What have you done to your XS today?

[Paleomechanic]

Wires buttoned up … everything actually works !!

 

[Primo]

Almost finished up my left side mid control. Then realized at dinner a better way to do a couple of things so I think I'm going to cut these TC bros universal forwards up a bit more tomorrow. I also continued to strip the spray paint off the engine. The right side is looking pretty good, this side not so much. I'll blow it apart next winter for a proper cleaning.

 

[Dom]

Literally nothing done to the xs today but why do I have a burning desire to get a CB550 to play around with?!

I'm going to have a hard time 'justifying' this one I think....what can I sell?

 

[Adamc]

Thinking I may have a fuel starvation issue, as the supply tube had a slight uphill to the carbs. Shortened and re-route the tube. It’s all down hill from here!
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[Adamc]

Also noticed the M-Gadget bar end indicator had worked itself out due to vibes. A few turns on the expanding rubber shaft, shove it back in the bar and retighten.

 

[Adamc]

If I may suggest; One of the first things I'd do, given your symptom, is remove the pods and check for proper diaphragm/slide operation: start it up and peer into the bell and verify the slides are lifting with rpm. If not, or if they flutter @2000, press the choke rod in (attempting to overcome a leak) and see if the slides respond. Otherwise I'm also paying particular attention to the diaphragm operation (14sec drop test)

Went back over @jpdevol suggestion.
OK returned to the carbs and decided to disassemble and clean yet again; no issues found.
On reassembly I did the slide drop test; and low and behold the left slide was just falling too quickly.
Took out the slide again and rechecked the diaphragm with a very bright Milwaukee LED pen light:

A tiny pin prick hole in a crease of the diaphragm; easily missed.
I'm hoping I have found the issue now with getting over 1/4 throttle.
I will have to source a new diaphragm / slide to fix this.
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[jpdevol]

That'll do it Adam - good catch! Hoping that fixes it...

 

[bosco659]

Always good to find the source of a problem. Here’s where many get their diaphragms.

http://jbmindustries.com/

 

[Jim]

Good catch Adam. A little smear of fuel proof RTV and you'll be able to find out if that's your only problem.
I believe Cruzinimage.net sells diaphragms too.

 

[Adamc]

Always good to find the source of a problem. Here’s where many get their diaphragms.

http://jbmindustries.com/

Thanks for the link @bosco659

 

[Adamc]

Good catch Adam. A little smear of fuel proof RTV and you'll be able to find out if that's your only problem.
I believe Cruzinimage.net sells diaphragms too.

Thanks @Jim
what is RTV?

 

[Jim]

It's a rubber sealant...

https://en.wikipedia.org/wiki/RTV_silicone

 

[Jim]

A little dab on the hole in the diaphragm.... let it dry and see if that fixes your problem.

 

[5twins]

Yes, Cruizin Image has very reasonably priced complete BS34 slide/diaphragm assemblies .....

https://www.cruzinimage.net/2018/07/23/80-83-yamaha-xs650-carburetor-slide-piston-rubber-diaphragm/

They also have a very nice BS34 rebuild kit that includes not one but two different adjustable needles .....

https://www.cruzinimage.net/2017/07/26/80-81-yamaha-xs650-carb-repair-kits/

 

[Adamc]

Yes, Cruizin Image has very reasonably priced complete BS34 slide/diaphragm assemblies .....

https://www.cruzinimage.net/2018/07/23/80-83-yamaha-xs650-carburetor-slide-piston-rubber-diaphragm/

They also have a very nice BS34 rebuild kit that includes not one but two different adjustable needles .....

https://www.cruzinimage.net/2017/07/26/80-81-yamaha-xs650-carb-repair-kits/

View attachment 244960

Cheers 5T

 

[Dom]

Went back over @jpdevol suggestion.
OK returned to the carbs and decided to dissemble and clean yet again; no issues found.
On reassembly I did the slide drop test; and low and behold the left slide was just falling too quickly.
Took our the slide again and rechecked with a very bright Milwaukee LED pen light:
View attachment 244950

View attachment 244951

A tiny pin prick hole in a crease of the diaphragm; easily missed.
I'm hoping I have found the issue now with getting over 1/4 throttle.
I will have to source a new diaphragm / slide to fix this.
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I believe it was something like this that lead to my first child

 

[Adamc]

A little dab on the hole in the diaphragm.... let it dry and see if that fixes your problem.

Jim, would that be a permanent fix; or just a get by?

 

[40north]

Yesterday took the ol' gal out 'round the village, 25 miles mostly quiet back roads, and mostly alone. The flatslides are both lefties, and that makes the right side hard to get right (it's a bit rich), but she goes good. I need to fit new gaiters or dust covers, like oil changes, I'll think about it. The heat shields are nice. She used to melt sneakers. Meantime honeydues... Riding the XS street-track always reminds me of riding a '67 500TT Triumph for the first time. To-day is sportster day, maybe. My orders haven't been posted yet...

meantime>

 

[Jim]

Jim, would that be a permanent fix; or just a get by?

Call it semi-permanent..... Here's my routine for diaphragm repair.
Clean both sides with a good solvent such as acetone or lacquer thinner. Apply a thin layer to both sides of the hole. The thinner the better. That'll usually get you a year or more.

 

[Adamc]

Call it semi-permanent..... Here's my routine for diaphragm repair.
Clean both sides with a good solvent such as acetone or lacquer thinner. Apply a thin layer to both sides of the hole. The thinner the better. That'll usually get you a year or more.

Cheers Jim
I went ahead and bought a pair of these from Yambits.co.uk

Should be here by the weekend; hopeful I get a ride.
Old ones into the spares pile.

I tried curzinimage, but they wouldn't accept my payment for some reason.
Anyhow Yambits should be faster.
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