Fine tuning '82 GS450L carbs - new exhaust

[incarceration]

This is driving me nuts!

I have the slow startup, SOMETIMES. It can be driven around then stopped and go to start up again and it'll take rolling back on the throttle to get going cause of it being a poor start up at first. Other times it'll crank right up when pushing the button.

I notice it gets worse as the engine and engine area gets HOT, like, riding it for about 20min or so. On my way home from work I noticed after a lot of stop-go traffic it was idling at 2,000RPM after it was idling perfectly just before heading home when I took it to a shop here to see what they had to say about it.

The guy at the shop even took it around and congratulated me on the work I did and said it's running beautifully and that he hasn't seen a bike of its age running so well before. We tried shooting it with ether around the boot openings and it didn't do anything, he even shot it around them with a LOT of ether and didn't do anything (sputter, rev higher, etc)

What the hell is going on? Why is it idling so high @ 2,000RPM only when really hot and being driven? And why is the start up sometimes really, really weak?

[Guest]

You didn't answer earlier on your choke... do you start with the choke on?

What's the current status with your jetting? Don't be surprised if the 45 is too rich and you need to back to the stock pilot.

One thing I noticed when I first rode mine after the rebuild... I thought I had warmed it up nicely on choke for a few minutes, then started riding with choke off. I had adjusted the idle to 1100RPM at this point.

About 1 km up the road I had to pull over and wind the idle way back down as it was idling at around 4000RPM.

Since then the idle is fine, lesson learnt... don't bother adjusting idle til the bike is nice and warm.

[incarceration]

Yeah I start it with the choke to the left about 2\3 of the way and ease my way back as it warms up until eventually taking off with the choke off (completely to the right.)

I tried taking it to the shop here that said they could sync the carbs for me and they didn't find anything wrong with it. I asked if they even had a monometer and the guy said they didn't have one so I have to find another shop with one.

I usually wait a few minutes before taking off so it can warm up. But I'm riding it and it seems to be running great; I rode around town not too long ago for about 30-45min and it idled fine at every light.

[Guest]

When mine was stock you push the choke down to put the choke on from memory and lift it to turn it off... been a while though!

Good news it's been running nice