vinnybugs Posted June 8, 2021 Report Share Posted June 8, 2021 OK guys i need opinions as to where do i go now engine surges Cleaned carbs new primer bulb new separator new fuel hose from separator to motor new fuel pump new filter only happens sometimes. when its not happening engine runs great yamaha 115 2 stroke 2004 Thanks Quote Link to comment Share on other sites More sharing options...
SouthernWake Posted June 8, 2021 Report Share Posted June 8, 2021 Describe “dead spot” good idea to attack the fuel side first. 1 Quote Link to comment Share on other sites More sharing options...
vinnybugs Posted June 8, 2021 Author Report Share Posted June 8, 2021 after fishing a spot for 30 minutes, give it throttle and wont take off like it should.( sluggish ) back off throttle and goes like hell. didnt happen until end of day. got on plane fine in the am. dont know where else to look. Yamaha 115 2 stroke 2004 thanks Quote Link to comment Share on other sites More sharing options...
RacerxV6 Posted June 9, 2021 Report Share Posted June 9, 2021 I would get an exterior tank and run it and see how it reacts by bypassing the fuel cell in the floor. 3 Quote Link to comment Share on other sites More sharing options...
HoneyB Posted June 9, 2021 Report Share Posted June 9, 2021 Is the filter water separating filter? take the fitting off the motor end of the fuel line and pump some gas into a glass jar… verify gas in tank is good. 1 Quote Link to comment Share on other sites More sharing options...
geeviam Posted June 9, 2021 Report Share Posted June 9, 2021 Could be a sticky anti-siphon valve on the fuel tank. When I took one off my tank to check it out, a while back, I may have accidentally punched out the ball and sleeve . Just for the heck of it, I reinstalled it as it was. The motor never ran better. Installed a manual fuel cutoff ball valve 8" down on the fuel line for safety, until a new ASV could be installed. 1 Quote Link to comment Share on other sites More sharing options...
vinnybugs Posted June 9, 2021 Author Report Share Posted June 9, 2021 yes fuel water separator. gas is clear is the anti siphon you r talking about the pick up tube in the tank? I wil try the portable tank and see what happens thanks for the help Quote Link to comment Share on other sites More sharing options...
HoneyB Posted June 9, 2021 Report Share Posted June 9, 2021 Might as well buy 4 new plugs. It’s a cheap way to rule them out Quote Link to comment Share on other sites More sharing options...
geeviam Posted June 9, 2021 Report Share Posted June 9, 2021 2 hours ago, vinnybugs said: is the anti siphon you r talking about the pick up tube in the tank? It's the fitting on top of the tank that the fuel hose (supply line to the motor) connects to. It's made with dissimilar metals (aluminum, stainless ball, spring and sleeve), so it's prone to corrosion in a salt water environment. Looks like this: Quote Link to comment Share on other sites More sharing options...
vinnybugs Posted June 9, 2021 Author Report Share Posted June 9, 2021 thank u gonna do it on sat Quote Link to comment Share on other sites More sharing options...
SouthernWake Posted June 9, 2021 Report Share Posted June 9, 2021 22 hours ago, RacerxV6 said: I would get an exterior tank and run it and see how it reacts by bypassing the fuel cell in the floor. This is my recommendation as well, put known clean/good gas in the portable tank and run direct to engine bypassing all external fuel systems. Quote Link to comment Share on other sites More sharing options...
vinnybugs Posted June 9, 2021 Author Report Share Posted June 9, 2021 will do also gonna change out anti siphon. Boat is a 2004 maverick MA so cant hurt to change. will let u all know thanks Quote Link to comment Share on other sites More sharing options...
whichwaysup Posted June 10, 2021 Report Share Posted June 10, 2021 14 hours ago, vinnybugs said: will do also gonna change out anti siphon. Boat is a 2004 maverick MA so cant hurt to change. will let u all know thanks Well how bout a pic of her!! 1 Quote Link to comment Share on other sites More sharing options...
vinnybugs Posted June 10, 2021 Author Report Share Posted June 10, 2021 its in photo section Quote Link to comment Share on other sites More sharing options...
