rich-flanders18
Recruit
- Joined
- Sep 11, 2008
- Messages
- 4
Hi,
I have a mercury 1974 850 (85hp) thunderbolt ignition outboard. Its a complete pain to start when cold, fires 4/5 attempt and on really cold days many more attempts. As you can imagine im totally fed up now. My neighbours think the boat is call "start you bastard"! To rectify the problem i have done the following;
-New fuel lines and bulb
-carb strip and rebuild with new parts inc float set up.
-Full timing set up and sync.
-adjusted the choke butterflies.
-new fuel pump.
-full electrical check all good.
-compression is great on each cylinder.
Once she runs she is good for the rest of the day. except when the sea temp is <7'c and been off for an hour or more. Starting her that day after a fishing trip involved a few squirts of mixed fuel into the carbs, a prayer to the big man and getting everyone on board to shout "start you bastard" at the engine!...And she did thankfully!
That reminds me to mention, she starts first time with a shot of fuel in the carbs but is a nightmare to do when out on the water as you have to lay on the bathing platform with the blood rushing to your head and ive nearly lost the wrap around twice now!... plus the missus thinks its funny to shove ice in the back of your shorts while your busy getting the engine sorted!..Got to love her though!
Anyway i have been doing some more research on this and im finding that people have converted their engines with the same issues to primer solenoids instead of butterfly shutters with great success!!! I just cant find a DIY set of instructions for the conversion though. I think this will work with my motor as it starts no problems with a shot of gas into the carbs but struggles on the choke shutters.
Now the questions are....
1)Can this conversion be done with my motor?
2)what will i need?
3) How do i do it? and where would the fuel have to be injected/squirted into...? the mouth of the carbs or would i have to make away of getting the fuel directly into the manifold behind the butterflies in the carbs??
It would be nice just to turn the key and go with out any hassle or worries of will she get me home!
Thanks for reading my post and any help would be greatly appreciated!
Regards,
Richard
I have a mercury 1974 850 (85hp) thunderbolt ignition outboard. Its a complete pain to start when cold, fires 4/5 attempt and on really cold days many more attempts. As you can imagine im totally fed up now. My neighbours think the boat is call "start you bastard"! To rectify the problem i have done the following;
-New fuel lines and bulb
-carb strip and rebuild with new parts inc float set up.
-Full timing set up and sync.
-adjusted the choke butterflies.
-new fuel pump.
-full electrical check all good.
-compression is great on each cylinder.
Once she runs she is good for the rest of the day. except when the sea temp is <7'c and been off for an hour or more. Starting her that day after a fishing trip involved a few squirts of mixed fuel into the carbs, a prayer to the big man and getting everyone on board to shout "start you bastard" at the engine!...And she did thankfully!
That reminds me to mention, she starts first time with a shot of fuel in the carbs but is a nightmare to do when out on the water as you have to lay on the bathing platform with the blood rushing to your head and ive nearly lost the wrap around twice now!... plus the missus thinks its funny to shove ice in the back of your shorts while your busy getting the engine sorted!..Got to love her though!
Anyway i have been doing some more research on this and im finding that people have converted their engines with the same issues to primer solenoids instead of butterfly shutters with great success!!! I just cant find a DIY set of instructions for the conversion though. I think this will work with my motor as it starts no problems with a shot of gas into the carbs but struggles on the choke shutters.
Now the questions are....
1)Can this conversion be done with my motor?
2)what will i need?
3) How do i do it? and where would the fuel have to be injected/squirted into...? the mouth of the carbs or would i have to make away of getting the fuel directly into the manifold behind the butterflies in the carbs??
It would be nice just to turn the key and go with out any hassle or worries of will she get me home!
Thanks for reading my post and any help would be greatly appreciated!
Regards,
Richard