Cylinder with 113 PSI

[rainman99]

I Have a 1985 90 HP Johnson. I bought it this May it had a compression of 123/123/120/113 PSI. Put over 80 hours on it and ran great with no problems. The compression stayed the same at the end of the season. Should I worry about this low cylinder? Hoping for another good season or 2.

Rainman

 

[ezmobee]

Re: Cylinder with 113 PSI

Should I worry about this low cylinder?

I sure wouldn't. You're still within 10% across the board.

 

[tashasdaddy]

Re: Cylinder with 113 PSI

do a decarb on it. hopefully if will clean up that cylinder. it is still within 10%.

 

[Barnacle_Bill]

Re: Cylinder with 113 PSI

That is still less than 10% difference. I wouldn't worry about it right now.

 

[rainman99]

Re: Cylinder with 113 PSI

Thanks to eveyone for your opinons. Did decarb had no efect. Will just keep takeing good care of it and going to rebuild carbs before next season. I will be seeking advice at that time. Going to order kit now.
Thanks again .
Rainman

 

[Knightgang]

Re: Cylinder with 113 PSI

I would not worry about it either. You are still within tollerance...

 

[emdsapmgr]

Re: Cylinder with 113 PSI

You did not mention which cylinders had the stated compression numbers. It is not unusual for the crossflows to have different compression readings between each bank. All depended on how the block was originally machined by the factory. If the two 123 readings were on one bank (head,) and the other readings from the other bank, it's a normal thing. Anyway, you are fine the way it is regardless.

 

[bob johnson]

Re: Cylinder with 113 PSI

if it makes you feel better throw sand in the three good cylinders to knock them down to about 113 PSI...then youd be all set


I make joke!!

bad bob