SOHC.co.uk Forums > CB750
Overtight Keyster Airscrews!
Sesman:
Feel your pain. I’m currently dealing with a very, very stubborn float bowl drain screw that shows no signs of yielding despite the use of heat, penetrating fluid and a custom screwdriver fashioned to fit the slot full depth and width. There has to be a way?
K2-K6:
That's a relief Andrew, and phew ;D they all came out.
Thinking logically through it from running the other day it may be worth getting Mark to double check the idle circuit paths on number 1 carb as it was that cylinder running intermittently, it seemed to pick it up as throttle opening increased, and could be worth close inspection.
The other 3 seemed to be running fine and with the ability to set idle mixture I'm confident that there wouldn't be a barrier to clean running.
I think it's very close to being recommisioned effectively and shouldn't need much, just that ability to fine trim it as we couldn't last time.
Nigel.
Laverdaroo:
--- Quote from: Sesman on October 08, 2021, 10:18:39 AM ---Feel your pain. I’m currently dealing with a very, very stubborn float bowl drain screw that shows no signs of yielding despite the use of heat, penetrating fluid and a custom screwdriver fashioned to fit the slot full depth and width. There has to be a way?
--- End quote ---
Put your screwdriver on the screw apply pressure but don't gorilla it or it will just distort and knacker. With a small hammer or heavy 'ish' screwdriver, ( I have a 4oz machinists hammer). whilst providing said pressure just tap the end of the driver repeatedly, (not hard and ) and try to keep tapping for a couple of minutes. It'll come, if it doesn't just repeat.
Sometimes they give up easily, sometimes it may take a couple of goes but it worked a treat for me on pretty much every welded shut screw and bolt on mine.
Im not saying beat the granny out of it but a constant percussive force no matter how weak will dislodge it in the end. 'Penetrating oil a go go' I hasten to add.............
Andrew-S:
Yes, a big phew Nigel, I'm very pleased they came out.
Thanks for the advice, I'll chat to Mark.
Cheers,
Andrew
Andrew-S:
My K1 carbs are now all sorted, Mark (MK Classics) not only managed to extract the snapped pilot jet see: http://www.sohc.co.uk/index.php/topic,25765.0.html but also the chewed Keyster air screws out which were slightly oversized (not the first time he's had problems with Keyster) and the originals are now reinstalled.
I refitted the carbs (for the third time) at the weekend and it's now idling which was the original problem.
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