Join Date: May 2009
Location: Indiana/ Michigan line at the Lake
First, welcome to the site.
2nd: Is the lurching at ALL rpms above 3,000?
My first stab is what Tom said about the gascap vent.
The other would be fuel flow at a trickle, but not enough to
hold higher revs? This was the reason for asking about all rpms
compared to just one place on the tach.
This would lead back to the venting or a possible fuel flow issue.
Loose or cracked vac-hose from carb to fuel valve/ petcock?
Float not dropping far enough to fill quickly enough.
Holed diaphram in the carb. This would run fine on the low jet
until the needle comes on.
Really none of these issues should exist other than the first. Crud/dust
clogging the tank vent in the cap, or the little rubber thingie in the cap stuck.
On the other end if the fix is not that simple, I listed some of the stuff which I
also believe is in the service manual troubleshooting guide. Quite possible to have
received a factory "booger" on a part that normally doesn't fail, or rarely does
unless one gets past the quality guy and makes its way onto a bike. A bad whatever
would crap out more or less right away. On my '09, many of the hoses and rubber
cover boots were dryrotting by the second summer and were all replaced over the
course of a year or so.
I hope ya nail this out quick and simple,
or at least free at the dealer.
This is my son, with whom I am well pleased." ----God