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It just Quit! suggestions please
http://mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=69475		 Page 1 of 1
Author:  swamprooter [ Mon Jan 09, 2017 12:01 pm ]
Post subject:  It just Quit! suggestions please
I have a 36 hp Prodrive with less than 150 hours however it was made first year they came out but kept in top shape. Yesterday i was in the river and clipping along around 4000-4100 rpms looking for ducks. Motor just quit! might have sounded like a small back fire. But i got to bank and tied up and could not get it cranked. motor would turn over and over over but never hit or fire Here is where i stand. Any suggestions on what i need to check please. thanks

1. Emergency Cut off safety clip in place
2. plenty of gas
3. fuel pump sucking
4. fuel filter clean
5. can pump bulb and fill filter full of gas
Author:  Will C [ Mon Jan 09, 2017 12:24 pm ]
Post subject:  Re: It just Quit! suggestions please
First verify that you are getting spark. Its common for the diode on coils to fail or the ground wire to coils to be grounded. Second there is a fuel shutoff solenoid on bottom of your carb. There is a small connector at solenoid and another connection a few inches above the solenoid. Both of these are common fail points. Check this stuff then report back
Author:  swamprooter [ Mon Jan 09, 2017 1:42 pm ]
Post subject:  Re: It just Quit! suggestions please
Will do thanks! i am just an old plywood salesman but hope i can fix before saturday. May rule out carb since i had Boat Doc do a phase 1 on it last summer.
Author:  Russ [ Mon Jan 09, 2017 2:33 pm ]
Post subject:  Re: It just Quit! suggestions please
The solenoid itself can die as well.
Author:  swamprooter [ Mon Jan 09, 2017 2:44 pm ]
Post subject:  Re: It just Quit! suggestions please
so i need to establish Fire or no Fire to plug.

1.If getting fire by pulling plug and checking for fire when i ground plug to metal, then it might be a Kill switch issue or????

2. If not getting fire to plug then it could be
a. bad coil
b. solenoid
c. burnt diode
d.??
Author:  riverrambler [ Mon Jan 09, 2017 2:54 pm ]
Post subject:  Re: It just Quit! suggestions please
when you say boat doc installed phase one does that mean a single carb kit?
Author:  tlsmith22 [ Mon Jan 09, 2017 7:57 pm ]
Post subject:  Re: It just Quit! suggestions please
Check ur kill switch. This has happened twice to me. Bet the contacts are open.
Author:  DENNYEDWARDS [ Mon Jan 09, 2017 9:42 pm ]
Post subject:  Re: It just Quit! suggestions please
Check oil pressure sensor, might of went bad.
Author:  swamprooter [ Tue Jan 10, 2017 2:57 pm ]
Post subject:  Re: It just Quit! suggestions please
Checked last night and getting fire to the plug
so...
1. check gas pump?
2.?
Author:  Will C [ Tue Jan 10, 2017 3:37 pm ]
Post subject:  Re: It just Quit! suggestions please
Check for power and ground at above mentioned fuel shutoff solenoid. You should also be able to hear it click when key is turned on
Author:  swamprooter [ Fri Jan 13, 2017 2:39 pm ]
Post subject:  Re: It just Quit! suggestions please
hey Guys, thank for the help and suggestions. What i thought was a spark wasnt!! basically no fire to the plugs until i pulled black wire ( emergency cutoff) to coil.. Then check plug and it was firing away. I then order a wiring harness from PD and will replace..

last question.....to take cover off...do i have to take the 3 bolts out also that hold the screen on the engine cover? if so what size is that * star bolt? thanks
Author:  MaXXis85 [ Mon Jan 16, 2017 7:20 am ]
Post subject:  Re: It just Quit! suggestions please
T30 IIRC. and while you have it off, Cut the long studs that the screen threaded into. Cut then about the length of a bolt head and toss the grass screen bolts in the garbage. I zip tie the scree to the metal shroud and it keep trash from getting into the fan on a PD.
Author:  swamprooter [ Wed Jan 18, 2017 2:30 pm ]
Post subject:  Re: It just Quit! suggestions please
Got a new harness in from PD however after my stage one, plug was cut out so it is direct wired with no female or male. Ran into Briggs dealer rep accidently in Briggs store and he said it was not my diodes!. i am all screwed up now :) all i know is if i unplug black wire to back of coil, the plug will fire. questions. anyhelp much appreciated

1. Can i take new wiring harness and cut Diodes out and cut out old diodes and wire new ones back in with electrical tape, etc?

2. If replacing diodes doesnt work, is it saftety switch?

thanks
Author:  Will C [ Wed Jan 18, 2017 10:34 pm ]
Post subject:  Re: It just Quit! suggestions please
The wire you are disconnecting is the kill/ ground wire. Do you have a volt meter or test light? That wire must be grounded and turning the coils off. Either the wire is shorted out somewhere, kill switch shorted, oil pressure swich grounded...
Author:  riverrambler [ Thu Jan 19, 2017 6:51 am ]
Post subject:  Re: It just Quit! suggestions please
does this motor have single carb since you say boat doc installed phase one does his phase one consist of a carb? if so is it non cdi and does it have an external rev limiter? i have seen wiring harness issues were external rev limiter was not getting 12 volt which in turn grounds coils and would not let motor run fire. just a thought you may not even have one thought i would throw it out there.
Author:  swamprooter [ Thu Jan 19, 2017 7:54 am ]
Post subject:  Re: It just Quit! suggestions please
Hey guys thanks for the help and patience with me, I pull wires off back of coil and turned the key . BAM. It roared like a loin and scared the crap out of me it started so fast. So I have a new harness from PD so I am either going to splice diodes in or wire it back to original plug PD had it. Amazing a little diode as a big as a pencil eraser can shut you down at any moment. But been a great learning experience on how and what to check. Just looking at the diode I think I can preform diode surgery and fit new in wiring of the old instead of replacing whole harness. Anyone ever do this?

