1980 85 hp johnson with 115 carbs ??

[321lawncare]

i have some 115 v4 johnson carbs will they make a diffrence on the 85 ? can i run them ? what is the diffrence betweena 85/90/100/115?? just cabs ?

 

[321lawncare]

Re: 1980 85 hp johnson with 115 carbs ??

?????????

 

[ezeke]

Re: 1980 85 hp johnson with 115 carbs ??

The intake ports on the 85HP are 5/8"; the ports on the 115 are closer to 15/16". Generally, the 115 carbs will waste fuel unless you have the ports enlarged. It would also be better if you used the 115 cylinder heads.

 

[321lawncare]

Re: 1980 85 hp johnson with 115 carbs ??

so it wouldnt do anything no power gain?

 

[kenmyfam]

Re: 1980 85 hp johnson with 115 carbs ??

Just my thoughts but I would leave it be !!!

 

[321lawncare]

Re: 1980 85 hp johnson with 115 carbs ??

alright thanks guys

 

[emdsapmgr]

Re: 1980 85 hp johnson with 115 carbs ??

I run a set of 74 135 carbs on my 79 85 hp engine-but I did port the block when it was down for overhaul and I added the intake filler blocks. I run the 135 carbs jetted as is. Stock heads. You should be ok running the 115 carbs. They might overfuel slightly on a stock block, but you should see some top end rpm gains. I'd follow ezeke's recommendation on the heads.

 

[321lawncare]

Re: 1980 85 hp johnson with 115 carbs ??

how will i know when its over fueling