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Message started by marekbuk on 08/16/17 at 00:46:29

Title: Running rich - re-jet no difference
Post by marekbuk on 08/16/17 at 00:46:29

i've tried re-jetting pilot and main jets to stop black smoke and very sooty spark plug with no luck - I've gone down 2 sizes on both jets.
I wonder if the De-accelerator valve TEV? Or the choke could be sticking/faulty?
Has anyone had this happen or can suggest another cause?

Title: Re: Running rich - re-jet no difference
Post by Dave on 08/16/17 at 04:04:13

It is hard for me to keep track of all the bike on this site......have you taken off the original vacuum fuel petcock yet? The diaphragm can get leaky and allow fuel to flow down the vacuum line.....no amount of jetting will fix that - but a Raptor manual petcock will.

Title: Re: Running rich - re-jet no difference
Post by Gary_in_NJ on 08/16/17 at 06:30:03

Jet for throttle response, not to cut down on smoke. If you have smoke and a wet plug it is possible that you have another issue

Title: Re: Running rich - re-jet no difference
Post by justin_o_guy2 on 08/16/17 at 07:49:05

Need more information.
Tell us about it.
Read the threads.
See what information people provide that gets the help.

Title: Re: Running rich - re-jet no difference
Post by marekbuk on 08/16/17 at 08:52:33

Ok - will go through the threads but I have a 1987 LS650 c/w Raptor, Dyna, K&M, 152.5 52.5 and 2 washers on the needle the bike originated in Germany
Never had a backfire on the bike unlike my 2005 S40 which pops like a 'good un' on throttle shut off

Title: Re: Running rich - re-jet no difference
Post by Dave on 08/16/17 at 09:16:24

My starting point for jetting at sea level is #150 main, #50 pilot, and 3 washers on the needle....and that is with E10 fuel.

If you are running gasoline without ethanol, you likely will need smaller jets as pure gasoline needs a less rich mixture than E10.

Title: Re: Running rich - re-jet no difference
Post by marekbuk on 08/16/17 at 10:24:01

Thanks Dave - 150/50 jets are in the post and I am tgoing to clean the TEV and choke tomorrow - fingers crossed!

Title: Re: Running rich - re-jet no difference
Post by IslandRoad on 08/16/17 at 19:12:48

I eventually settled on 52.5/152.5 with the spacer at 0.4 of the original size. I'm at sea level and don't run ethanol blends. I could get away with being a touch leaner but I've gone with a setting that seems to pretty well cover the temperature and humidity variation where I live.

At a slightly leaner setting I reckon I get a touch more punch on acceleration, but I also get a slight lean surge during certain weather conditions.

Title: Re: Running rich - re-jet no difference
Post by marekbuk on 08/21/17 at 10:40:01

Cleaned the carb again - this time taking the choke and TEV out - put in 150/50 jets and lowered the needle - almost perfect! A little rich but better than lean. Only thing that I don't like is when I'm stationary and I blip the throttle the motor nearly stalls i.e. when I close the throttle and then the revs pick up again and settlle to a nice idle - I'll try raising the needle to the middle slot

Title: Re: Running rich - re-jet no difference
Post by Dave on 08/21/17 at 11:41:29

Don't fuss with the needle for idle/blipping issues. The needle controls the fuel mixture when the throttle is about 1/8-1/4 open.....if the bike runs good when you accelerate at a slow pace (like in a school zone or when the Law Enforcement is watching you )....leave the needle alone. If the bike has a hunting/surging at light throttle settings - then add a washer under the needle.

When you blip the throttle and get the engine rpm up, then close the throttle - you have created a situation with high engine vacuum and low fuel flow as the slide has dropped and closed off the fuel flow from the needle jet. The only fuel flow that is occurring is coming from the idle circuit or the TEV. You can try raising your idle speed a bit, or opening the idle fuel screw a small amount.

Title: Re: Running rich - re-jet no difference
Post by marekbuk on 08/21/17 at 12:06:31

Cheers Dave - I'll leave the needle alone and have a play with the idle screw.
Pleased I don't have to take the needle out again - the screw heads are pretty worn and they are pesky things to position at the best of times