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Jan 23rd, 2013
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Yamaha 90 HP 2 stroke Bad Compression #13249462 08/16/19 02:54 AM
Joined: Jan 2003
Posts: 3,799
texcajun Offline OP
TFF Team Angler
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Posts: 3,799
What a pickle. Was informed that I had bad compression on one of my cylinders. I noticed the boat wasn't getting on plane like it used to. Now I have a decision to make.

I love this old 2 stroke. It is still the lightest 90hp out there, and considering I have it on the back of a 16' Scandy White tunnel, I'm reluctant to throw a heavier motor back there.

My question is if it can be rebuilt, would that be the best route to go? I plan on hanging onto this boat for a long time to come. I realize the cost of rebuilding it is gonna run north of 3k. All I want is a motor that's gonna last another 10 years. Should I be able to count on 10 years out of a properly rebuilt motor? If that isn't the case, I will likely go the new engine route.


2002 Scandy White, 2002 Yamaha 90
Point me towards the water!
Re: Yamaha 90 HP 2 stroke Bad Compression [Re: texcajun] #13249704 08/16/19 01:34 PM
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ssmith Offline
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i have a reman obr powerhead 1000.00 940 636 0097

Re: Yamaha 90 HP 2 stroke Bad Compression [Re: texcajun] #13249824 08/16/19 03:08 PM
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Pat Goff Offline
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Rebuilds are tricky.
Cheap rebuild that bores out one hole and slaps in a oversize piston will be cheap, but not good.
There are some absolute pirates in this business, here's two that I've had experience with their work:
Captain Mac in Austin: Rebuilt V6 Merc, actually forgot to put rings on two pistons. And then denied it.
Blackbird out of Pennsylvania, big online/craigslist presence. Customer brought in a V4 Yamaha he'd bought from that scum, not ONE gasket, nothing but orange pookie holding that motor together. "That's better than factory" was the response.
So tread carefully, it's a snake filled jungle.


Pat Goff
Seadrift TX
[Linked Image]

Re: Yamaha 90 HP 2 stroke Bad Compression [Re: texcajun] #13250848 08/17/19 03:30 PM
Joined: Jan 2004
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rb7764 Offline
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If you are mechanically minded and have the time, doing the rebuild yourself is not difficult. It is tedious though. The teardown and reassembly can be done with basic hand tools. Depending on what caused the low compression, the actual machine work is probably the only thing you would need to farm out. Then you can avoid most of the issues Mr. Goff describes above.

One caveat - if the motor has been in salt water, disassembly can be much more difficult.

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