1969 inline 6 1250 merc

[langer]

i cant believe how hard this motor is to start... although when it finally does it really screams... i have a jet pump on it and an 18 foot flat bottom sled,
any thoughts on what is wrong and what i might do to fix any problams...
jonah

 

[Scaaty]

Re: 1969 inline 6 1250 merc

Hard cold starters..always were...if ya aint pushing gas out the carbs on a good primer bulb until hard, then primer buld needs a replace for starts..(ya shoving the cold start lever up..right?)

 

[MercFan]

Re: 1969 inline 6 1250 merc

Agreed with Scaaty. You havta dump a fuel station into the engine before you can get it to start. What I normally do is to trim down the engine from it's trailer position, but not very far. Probably between 45 and 60 degree angle with the horizontal. Then I start priming till I get fuel from the carbs. Then trim it down further, full choke, and start. Reason I prime while the engine is at an angle is that I can't get fuel dripping from the carbs when the engine is near vertical. The needles and seats just seal too well.

So yes, don't worry about flooding the engine. Give it lots and lots of gas. Some guys squirt syringes with fuel/oil premix into each carb before they attempt a start up. Don't use commercial aerosol quick start cans though. They don't contain any lubricants.

 

[langer]

Re: 1969 inline 6 1250 merc

ya i have a linkage relaease button to get up the throttle... i'll try pumping the bulb until gas comes out of the arbs.
thanks
jonah

 

[Scaaty]

Re: 1969 inline 6 1250 merc

Agreed with Scaaty. You havta dump a fuel station into the engine before you can get it to start. What I normally do is to trim down the engine from it's trailer position, but not very far. Probably between 45 and 60 degree angle with the horizontal. Then I start priming till I get fuel from the carbs. Then trim it down further, full choke, and start. Reason I prime while the engine is at an angle is that I can't get fuel dripping from the carbs when the engine is near vertical. The needles and seats just seal too well.

So yes, don't worry about flooding the engine. Give it lots and lots of gas. Some guys squirt syringes with fuel/oil premix into each carb before they attempt a start up. Don't use commercial aerosol quick start cans though. They don't contain any lubricants.

Good advise. I don't really know why hard cold starters, but I'm thinking something to do with the mess of lines and height on the motor, and the pumps gotta push the gas way up there after sitting and draining maybe..thats why you need a good quality primer bulb..I had one from Walmart, although it seemed to work, it was bypassing internally or something...new Tempo had it gushing

 

[MercFan]

Re: 1969 inline 6 1250 merc

I gave up on the bulbs and fitted a low pressure electric diaphram pump at the tank. My installation has quite a head it has to pump up to actually get to the carbs (2 maybe 3 feet vertical). So I just turn the key to "on" an listen to to the pump. When it goes quiet I feel the bulb for hardness and start-up.

The other problem is that all the fuel in the carbs and cylinders evaporate and only the 2 stroke oil is left behind. I think that also contributes to a hard first start.

 

[langer]

Re: 1969 inline 6 1250 merc

all's well, with the motor. thanks for all your help.
jonah

 

[Scaaty]

Re: 1969 inline 6 1250 merc

Good for you...!!..any more probs..post'em...