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JIS Screwdriver for 400/4 Carb slide screws -Trying to source correct fit please

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400 Cafe Racer:
Hi Guys,

I need to adjust the Carb needles onto the next slot down, the PO has set them too high and now float levels are correct its far too rich. He has lifted the needle 1 extra notch to gain more power, but they are far too rich on steady cruising. The A/F ratio is about  9.5:1, so I think they need to go back to the standard position.


Having looked at the access within the slides there is little clearance to get a screwdriver blade of small diameter down to the JIS screws to be removed in order to change the needle height, it is also a bit difficult to judge the correct snug fit head size. The "T " bar JIS set I have is too wide to reach down, but the US Pro JIS screwdriver set looks a possibility.

The heads of the screws look good, but they seem very tight. I just want to ensure everything is a good fit, rather than risk chewing the screw heads badly.

Can you advise from your experience on  the cabs, which is a good fitting tool/screwdriver please. :)

Many thanks

Dennis

Kelly E:
Have two sets of JIS screwdrivers, my favourite set is the Vessel Impacta set. They are quality JIS screwdrivers that are also impact drivers. They have saved my butt many times, awesome for removing stuck engine cover screws.

McCabe-Thiele (Ted):
I bought these sorry can't remeber which one fitted - not top quality but they have done the job.
My impact ones are just the short type that go straight into my cordless tool for engine case bolts.
https://www.ebay.co.uk/itm/333425969113?hash=item4da1bc87d9:g:9LcAAOSw-eld6T6v

Seabeowner:
On the 500 I have always used the Honda toolkit driver with T bar. I think the slide is 26mm o/d on these. You're right the screws are firm, but grip the slide in your left fist (if you are right handed) and press the driver into the head and they break free. I suggest using the biggest dia shaft as you can.

TrickyMicky:
Definitely a JIS No.1 driver. The T-bar in the original Honda toolkit is perfect. screwdriver 'bit' sets are ok, but the bit holders can sometimes prove to be too wide for confined spaces. JIS conventional screwdrivers are worth investing in.  If you wnt to play around with really small stuff, try and lay your hands on a camera screwdriver set, very small but still JIS standard.

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