force 5 cyl 150hp

[rodeo]

can some one give me a witch way to go with the problem i am haveing just rebuild my 150 forc i picked up a used block honed it used same pistons put new rings the trouble is it dosent seam to be hitting on all 5 cyl all the time the compssion is 127Lb across the board could the problem be in the carbs or the fule pumps or some where else Thank's Garry????

 

[roscoe]

Re: force 5 cyl 150hp

If it is an intermitent miss, I would look to the ignition system. Check all sparkplug wires to verify you are getting spark. You could have a bad coil or two, which fail when they heat up. Or a bad switchbox.<br /><br />Stator creates dc voltage, trigger sends it to switchbox, switchbox sends it to coils, coils send it to the sparkplugs. <br /><br />Did you by chance put new plug wires on the motor?<br />They need to be solid wire core, not the polycarbonate automobile type.

 

[rodeo]

Re: force 5 cyl 150hp

Roscoe did not replace plug wires allthoe did ck spark on each coil good strong fire also put new sparkplugs in it and i have another complet 150 force and took the fly wheel stator,coil pack,ect and tryed it it did the same thing just dont under stand it it is such a simpal engin to build the resson i thout it might be in carbs or fule pumps becouse it has sit sents july 03 dident have time to build it then so it sit even thoe i did dran all the fule from carb bowels any other sugestions? thanks garry

 

[rodeo]

Re: force 5 cyl 150hp

roscoe when you talk about switchbox or you meaning the key ignition switch or somthing other then that thanks garry

 

[roscoe]

Re: force 5 cyl 150hp

Not talking about the key switch.<br /><br />The 1989 thru 1991A model 150 had the Prestolite ignition. The stator produces current and sends it to the "CD module" (power pack), you should have 3 of these.<br />Then the trigger sends a low voltage signal to the "CD module" which causes the module to send the stored energy to the coil.<br /><br />You could have a defective trigger, missing magnet on the flywheel, bad CD module, or just a bad wire. If you are going to test these parts, you are going to need a repair manual, as the testing procedures are beyond my scope of knowledge.<br /><br />The 1991"B" thru 1994 models (Thunderbolt ignition), replaced the 3 CD modules with a single switchbox.<br /><br />I hope this helps.

 

[dave in toledo]

Re: force 5 cyl 150hp

im rebuilding mine, too, sounds to me like the timing might be off???

 

[rodeo]

Re: force 5 cyl 150hp

Roscoe I understand what your saying about the triger,CD & coil pack but have another problem now ran the moter to day tinkering with it turned off egnition switch key yet moter keeps runing thought mabe bad switch went and bought new one but made no change when moter gets warm key will not kill moter so what would you sugest at this point,note I stil have the mis in the moter aswell.Thanks Garry

 

[roscoe]

Re: force 5 cyl 150hp

Black/yellow wires that connect to the "M" and "M" terminals on the key switch are supposed to connect and ground the ignition when the key is off. One of the wires may have a break or it may not be properly grounded at the motor end.<br /><br />A contributing factor may be the carb(s), not closing all the way and providing air/fuel flow to the engine.<br /><br />Snuff the motor to stop it, by putting rag or cardboard over the carbs. DO NOT pull the battery cable as this can/will blow the rectifier.

 

[WhiteHorse]

Re: force 5 cyl 150hp

It sounds like the harness has some connection issues at the powerhead end of things. Did you use the correct screws when reattaching the harness after poerhead reinstall? A harness wire screw that is in too deep will arc to the block behind the harness bracket. Also, check to make sure you did not crack the black plastic harnessing block. A crack from over-tightening will allow the short as well. <br /> As far as it not shutting off, etc. You may even have it hooked up incorrectly. Easy way to tell? Disconnect your ignition switch harness completely. Start the motor from the back using a jump gun with alligator clips. Both clips will be attached to the starter solenoid. One will go on the large terminal where the battery is connected. The other will go on the small terminal with the yellow start wire attached. <br /> Run it for a while without the harness attached at all. Jump up in the boat and go the gears, rev up, rev down, etc. Does it have the same problem? <br /> (You will need to manually choke the carbs to kill the motor.) Just take the black flash suppressors off before your test and then cover them with a folded towel when you are ready to kill her.

 

[rodeo]

Re: force 5 cyl 150hp

skye W H M took of the harness disconnected the black plastic block from the metal bracket and pulled all wires from it tape each wire seperet started engin with my remote ran her about 30 min stil no change It almost seems like its double fireing if thats posable I just cant think that it would be any thing eles but electrical by the way shes acting where do you think I should go to next step. and I want to say thanks to all yall out thear thats helping me find this crazy problem. Garry