Simple Carb question,,,I hope!

[OLJOCLARK]

Hello folks,,Cadet Clark here.Still tryin to figure out my stalling problem on my 1978 70 hp Johnson.I tried something I saw someone do once trying to check out carbs.I cupped my hand over each carb one at a time while running the motor on water ears.The top 2 stalled the motor down to stop, but with the bottom carb cupped off the motor would stay running.Any Ideas ? Thanks, in advance.OLJOCLARK

 

[Daviet]

Re: Simple Carb question,,,I hope!

How is the compression and spark on the bottom cylinder?
It may be time to overhaul the carb.

 

[OLJOCLARK]

Re: Simple Carb question,,,I hope!

The compressions on all 3 are 110 .I'm soaking the carb tonight.I had already cleaned them several times and replaced needle valves and seats,Floats are good and level.thanks for your reply.Just wondering what I haven't done right.I know I haven't been able to get a wire in to all three small holes yet. Gonna try that tommorow after work.I haven"t soaked them until now. Thanks

 

[OLJOCLARK]

Re: Simple Carb question,,,I hope!

Oh yeah,,I've got a spark tester and I'm getting great spark on all 3 with about 7/16 gap a strong looking spark.Is it possible to have too small gap on the plugs?

 

[OLJOCLARK]

Re: Simple Carb question,,,I hope!

Update. I found the inner round gasket in the bottom carb to be cracked.I replaced it and cleaned carb again.Now I get get the same response from all 3 carbs.Gonna give it a try in a few days on the water. I'll update then. Oljoclark

 

[OLJOCLARK]

Re: Simple Carb question,,,I hope!

Oljo here again.Still no better! Today I decided to take the coil wires loose and Ohm em.2 coils read right at 2 ohms,1 coil reads .963 and is leaking the black stuff.I'll be trying a new coil next and will post the results.

 

[Rscardina]

Re: Simple Carb question,,,I hope!

any coil leaking anything isnt good,,, replace it..

if thats all you found on the carb side then a coils is first and see what she does.

Good luck

 

[OLJOCLARK]

Re: Simple Carb question,,,I hope!

Thanks.I ordered the coil yesterday.It'll probably be friday or saturday before I can run it.That is if the part comes in as quick as it usually does from Iboats.I'll post as soon as I know something.I like to see a good ending on these post's.Maybe we'll have one this time.OLJOCLARK

 

[OLJOCLARK]

Re: Simple Carb question,,,I hope!

OK! For anyone keeping up with this story,still no better.I probably needed the coil anyway but still not the answer.This week I pulled the exhaust manifold covers and found the inner gasket to be bad.Water sitting inside the exhaust port on the middle cylinder.I've ordered the gaskets.I broke off 3 cover bolts in the process soI've got plenty to do until the parts arrive! I'll post the results in about a week,I hope I've found the gremlin this time.Wish me luck.,,,,Oljo from Alabam

 

[OLJOCLARK]

Re: Simple Carb question,,,I hope!

Yesterday I proceeded to drill and try to extract the 3 broken bolts in the block. No luck these things aren't moving.I was trying to turn one out and the block cracked!End of story,Parts motor for sale! Oljoclark

 

[OLJOCLARK]

Re: Simple Carb question,,,I hope!

Yesterday I proceeded to drill and try to extract the broken bolts in the block.Not coming right out. As I was trying to turn one out the block cracked!.Parts motor for sale!I'm sure I had finally found my gremlin.Gonna move over to the Mercury forums for my next project.You dont know a good welder do you? Oljo out

 

[patrick4266]

Re: Simple Carb question,,,I hope!

Sorry to hear you messed up your motor but maybe it can still be fixed.