Force 70 heavy start up

[Jiggz]

Re: Force 70 heavy start up

BTW, the pics show the most likely cause of the rings failing is they got caught with one of the exhaust ports. If you haven't done so, highly recommend chamfering all port holes (intakes and exhaust) before re-assembly. You can do this with a small file or better yet with a small grinder like a Dremel tool with a conical grinding stone. The critical chamferring is in the vertical portions of the port holes. It doesn't have to be a large chamfer maybe around 1/16.

 

[jerryjerry05]

Re: Force 70 heavy start up

After you hone the cylinders???
If you can still feel the grooves?
Your wasting $, it might last a while??
Might not?
How much seal was left on the gasket?
Maybe some sillycone to fill in the missing spots?

 

[joebart]

Re: Force 70 heavy start up

Thank you "Jiggz" for excellent tip about 1/4" rod. I was thinking that direction but you got it right to the point. Excellent. I will also still do some chamfering all port holes just on case. Gasket is in excellent condition, nothing is cracked or missing. Do I have to use some extra sealer on it? There is still some scratch but only 2-3 milimeters at the end of the cylinder. I dont think it will matter that much. Joseph

 

[Jiggz]

Re: Force 70 heavy start up

It's hard to make a call when you cannot actually feel the grooves. But the rule of thumb is if your fingernails catches, it needs to be honed until it doesn't. And then measure with boregage to order the right oversize piston and rings. But personally, I'll give it the best I can and instead of just throwing it away I can always give it a try. If the grooves are way above, they are not at least as worse if they are in the mid point.

 

[joebart]

Re: Force 70 heavy start up

1/4 ' rod, grease and freezer worked like a magic, had that done in a few minutes. Compression is 120 psi on all cylinders. Due to your help I have done something good. And I have done something bad too. I have striped the aluminium thread installing head back. Manual I have gives me power-head torque specification up top serial 093699 ( and mine is 06887) 225 in lbs. I had my torque wrench set at half of that and striped the thread anyway. All other bolts I have used some grease elbow and some common sense. What is the best solution for that?
Joseph

 

[joebart]

Re: Force 70 heavy start up

I have used some left thread with longer bolt. Later I will install heli coil fix. Toady I have tried to start the engine running on muffs. Strange but it did not start. Checked spark, sparking so it the fuel. No go, tried again, nothing... so used spray battle directly into carburetor and it fired for a few seconds. So that was a fuel... started again with no spray and wrrrrrrrrrrrrrrrrr. It started to start every-time without any problem. The motor seems to run quieter an smother then before but it smokes more since extra oil in the mix. Tomorrow I will take on a water to see how it works...... I will let you posted....

 

[joebart]

Re: Force 70 heavy start up

Is there any explanation why it did not start easy by itself first time before usage of fuel spray. It would be nice to understand it.....

 

[Jiggz]

Re: Force 70 heavy start up

The carbs may have not been primed with the fuel priming bulb properly. Indicating the carb bowls were either too low on fuel or even empty.

 

[joebart]

Re: Force 70 heavy start up

I took my boat on water yesterday, engine seemed to be working good, started and stopped with no complain whatsoever. I did not push it too hard. I have noticed to have some oil in the motor casing just below fuel pump. I am just wondering if that has something to do with fuel pump itself or it is some compression leak from the crankcase..