I picked up a project bike that had been restored. Well, sort of. It looks pretty good, but some of the work was questionable.
I'm getting close to firing her up and in checking valve lash yesterday I noticed the plugs were pretty black. Carbon. Quite a few of my bikes have required jetting changes - including the LM3 that came from new with the exact correct jetting. A PO had changed the jetting who knows why.
Anyway, I've heard discussions that the larger carbs are totally unnecessary, yet Richardson has the view that these bikes can always benefit from bigger carbs. Some have said there will be poor performance and worse mileage with the larger carbs. I don't believe that and figure they just didn't get it jetted properly.
In my experience, a liter bike should get 45-50 mpg with snappy performance. Many times I've started with bikes that got high 30s to low 40s and were sluggish. Once the jetting was right, mileage went up considerably along with performance. It's a bit of a long drawn out process, so hopefully some of you have already sorted this one out. What worked for you? Give me a baseline to get most of the way there.
I've been thinking of trying the jetting for the LM3 or LM4. But they both have the main jet shroud and behave differently.
