Leaking low speed mixture screw?

Jam3s · October 18th, 2009, 11:01 AM

This morning i decided to get the bike started and go for a short ride but its very cold here in NW Indiana so getting her started it a project... I had enough time to adjust the mixture screws so i richened up both cylinders about 1/4 turn each. "when its this cold out the bike wont even start with the choke on." After that she fired right up even without the choke! WOW i went for a short 15 mile ride and was blow away i was having so much fun the bike was pulling so hard all through the revs. But i noticed my idle went from 1300rpms to 1500-1600. so i went home and parked the bike and checked the carbs and this is what i found.

it looks like the right mixture screw is leaking?

By the way this is my bike

kkim · October 18th, 2009, 11:18 AM

Jordan,

Sorry, can't see your picture clearly of the mixture screw area. Can you take another??? Possibly use the macro feature on the camera?

If the screw is backed out too much, it can leak, I believe. You should check to see how many turns you are backed out on that mixture screw. Also, there is a gasket in there, so that could be leaking.

Jam3s · October 18th, 2009, 11:27 AM

Better pic. Yeah looks like its leaking. hum and i think im only up to 3 turns. has anyone else run into this problem?

kkim · October 18th, 2009, 11:34 AM

Is it greasy or "wet" around that area? Doesn't look like it.

You might want to place a piece of paper/cardboard under that area and leave it overnight to see if you can find traces of a leak. Better yet would be a small container filled with some water.

Jam3s · October 18th, 2009, 11:41 AM

then thats what ill do! btw Kelly what do you think of the K&N R-0990? worth the money?

kkim · October 18th, 2009, 11:46 AM

You'll lose some low end w/o the airbox, but I feel the gains were worth it in the midrange through top end pull.

Pulling the airbox out was the biggest problem and if I had to do it over, I don't think I'd switch. I'd keep the airbox, stick a drop in K&N filter (or some other aftermarket filter) and remove the snorkel.

HKr1 · October 18th, 2009, 11:58 AM

Quote:

Originally Posted by Jam3s

hum and i think im only up to 3 turns.

3 turns out, you might just want to go 1 bigger on the pilot jet. It will put the mix screw back in(less turns out).

October 18th, 2009, 11:01 AM	#1
Jam3s n00b Name: Jordan Location: North West Indiana Join Date: Sep 2009 Motorcycle(s): 09 250r Blue Area P, Factory Pro Jet kit, woodcraft rearsets, Galfer SS brake lines Posts: 19	Leaking low speed mixture screw? This morning i decided to get the bike started and go for a short ride but its very cold here in NW Indiana so getting her started it a project... I had enough time to adjust the mixture screws so i richened up both cylinders about 1/4 turn each. "when its this cold out the bike wont even start with the choke on." After that she fired right up even without the choke! WOW i went for a short 15 mile ride and was blow away i was having so much fun the bike was pulling so hard all through the revs. But i noticed my idle went from 1300rpms to 1500-1600. so i went home and parked the bike and checked the carbs and this is what i found. it looks like the right mixture screw is leaking? By the way this is my bike

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October 18th, 2009, 11:18 AM	#2
kkim Join Date: Nov 2008 Posts: Too much.	Jordan, Sorry, can't see your picture clearly of the mixture screw area. Can you take another??? Possibly use the macro feature on the camera? If the screw is backed out too much, it can leak, I believe. You should check to see how many turns you are backed out on that mixture screw. Also, there is a gasket in there, so that could be leaking.

October 18th, 2009, 11:27 AM	#3
Jam3s n00b Name: Jordan Location: North West Indiana Join Date: Sep 2009 Motorcycle(s): 09 250r Blue Area P, Factory Pro Jet kit, woodcraft rearsets, Galfer SS brake lines Posts: 19	Better pic. Yeah looks like its leaking. hum and i think im only up to 3 turns. has anyone else run into this problem?

October 18th, 2009, 11:34 AM	#4
kkim Join Date: Nov 2008 Posts: Too much.	Is it greasy or "wet" around that area? Doesn't look like it. You might want to place a piece of paper/cardboard under that area and leave it overnight to see if you can find traces of a leak. Better yet would be a small container filled with some water.

October 18th, 2009, 11:41 AM	#5
Jam3s n00b Name: Jordan Location: North West Indiana Join Date: Sep 2009 Motorcycle(s): 09 250r Blue Area P, Factory Pro Jet kit, woodcraft rearsets, Galfer SS brake lines Posts: 19	then thats what ill do! btw Kelly what do you think of the K&N R-0990? worth the money?

October 18th, 2009, 11:46 AM	#6
kkim Join Date: Nov 2008 Posts: Too much.	You'll lose some low end w/o the airbox, but I feel the gains were worth it in the midrange through top end pull. Pulling the airbox out was the biggest problem and if I had to do it over, I don't think I'd switch. I'd keep the airbox, stick a drop in K&N filter (or some other aftermarket filter) and remove the snorkel.