Pilot screw spring (idle mixture spring)

[Gs650eAUS]

Hi,

I’ve searched high and low but can’t find where I can buy a couple of OEM springs for my 81 GS650e.

People saying to use bic pen spring etc but I want them all the same, and I figure they must be available.

Schematic on the spares websites show a completely different set up, however I believe mine to be factory?

[Gs650eAUS]

Another picture for reference

[Big T]

Show us your set up for reference

[Gs650eAUS]

Thanks for the response, that top thumbnail is my set up. Mikuni BS32SS carbs. Also, the tip of the screw isn’t ultra pointy, slightly flat at the end. They’re all the same, is this normal? When I carefully wind them in without springs, spacer and o ring I can’t see the point extend into the carb body.

[tom203]

Thanks for the response, that top thumbnail is my set up. Mikuni BS32SS carbs. Also, the tip of the screw isn’t ultra pointy, slightly flat at the end. They’re all the same, is this normal? When I carefully wind them in without springs, spacer and o ring I can’t see the point extend into the carb body.

Here's a typical measurement from one off my bike. Aftermarket ones with spring/washer/oring are available . A pen spring should work ok, as it's just putting drag on screw

image.jpg

[Gs650eAUS]

Thanks Tom!

I’ll try and chase a couple down. Pen spring should work indeed, but if I can find a couple I’d rather do that.

Like the 650?

[LAB3]

I wouldn't think twice about substituting that spring, it's sole purpose is to put tension on the screw so it doesn't turn from engine vibration. It's not much different than using a lock washer.

[Gs650eAUS]

Ok, thanks. Might look into it.

when I remove spring and o ring etc and gently wind them down until I get tension, I can’t these the tip of the pilot screw protruding on the inside, is this normal or should I see the point? (Are mine damaged?)

[Big T]

You might try a hardware store for a spring.
My local store has a good stock of them, fixed the kill switch on my DRz that way.

[Steve]

Most likely will NOT see the point when the screws are lightly seated.

.

[Gs650eAUS]

Thanks Steve,

They must be right then.
cheers

[londonboards]

If one of the tips of the needle is flat, it has most probably broken off. They usually end up stuck on the pilot hole in the carb body.

Make sure the tips are not still in there and replace any broken needles.

[Gs650eAUS]

Would you have a picture by any chance? I think they’re all slightly ‘squared off’ and not pointy

[londonboards]

https://www.jadusmotorcycleparts.com/single-post/2016/09/04/XS750-Carb-Repair---broken-airfuelpilotmix-screw-tips

[tom203]

Would you have a picture by any chance? I think they’re all slightly ‘squared off’ and not pointy

The ones that I have looked at are not completely pointy...more like the sketch I posted...slightly "squared off"