SOHC.co.uk Forums > CB750

rust inside tank

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the-chauffeur:

There was a good article in last month's Classic Bike about treating the inside of a tank.

Can't remember all the instructions off-hand, but something about cleaning the inside with a handful of gravel and a cement mixer - and electrolysis using a cold chisel and a battery charger to sort out any rust.

JonnyB:
I used flowliner on my F1 tank and it was quite bad with a leak in the side, Flowliner is an epoxy kit that coats the inside of the tank and traps any loose crap and fills hole when it hardens.

One tip, you will need to block the fuel outlet, don't  do what i did and just blank it off or you will be drilling out the hole.

But on the whole a good product.

totty:
I've used Petseal on a tank with a leaky seam, it was fine for a couple of months then I used BP Ultimate and it reacted. (also rotted the seal on the petrol tap on both that bike and my minimoto.)

I've hared of people putting old nuts and bolts in the tank, wrapping it in towels and putting it in the tumble dryer.

AshimotoK0:
Hey Jock - take a magnet to your filler flap- if it is non-magnetic then on no account bin it because these are really rare K0 items and cost a fortune (LIKE 180 Euros !!! from Yamiya who call them 'Antimon'). Mine had one on and I have had it rechromed but its not perfect. Evidently they  pitted very quickly and replaced by the steel one.



http://www.yamiya750e.com/index.php?main_page=product_info&cPath=32_80&products_id=654

This tank has appeared on Ebay BTW

http://cgi.ebay.co.uk/HONDA-CB750-SOHC-Fuel-Tank-1973_W0QQitemZ150421122335QQcmdZViewItemQQptZUK_Motorcycle_Parts?hash=item2305cc2d1f

bobthebuilder:
Honda KO Tank.
Hi Guys thanks for all the info on tank rust much appreciated.

Got a K2 last year from EBay which turned out to have K7 engine. Along with K2 came F2 in basket case condition and 2 boxes spare parts, and 2 petrol tanks sprayed black [very badly ]. Put them at back of garage and forgot about them till yesterday.
Went and dug them out and found one was originally pearl blue and other gold, both have wrinkles on spine at bottom but only visible if turned upside down, Gold tank is immaculate inside so appear to be lucky them.

Ash.  KO engine.
My nephew has a car repair garage in Doune Stirling.

They also customise Harleys ect. turns out mechanic has had SOHC. 750 from K1-K7, sold one last year to a guy in Malta. Engine is soaking in releasol at present time will keep you up to speed when he starts to dismantle same

Cheers Jock.

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