135 and 200 powerhead swap?

[phatmanmike]

hi, i posted this at screamandfly.com also..... thought id ask the gurus here too....<br /><br />i have a 1988 merc 2.0L 135hp v6 complete motor and a 1987 merc 200 2.5L bad motor with a good powerhead...<br /><br /><br />can i put the 2.5L on a 2.0L midsection?<br /><br />the 200 is a complete motor, but the lower unit is cracked bad and the midsection is toasted. the 135 is pristine, in fact, i have 2 of the 135's<br /><br />its not that the 135's are bad, they work perfectly, but i have a 20' sportcraft center console and its a heavy boat. i had a 225 jomson sea drive on it, but thats gone now. it made the boat go 52.6mph via gps. now i have a stainless marine single engine bracket w/full swim platform and 30" setback. i was gonna put the 135 on the boat, and keep the other as a spare, but now i have this other 200hp 1987 motor too. the 200 merc would make the boat go much better rthan the 135 would, im thinking.<br /><br />any ideas, please email me phatmanmike@yahoo.com or call me 727-643-1661 my cell in largo florida.....<br /><br />my wife and i are going to the keys , camping at biscayne natl park the second week in march, and need the boat ready by then. it now has no motor or steering.<br /><br />live near by? wanna help? wanna trade the 2 135's for a single 225?<br /><br /><br />phatmanmike@yahoo.com

 

[andy6374]

Re: 135 and 200 powerhead swap?

The only problem, I think and I am not expert nor have I done this, is the different gear ratio between the 135 & 200 hp models. I imagine both engines have the same shaft length, right?<br /><br />I bet some senior iboat members will know for sure.<br /><br />Your boat will sit alot better with weight loss going from the 135's to a single 200. The 200hp will also put alot less stress on your transom.<br /><br />Good Luck

 

[bigshrimpin]

Re: 135 and 200 powerhead swap?

They will bolt together no problem. 135 has a 2:1 gear ratio and the 200 usually has 1.87:1 . . . so you will need a different pitch prop. Make sure to swap the exhaust tuners from the mid section too.