The electrical(?) problem that just wont go away.

Mitchyboy561

Mitchyboy561

Location
Ontario Canada
Hey folks, bit of a story so bare with me.

Last spring i built my aquabot and it always had some type of hesitation, whether it be electrical or fuel. Tried everything under the sun with my carbs setup wise and would never completely get rid of the issue, even tried switching the carbs with my friends to see if my carbs were somehow bad, no dice. So i thought maybe it was electrical, tried switching out my enhancer with my stock cdi, nothing. Tried the coil, voila! thing roared to life and ran perfect! so i went ahead and put my msd back in and went to the lake the next day, back to running like chit! At this point im stumped, i replaced the stator as i added a plug to mine and maybe thought that was my problem, seemed to get a little better but no where near what it was. also tried a another new coil with no luck.

The problem is best described as electrical break down, i have it jetted now to try and compensate for it and its ride able but there's definitely more there. Im lost on what else it could be thats causing my problem, i also added a ground wire from the battery to the ebox.

So to recap, ive switched coils, stator, cdi, carbs. went over all connections in the ebox, tried disconnecting the s/s switch. all have no effect in getting it back to where it was before after the first coil switch.

hpe 819, stock charging system, msd enhancer, b pipe, a/m 44s

If anyone has any other ideas it would be greatly appreciated!
 
TheBuzzard

TheBuzzard

Location
the jetski grave yard
start the ski up in total darkness and look for the Xmas tree lights and if you don't think that's it, just grab the plug wires while its running and see if you get shocked. lol
the whole reasoning behind closing the gap on the plugs is so the spark will jump there instead of leaking out before the plug, to ground. fix the plug wire problem and there is no need to slam the gap shut
 
Mitchyboy561

Mitchyboy561

Location
Ontario Canada
Yea I've read that if you have a weak spark problem closing the gap might improve it, I'll try your shock method lol it's a new coil from ocd so I'd hope it's good

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Mitchyboy561

Mitchyboy561

Location
Ontario Canada
TheBuzzard said:
start the ski up in total darkness and look for the Xmas tree lights and if you don't think that's it, just grab the plug wires while its running and see if you get shocked. lol
the whole reasoning behind closing the gap on the plugs is so the spark will jump there instead of leaking out before the plug, to ground. fix the plug wire problem and there is no need to slam the gap shut
Click to expand...
No dice, no shock, Still sucking..

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TheBuzzard

TheBuzzard

Location
the jetski grave yard
its not the coil then.
you said you changed the coil and it ran great until you put the enhancer back in. did you take the enhancer back out and put the cdi that ran great back in? the enhancer has to be grounded thru the 2 bolts that mount it ,so the metal plate on the enhancer has to make a good ground thru the bolts that mount it. make sure its not rusty and making good contact.
 
Mitchyboy561

Mitchyboy561

Location
Ontario Canada
I did try swapping it back again with no success, my bolts are rusty but I never knew they grounded through the bolts, always assumed that's what the black wires are for...

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Harbor

Harbor

Location
Stockton
What's your jetting and pop off at, low and high screw settings, and when does it hesitate ? I see you changed carbs already so maybe nothing here.

I have reverse jetting and Iam rich on the low circuit, it rips as long as I don't let it load up. I notice the power isn't clean down low after slight idle to wide open like when jumping your set up wake. It's not a quite a gurgle but more of a rappid hesitation type feeling, not smooth clean power in other words. I can tune it in with the low adjuster, @1/2 turn out, but it won't idle on the stand and hesitates and won't hardly rev to clear the water box with the idle circuit this lean. Currently jetting the low circuit down and opening the low adjuster. Went 2 sizes down and at 1 out on the low screw and it's clean and idles.. dropped another 2 sizes and out 1.5 but have to try it..

My 49's work fine rev jetted and 1/2 out on the low screw, kinda weird
 
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Mitchyboy561

Mitchyboy561

Location
Ontario Canada
I'm at 125 low and 115 high I believe, 2.3ns with 20psi, gone all the way from 1.5 out to 1/4 in, gets better but still not the way it was, just doesn't seem like it's all there..

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Harbor

Harbor

Location
Stockton
I was 125L, 110H, 2.5 14 pop off 1/2 low 1 out high on a race gas, bored 1 over 701 and it's too rich as I described.

My buddies 819 Hpe has after market 44's, 100L 125H 1 out on both and it's pretty clean.. personally I think it should be jetted lower on the low circuit, but he doesn't have a speed plate and id have to do it, :(
he notices nothing so I'll leave well enough alone lol..

Right now Iam at 120L and 110 high 14 pop, 1 out on the low, 1 out high..
ran much better..... cleaned it up down low...

Now Iam at 115L 110H 14 pop off and 1.5 out on the L and 1 on the high.. have yet to try it, but Iam sure it will help... my goal is fir it to be clean down low and idle on stand correctly.

Your prolly to rich on the low circuit too, your higher jetted than the 819 here with aftermarket 44's..

If it's not clean down low like mine you might try dropping the low to 120 first, might need more still...

If dropping mine didn't help I was gonna ditch the reverse jetting..

If you have 4 transfer home 44's which the after market 44's do have, you could try normal jetting.. 100L 125h 14 pop off.. I'd try 95L too

What elivation are you at if any? That would of course affect these jetting numbers
 
Harbor

Harbor

Location
Stockton
You have'nt said when you feel it I don't think. Is it there when you first open the throttle to wide open like when trying to jump your wake or after a turn getting back in the throttle ? Or down low every time you accelerate ?
Is it clean once wide open ?

Matts jetting seems to be on the rich side, as maybe it should be on break in and to not burn an engine. Start rich and lean out from there.. I don't know what your experiencing but have seen similar sorta posts on the standard jetting.

Lean feels like a straight hesitation like getting punched in the gut or going into the bars sorta... rich gurgles and actually makes or sounds/feels like a gurgle.. feels not smooth down low and could be described as maybe a secondary ignition sorta issue, like maybe it's misfiring type of feeling since it's not smoothly accelerating, usually cleans up though seconds later.. like on mine if I thottle blip it constantly then hit it wide open then let off and get right back on it wide open it will be noticeably cleaner cleared out on that last pull....then next time be loaded up again

For some reason my ski dosnt really make the gurgle sound, not sure if it's the reverse jetting or my loud azz exhaust.. the 819 I'm a super jet with b-pipe and stock water box gurgled

I did have a broken water box baffle give fits years ago..

yes you could have something else going on. Just thought I'd share my experience with what Iam going thru
Carry on
 
Mitchyboy561

Mitchyboy561

Location
Ontario Canada
Yea I'd say it's pretty much everywhere in the rpm range, just doesn't seem like it's cleaned out.. I'm gonna try one of the setups you posted earlier and see how that goes.

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