1979 GS 850 dies out

Air supply , fuel supply , compression is there ... check valve clearances , Do you have a proper spark tester ? Describe when , and how it dies .. gradually ? Or suddenly ?

Air filter box on or off doesn't it ..
Fresh gas ..3-4 days ago ..premium..carbs are clean..been apart several times ..yes ..pulled float,jet,seat,screen at intake/input clean..
Between 130-150 on compression on all 4 ..nice hot blue/white spark..

When , and how it dies ?

Just a minute usually after it starts and running it'll die out ..or if you try and feather throttle ..it'll die ..

Fuel , Remove and clean carb , check tank and carb vents ....

Bweighmaster said:

Fuel , Remove and clean carb , check tank and carb vents ....

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Carbs been off several times ..5-6 cans of carb clean in the last 2 yrs ..new intake rubber necks using a temporary aux tank as gas tank..yes ..it's clean..inline gas filter ..fresh gas..8-9-10 days ago..premium....new ignition module ..dynatec..
2 new coils..eliminated factory wiring to coils..made a new temporary harness..fuses are good ..all holding 12.4 volts during cranking ..hot wired dynatec poss straight to battery ..no difference ..checked valve lash last year ..don't remember specs..was within spec..compression between 110-140..

It's fuel problem . Quit fishing .. it's not ignition , or starter system , rule out enerything by spraying WD40 into carbs to satisfy your suspicions .....

Bweighmaster said:

It's fuel problem . Quit fishing .. it's not ignition , or starter system , rule out enerything by spraying WD40 into carbs to satisfy your suspicions .....

Click to expand...

Starts and runs on a spray of carb spray ..won't stay running..all 4 carbs not supplying fuel..??
Carbs are cleaner inside than they are outside ..

If ir startswith carb cleaner , its the carbs or gas....