Tear in carb diaphram!? Bike dying

Bike keeps dying when I let of the throttle. Had the carbs off and found a couple open slits on the diaphrams. I posted a pic of one of them. The other diaphram has a couple of teeny tiny rips in it. Will this cause the bike to die like that ? Everything else is in check. Anything I can put on there to seal the openings or do I need to buy new ones?

Your throttle response will be a lot out with split diapragms, also you risk holing a piston(s) due to weak mixture.

I just paid £35 for one diapragm, i did a temporary repair with super glue but it won't last.

This guy is really good, he knows motorcycle carbs back to front. Also a mine of advice on tuning and settings

www.nrp-carbs.co.uk/shop/

Get new ones. I know they aren't cheap but look how long those lasted. Never run right without them. ALL of them.
Steve

Hold them up to light, splits start as tiny pinhole almost invisible. I almost missed the split on mine.

I'd advise checking these very carefully given the age of these bikes. Not being a drama queen here, but a split diapragm and a long fast run could be a piston wrecker.

Tjats what i did lol. One of the slits is about 1/8 of an inch long lol. And there's a couple of other little holes I can see right through. I'll be replacing as soon as possible. But would these tears cause the bike to die when I let of the throttle like it has been?

Your idle mixture is leaned out -actually everything from shut off to wide open throttle. What was set up right with intact diapragms is now all wrong with the splits.

Two reasons: the manifold vacuum won't lift the slide and needle like it should, also you are bleeding air in...almost like adding another pilot circuit. This is where a muppet would try to tune it out rather than getting to the root problem.

It is an easy fix, but they are quite expensive.

check out jbmindustries.com/

I have never used them but have heard good things and bookmarked their page for when I might need a set for my bike.

Prices look quite reasonable

Awesome guys thanks! Will be ordering new ones Monday