Could I have found the problem??

[Spillman1979]

Could I have found the problem?? Ok as many of you know, I have been trying to figure out why I couldn't turn 4k RPMS at WOT on my 87 classic fifty 45hp on my 17ft bass tracker with a 13 pitch prop. I was out in the garage and was looking to make sure at WOT my carbs was opening all the way and they was. But here's what I found, I found that although my throttle lever was all the way forward and carbs open all the way my trigger was not up against the stop. I had a zip tie that was hanging up not letting it advance all the way to the stop. I cut the zip tie and now it has full travel. I can't wait to try it on Wednesday. Do you guys think this could be it?

 

[GA_Boater]

You didn't have full advance. Maybe and lets hope so, Spill.

 

[Texasmark]

Full advance matters. On larger engines timing moves from around zero, give or take, to about 20 BTDC. When you are coming off WOT, a thing Merc called "back drag" allowed the carburetor linkage to start shutting the butterflies but kept the spark advanced. That amounted to a very small drop in speed but a reasonable reduction in fuel consumption. You will notice a difference. How much depends on how much advance you had and how much you have now.

 

[Spillman1979]

It makes since what I found doesn't it? I mean I was probably only half travel until now.

 

[MH Hawker]

i think you have found it, i had a issue with mine but had a 600 rpm pulsing thing due to not getting full advance it would jump back and forth from 4800 to 5400

 

[frobotz]

Mine did this same thing. Ended up being the stator. just topped out at 4000ish rpms. Had to do a running check on the stator to find the problem. Now I am back up in the high 5k range running WOT

 

[Spillman1979]

Well guys that fixed it, it was the zip tie holding it back. Simple fix but I wasn't looking for that glad I done the other things anyways no its ready to roll. I can get 6k RPMS at WOT. kinda scares me to go that hight though what do you guys think?

 

[Texasmark]

Well guys that fixed it, it was the zip tie holding it back. Simple fix but I wasn't looking for that glad I done the other things anyways no its ready to roll. I can get 6k RPMS at WOT. kinda scares me to go that hight though what do you guys think?

I have 2 Mercs that I ran for at least 15 years at and above the upper limit....5800-6000. They loved it!