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Your cart is empty.For use in engine tune-up to remove gum and varnish build-up, excessive carbon deposits from rings, pistons, valves and ports. Spray through air intake of 2 and 4 cycle engines for improved performance. Not to be mixed with oil.
GBR
2025-08-15 14:33:25
I have a 96 Johnson 90hp outboard and I've done a few things to try and get it running happier at idle instead of dying. Before trying this I'd done Seafoam and other fuel treatments, and replaced the plugs and wires. Ran better but I still felt there was something lacking.I bought this engine tuner on a whim based on the great reviews but I was skeptical, figuring it would be no different than Seafoam. Not so. Ran the whole can through the carb throats as the instructions state, which took about 15-20 minutes. Couldn't spray much at once since it would bog down the engine. Still wasn't sure there would be much change. Then allowed it to sit overnight and ran it again 15 minutes the next day as instructed.Well, I'm giving it 5 stars. Engine runs smoother at idle and doesn't want to die on idle in the water like it used to. Well worth the money and I highly recommend it. I think it runs quieter now at all RPMs so the wife is happier too. I'll probably make this part of my annual maintenance going forward.
Zim5
2025-08-01 20:21:24
This stuff works great. On everything. Used a whole can as directed on my FICHT engine. There already was much less smoke near the end of the can. After letting sit for 24 hours there was some smoke at higher RPMs as the residual carbon was being burned off. There was black oily residue on the grass by the exhaust from the carbon. Boat engine ran so smooth after. I also used this to clean the carbon deposits off my piston and cylinder head of my lawnmower when I replaced the head gaskets. Dissolved it right up. I will order more and use this on not only my boat yearly, but also on all my small engines.
Tim Hibler
2025-07-04 21:22:08
I had been having problems with my 150 HP Johnson outboard motor maintaining an idle, hunting and an occasional back fire. A boat mechanic recommended I try this engine tuner spray before I bring it into him for repair. I the ordered the Johnson’s Engine Tuner off of Amazon, received it in a few days, followed the directions on the back of the can. Wow!! What a difference it made, I’ve never had this engine run this good. I will be giving this engine treatment on a yearly basis to both of my outboard motors.
John S.
2025-05-25 18:35:43
As always a great product. you spray this in your carburetor turned over a little bit without starting it. just so the system The product gets through the carberator system it will clean the carburetor. if it's full of dirt and debris you will probably have to clean the carburetor. but gum situations from letting it sit works phenomenal.
Jim Nohava
2025-05-13 15:19:42
Bgt a tiller with a trashed carb from bad gas, borrowed this from the neighbor gearhead. Dissolved and cleaned up the carb, bowl, float, .... bgt him a new full can
James Eubanks
2025-05-01 12:17:53
Used this after rebuilding carb on 20 horse Evinrude. Works well.
Sherm
2025-03-30 11:25:37
I had a discussion with an engineer that was on the design team at Evinrude in the 1980's. I had purchased a 1977 85HP Evinrude V4 and was talking to him about it. He told me it was a great engine and that the only real tuneup you needed was to run a can of this stuff through it. I ran the motor and sprayed the whole can into the intakes. Let it sit overnight. Changed the plugs. Started her right up the next morning she smoke white for a while and then after a good run purred like a kitten. No more sputters, just purrs. I'll be using this stuff every year to keep her running well.
kerry
2025-01-18 11:42:33
No two stroke was running a little rough and it was driving me insane! I replaced ALL the electronics to fix it! I mean every single electric component. It took me a few days! After I finished, the issue didn’t change. So I put this stuff in and like magic the issue was completely gone! I would have saved myself a lot of time and aggravation if I had remembered this stuff earlier. Don’t make the same mistake. Give it a try! Worked for me.
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