Hesitation on WOT despite float adjustements

[AlexeiVT]

Re: Hesitation on WOT despite float adjustements

Yes, as mentioned in an earlier thread on this post, I visually inspected the spark as I cranked the engine...and they seemed fine.<br /><br />Replacing the points and condensor...while it would certainly be a nice thing to do, there is a cost (I'm not concerned about the difficulty of it)...but given the holiday weekend, there is no real way to get parts before Tuesday when I head home.<br /><br />The boat started and ran great (except at WOT) on Friday...so what's really the chance that the points and condensor failed to the point where they don't generate enough of a spark, since the time the boat was pulled on Friday, and the following Saturday morning.<br /><br />Also, if the points and condensor were yielding a weak spark...then how come every time I spray fuel mix in, it readily fires each and every time I attempt it that way? (I know maybe since it's atomized finely it helps, but by the time I drop the spray bottle and pull the cord, it's basically droplets in the carb throat anyway)?<br /><br />I do appreciate the suggestion...just trying to figure out what the REAL problem is, before I go ahead and start replacing something that isn't really the source of the problem (as that was the suggestion I got a few weeks back when I experienced idling problems).<br /><br />I was all gung ho and ready to redo everything on the ignition system...but was told to inspect and troubleshoot...so that's what I did, and so far, those things checked out ok.<br /><br />I checked the spark several times today, just to be certain that they were jumping blue, and they always were.<br /><br />Like I said before...maybe it's just a series of inopportune coincidences...but before I know it, I'll have spent $100's of $'s, and still manage to address the root cause.<br /><br />All I need the carb to do, is replicate what I achieve w/ the spray bottle, and it'll run...just can't see how replacing what look to be visually OK modern coils, and freshened up points, would help...all 4 couldn't possibly just go from OK to shot in one day of running fine, could they?<br /><br />Time to save up for a replacement I think...since there is nothing to plug the carb anywhere at this point.<br /><br />I'm figuring I understand how the carb is suposed to work, but it's not doing things the way it did the other day...just changed while sitting there I guess (and no caterpillars, or spiders in the mix...checked for that).

 

[djzyla1980]

Re: Hesitation on WOT despite float adjustements

You replaced the fuel lines... which would include the bulb... is the primer bulb goin the right direction?<br /><br />If you can spray premix into the carbs and it fires you have a fuel delivery problem .<br /><br />Disconnect the fuel line going to the carb, press the primer a couple of times, make sure fuel comes out of the hose. For some reason it is not getting any fuel . Have you looked at the quick connect on the motor? <br /><br />If you find theres something goin on with the fuel lines, after just replacing them, I would swap the old primer bulb with the new one. The check valves can be a pain and get stuck. <br /><br />If you don't find the answer in the fuel line then check the float needle on the carb. If theres a drain screw then take it out. Prime the bulb many times. Make sure you get fuel out of the drain. Should be in connection with primming (push primer get fuel etc...) If you get none the float/ needle assy. may be stuck closed. Try tapping on the carb body with a screwdriver handle. If that don't work pull the bowl and see whats up. <br /><br />You adjusted the float, but when adjusting did you push up on the float with needle intact? Doing this is a good way to get a stuck needle. Best way is to take the needle out/adjust/replace needle/ and check for proper fit. <br /><br />Keep us posted...

 

[AlexeiVT]

