GS850 Rough Running, Bogs down

[Guest]

Hi All!
It?s been some time since i posted regarding the on going project of repairs to my 79 GS850. I have been reading lots of past posts on all things related to her repairs. Now i need some help!


The current symptom:
On cold start fires up on choke first time warms up at 3500rpm, good so far. On pulling out in first gear it bogs way down to almost dying. If i pull in clutch & rev her up to 3k and slip the clutch she will move out ok. Once up to speed in either 2-3rd gear there?s some poping & snorting mostly from the left exhaust. Get up to 4000+rpm and smooths out. After 2 miles or so the need to slip into first gear is not needed?


What has been done so far:

• Carbs, dismantled & dipped as you always recommend. all new Orings, gaskets. Carbs were synced after installed.
• Air box is nice & tight with a K&N filter. (was jetted with the K&N)
• All electrics test fine.
• DynaS igniter installed by PO
• Dyna coils recently installed to match the igniter.
• Compression check was good.

Any/all help needed as i really would like to get out and ride. The weather in Key West is starting to cool. Now is the time!!

[Big T]

New intake boots?
Intake boot O rings?
Valves adjusted?

[Guest]

Yes on O rings, old boots were still in good shape.
Valves to be checked is next. Can valves out of adjustment be the cause of some of the issues?
Many Thanks!

[Steve]

Valves always tighten up with time/miles. Tight valves make it harder to start, especially when cold. If your bike is starting easily, the valves are likely not <too> tight, but that does not mean you don't need to check them. When you do check them, make sure the cam lobes are positioned properly. HINT: "properly" is NOT with the lobe pointing directly away from the valve.

What are your air screw and fuel screw settings on the carbs?

"Warming up" at 3500 RPM makes me cringe. 2000 is perfectly adequate.

.

[Guest]

Steve,
I did not do the carb's myself & will check with the mechanic & let you know. We will be doing valves soon. Bike once its warmed up is doing well but can't really get out for a ride due to this pesky tropical storm that will be around for a few days! The 3500 on warm up is my fault got a little carried away.

Thanks

[Big T]

A VM bike, in your temperatures, should start instantly without choke and warm up in the time it takes to put on your gloves

If it doesn't, you need a new mechanic