Guess who was TOWED in today ??

[Skools Out]

MJ if i were closer to ya i'd say send the power head over and i'd pop a piston it her for ya and re-ring her.

[bigshrimpin]

The carbs should bolt up . . . It's probably better just to use the 150 carbs . . . clean them real good and get rebuild kits.

There are a lot of parts to make a 150 into a 175 . . . besides just the carbs. I'm not totally familiar with the mods for the Yamaha Blocks and the differences b/w the model years. You could always compare the part numbers.

Usually it's the carbs, reeds, heads, exhaust that tune the motor. The block is usually the same . . . Some Merc's have a horizontal front half and others had a verticle front half. Motors with a horizontal front half usually produce more HP. I think the same is true with the Yamaha 2.6 excel/220special and the regular block. Just ask around screamandfly.com or byuboyz.com . . . those sites are full of good info for a rainy day when your not going fishing.

Just compare the parts

http://www.yamaha-motor.com/outboard/parts/home.aspx

Ray Neudecker on boat setup had some good information.
http://www.boatsetup.com/noncgi/ulti...=000754#000000

[Skools Out]

here ya go since you alreadyhave a good lower unit just buy this one

http://cgi.ebay.com/ebaymotors/1985-...QQcmdZViewItem

[Skools Out]

here's ya a parts site

http://www.boatpartstore.com/yamaha....ower&val=8

[bigshrimpin]

This link has lots of good information about the 2.6L Yamaha.

http://forums.screamandfly.com/forum...ght=Yamaha+2.6

[76GMC1500]

Since you have nothing to lose, pull the head and take pictures. Make sure the piston is still there. It may be something as simple as broken rings on that piston. A quick hone and some new rings and you'll be good to go.

[bigshrimpin]

Hone and swap a piston out from the parts motor.

http://cgi.ebay.com/ebaymotors/Gaske...QQcmdZViewItem

The pic shows head gaskets in the set.

[bigshrimpin]

I still think BR's motta is a better move, but you got nothing to lose by taking the head off or tearing down the whole motor. It's the best learning experience if you've never pulled one apart.

[reelapeelin]

Skools, ya think w/ "0" compression it could be only minor damage in that cylinder?... ???...

[Blue_Runner]

Let me dig up that old post with the pics and specifics about my motor...

And yes, I'll hold onto it for a while - its been 10 months already!! ::)