16 hp Briggs misses at high RPM

[DanD 9]

Late last summer I started having trouble with the points on my Sovereign with the 326431 16 hp Briggs due to the fact that some oil was leaking past the plunger and seal and into the points compartment. So, I decided to try a MegaFire module instead of going through the work and expense of replacing the bushing, plunger, points and condensor. It seems to work fine, except that if you open the engine up to wide open with no load, it starts to miss badly. Slow it down a little, and it runs perfectly. I've tried three different plugs with no change. I also rebuilt the carburetor since it would sometimes run over ( a project I planned to do for quite a while). Adjusting the main jet while it's missing as described has no affect. ANyone have any ideas? I probably shouldn't worry about it since I never do anything with the engine running wide open anyway. I blew smow tonight and it ran perfectly, (Unless I opened it wide open) so I probably just shouldn't worry, but I'd still like to get it right. I overhauled this engine myself about 5 years ago. It doesn't have a lot of hours on it since then. THanks in advance.

[tec2484 1]

Have you checked the rpm? If you are over reving it it could act that way. I haven't heard of floating a valve in a briggs but it could be possible.

[HubbardRA 12]

Sounds like an ignition problem to me. I am not much on those points eliminators. I will go to battery/external-coil type ignition instead of a points eliminator. That type always works great for me.

[DanD 9]

That wouldn't help me anyway since I'd still have the oily points to deal with. I'll have to find out what the RPM is actually on the engine.

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Originally posted by HubbardRA
Sounds like an ignition problem to me. I am not much on those points eliminators. I will go to battery/external-coil type ignition instead of a points eliminator. That type always works great for me.

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[D-17_Dave 11]

The repair for fixing the points shouldn't be much other than installing a new rubber outlet seal on the plunger and replacing the points and condenser. If this isn't a viable option then having the flywheel polarized and using a Briggs Magnetron ignition system would most likely be a permanent fix.

[RayS 71]

I have the nova electronic ignition on one of my tractors now going on its 6th year and haven`t had any problems. Wouldn`t never go back to points.

[DanD 9]

I know that, but it really would need a new plunger bushing and plunger, along with the seal, points, and condensor, totaling almost $70. The solid state ignition cost about $14 and seems to work perfectly except for the missing at high idle with no load. Perhaps it is over revving as the other post mentioned. I think I'll check that out. I just thought perhaps someone else had run into this problem.

quote:

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Originally posted by D-17_Dave
The repair for fixing the points shouldn't be much other than installing a new rubber outlet seal on the plunger and replacing the points and condenser. If this isn't a viable option then having the flywheel polarized and using a Briggs Magnetron ignition system would most likely be a permanent fix.

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[DanD 9]

The nova electronic ignition that I found when doing a google search seems identical to the Mega Fire module. One website even says it's identical.

quote:

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Originally posted by RayS
I have the nova electronic ignition on one of my tractors now going on its 6th year and haven`t had any problems. Wouldn`t never go back to points.

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