Wont rev over ~5000rpm

[jprice90]

i've been here before, i first opened an account in 2015. Life got in the way and the bike was parked for a few reasons, a few were taking care of this month. still have some more, but it runs so much smoother.

83 GS850G, replaced the carb insulators with oem, seals etc. replaced petcock with brand new nos oem. carbs were gone through.

Starts runs idles great. But wont rev over 5000rpm. hits like a barrier and wont rev anymore, no sputtering just hits a wall and stays at that rpm. really weird.

i havent poked around yet, just kinda coming on here for some advice on what to check out before i did. floats were set to around 22.4mm

 

[Rob S.]

Is that 5k 'wall' under load?

Did it do that before your recent work?

 

[jprice90]

that wall is a parked neutral rev. it would rev fine when i last had it out and running a few months ago

i was waiting on a clutch cable so wasnt able to take it out. i should be able to tomorrow after clutch install

 

[rphillips]

Very interesting, please don't get it straightened out and go away, I want to know what it was.

 

[KiwiAlfa156]

Did you replace the nitrile rubber plugs that sit over the pilot jets?

 

[jprice90]

Very interesting, please don't get it straightened out and go away, I want to know what it was.

the bike was put away when i bought the house in 2018, wheeled into the garage and parked until 3 months ago on a bet that it would start right up, with a condiment bottle fed to the carbs, it fired right up.

it could be an airleak on the airbox side. i'll mess with it after work tomorrow

 

[jprice90]

Did you replace the nitrile rubber plugs that sit over the pilot jets?

i did, and after forgetting them and or not think they were important years ago, i always make sure i got them.

 

[Nessism]

Did you remove the pilot jets and hole them up to a light, making sure the orifice is open?

 

[rphillips]

You said, "It would rev fine when I last had it out and running a few months ago". I took that as you had it out and running then parked it for a few months, then got it fired up again but now it won't rev... Now thinking maybe it was revving fine, then you did all the work listed in post #1 and now it isn't revving, that sheds a completely different light on things.

 

[salty_monk]

If you don't find something in the fueling I'd look at the igniter next. On your bike it has the electronic advance so you need a mechanical advancer conversion to use the Dyna S or you need to use the Dyna 2000. Good luck.

 

[jprice90]

i didnt have time today to take the carbs back off. i was almost positive it was something in the carbs because i had disassembled them.

looking into my tool tray earlier, i seen the washers that go before the main jet. that may be the issue.

im hoping i'll be able to get into them on Thursday