from 39 to 29mph why?

[rubennh]

What could be the main reason to drop 10mph as a matter of seconds, plugs? coils? any help will be highly appreciate it, thanks. (125hp Force)

 

[roscoe]

Re: from 39 to 29mph why?

Hmmm, down a cylinder.

Loss of compression, head gasket?
Lost a plug, plug wire, coil, or signal from trigger.
Ingested a reed.


Ckeck for spark first, then compression.