25hp 2 stroke 3 cylinder Johnson

[Fuelblendr]

If you have bored the motor, more CI, check the plugs when you switch to the 50:1,
You mentioned the 25hp jets. My .02

[speedfreak]

Fuelblndr,
I put a new set in after the break in of 25:1 fuel. Is that what you meant by check the plugs?

[proprider01us]

I'm pretty sure he meant to check to see if your too lean. You may want to consider putting bigger jets in if you increased the bore size and made the intake track more efficient with aftermarket reeds.
Just my thought.

[speedfreak]

We replaced the 25 hp jets with 35 hp jets.

[capnzee]

It is still a good thing to check the plugs soon after you have made changes to the carburetion, ignition etc. By checking the plugs you will see exactly how the engine is running in the combustion chamber. Remove the plugs and look at the gap end. If the plugs are white/gray (chalky) looking you are running too lean. If your plugs are black and oily looking, you are running too rich. If your plugs are brown, you are running pretty close to where you want to be. Look out if your plugs are chalky white!, in fact I would not run it again until you "richen" it way up.

[speedfreak]

Just checked the plugs I pulled out yesterday and they are brown in color.

[Tim Kurcz]

Just checked the plugs I pulled out yesterday and they are brown in color.

http://www.boatracingfacts.com/forum...t=7707&page=17

Hey Speedfreak, In case you hadn't seen this before. I built this 35HP OMC triple for my son's 11' runabout. It runs 55MPH at 5750 RPM on the A15 racing gearcase. If you need to run a shifter, contact Ron Hill for a racing prop.

Tim

BTW: You'll want to get 35HP carbs and open up the airbox.