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CB750 / Re: Tail cowl repair
« Last post by Bryanj on Today at 02:40:52 AM »
Also put some glass mat into the araldite to add strength if you use it
CB750 / Re: Nice bike just reminded seller its not a K1 !
« Last post by JamesH on February 25, 2020, 11:01:12 PM »
Looks like the seller pulled the auction and sold outside of eBay. I wonder what £ he achieved?
Misc / Open / Re: Thoughts on preventing newly de-rusted tank from corrosion.
« Last post by AshimotoK0 on February 25, 2020, 10:38:46 PM »
Yes I was thinking 2-stroke oil myself.

Will try the Evaporust stuff ... My Bomber tank is brimmed with Bilt-Hamber DeoX-C at the moment . Anyone got experience with that vs Evaporust ? We use Deox-C at work so I cadged some of that.

Lot of theories online is that DeOx-C is basically citric acid crystals and wetting agent ... the  fact that it is fit for human consumption kind of goes along with that.
Misc / Open / Re: Thoughts on preventing newly de-rusted tank from corrosion.
« Last post by Rob62 on February 25, 2020, 09:17:05 PM »
A bit of 2 stroke premix sloshed about will do the job.... rinse out before use and shouldn’t cause any smoke. Just out of interest, i recently acquired a rd350ypvs which had a bit of rust inside the tank.... i have previously used electrolyte and a battery charger to de-rust tanks but its a bit of a faff although it works well. This time i decided to try some of that evaporust stuff that sounds too good to be true.. its £30 for 5 litres but can be reused..just pour it in and wait...its not acidic or caustic so doesn’t attack paint plastic or aluminium or the steel itself (acid does). All it does is break the chemical bond between iron and oxygen thus destroying the rust, it isn’t strong enough to break the bond between iron and carbon so doesn’t damage the steel either.... but best of all it actually works brilliantly! You can also derust any other ferrous object, old nuts and bolts, tools, brackets...anything. Just drop them into a container of the stuff for a few hours... then pour back into the bottle to be reused again... magic.
CB750 / Re: Tail cowl repair
« Last post by Redders33 on February 25, 2020, 09:12:57 PM »
Cheers Rob I will give that a go 👍
CB750 / Re: Tail cowl repair
« Last post by Rob62 on February 25, 2020, 08:59:48 PM »
I’ve been doing a bit of plastic welding recently. I always used to use araldite in the past but it always fails eventually plus it looks a mess. All you need is a dremel (ideally) to scrape away any paint or previous repair material, a soldering iron and an old (or new) paint tray... avoid letting the solder iron get too hot, as long as it melts the plastic its hot enough, if it starts to smoke its getting too hot so keep turning it on and off to maintain the optimum temperature. Just press the iron into the crack and move down the cracked area using a prodding motion to fuse the area. If there is a gap or hole to fill just cut some filler strips from the black abs paint tray (available from your diy store for about 99p) and melt them into the repair. The repair will be very strong as you will have fused (welded) the repair. Then just sand down the area to finish the job.
CB750 / Seat
« Last post by Redders33 on February 25, 2020, 08:26:57 PM »
Bol d’or seat for f1? I’d like something similar that fits on the original seat pan does such a thing exist?
CB750 / Tail cowl repair
« Last post by Redders33 on February 25, 2020, 08:24:25 PM »
Tail cowl repair, is araldite the best stuff still for cracked and broken plastics? Cheers Nick
CB350/400 / Re: Mystery bit
« Last post by AndyD on February 25, 2020, 07:35:59 PM »
Thanks all,
I think it's probably something erroneous that just got dropped in the engine box but just wanted to check before closing up the crankcases.
Ka-ja - agree it looks like some kind of cap / plug but I couldn't see anywhere that it could have come from either.
Dave - the prizewinner can keep the 'whatever it is' and any other foreign bits and pieces left behind after the engine is finished.
Julie - I'll follow your lead and not stick it anywhere near the engine either.

The Black Bomber Board / Re: 71 CB450K4 float levels
« Last post by MrDavo on February 25, 2020, 07:24:49 PM »
I used the card tool, and set the level using the card tool against the carb body. I took the carbs off and held them vertically, a pain but otherwise it just wasn’t working for me when I tried to do it with the carbs in situ.

There seemed to be a fine line between too much fuel and not enough when I was trying to do it by trial and error, using the tool properly made a huge difference as it cured similar problems to yours. Tickover is now reliable, previously it had been all over the place.
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