carb balance screw adjustment

[salamander]

Ya I am going to replace it anyway, how hard is it to locate a new petcock diaphragm? Most shop carry it or is it dealer only item?

Can't say I've seen everything, but all the oem sources I've seen/used sell the petcocks as a single unit, not as individual parts.  My son's bike has had petcock issues, and looking around here for possible answers, I've never seen anyone mention a source for just the diaphragms.

If you're willing to replace the diaphragms, you're clearly willing to take the petcock apart.  You may just need to clean out the passages like was mentioned before.  While you're in there, check the diaphragm.  It's pretty thin so be careful with it, but hold it up to a light and check for holes or tears that could cause a vacuum leak.  Also see if it's still flexible and not hardened or stiff.  Just be aware if you take the petcock apart that there's a spring in there, so be ready for it when you separate the petcock body.

And before you even go near the petcock, try removing the inline filter.  That's easy and may save you some disassembly of the petcock.

[weedahoe]

^^^ When I had mine apart that's how I did it (held it up through the light) and there was one small pinhole (circled in my gallery pics) that was blocked. It was a small hole in the part of the petcock where the vac line attaches. Everything else are all pretty big passages.

[BockinBboy]

See... "Fram Inline filters & Fuel Starvation"

That thread you linked shows my exact setup on my craftsman mower... Kind of scary how close that pic is to what is sitting in my garage. It's got a fram inline filter and if it goes below half a tank, it's starts chuggin and ready to stall unless I'm goin downhill lol.  I've known it's the filter, but haven't hardly had to mow this year so it never got done and the bike took precedence 

- Bboy

[Calpantera]

See... "Fram Inline filters & Fuel Starvation"

That thread you linked shows my exact setup on my craftsman mower... Kind of scary how close that pic is to what is sitting in my garage. It's got a fram inline filter and if it goes below half a tank, it's starts chuggin and ready to stall unless I'm goin downhill lol.  I've known it's the filter, but haven't hardly had to mow this year so it never got done and the bike took precedence 

- Bboy

Now there's a man with his priorities straight!! 

[Paudie M]

Update i replaced the vacuum vent t-connector and hose. I cleaned out the carbs and set the air idle to 3 turns out. I changed the oil and oil filter. I got it ticking over ok so decided to use my new carbtune pro to sync, i had the tank unbolted so i raised up the front of the tank and put a piece of wood between the frame and tank, check out baltimore gs for instructions on how to sync carbs, thanks mate. Now i have a new bike. I took it out and couldnt believe it.
No more dying at full throttle/ fuel starvation issues

Thanks everyone for your help !!!