1978 kz650 sr 1980 moter and carbs

sr man wrote:

I have a tester that i put inbetween the wire and plug to check for spark if thats what u mean

The tester likely indicates when the spark plug is receiving at least "some" electrical current at "some" time.

Imo, a better test for spark existence and quality is visual inspection with the plug removed and held against engine head while spinning over the engine with electric starter and ignition switch turned ON. Look for fat blue spark.

This of course doesn't assure a correctly timed spark. Imo, dynamic timing with a strobe type timing light is more accurate than static timing with an ohmmeter or light bulb.

Should be able to see the advancer quickly move back and forth as rpm is varied by blipping the throttle.

Good Luck!

Its good spark not a weak spark, I have timed to spec with light timing is dead on, No points dana ing new 3.0 ohm coils and wires

16-40 sprockets

What carbs you got? Carburation could be out of whack

120-8 stock 1980 E ltd
I completly went threw the carbs full dissemble and replaced all parts that u can even acc pump. When I set the vacc with my gages I couldnt get them 18 22 so I set them at about 10 so they would all be the same is that odd

sr man wrote:

16-40 sprockets

Isn't stock gearing 16-42? Missing two teeth on the rear sprocket would account for some of the low end power loss.

SPROCKET-HUB,40T,BLAC
KZ650-D1/D1A 590010-001
This is from bike bandit

You are correct, Kawasaki.com also says it's a 40 tooth. The standard for KZ650's is 16/42. They must have had a different riding style in mind for the SR's. My KZ650 pulls pretty decent low down then gets a little rush at about 6-7000rpm.

The 16 inch rear wheel is why

Imo, with good properly timed spark and functioning advancer, and acceptable compression plus correct valve clearances, running horrible at lower rpm is likely due to an issue still remaining in the carb pilot circuits, regardless of prior cleaning efforts.

Good Luck!

sr man wrote:

The 16 inch rear wheel is why

Oh right, forgot about that!

I pulled carbs off last nite and on the acc pump fuel bowl the check valve was missing I must of forget to install when I rebult must be a prob. Is there a easy way to get the carbs back on the bike