wont recover from full throttle

[muzakstylee]

Ok, bike is an 83 gs1100e. Has 1166 pistons, dyna 2000 ignition, vance and hines 4/1, pods stock cv carbs with stupid large mains. It pulls really strong at full tilt and when I get off the gas it stumbles really bad in the 1/8 to 1/4 range once I get back to 1/2 or above it pulls but after hearty amount of POPs and bangs. If I roll slow into 1/4 it runs ok. It just dosnt want to cruise after full throttle pulls. Original thought was needles but I'm curious if floats may be to blame. I'm lost mikuni states floats on cv carbs have a lot to do with off idle. But what's strange is how it won't recover after hard pulls. Any ideas.

[7981GS]

Have you tried running it in the "Prime" position on the petcock?

Daniel

[Billy Ricks]

Check the needle jets on the slides. If they aren't slotted to allow for adjustment someone just threw some big a$$ mains in there and called the jetting done. You can tell adjustable needles from stock by looking down the carb throat. With the slides up and the needles exposed an adjustable needle will look like a fat needle. Stock needles have very little taper and a blunt end. Without proper needles you'll never get it right. You need a Dynojet Stage 3.

[posplayr]

Check the needle jets on the slides. If they aren't slotted to allow for adjustment someone just threw some big a$$ mains in there and called the jetting done. You can tell adjustable needles from stock by looking down the carb throat. With the slides up and the needles exposed an adjustable needle will look like a fat needle. Stock needles have very little taper and a blunt end. Without proper needles you'll never get it right. You need a Dynojet Stage 3.

Sounds like jetting, but also need to check the basics (float level). Not sure about stock 34mm carbs but with 36mm BS36SS /1166 you need to be closer to 135-140 Mikuni mains and ususally higher (center of the needle e.g. 3rd groove).

[muzakstylee]

Just checked,stock needles. I do know the bike ran pretty good in summer . But with pods and cold weather I'm assuming they wont be spot on. It's just weird to me that the bike will run 1/4 to half fine as long as I dont open her up first. Just weird that carb is cool unless you gun it . Then she fails. Gets worse as she heats up.

[posplayr]

Just checked,stock needles. I do know the bike ran pretty good in summer . But with pods and cold weather I'm assuming they wont be spot on. It's just weird to me that the bike will run 1/4 to half fine as long as I dont open her up first. Just weird that carb is cool unless you gun it . Then she fails. Gets worse as she heats up.

search is your friend

http://www.factorypro.com/tech/carbtun.html

start at step one, and stay there till step one is done, don't go beyond step one till step one is done. Also step one is one before step 2 which is step one.

[blowerbike]

jet kit jet kit jet kit

[BassCliff]

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[muzakstylee]

Thanks guys. I was almost to my wits end with this bike but I suppose I should hang there!

[cableguy]

I'm pretty new to this stuff too, but (please correct me if I'm off track) it sounds like the carbs/plugs aren't recovering from being way too rich on WOT, almost like the plugs are close to fouling, and once that excess burns off it runs OK again. If the floats are stuck wouldn't gas just pour out of the vent?

[OldVet66]

Too rich on the needles will fowl plugs at full throttle. Ask me how I know.

[chef1366]

Look at the 3133 Dynojet kit. The largest main in the kit may be too small for the 1166 kit.
Is the head stock?
What size main in in there now?

[cableguy]

This might help

[GSexpress]

If the plugs were fouling at WFO they would start to miss while still wide open.

What you have is a fuel flow problem. WFO is lowering the float bowls to where there is very little fuel left for returning to normal mix at lower throttle. They may be too low to begin with but the fuel is not flowing fast enough to fill them back up quickly. That is why a slow roll on works. You need to check for flow restrictions from the tank. Pull the petcock and check the strainers too. And make sure your float levels are correct. and bowls are clean. Then start working on making sure the jetting is correct. Fuel flow problems can play hob with getting a propper reading on jets.

[muzakstylee]

Ok did some pulls today and plugs show stark white after wot. mains are mikuni 167.5 needles are stock but raised and floats are 20 mm. It seams like awful lot of jet to still be lean