I understand, I've had no tank venting issues at all, this is an effort to go pumpless with no problems on the back burner in my brain. If reinstalling the pump gives me peace of mind and confidence that's what I'll do -but I don't to-. thanks, Ted

eblack wrote:
PS. Gram, read my jetting profile I haven't addressed that issue yet I want to solve one issue at a time before I move on. But would a smaller main draw less fuel(out of the bowl) or is that too small of an amount to make a difference. I've had no highend problems at all (actually no problems at all but I know the jettings off.) Thanks. Ted

I am assuming that since you have the stock needle, the 185 main is probably the stock main. If thats true you need to think about putting in an aftermarket jet kit. Like the one Baron's sells. The stock needle is really tough to jet with using aftermarket accessories.

Also, 6 turns out on the pms is outside its control range. Its only good for about 4 honest turns. There's no real benefit after about 4 turns. In fact they sometimes fall out when they are turned out that far.

If you reduce your main for an aftermarket needle (you will have to with an aftermarket needle) you will probably end up running richer and using more fuel. But thats hard to tell without more information.

So, its hit or miss with a needle change to solve the fuel starvation issue. You can try it, but reducing the main size with the stock needle gets tricky. I would vent that gascap, or drill out the vent tube to ensure proper running. I know some have gotten away without it, so thats just me. That pinhole is too small for most bikes to keep from getting too much vacuum in the tank when the fuel is low, and it ends up obstructing a gravity fed fuel system.

Just my $.02. Based on a couple of pump removals now, each had starvation issues until we vented the gascaps.

But remember, a vented gascap leaks fuel when your bike is down. Thats why some drilled out their tank vents instead.

Gram

I vented the gas cap, plan of test driving it here shortly. Had a bike shop dyno my bike back when I bought my air cleaner so this is the jetting setup they did. All this was done BEFORE I somewhat educated myself about jetting my carb. , so now I know that my current setup is wrong; but I want to solve the pump situation first considering the bike does/has run well. I'm going to buy a barons jet kit and start from point A in the near future. If the main ends up being smaller the the current 185 wouldn't that help out by pulling fuel out of the bowl at a little bit slower rate? Thanks for your time, Ted

eblack wrote:
If the main ends up being smaller the the current 185 wouldn't that help out by pulling fuel out of the bowl at a little bit slower rate? Thanks for your time, Ted

Yes, but with the stock main you will most likely end being too lean at least in the midrange, and potentially all the way up to WOT. The stock needle is really really fat and does not allow a lot of fuel through the needle jet as is. It is so fat it essentially 'chokes' the flow from the main. This will really illustrate the point:

99-03 rejet with aftermarket needle and aftermarket accessories = bigger main.

04-07 rejet with aftermarket needle and aftermarket accessories = smaller main.

When Yamaha built the 04 motors (and up) they changed virtually nothing in the carburetor, including the needle. The needle was finely tuned to pass EPA regs at fairly specific rpms. So rather re-engineer a new needle they threw in a large main. Thats my opinion as to why btw...

So you can try it, but you might find some other problems lurking in anything less than a proper rejet, although smaller mains do draw less fuel so might get you a little farther into the bottom of the tank.

Gram