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Are these ok compression numbers?

DimitriT

DimitriT

Forum Sage
Past Site Supporter
1982 GS550LZ

Cyl#1 135
Cyl#2 128
Cyl#3 130
Cyl#4 130

Cold and dry numbers.

Bike has 60k miles but the head is a bit younger (maybe 40k) and the sleeves were replaced about 20k ago (did not hone or replace rings at that time).

Bike runs fine but needs a little gulp of extra air with choke to start cold.

Also I am looking for shims on the thinner end (2.55 to 2.60). Can someone point me to a source please.
 
Z1 has shims for $6/each.

Your compression numbers are okay. Proper test method is hot engine and throttle held open.

BTW, once you figure out what specific shims you need, PM me, and I'll check my stash.
 
Last edited:
Your bike is supposed to need the choke to start (cold). And Suzukis are notoriously finicky on cold start up, prompting Cycle World to celebrate when the choke control was moved to the left thumb.
 
Rob S. said:
Your bike is supposed to need the choke to start (cold). And Suzukis are notoriously finicky on cold start up, prompting Cycle World to celebrate when the choke control was moved to the left thumb.
Click to expand...

In my case I find that if I add choke and crack the throttle for a split second while cranking it, it will start strong every time. It seems to like a little extra air in that starting crank. Probably to help with compression.
 
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