Wanaflatsfish Posted June 13, 2021 Report Share Posted June 13, 2021 On 6/9/2021 at 7:36 PM, vinnybugs said: also gonna change out anti siphon. Boat is a 2004 maverick MA so cant hurt to change. uggh......if it's never been changed... it could be your problem....they get super gunked up over time. dc 1 Quote Link to comment Share on other sites More sharing options...
vinnybugs Posted June 19, 2021 Author Report Share Posted June 19, 2021 Ok guys upsate on this surging thingy Changed anti siphon. old one was nice and clean Well got the tech here and went for a ride with remote tank. Same issue Check everything on motor, spark coil and whatever else he did. No good When he took off plugs they read b8hs10. Well this motor calls for brhs810. Didnt have plugs with me so thats next. He feels thats the problem. We had already did the carbs. Will keep u all informed Motor yam 115 2 stroke 2004 1 Quote Link to comment Share on other sites More sharing options...
HoneyB Posted June 20, 2021 Report Share Posted June 20, 2021 On 6/8/2021 at 11:18 PM, HoneyB said:out Hopefully the plugs will do it for you Quote Link to comment Share on other sites More sharing options...
RacerxV6 Posted June 21, 2021 Report Share Posted June 21, 2021 At least you ruled out tank and everything in the boat. so now you can concentrate on the motor. Hopefully it's the plugs. Quote Link to comment Share on other sites More sharing options...
vinnybugs Posted June 24, 2021 Author Report Share Posted June 24, 2021 Ok Guys Correct plugs in. Ran it today and little hicup first hole shot than ran like a bullet for 45 minutes. Let it sit for 10 minutes and it surged again but i pushed choke and it caught up and ran great. NOW WHAT? Leave it and go fishing??? lol Thanks Quote Link to comment Share on other sites More sharing options...
HoneyB Posted June 24, 2021 Report Share Posted June 24, 2021 If your going to run it and hope it gets better run seafoam through with a 6 gallon remote tank. It might clean it up. Sounds like your loading up with fuel while at idle. And I know you say the carbs are good because your guy was just in them. But one little piece of trash in a jet or a float not sealing off is all it takes to create issue Quote Link to comment Share on other sites More sharing options...
BradM Posted June 24, 2021 Report Share Posted June 24, 2021 Are the gaskets/boots from the carbs to the block fresh? Sounds like you're sucking air (lean) after the engine is cycled then cools some. The heat cycle could be opening the leak. Next time you run for a bit then shut it off, fire it back up with the cowling off and spray some starting fluid around the boots and gaskets, if the engine idle speeds up, you've found the issue. Please don't try to drown if with that stuff, a little vapor off it will do. If it's not that, it's a low speed circuit issue...vent on the carb clogged, vent tube pinched off, trash in the needle/seat, low speed jets or something along those lines. I'd check out the simple stuff before I pulled the carbs back off. Good luck! 2 Quote Link to comment Share on other sites More sharing options...
vinnybugs Posted June 25, 2021 Author Report Share Posted June 25, 2021 honey B wht do u mean loading up at idle? im not good at this stuff please explain THanks Quote Link to comment Share on other sites More sharing options...
vinnybugs Posted June 25, 2021 Author Report Share Posted June 25, 2021 Brad wht do u mean boots? Are you talking about where carbs attach to block? Thanks 1 Quote Link to comment Share on other sites More sharing options...
lurem Posted June 26, 2021 Report Share Posted June 26, 2021 What about the black box (CDI ignition)? I had a similiar problem on my 90 2 stroke and it drove me crazy. It was intermittent like you described and impossible to find. I had a friend who had the same motor and we swapped coils, carbs, etc (yes, he was a good friend) and finally the box and it ran fine. I located one on ebay and problem solved. They are expensive so I would try to borrow one first. This is just a guess but you seem to have tried almost everything else. 1 Quote Link to comment Share on other sites More sharing options...
Sandman6927 Posted June 26, 2021 Report Share Posted June 26, 2021 I maybe wrong but you might check the electronic choke. I had a Yamaha that the automatic choke would stick . Quote Link to comment Share on other sites More sharing options...
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