97 Johnson Fast strike dies on take off

[canningtons]

Lads, great internet site: Thanks<br />Fastrike v6 - start runs fine. Stop for skier and restart, at idle revs slightly then comes back to idle. When gunned to take off - dies.<br />I have attended to following with my local dealer<br />- New plugs<br />- New (larger size) fuel line <br />- checked sender unit fuel tank<br />- new prime bulb<br />- new VRO filter seal (at pump)<br />- Checked VRO pump pressure<br />- Done compression test all round (fine)<br /><br />Motor: BJ175GLEUC 4292656<br />Any ideas: A check list of possibilities would be great. Thanks

 

[ob]

Re: 97 Johnson Fast strike dies on take off

Next try performing link and synch procedure which will insure that the carb flaps are opening evenly and in synch with the timing advance.<br /><br />Another possibility is the idle mix is a bit lean.Don't know if your particular engine has adjustable or fixed idle orifices.If adjustable ,they may need to be opened a bit more to richin the idle mix.If fixed type and the link and synch procedure isn't your issue they may need to be increased in size as per your local dealer or someone else that can provide the specifics.

 

[sikpnter]

Re: 97 Johnson Fast strike dies on take off

Does this motor make a snezzing or coughing sound at idle? Mine did the same thing for a while and just like ob said I adjusted the idle mixture to richen it a bit and it fixed it.

 

[Seasport]

Re: 97 Johnson Fast strike dies on take off

Hi JT welcome to the forum.<br /><br />My 2001 150 did the same thing as have a number of other V6's reported here. In my case, the motor would start just fine from cold but after running a while then resting then starting again it would die from a warm start. It would take a bit of revving in neutral to get it going properly.<br /><br />Seemed to be fuel problem but wasn't. I did a few things that together fixed the problem. First was a link & sync as suggested by ob. Not hard to do if you have a service manual. Second I checked and set the ignition timing. Link & Sync seemed to be fine in my case but timing was a bit out. To set the timing on this motor statically you need an optical analyser (I made my own and can provide instructions if you want to have a go).<br /><br />The other thing I found which I think may have been the real cause of my problem was related to a sticking timing sensor plate. On the OIS ignition system there is a rotating plate mounted on top of the flywheel which holds the optical ignition sensor. This rotates in a plastic track. The rotating part advances the timing as the trottle is opened and returns to idle position under spring tension. In my case (and at least one other case that I know of) the rotating plate was sticking and not returning to idle position properly. This had the effect of advancing the ignition timing too far at idle and causing poor operation when starting off.<br /><br />You can check yours by taking the the plastic cover off the top of the flywheel and you will see the sensor plate. As you advance the trottle you can see the plate rotate. It should return smoothly to the rest position when you close the throttle.<br /><br />What I did with mine was to use a bit of grinding paste and lap the two parts together. Then use a bit of grease on the moving parts. Worked a treat. More than likely a shop would just replace the parts and it would cost you a few hundred bucks.<br /><br />I think the fact that it only happens when the motor is warm is related to the Quikstart feature which advances the timing by 10 degrees when the motor is cold.<br /><br />Worth checking out anyway. Let us know how you get on.