'80 Mercury 40 T-bolt, turnover/no start-update

terrybb

Cadet
Joined
Aug 25, 2010
Messages
8
Okay, originally posted on 8/25/10 a "turn over-no start" problem with my motor.
Still have same problem, but have followed the advice/suggestions given to me.
Motor is a 1980 Mercury 40 T-bolt (2 cyl./2 stroke w/elec. start, ser.#5750894)
Original issue before the turn over-no start problem was motor was hard to start and would die at idle (mostly after motor had been running awhile, 15-30 minute run time approx.). Otherwise, motor ran great, good power, good & steady stream from pee hole. After an outing on the water couple weeks ago, got boat home and when I went to flush with dog ears, could not get motor to start and haven't been able to since then. Here's what I have done so far:
1. Replaced all fuel lines & primer bulb.
2. Serviced fuel pump by replacing the two check valve gaskets, diaphragm, and both gaskets that accompany that. Also, cleaned pump itself. After reinstalling pump, checked for flow from pump via cranking motor.
3. Pulled carb, inspected, cleaned (via overnight soak & compressed air), replaced various gaskets/seals, etc. that came with carb repair kit.
4. Replaced spark plugs (NGK p/n BUZHW as recommend by parts guy at Boathouse Dis. Marine here in Melbourne, Fla.).
5. Replaced the already fresh fuel with more fresh fuel, mixed 50:1. Also, cleaned/inspect tank & all its components.

Fuel is getting to carb, but still, no start. Ignition/spark problem may be an issue, checked spark from old plugs (champ. L76V's) and it did'nt seem too strong (color was blueish-yellow & seemed weak). However, with new NGK's, there is now no noticable spark. Could battery strength be a factor with this? With all of the trying to crank the motor, battery was getting weak, got it on a deep cycle charge right now. So...anymore suggestions/advice from anyone would be appreciated! Sorry this was long-winded, just trying to provide detailed info. One more thing, on the control, there is a toggle type switch, what is that for? Is it the kill switch, if not, is my motor equipped with that, and what exactly is a kill switch?
 
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