johnson 1991 35hp

[allan93]

help please.. my engine starts fine idles fine trolling not a problem anytime i give it throttle its last maybe up to 15 mins then starts to bog or jerk (not sure how to explain it) i reduce throttle and it idles and trolls fine...any ideas

 

[tashasdaddy]

Re: johnson 1991 35hp

is the vent open on the fuel tank. fuel pump cannot pump out of a vacuum. plastic tanks, had a knob in the center of the cap that has to be open.

 

[allan93]

Re: johnson 1991 35hp

yes its open ...replaced plugs and fuel filter and had the carb cleaned

 

[tashasdaddy]

Re: johnson 1991 35hp

does it feel like you hit something? may a submerge log, does it bang or make a noise?

 

[allan93]

Re: johnson 1991 35hp

nope doesnt feel like its hit anything the engine just starts to jerk ater a little while on 3/4to full throttle and loses power so i reduce the throttle and all is fine on idling or on very slight throttle

 

[tashasdaddy]

Re: johnson 1991 35hp

next time it does it, immediately check you spark. does having someone pump the fuel line bulb help keep it running.

 

[allan93]

Re: johnson 1991 35hp

the engine doesnt cut out at all but ive tried the the bulb with no diffirence

 

[chewie1997]

Re: johnson 1991 35hp

possible a dirty fuel line preventing the fuel needed approaching WOT?

 

[tashasdaddy]

Re: johnson 1991 35hp

it runs 15 minutes at WOT, then bogs, that is why i suggested spark, coil could be heating up and failing, the motor would still idle on one cylinder.

 

[allan93]

Re: johnson 1991 35hp

im new to this forum ok ...what is WOT

 

[chewie1997]

Re: johnson 1991 35hp

W ide
O pen
T hrottle

 

[allan93]

Re: johnson 1991 35hp

hi all ..i replacedthe ignition coils on the engine and was out today for 2 hours no problems

 

[Al-53]

Re: johnson 1991 35hp

Glad to see your up and running again....Tashasdaddy hit it right on...

I follow all the 35HP threads as I have one also..so your problems may help me in the future...

glad your cruising again

Al