trigger on 1986 Merc 60hp

[newuserguy]

OK,
I have replaced the stator, trigger, rectifier, new water pump, fuel pump rebuilt and carbs rebuilt. Starts OK, However it has a serious, intermittent miss, and it is intermittent and not constant in any chronilogical sequence. It is not fuel related, stator checks out. I have been advised by a tech rep for Merc that if the trigger has any verticle movement (up and down play) it will give that kind of a miss. I pulled the flywheel and used my hand to move the trigger up and down. Yes, there is slight movement, However, I think that when the flyewheel is installed it would hold the trigger down so that it could not move vertically. Additionally, the trigger is 3 small coils fired by the hub magnet on the flywheel and I don't see why a very slight verticle movement would have any effect. Any ideas out there? Thanks for the help. Oh yes, the compression is great (140,140,138) with little leakdown loss and the plugs are new.

 

[Laddies]

Re: trigger on 1986 Merc 60hp

Your right about the movement thats not the problem. I am confused at you throwing all the parts at it, as you know they are very expencive you need to test the system. In loue of testing think how the system works, You have a stator with 2 windings and a trigger with 3 trigger windings, all windings are effected by heat but if one fails it seldom repair it's self unless it has a bad ground or output connection, have you check the connections? You have a switchbox that switches voltage to the cyls. to fire at the right second of time to fire the cyl. The switch box contanes rectifier switches (1 for each cyl.) which can stick and cause a cyl. to misfire at times and the transfomers (coils) one for each cyl. What do you think? You have eliminated the stator which if failed would have effected all the cyls. and the trigger which could have been tested with a OHM meter along with the stator. The transformers may also tested with a OHM meter. Granted the OHM test is not nearly as accurate as a DVA, but with the money you have spent for parts you could have purcased both meters and found the right part to replace. You are not the first or the last to have this experence and don't think I am picking on you I am not just flustered by your bad luck same as you. Bob

 

[newuserguy]

Re: trigger on 1986 Merc 60hp

Laddies,
Thanks for the reply. More info. I bought the motor from the original purchaser. When I got it it had corroded/burnt(?) wires from the stator to the rectifier and a bad wire on the trigger. I got a stator, trigger, prop and various oils, etc. from an out of business marina. I only spent $50.00 for all of the above plus 12 NEW sparkplugs and a new prop. OK, I replaced the stator and trigger, bought a new rectifier, carb kits, fuel pump kit and installed them. Fuel is now ok. It was a problem but the carb kits cured it (they were about $95.00 for two), I rebuilt the fuel pump as it was very inexpensive ($4.00) and replaced the rectifier just cause ($26.00). I have used a VOM on the stator and triggers. I cannot get the readings on the stator as my VOM doesn't go high enough in ohms, trigger reads OK. It starts fine runs fine but will not smooth out. Could the stator be causing a problem (it was not a new one)?

 

[Laddies]

Re: trigger on 1986 Merc 60hp

The reason that your VOM won't read the voltage is it's AC and you need a D-irect V-oltage A-dapter to read peak voltage. You got a H of a deal on the ignition parts, some one got you alittle on the carb parts. I would gamble that the switchbox is going bad-Bob

 

[newuserguy]

Re: trigger on 1986 Merc 60hp

Laddies,
I agree I got a H of a deal on the parts. For your info the carb kits on those carbs are over $50.00 each on iboats. I got them new at the cheapest price I could find and about 40% less than the discount marina stores. I was not checking voltage, I was checking resistance in Ohms for the stator and I couldn't get it to read high enough. On my unit when the resistance is to high it just shows 1. which indicates the resistance is higher than the VOM can read. I don't have a DVA but I am on ebay right now trying to locate a multimeter that has that feature or an add-on DVA. Can you advise me on what ?'s to ask so that I can obtain the right toool. Also, how do I check the direct voltage readings on the stator and switchbox. I am at wits end with this blankety-blank motor and have just purchased a Johnson75hp that runs like a champ. Thanks again for your help