acceleration

[commissioner]

I have a 1985 175Hp Johnson<br />It will not accelerate under load<br />In the yard with ears it accelerates <br />the fast idle works <br />but in the water under load it stalls no matter how slowly you advance the controll<br />compression is poor but I was hoping to get through this season before rebuilding<br />compression is 60-65 to 80 with the average being 70-75

 

[The Marine Doctor]

Re: acceleration

<br /><br />Sounds like you found your answer.<br /><br />TMD

 

[Solittle]

Re: acceleration

Before you trash your motor do a thorough decarb on it and check the compression again with a different compression guage (in case the one you have is faulty - common problem).

 

[OBJ]

Re: acceleration

Commish....to add to solittles good advice, change out the spark plugs if you haven't for a while.<br /><br />The reason it idles well in the yard is there is no back pressure against the cylinders like there is when the rig is in the water. Makes a big difference as you already know.

 

[Boatman]

Re: acceleration

Hate to say it, but my expirience tells me with that low of compression on all the cylinders. Its time for an overhaul.<br />De carbing it might help, but I doubt it will work magic.<br /><br />Try that first you wont be out much.