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1978 GS750 Fuel Line

  • Thread starter Thread starter afraziaaaa
  • Start date Start date
My paint is garbage anyway!

It's already been 24 hours since I emptied the clean. I was thinking of giving it a rinse this evening and letting it dry at least another 24.
 
The "rust blast" sauce is phosphoric acid, which is water soluble. No clue why they reference allowing the tank to dry after cleaning since this doesn't matter. What does matter though is that you fully derust your tank before sealing. Keep the rust blast in the tank and keep the surface WET until ALL the rust is GONE. Look inside the tank and use a mirror on a stick with a flashlight to look carefully (don't forget the top of the tank) before calling the derusting done. You can reuse the phosphoric acid again so I'd recycle it. Rinse well with water. Really well. And then after dumping out the water I recommend a couple bottles of isopropyl alcohol to help remove all the water.
 
Nessism said:
The "rust blast" sauce is phosphoric acid, which is water soluble. No clue why they reference allowing the tank to dry after cleaning since this doesn't matter. What does matter though is that you fully derust your tank before sealing. Keep the rust blast in the tank and keep the surface WET until ALL the rust is GONE. Look inside the tank and use a mirror on a stick with a flashlight to look carefully (don't forget the top of the tank) before calling the derusting done. You can reuse the phosphoric acid again so I'd recycle it. Rinse well with water. Really well. And then after dumping out the water I recommend a couple bottles of isopropyl alcohol to help remove all the water.
Click to expand...

Excellent points about being water soluble and using IPA to dry it out. Thanks for those tips. I think it's possible to finish the derust portion tonight then, and maybe do the sealing this weekend.
 
I did use the IPA to rinse but got some flash rust. I think flash rust is OK to coat over according to something I read on the KBS website. They also recommend to dry with a heat gun, but I think that is assuming a total restoration job including exterior painting.
 
One of my soldiers and I stripped an old liner and redid the tank with KBS. The heat gun worked great for drying it out but bubbled the paint. The flash rust should be okay if its only a few hours old. I wouldnt let it sit for over a week though.
 
aclaytonb said:
One of my soldiers and I stripped an old liner and redid the tank with KBS. The heat gun worked great for drying it out but bubbled the paint. The flash rust should be okay if its only a few hours old. I wouldnt let it sit for over a week though.
Click to expand...

Thanks. I will be able to get to the sealing tomorrow evening. If I don't like the way it looks at that point, I will use the recycled etchant again before coating.
 
afraziaaaa said:
Thanks. I will be able to get to the sealing tomorrow evening. If I don't like the way it looks at that point, I will use the recycled etchant again before coating.
Click to expand...

I sealed over the flash rust. Came out great. Took a long time to set up enough to stop rotating it and was tedious to drain excess sealer, but will work out nicely I think.

Hope to be riding it again within 10 days, this time reliably!
 
Just make sure to let it dry all the way before adding gas. Pretty sure that's what killed Darci's por-15 liner.
 
The KBS kit was the first thing i did to my bike when I got it over a year ago. Nice to look in there when filling up and see that hard shiny epoxy look.

I did have a very thin film of liner material that I couldnt avoid near the gas lid area and it flaked and went in the tank. Were I to do it over I would remove the thin liner at the mouth with a razor blade after it cured.

I pulled the tank when it was near empty and just rinsed it out but would have been better to catch it before hand. Also .. I used a straight up 80's style hairdryer not a heat gun. I kind of prefer more slow and steady.
 
I just like them because they are an Indiana company. Damn few of those here in corn country.
 
Boriqua said:
The KBS kit was the first thing i did to my bike when I got it over a year ago. Nice to look in there when filling up and see that hard shiny epoxy look.

I did have a very thin film of liner material that I couldnt avoid near the gas lid area and it flaked and went in the tank. Were I to do it over I would remove the thin liner at the mouth with a razor blade after it cured.

I pulled the tank when it was near empty and just rinsed it out but would have been better to catch it before hand. Also .. I used a straight up 80's style hairdryer not a heat gun. I kind of prefer more slow and steady.
Click to expand...

I got the same on the filler neck. Up to this point I have assumed that it will just stay, but I?ll take it off today. Thanks for the tip.

i did use my heat gun a bit to finalize the drying out prior to coating, but i did not hold it in there for an extended period. Let the tank air dry for two days, then used heat for about 15 minutes to get any residual water out which worked great.

i agree with you, the kbs lining looks very good. I have red kote on another tank and I like the look and the hardness of the kbs better.
 
Tank is installed and doing well. I am getting heinous gas mileage now (about 20mpg or so) and inconsistent idle which is high most of the time when the bike is warm. I have no intake leaks. I'm thinking petcock issue or ignition issue or both.
 
I dont know if your bike has washers or boots at the intakes but I resisted the boots like a mad man. I sprayed a can of starter fluid over many tech sessions and was sure I had no leaks. I replaced clamps and did weather seal and did just about everything I could do short of the boots.

The guys in the know here kept telling me replace the boots but I could squeeze the boots and there were no cracks so I resisted.

Finally at wits end .. I changed the boots .. done. It has been stellar and with a bone steady idle ever since.

My advice ... if you havent already changed what you have between your engine and carbs .. just do it and save yourself a ton of time and aggravation.

My only other thought is about your MPG .. I dont know how long the bike has been sitting but if it has been a while ... you may want to try and ride it out some more before looking to hard for culprits. Think of it like this ..I am old ... if I go for a bicycle ride for exercise the first 4 miles or so are torture. My lungs havent opened up, there is crap in em that works its way out, the blood takes a bit of time to fill up in the legs, Im light headed .... just not pretty. After about 4 miles I can pretty much ride damn near the rest of the day.

If your bike has been sitting and you just woke it up it just may need some time to cough up that lugie.
 
Boriqua said:
I dont know if your bike has washers or boots at the intakes but I resisted the boots like a mad man. I sprayed a can of starter fluid over many tech sessions and was sure I had no leaks. I replaced clamps and did weather seal and did just about everything I could do short of the boots.

The guys in the know here kept telling me replace the boots but I could squeeze the boots and there were no cracks so I resisted.

Finally at wits end .. I changed the boots .. done. It has been stellar and with a bone steady idle ever since.

My advice ... if you havent already changed what you have between your engine and carbs .. just do it and save yourself a ton of time and aggravation.

My only other thought is about your MPG .. I dont know how long the bike has been sitting but if it has been a while ... you may want to try and ride it out some more before looking to hard for culprits. Think of it like this ..I am old ... if I go for a bicycle ride for exercise the first 4 miles or so are torture. My lungs havent opened up, there is crap in em that works its way out, the blood takes a bit of time to fill up in the legs, Im light headed .... just not pretty. After about 4 miles I can pretty much ride damn near the rest of the day.

If your bike has been sitting and you just woke it up it just may need some time to cough up that lugie.
Click to expand...


Fair enough. I bought the bike with pods. Over the weekend I put on the stock air box. No change to the idle.
 
You changed from pods to the airbox? Did I miss a jet change in the carbs?
 
aclaytonb said:
You changed from pods to the airbox? Did I miss a jet change in the carbs?
Click to expand...

You didn't. PO put the pods on, but did nothing to the carbs. I haven't pulled the carbs to look, but this is what he told me.

With the pods, the plugs were wet after a ride. Now that I have the stock airbox on, the plugs are no longer wet when I pull them after running and they are starting to develop that tan color.
 
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