Jetting recomendations please....
Posted January 23, 2006 - 02:00 AM
99 WR400, stock but for a PMB muffler and open box.
Location is tropical, frequently in the low 90's, highest humidity possible. I am running a JD red at middle clip, seems one clip richer is slower, one leaner is slower. I'm at a 168 main, and stock pilot and everything else. The issue is that my fuel screw (easy adjust) does not alter idle speed at ANY setting. I can run it all the way in or out without altering the idle in any really noticeable way. I know my ac pump is not working right so I'm going to get one of those 80$ adjustable pumps, but while I do that I thought maybe I should change out at least my pilot jet and any other "good bets" for a better running bike as far as carb changes go.
One not so little issue that I'm wanting to fix is a habit of this thing to sputter when I shake it hard like on fast bumps. This I'm pretty sure is the float adjustment, my question is whether or not it's getting choked or starved for gas? My guess it's choking... lower the level by a mm? It also occasionally will foul out and need a lot of cranking to start.
Oh (sorry), is it possible for one 168 jet to run differently from another 168 jet (unaltered)??? I swear the other one ran better
Thanks very much!
Posted January 23, 2006 - 04:00 AM
if the fuel screw does nothing, you are out of range - either way lean or way rich.
In our climate, we have to go leaner on our settings. Try a smaller pilot jet.
It sounds like you have the right needle position from what you describe.
The 168 main might be a bit fat, try a 165. Rich and the bike will stumble, like cutting out. Lean the bike will struggle to build speed, bog, sound real ashmatic.
Fix your carby - get it in full working order before playing around with jetting. You are wasting your time if you dont.
Posted January 23, 2006 - 08:42 PM