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You bet I can explain. The surging most commonly occurs between 2500 and 4000. It hasn’t surged at all above 4100 rpms and or under 1000rpms. Seems more prevalent when throttling down rather than throttling up. Each surge quickly increases the rpms by 400 then falls back to normal, by itself...

Well I took boat out again this evening. Trying to narrow down further. First ran from kicker tank to Racor with existing lines to outboard. This resulted in surging again. Then ran straight from kicker tank to outboard (same as earlier this morning). This time the surge was back. Albeit...

Old vs new. New gas slightly clearer. And slightly more “gas” smell...

I usually add a can of Seafoam to about every 80 gal or so. And I likely (can’t remember for 100% sure) added Stabil this past fall. For 10 years I have only used Yamalube 2 stroke oil. However, once this is remedied I’m converting to Pennzoil Xtended life.

Dennis- Do you mean run off the regular TANK either the cap off? The regular tank is a 5 yr old 86 gal aluminum tank with an always open vent hose. Curious whst would running wo the cap tell us? Yes, I have drained, smelled, observed the VST has multiple times. NEVER a drop of water. Looks...

I just ran around on the kicker tank for 1/2 hour. Trying all RPM ranges. Guess what? NO SURGING! Only a couple little hiccups near the end, which I’m attributing to grabbing air near the bottom of small gas tank. Holy cripes! Could this surging issue really be due to bad gas!? Early on I...

You’ve never used one Seasick? Seems like a lot of mixed reviews/opinions out there. Sure hate to waste money on this thing. Hopefully, I can find one to rent/borrow.

Thank you all. I’m going to try to find a Winky Blinky. I see Sims has them in stock. I was just hoping to save a few bucks and find a used one. ...$50 shipping, to AK, from Sims. I’m also gonna try to run fresh gas today. My throttle box is a 703. But I assume a similar process as Seasick...

I’m looking to buy or rent a Yamaha Winky Blinky diagntics light time use on my 2005 ox66 200hp. anyone have one they no longer use? I’m also curious if folks have had much luck with these correctly diagnosing their problems.

But I think your advice of trying to step back and diagnose 1 system at BBC a time is great. And that is what I am going to do. Starting with fresh gas from a kicker tank. BUT, 1 more question thought first. I was thinking about what you said about the throttle not opening the valves all the...

...the only parts that have been changed, since symptoms occurred, have been plug boots, O2 sensor, and LP fuel pumps. And I feel like I’ve trying to diagnose the problem for the past 3 weeks :) ...the VST is completely 100% clean in this case.

Is 3.75 v at WOT the normal?

Is there a chance this is symptomatic of a bad coil? If so, How could I test that m

You know I have been thinking the same thing about possibly bad gas. But i have drained the VST into a jar 4 times now. And it looks good to me, at least no water. And it were bad gas it seems like it would be surging at higher throttle too right? As far as the injectors, I sent them to...

Seasick, I appologize for the confusion. the reason for the multiple thread is just to make it easier for folks to chime in and not have to read the preceding novel. Guess, I made it more confusing in my attempt. Sorry, I feel like I am following advice and reporting back. Yes, youre right...

I just ran in the bucket again. Interesting that it didn't start doing the surging until after it warmed up, 10 min or so. also seemed interesting how oily the bucket water was after 15 minutes. Pic attached Is this an indication Im running way to rich? Checked the oil rod lingage and am...

ARG! Im struggling and really at a loss of where to go from here. Unfortunately, I live in a town only accessible by jet or ferry and dont have may options for outboard shops. The two Yamaha shops in town don't wanna take on my old 2 stroke problems, they're plenty busy with 4 stroke...

I did not decarb the engine prior to installing the new O2. I did not want to risk running the engine w an O2 sensor that I strong suspected (and seems like rightly) was bad. I guess I could (should) do this now? How long did it take for your computer to "learn" the system after your new O2?

Ok w my jury-rigged test harness I got 0.48 V fully closed throttle, 0.6V at idle, 4.45 V fully opened, and 3.75 V full throttle. To me these values all seem like they are within spec. except maybe the 3.75 at full throttle. Shouldn't this be closer to 5V? Could this possibly why im losing...

I have not checked the fuel regulator screen. Mainly because the one time I tried, it couldnt loosen the screws wo risk of stripping. AND I just dont think a that screen could be plugged as I have never had a dirty filter or screen in 10 yrs of ownership. this includes the injector baskets...