Hi, Have the original fibreglass tank on my 69. I lined it with POR15 tank sealer and thought I was home free. Lining now bubbling and lifting which is very disappointing as I have always been a big fan of POR15 products and thought I had prepped the tank well.
Anyway. I have ordered a new steel tank. Problem: The carb slides were sticking badly (virtually seized) and have now discovered the carbs are covered internally with a sticky gum that extends inside the the head inlet ports. Carbs and ports now cleaned. Kicked myself for thinking I could get away without swapping the tank on day one. Didn't realise that the lining was mixing with the petrol and causing major issues- I had paper filters on both taps which this stuff went straight through.
Question: Should I pull the head to check and clean the valve seats and faces and chamber/piston or should this goo clear itself.
Thx
Eddie
Valve stem and guides…
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Tank Sealing (Dross Alert)
Before ethanol was added to petrol; I don't recall such issues.
The Petseal in my slimline tank had dissolved over time (This was 2006/07) I only found out when the tickler became stuck, then I saw the mess in the tank.
What worked for me: I emptied the tank and removed soft sealant as best I could. Fortunately there were no holes in the tank. I also bought a new Amal 626 26 mm carb.
With the tank inside dry , what was left of the Petseal became hard and broke up easily, a good shake required.to get it out and fuel filter fitted.
I then put E0 petrol in the tank and all has been well since. The engine continued to run very well and been left since. (As John suggests: by all means take the head off for piece of mind)
Why we need to use scarce wheat to make this awful stuff I can only put down to politics.
BTW, it appears that additives only slow down the destructive process. Not the cure. But if you insist on using E fuel then run the carb / carbs dry if parking up for a while.
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Hi Eddie. I had the same…
Hi Eddie. I had the same problem with a Triumph tank (steel). As well as the carb slide and jets being jammed up with sealant goo, the valve guides had a layer of sticky gum in them which caused the valves to operate poorly. I stripped the head down completely and washed everything in cellulose thinners - problem solved. Good luck with sorting it.
Regards
Tony
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POR 15
Hi Mike. I reckon you are right. I assumed it was ok with fibre glass as the standard POR15 works fine with it. I coated a fibre glass shower tray with grey POR15 about 15 years ago and its perfect.
Just looked up the instructions. Oh well. The tank was on borrowed time anyway.
Eddie
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Valve stem and guides especially inlet need cleaning so it's a head off job anyway. Acetone should remove the residue.