RRambler . It's a single carb but it does have rev limiter which you bring up a great point. Can the rev limiter burn The diodes out? Motor has less than 4 hours with rev limiter. But I have owned motor for 10 years and burned last diode the day I got it 10 years ago!! wondwr if I should disconnect rev limiter
Author:  riverrambler [ Thu Jan 19, 2017 9:33 am ]
Post subject:  Re: It just Quit! suggestions please
What the diodes do is beyond my knowledge. i just know non cdi has them and cdi motors i have worked on never had them. as far as rev limiter burning them up i have no idea either. i have had 3 non cdi motors with external rev limiters and never had a diode problem. and i would not disconnect the rev limiter and put it on the water but you could disconnect it to check and see if it will run with it disconnected
Author:  cb5331 [ Thu Jan 19, 2017 9:49 am ]
Post subject:  Re: It just Quit! suggestions please
If there was an issue with the rev limiter, it could certainly damage the diodes. They have a wattage rating and, if overpowered, they will fail. I believe the ones on the briggs are only like a 3watt version so it doesn't take much power/current to toast them.

They are there to keep weird power surges from the coils from backfeeding into the ignition circuit. They won't allow (+) to come out of the coil, but will allow the (-) from the kill circuit through to the coil to shut it down. Kinda like a flood gate for power. Only allows current to flow in one direction.

Also, YES, you can just replace the diodes. They cost pennies. If you already bought the new wire harness, you can cut the diodes out of the new harness and splice them in to the old. (Make sure they are facing the correct direction. They only work one way) In the future, you can buy diodes all by themselves and fix the entire problem for less than a dollar.
Author:  Russ [ Sat Jan 21, 2017 2:51 pm ]
Post subject:  Re: It just Quit! suggestions please
It was the Rev limiter. Damn gremlins.
Author:  brycecheramie [ Sat Jan 21, 2017 2:54 pm ]
Post subject:  Re: It just Quit! suggestions please
Author:  cb5331 [ Sat Jan 21, 2017 3:48 pm ]
Post subject:  Re: It just Quit! suggestions please
My rev limiter works great. 8k rpms? Meh....hammer down.
Author:  swamprooter [ Sat Jan 21, 2017 5:47 pm ]
Post subject:  Re: It just Quit! suggestions please
:D big thanks to Russ this afternoon holding my hand!!! Well at least my diodes are new! So. NOw that I have discontinued my rev limiter, I just need to watch my rpms now. Correct?
Author:  cb5331 [ Sat Jan 21, 2017 5:54 pm ]
Post subject:  Re: It just Quit! suggestions please
Yes, and be very careful who you let drive your boat. It's real easy to over rev when skipping across a sand bar or mud flat, when trying to dig out of a situation, and when trimmed way up running through stump fields.
Author:  swamprooter [ Mon Jan 23, 2017 12:51 pm ]
Post subject:  Re: It just Quit! suggestions please
Contemplating replaciing REV Limiter however i dont run nearly as hard or often as most of yall do. 90% of my use is climbing over logs in the Mississippi River to get back in willows to duck hunt .

How much a rev limiter cost?
Author:  Will C [ Mon Jan 23, 2017 2:36 pm ]
Post subject:  Re: It just Quit! suggestions please
I think around 200 from bps
Author:  ibfishinb [ Mon Jan 23, 2017 3:45 pm ]
Post subject:  Re: It just Quit! suggestions please
I would replace it. It is cheap insurance.

Sent from my SM-G920V using Tapatalk
Author:  MaXXis85 [ Thu Jan 26, 2017 7:51 am ]
Post subject:  Re: It just Quit! suggestions please
Don't need no stinking rev limiter!
Author:  CypressCritter [ Thu Jan 26, 2017 10:08 am ]
Post subject:  Re: It just Quit! suggestions please
Dumb Ass question on this rev limiter thing. Would cdi coils work on his motor? seems new 4750 rpm coils thru amazon are around $70-80 each.
Author:  cb5331 [ Thu Jan 26, 2017 10:17 am ]
Post subject:  Re: It just Quit! suggestions please
He'd have to change the flywheel or have his broached. The timing is different.
Author:  MaXXis85 [ Thu Jan 26, 2017 11:39 am ]
Post subject:  Re: It just Quit! suggestions please
Author:  MaXXis85 [ Thu Jan 26, 2017 11:39 am ]
Post subject:  Re: It just Quit! suggestions please
Author:  CypressCritter [ Thu Jan 26, 2017 11:44 am ]
Post subject:  Re: It just Quit! suggestions please
so a cdi can be converted to non cdi also?
Author:  cb5331 [ Thu Jan 26, 2017 11:49 am ]
Post subject:  Re: It just Quit! suggestions please
Yep
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