Gs1000 lean in cylinders 2 and 4

[Guest]

Pulling apart my recent purchase for maintenance. Took the exhaust off out of boredom (replacement will be here next week) and took a peek at the valves. 1 and 3 are fine, but 2 and 4 are chalk white. The carbs are in the middle of a rebuild. All the o rings were dry, fuel at some point was leaking from some or everywhere. Bike was straight piped on stock jets with 2-1 pipes (1-3 and 2-4). Don't know much aside from that. Haven't got to a valve adjustment yet. Any ideas?

[tkent02]

Do a valve adjustment.

[Throttlejock]

About to order the tool if Z1 can stop emptying my cart when I checkout. Was hoping that was the case and not something else.

[gustovh]

About to order the tool if Z1 can stop emptying my cart when I checkout. Was hoping that was the case and not something else.

Look up the zip tie method for adjusting the valves, it works quite well and you probably already have the zip tie.

V

[Throttlejock]

I'm not sure I trust myself with the zip tie method. I do have some, but they're the smaller ones, about 4-5 inches long and thin.

[JTGS850GL]

Assuming that you still have the stock air box. Verify that the jets are all OEM and the correct size. Complete a thorough carb cleaning per the correct procedure depending on which carbs you have. You never mentioned what year it is, so don't know if you have VM or CV carbs. I'd dump the straight pipes and go with either stock or new aftermarket (V&H or Delkevic). Get those valves adjusted first though. Don't even bother trying to get the carbs synced until then. Good luck and enjoy.

[Throttlejock]

Assuming that you still have the stock air box. Verify that the jets are all OEM and the correct size. Complete a thorough carb cleaning per the correct procedure depending on which carbs you have. You never mentioned what year it is, so don't know if you have VM or CV carbs. I'd dump the straight pipes and go with either stock or new aftermarket (V&H or Delkevic). Get those valves adjusted first though. Don't even bother trying to get the carbs synced until then. Good luck and enjoy.

Carbs are VM and I've been rebuilding them with new O rings. All have been dipped in berryman's and had passages blown out with carb cleaner. Jets are completely stock, but I have new 100 mains on the way from Z1.

Maine thing I have noticed is that the float needle gets stuck or moves very slowly on the 2 carbs I have reassembled. Any idea what would cause that or how to fix it?

[chuck hahn]

OK...so on VM 26s you have the MIXTURE screw on the side of the venturi. This meters air into the fuel / air mix. Turning the screws IN will RICHEN a cylinder. Out will LEAN a cylinder....so you do have some mixture control well before jumping the conclusion the jetting is all jacked up. CV carbs require the mixtures be adjusted via changing jets. See the stickys at the top of the carb section and youll see one about CV carb tuning proceedures.

This is true also if its stock or a 4 into 1 exhaust. Heres a GREAT toll for tuning VM carbs. Its called a COLORTUNE.

https://www.youtube.com/watch?v=ve_7Qby7f-E