1998 Johnson Venom 200 Compression

[Apraser99]

Can someone tell me if these compression numbers are okay on this motor?
The motor compression is:

#1 100
#2 100
#3 100
#4 100
#5 98
#6 90

Mechanic told me that #6 running lower on that model is acceptable and normal.
Thinking of buying this on a 1998 201 ProElite.
Thanks!
Carl

[TRITON20]

all cylinders are within 10% of each other which is good----i just wonder if they all are not just a tad low though--i thought strong compression was around 115-120 but that may be incorrect

the numbers being within 10% show the cylinders are all "wearing" at about the same rate and problably not anything drastically wrong with one cylinder vs. another

hey rude gurus----am i right or wrong


i am currently working on my junior to the junior mod that assists the junior mod that assists the senior mods status

[Luke]

your numbers look good to me
if i remember corectly i belive that #6 will always be the lowest in compression
but the mods will be here soon and can verify that

[1993392]

Agree with the others. My 94 Venom rangers from 105 to about 112 lbs. Have also heard the story about #6 running a little lower. Were these numbers from a hot or cold engine ? When was thelasttime youdid a decarb ?

[Bassmeister]

The lower 2 cyls will usually be a little lower. The #'s arent as important as different gauges will read higher or lower as long as they are within 10% over all with the same gauge!!

[THE WITCHDOCTOR]

Agree with Bassmiester... all look acceptable to me... Did you check them with the throttle plates open or closed?

[Apraser99]

I was not there so I'm not sure. I was told the compression should be around 115. If that's the case should I stay away from this motor?

Thanks
Carl

[THE WITCHDOCTOR]

No, just try another gauge...

[ChampioNman]

Give it a a big doushing of tuner and re-test the comp. The motor is solid but a real good decarb will bring the bottom #'s up (maybe). The bottom 2 is where all the junk settle 5 and 6 and are the most suspect to ring stick. The #'s ain't bad yet and I'd buy the motor, but just be aware that you need a REAL good de-carb of the motor.

[RUSTY63]

This motors lower 2 cylinders will be a tad lower than the upper 4 and that is acceptable.