Compression numbers

[JWBERT427]

I have a 2016 SWB 800 Pro S with 108 hours on the engine,
(around 4000 miles I think) I just did a compression check
on the engine stone cold, (could not run it right now) and
came up with 110# on both cylinders, is this ok?

 

[OutCast]

Depending on what guage you have the number is whats important. I have a cheaper autoparts store guage and both my Engines read 110. I have had the sleds since new and also documented the Compression reading, so I know my base numbers and current and I am only off by maybe 1-1.5psi since new.

 

[JWBERT427]

Depending on what guage you have the number is whats important. I have a cheaper autoparts store guage and both my Engines read 110. I have had the sleds since new and also documented the Compression reading, so I know my base numbers and current and I am only off by maybe 1-1.5psi since new.

Good to know, I was wondering about the accuracy of my gauge, unfortunately I did not take
a base reading when I bought the sled new.

 

[Bigfuse]

Not all compression gauges read the same.

 

[Ottawaair]

Personally, I would replace the pistons .

Compression numbers won't show how much piston wear and rocking is going on in there .

My buddies '16 pro s broke a skirt at 4500 miles . Was running perfect up to that point .

In the real world of 2 strokes, we seem to expect way to much from these motors .
Motor cross riders replace every, season, every race, every 10 hours.......
Whatever the case may be .

 

[ZR SLEDHEAD]

Key to decent piston life is being anal about proper warm up and running good oil. Life expectancy, I'd think 7000 miles is not unreasonable.

 

[ianwalsh1]

I have a 2016 SWB 800 Pro S with 108 hours on the engine,
(around 4000 miles I think) I just did a compression check
on the engine stone cold, (could not run it right now) and
came up with 110# on both cylinders, is this ok?

Follow up? How did the sled perform after this post?

 

[Mike-DRH]

You should use the compression numbers for comparative readings and not so much the number itself for reasons already mentioned. I have a 2019 800 Rush with over 17,000 miles on it and still runs great. I don't care what the compression numbers are, they won't tell you much. The only engine related failure (so far) is a exhaust valve stem broke off at the blade. I'll ride it again this year and put somewhere between 5 and 7 thousand miles on, maybe I'll tear it down after this year.