Issue with carb diaphram?

[noiseguy]

OK... I re-read the entire post this time.

There's a few things to check. I'm going to assume that the carbs are sorted out internally (and you're rejetting them), so we're looking for something else. Also that you've checked boots front and back, vacuum line. Cable's aren't hung up.

There's a whole checklist for hanging idle... I'd read that first in the FAQ section of the board. From memory:

1) Check your valves, and set them if needed to the widest end of the spec if any are tight (I'm betting this is an issue, if not the issue)
2) Check your exhaust gasket... leaks can cause lean running as well
3) Check fuel flow... that you're getting enough gas to the carbs
4) Check carb balance... either eyeball the plates or get/make a balancer.

[craigs449]

OK... I re-read the entire post this time.

There's a few things to check. I'm going to assume that the carbs are sorted out internally (and you're rejetting them), so we're looking for something else. Also that you've checked boots front and back, vacuum line. Cable's aren't hung up.

There's a whole checklist for hanging idle... I'd read that first in the FAQ section of the board. From memory:

1) Check your valves, and set them if needed to the widest end of the spec if any are tight (I'm betting this is an issue, if not the issue)
2) Check your exhaust gasket... leaks can cause lean running as well
3) Check fuel flow... that you're getting enough gas to the carbs
4) Check carb balance... either eyeball the plates or get/make a balancer.

Yup, positive the carbs are crystal clear at this point, I have taken the manifolds off-inspected them for cracks-and re-installed them with a nice bead of grease to ensure a leak free fit, I have a brand new piece of vacuum line that I will cut to fit upon re-assembly, and the throttle/choke cables move freely with no hangups.

i will be checking valve clearance before putting it all back together........I also suspect that this may be culprit....one or both ex valves are tight and not giving enough room for gasses to be expelled from the combustion chamber, causing a hot and lean condition.

Thanks for all the info/suggestions/help

-Craig

[craigs449]

Well, I pulled the valve cover today to check the valve clearance, and much to my dismay they are all too tight!  My feeler guages only go down to .04mm and even that size was not squeezing in there!  I have adjusted the valves on my DRZ 400 sm, XR 50, and my Husq 510 SMR, and I have never had more than two that needed adjustment at a time!  So, I ordered the shim kit ($120!!!!!) and the Motion Pro tool for depressing the bucket......

We will throw the cover back on to keep any debris out of there until the shims and tool some in the mail.......