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Question

hey its me with the 70 hp johnson. i cleand all the jets and had no improvment. i noticed all the jets were screwed all the way in, is that normal? what else could be wrong?

Submitted: 198 days and 23 hours ago.
Category: Boat
Value: $15
Status: CLOSED
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Posted by TOM 198 days and 21 hours ago.

Info Request

Hi. I'm not sure if I worked with you prior. Please update me with your info If you would like me to help you. I would need the history & model & serial of the motor please.Thanks.

198 days and 20 hours ago.

Reply

i have a 77 70hp johnson. it cuts out and dies when you hit the throttle but idles fine and runs fine with the warm up lever. i was told to check end clean the carb jets and that didnt solve my problem is there something else that could be wrong? it also runs fine out of the water without a load on it.

Posted by TOM 198 days and 20 hours ago.

Answer

Hi. You need to check this in the water, a motor will seem to run fine out of the water on muffs, but you need to put a load on it. First make sure you have good spark on all cylinders & if you have not checked the compression I need you to do so . If that is ok take the boat out on the water & start to give it throttle & as it starts to act up & die click the choke & see if that improves the running & if it does you still have a lean running problem. The other thing I want you to do is pump the primer bulb on the fuel line to make sure it's not running out of fuel. I hope this helps. Please click accept. If I can be of further help please contact me. Good luck & Thanks.

198 days and 20 hours ago.

Reply

i have good spark and have had it on the water it dies when i hit the choke. i havent checked the compression or the primer bulb.

Accepted Answer

Hi. It does not seem like a lean running fuel issue, could be a rich running. The other thing to check is the ignition timing is advancing, when you push the throttle down the timer base under the flywheel should move an inch or so, (which advances the timing, if the timing does not advance it could cause this problem). The other thing is the carb's need to be adjusted to open at the same time with the timing advancing. (should have a service manual to set that up.) I hope this helps, Good luck & Thanks. Get back to me with any other questions after you check all these items. Please click accept.

Expert: TOM
Pos. Feedback: 96.2 %
Accepts: 
Answered: 5/10/2009

Marine Mechanic

28 YRS, JOHNSON & OMC COBRA MASTER TECH, MERCURY/MERCRUISER CERT,VOLVO & YAMAHA TECH. USAF TRAINED

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