RD400 Jerking while deceleration

[KANDY]

Hi All,
1976 RD400, the bike is Jerking on Deceleration, goes away if I give a littlte throttle. Never observed in my RD350's. What is the cause and how to reduce/eliminate. Front Tyre 100/90/18. No issues Riding at any speed from 60 to 90MPH, The issue stats when down shift and decelerate.
Thanks

[scully]

closed throttle lean. close airscrew a bit or bigger pilot jet.

[KANDY]

Will try that, Thanks Skully.
Looks like not many have this issue here.

[m in sc]

check chain adjustment as well

[2steve]

Will try that, Thanks Skully.
Looks like not many have this issue here.

I certainly had that issue. Coasting slightly downhill in a neighborhood.
Can't ever remember if it's lean, or rich - LEAN  
Dave F mod in the carbs still does it on a 400, too.

Loose chain is also a very real thing.