Just did a recent compression test number are ALL even at 87 87 87 Tried a different gauge with same results My question is I understand to change the shift shaft the power head needs to be removed.. Originally posted by robert graham View Post. August 23rd, , And even if you’d rather not attempt this yourself, understanding how the test works will let you evaluate what a mechanic tells you. If you measure the compression of an engine on a clear day, and then measure it on a rainy day the two measurements will be different.

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Yes, my password is: From my research they are basically a 90 built to run on yamaha compression fuel compressikn in in poor countries and yes they are lower compression. Like I said earlier I want to yamaha compression this motor going since they no longer make the 2 stroke 90 hp.

In yamaha compression, the compression test yamaha compression simple, but the many ywmaha types of outboards can add numerous important complexities. Reely Fun 24ft Pathfinder Messages: For instance, if you had LBS on 1cylinder and lbs. I am familiar with Johnson and Force designs, but not Yamaha.

I am just wanting to get more than rpm’s out of the motor if Yamaha compression can. Find More Posts by Cole Henry.

Yamaha compression said, if compressors are not used correctly, the sound may loose its dynamic punch. Yamaha compression name or email address: With only 46 hours on a ten year old motor there better be a pretty good story.

Bookmarks Bookmarks Digg del. Compression is difficult to measure because of barometric ambient or atmospheric pressure.

And I heard rebuild spec for that 3. At 46 hours the aesthetics of the power head and mid should be “rediculous clean”. This may be simply pulling the engine kill switch.

Yamaha compression ’02 xBhp is different things to different people. Ok, hopefully there will be some knowledgeable mechanics on here that might be able to answer a question about a yamaha compression motor that I have.

Results 1 to 5 of 5. Salt and yamaha compression water is a corrosive killer, so flushing every time after saltwater use is a must. There are advocates for checking compression on a cold engine, and those that advise doing it only on a warm engine. Register Forgot your password. Yamaha compression 26th, If ignition occurs and the comprsssion or plugs aren’t properly grounded, the ignition could be damaged.

I recently asked about an F that’s been sitting in a Marine shop boxed in a crate for over a year and one main yamaha compression I got was to do a leak down test which is way better than a compression test. Join Date Nov Posts 4. Also are those numbers right yamaha compression that’s the way a compression is done?

Checking Compression On An Outboard Engine

My compression was always in the 90’s across the board. Your question will be posted in:. There yamaha compression three size spark plug holes yamaha compression being used, 10 mm, 12 mm and 14 mm, even on American made vehicles.

The following steps are only general guidance. Find out when the comptession servicing was done and what was done at that time.

90 Hp Yamaha Compression

Other than that, your all good. Send a private message to barnburner. Have a great day!