29 smoothies on GS750 questions

[dardoonk]

Reno, any idea why these things are even in there? The main jet screws into the bottom of the block and I can't figure out what they even "gasket". Seems like something to keep grunge from building up in there, but I guess that begs the question " how does the grunge get in there to begin with?"

Thanks for the pic

[renobruce]

Reno, any idea why these things are even in there? The main jet screws into the bottom of the block and I can't figure out what they even "gasket". Seems like something to keep grunge from building up in there, but I guess that begs the question " how does the grunge get in there to begin with?"

Thanks for the pic

I have no idea what they are for. All I can assume is they are just there as a barrier between the block and carb body to prevent metal to metal contact? I know the original ones that were in my set were still there even after dipping... I had to gently scrape them out with a piece of wood.

[dardoonk]

Okay, the Smoothies are rebuilt and on the bike.. My initial jetting is 25 pilots and 130 mains with air screws 1 turn out. Turning the air screws from 1/2 to 2 turns doesn't do anything, so I don't know if that means I am spot on or need to go down to 22.5 pilots.. I suspect I am a bit rich, but it starts well with full choke and after less than a minute I can press the choke off and it holds a real steady idle at 1000rpm. When warm or after sitting for 1/2 hour it starts perfectly.

I think my main jet is too large as it bogs down under full throttle. No, I am not just cracking the throttle-- - it bogs when running about 2500 rpm and quickly, but smoothly going WFO.

I spoke to Z1 yesterday (thank you for the advice).. he thought I might need the smaller pilots, but not to worry if the 25's are working well.

I do notice the throttle hanging a bit at times.. I am sure I have no air leak and my boots and o-rings are brand new. I would think this indicates lean, but that is doubtful. Any thoughts??

[renobruce]

Do some plug chops at min. throttle, 1/3, and WOT. Your plugs should tell all. If you have pods, make sure you don't over oil them... that could cause a bog down at WOT (ask me how I know).

[Tarbash 27]

Im running 22.5 pilot now and 117.5 main on my gs750 with pods and 4-1 exhaust. The main jet is perfect but the 22.5 pilots seem a bit to rich. The lower rpm range is running a bit rich but once you get to wot open throttle above 5,000 rpm The bike takes off and I start to slide off my seat.

If you throttle is hanging, take the return spring from a set of vm26 carbs and put it on the 29's. Mine was at first because the 29's spring was softer than the spring on the 26's.