texasfishingforum.com logo
Main Menu
Advertisement
Affiliates
Advertisement
Newest Members
Fred Neal, Richard Dillon, DinkKing, Headogears, Rebecca Carroll
111003 Registered Users
Top Posters(All Time)
TexDawg 91,405
hopalong 81,092
Pilothawk 78,477
John175� 72,352
JDavis7873® 67,395
Derek 🐝 62,647
Tritonman 58,713
Bigbob_FTW 57,746
Mark Perry 56,209
facebook
Forum Statistics
Forums60
Topics756,802
Posts9,502,813
Members111,003
Most Online36,273
Jan 23rd, 2013
Print Thread
Yamaha 90 HP 2 stroke Bad Compression #13249462 08/16/19 02:54 AM
Joined: Jan 2003
Posts: 3,785
texcajun Offline OP
TFF Team Angler
OP Offline
TFF Team Angler
Joined: Jan 2003
Posts: 3,785
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
Joined: Nov 2007
Posts: 3,847
ssmith Online Content
TFF Team Angler
Online Content
TFF Team Angler
Joined: Nov 2007
Posts: 3,847
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
Joined: Jan 2005
Posts: 6,193
P
Pat Goff Online Content
TFF Celebrity
Online Content
TFF Celebrity
P
Joined: Jan 2005
Posts: 6,193
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
Posts: 2,159
R
rb7764 Offline
Extreme Angler
Offline
Extreme Angler
R
Joined: Jan 2004
Posts: 2,159
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.

Previous Thread
Index
Next Thread


© 1998-2019 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide
Powered by UBB.threads™ PHP Forum Software 7.7.3