Re: Hesitation on WOT despite float adjustements

I've checked all that already, and it all ckecks out OK...the gas gets into the carb, no problem...it's why it isn't moving through it, despite scrupulously cleaning it, that baffles me.<br /><br />The primer bulb/line I did not replace, since it is fairly new and works fine (the lines that come off the carb, to the fuel pump and filter, were the ones replaced).<br /><br />When I disconnect the fuel hose from the carb, and squeeze the bulb, I can shoot fuel a few feet, so there's nothing plugging anything to that point, for sure.<br /><br />There is always a FULL carb fuel bowl, every time, so I know there is no fuel delivery problem through that part of the carb...each time I removed the carb, I first drain that bowl, which is always full...then after reinstalling, prime the bulb, and can listen to the bowl fill up just fine.<br /><br />I adjusted the float by removing it and bending the tab, for worry of damaging the seat...plus, each time before screwing the bowl assembly back on, I visually check to see that the needle drops and moves freely.<br /><br />Since it's a new day...I'm up for a NEW approach, and any suggestions, since this is it for me.<br /><br />The passages in the carb are clear, so I just can't tell why it's not doing what it's supposed to...I wich I had access to another carb to swap on and see what happens, as that would answer some questions, but I don't...and even so, still wouldn't explain why this one just stopped functioning overnight.<br /><br />I've heeded the advice, checked things thrice...but now, no dice.

 

[AlexeiVT]

Re: Hesitation on WOT despite float adjustements

Eureka!<br /><br />I give you permission to call me a fool...I'll be the one on the pond today, wearing a dunce cap (but at least I'll be boating).<br /><br />After realizing that things had been cleaned, and that the motor fired every time w/ the spray mix, it dawned on me that the fuel I was spraying, I poured from a much older, but sealed container (my spare 1 gallon reserve).<br /><br />Checked the fuel filter this morning, and it was obvious that there was water and fuel seperation in 2 distinct layers (didn't readily show up when primed, since the agitation going through the hose seemed to homogenize things).<br /><br />Go figure...2 identical full tanks of gas, 2 weeks old, stored right next to eachother in the same manner, and the boat all covered up...and one either absorbed or allowed moisture in.<br /><br />And again, those coincidences...fuel level must have been dropping, and water getting sucked in, which seems at this point to be the most plausible explanation for the surging at WOT, as the tank got jossled or changed angles...who knows, it runs fine now...figure a new fuel pump only hurts the wallet, not the boat (mind you, this gas was the pre $3.40 / gallon...back in the good old day...of August!).<br /><br />Apparently, there were torrential rains here last week, so there's an explanation...<br /><br />Thanks again for all the help, certainly learned about troubleshooting, and again it was the obvious...that just happened to run down fuel in the tank to the point of not being able to be used, at the moment it last ran.<br /><br />Things run better than ever...and I can at least rebuild this carb w/ my eyes closed...now I don't have to scuddle, and can save up for the other long list of fixes.

 

[djzyla1980]

Re: Hesitation on WOT despite float adjustements

Glad to hear it's going... Like your's mine ran excellent yesterday after a few changes.... Maybe it's just the time of year. <br /><br />Look for the obvious and prepare for the worst

 

[AlexeiVT]

Re: Hesitation on WOT despite float adjustements

Finally had a bit of fun...<br /><br />Only downside, after all the effort, my girlfriend got sick while being towed in the tube, and there went my co-pilot, so I never got my turn in the water.<br /><br />Then, finally went out for one last trip before sunset...just as I turned around and headed back, I SPUN my supposedly new prop (should've known better from the eBay purchase, and the oversprayed paint on the bushing)...I guess it never ends.<br /><br />I stuck my beat up one to see how things would go, and it didn't vibrate like before (I'm assuming because the motor runs better).<br /><br />So is there a fix to rebonding a spun prop? I was thinking to remove and freeze the rubber bushing, and warm the prop, and press fit them together w/ epoxy (either that, or just put a pin through both).<br /><br />The other thing that surprised me...is that w/ my old prop, I pressed out the bushing (because I was going to purchase a prop w/ a different mounting, and wanted to see if I could swap out the innermost metal sleeve of the prop setup that goes on the stainless prop shaft). Getting it togther was a bear...I ended up using grease, and munched it a bit. But, strangely enough...(knowing grease shouldn't be used, since that would make it more likely to slip)...that prop didn't slip...maybe just a matter of time before it does...but till whenever, this is good enough for now (alot easier to haul a prop than a motor, back home).

 

[Solittle]

Re: Hesitation on WOT despite float adjustements

A spun prop must be rehubbbed by a prop shop. This is not a do-it-yourselfer repair.