingerprints.
5. Paint your tank, 2 coats should be good enough. Light sanding between coats with 600 grit is a great idea but not always required.
6. This is THE MOST IMPORTANT PART: Bake the tank in an oven at 200 for one hour. This is why you MUST make sure there is NO gas fumes remaining in the tank, or your oven may catch fire or even explode. If the paint is not baked on, it won't cure right & gasoline will eat through the paint. But once it is cured, you could soak it overnight in a tub of gasoline & the paint won't disolve or come off.

I painted my Skyhawk GT2A frame this way but because it was too big to fit into my kitchen oven, I ended up taking it to an auto body shop & had them bake it in one of their booths. I had to wait three days to get it back, as they waited for a whole car to bake with it, they were unwilling to crank it up just for a bike frame. Only cost me $20.00, but it was worth it.

Do not use clearcoat poly urathane, while it will lock in the color, it will also disolve under gas & mar the finish.
Being that it's just a quarter-sized bare patch, if I used this kind of enamel do you think I could cure it with a heat gun? Yes, I would drain and air-out the tank and line.
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  #7117  
Old 04-28-2014, 08:01 PM
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Default Re: what did you do to your motorized bicycle today?

Quote:
Originally Posted by Greg58 View Post
X I think A/W and Cruise are talking about fuel coming out of the vent in the cap.
Yup. And I thought of a test: next time I ride I'm going to wrap duct tape around JUST the rim of the gas cap. Putter around a bit. Then see if there is a thin coat of fuel up on top of the cap, or down by the base of the neck. Once I'm positive where it's coming from, I can plan better.
But if I had to play to win, I'd place my bet on the vent hole. The gas cap has a fuel-safe washer in it.
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Last edited by Allen_Wrench; 04-28-2014 at 08:03 PM.
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  #7118  
Old 04-28-2014, 09:35 PM
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Default Re: what did you do to your motorized bicycle today?

After finding I'm running quite rich, I moved my circlip to the top notch (from second-top). NT carb by the way.
Straight away my fuel use has gone from about 37 to 51 km/litre. I'll see how the plug behaves to make sure I don't lean it out, but that's a good result so far.
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  #7119  
Old 04-28-2014, 10:05 PM
crassius crassius is offline
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Default Re: what did you do to your motorized bicycle today?

as I recall, we used to have problems with the small vent hole in the cap that was formed by just a slight bend in the inner part - no vent problems these last few years with new caps that have a drilled hole in the inner part, but I suspect that sloshing is causing gas to come out this drilled hole past the rubber seal - maybe a small felt ring there would help, but might cause the venting problem to come back
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  #7120  
Old 04-29-2014, 12:45 AM
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Default Re: what did you do to your motorized bicycle today?

It was a beautiful day here in Vancouver, so I took the cruiser out for a ride this afternoon. Both a happy and sad one; it was a great ride and she ran beautifully but it's my last ride on her. A farewell cruise, if you will; I sold her this morning.

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