1997 115, bogging down

[ian hendo]

Hi Brains Trust, engine starts ok and runs at first ok, when I stop and turn off motor or even just idle I have problems accelerating again. Seems to bog down and splutter. If I give more gas it stalls.
Although if I slowly gas it up it, it splutters and coughs then finally runs ok and will run fine at higher rebs. Until I return to idle when it does the same again. Fuel delivery?? Thank you for any suggestions

 

[racerone]

How did this motor run for you last season ?----There are 2 different 115 HP model in 1997.----Post the model #----Post results of a compression test.

 

[ian hendo]

How did this motor run for you last season ?----There are 2 different 115 HP model in 1997.----Post the model #----Post results of a compression test.

hj115sleua, only had it for 4 months. Issue started as a one off, and happens more and more often. I have new coils and plugs fitted. Engine has been serviced.
Compression Test
Cyl 1:115 Cyl 2:115
Cyl 3:115 Cyl 4:115

 

[ian hendo]

hj115sleua, only had it for 4 months. Issue started as a one off, and happens more and more often. I have new coils and plugs fitted. Engine has been serviced.
Compression Test
Cyl 1:115 Cyl 2:115
Cyl 3:115 Cyl 4:115

Compression test is from Oct

 

[racerone]

Does spark jump a gap of 3/8" on all leads ?----Perhaps test run with a different tank and hose.----Did you install a new water pump impeller 4 months ago ?

 

[ian hendo]

Does spark jump a gap of 3/8" on all leads ?----Perhaps test run with a different tank and hose.----Did you install a new water pump impeller 4 months ago ?

Yes, has had new water pump.

 

[ian hendo]

Yes, has had new water pump.

How do I test the spark gap jump?

 

[saltchuckmatt]

How do I test the spark gap jump?

 

[ian hendo]

Update... Bought spark plug tester. Found no spark on 1 cylinder. Tested ignition coils and found low resistance on a 3 month old coil.
Trying again in the water this weekend.
Thanks for the advice

 

[Crosbyman]

what is the resistance measurement on the good coils in ohms

 

[ian hendo]

what is the resistance measurement on the good coils in ohms

0.2 and 275

 

[Crosbyman]

0.2 and 275

I guess those are primary and secondary coil values...

what where the reading on the suspect coil ?

 

[ian hendo]

0.2 and 200, I wasn't getting a spark from the coil with those readings.
That was on an aftermarket coil that was 1 month old. Next purchase is a genuine coil!

 

[ian hendo]

0.2 and 200, I wasn't getting a spark from the coil with those readings.
That was on an aftermarket coil that was 1 month old. Next purchase is a genuine coil!

My other aftermarket coil is reading 0.2 and 375... Much better

 

[Crosbyman]

better reading .....but does it provide better sparks ???

problem solved ??

 

[ian hendo]

New coil going on on Fri, and will test and report.

Next job is carb rebuild x 4!

 

[oldboat1]

Possibility of water in the fuel.