Carb Sync Jam Nut Frustration

[danny01975]

82 GS1100 GK. I got a carbtune so I could sync the carbs since I changed the exhaust. Works well and I was able to get them all very close. That is until I try to tighten the jam nuts holding the adjustment screws. Especially the #2 which is directly below the throttle cable bracket. It was an exercise in futility.

Is there a special tool for tightening these? Or a trick for doing it? It’s way too crammed to get an 8mm wrench in there.

[Nessism]

Motion Pro sells a nice tool. It's true that tightening the nut can affect the sync. Some trial and error involved, and the tool makes that easier.

[danny01975]

Motion Pro sells a nice tool. It's true that tightening the nut can affect the sync. Some trial and error involved, and the tool makes that easier.

Are you talking about the 90 degree tool or something else? That 90 degree tool would be useful but it won’t allow me to hold the screw while tightening the jam nuts holding

[dgates1]

Are you talking about the 90 degree tool or something else? That 90 degree tool would be useful but it won’t allow me to hold the screw while tightening the jam nuts holding

It is essentially a long tube with an 8mm socket on the end with a long screwdriver that goes down the middle of the tube.

[dgates1]

Funny.. I was just researching this as I am getting ready to sync my carbs. From what I read it is easier to access the 2-3 adjustment screws if you move the choke cable mount out of the way, but still a little difficult. This give you just enough room to get that tool in there, but may still be a little angled.

I have read the "Famous Nert Sync Screw Solution" and it seems a little extreme but I guess it works -

http://bwringer.com/gs/syncmod/NertSyncKit2.pdf

My question is if anyone ever came up with a replacement screw and spring for these to eliminate the nut?? I read several old threads on it but seemed to die on the vine.

https://www.thegsresources.com/_forum/forum/technical-forums/old-technical-info-forum/18440-replacing-the-cv-carb-sync-screw-locknut-with-something-better

I can get a pack of (3) 5mx20mm (0.5mm pitch) hex head screws from eBay for only $5.90 shipped.

Did anyone ever figure out what size spring would work for this?? I'm assuming a 7 or 8mm OD spring would work but what length? I'm thinking 10mm length would do the job...

[Nessism]

Sadly, Motion Pro may have discontinued the tool in question. This is a knockoff that should work, though.

https://www.z1enterprises.com/carb-adjustment-tool-set.html

[danny01975]

Sadly, Motion Pro may have discontinued the tool in question. This is a knockoff that should work, though.

https://www.z1enterprises.com/carb-a...-tool-set.html

Thanks! I agree, the spring / replacement screw solution would be best. I might just give that a try!

[salty_monk]

Would be pretty interesting to see if the spring works. I bet you'd need a pretty strong spring. Also makes you wonder why they didn't do it that way originally, my guess is that it would creep.
Yeah, pretty impossible to do without that tool....