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Old 25 May 2014, 08:48   #11
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Old 25 May 2014, 08:51   #12
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and yes was a rubber gasket between carb and engine and put a little gear oil round it when I replaced
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Old 25 May 2014, 12:47   #13
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The picture could be deceptive but that water sure looks inky black!

To rule out cylinder head issues invest in a compression tester. Draper do one for 25 so it won't break the bank. Remove both spark plugs and screw the compression valve into the spark plug thread. Turn the engine over and take a note of the reading. Both cylinders should be within a few PSI of each other.

If that's not conclusive, run the engine and lightly feel around the head gasket for any fuel/oil once it's been cleaned up prior to starting.

The carbs needs to be removed and completely stripped down. Use the right size screwdrivers to remove the jet nozzles and ensure air passages are clear with compressed air. Soak in carb cleaner, thoroughly wipe down with a clean cloth and reassemble. Don't adjust the fuel/air pilot screw. If you are going to check, then screw in (counting the number of turns) until lightly seated. I'd have thought it would be 1 1/2 turns out.

If the 'o' ring where the carb meets the engine head block looks worn, then go ahead and replace.
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Old 25 May 2014, 14:34   #14
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Slacken off the fuel pump. 2x 10mm bolts and pull it away from the engine block. Pump the primer bulb and watch the fuel come out the small hole between the two bolts. You need a fuel pump diaphragm. And before you try run it again get a bigger bucket you need another 4 inches of water, your going to burn the impeller out.
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Old 25 May 2014, 14:38   #15
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Simple questions for Yamaha 25hp 2 stroke

Fuel pump is fubar. That's unburnt fuel in bucket.
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Old 01 June 2014, 05:31   #16
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Quote:
Originally Posted by Davie View Post
Slacken off the fuel pump. 2x 10mm bolts and pull it away from the engine block. Pump the primer bulb and watch the fuel come out the small hole between the two bolts. You need a fuel pump diaphragm. And before you try run it again get a bigger bucket you need another 4 inches of water, your going to burn the impeller out.
Thanks

I followed your instructions and sure enough the diaphragm had a huge split.

Thought I'd get a fuel pump kit. Probably a new impeller too (seems like a good idea to change this). I'll add a bigger bucket to the list too.
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