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Message started by Librandi on 07/24/17 at 13:31:52

Title: stalls and surgres
Post by Librandi on 07/24/17 at 13:31:52

I have a 2000 ls650 stock across the board. At the end of last summer she died on me and wouldn't start up. It just happened that I was two blocks from a local shop and I pushed it there to have them look at it. The cleaned the carb and it ran for a week ok. Now it will not stay at idle and when I ride when I am at about 1/4 throttle to maintain speed the RPMs will keep dropping and then kick back up.
So far I have pulled the carb and cleaned and rebuilt it with a kit KS-0531 jets are 70 & 130. found an intake leak and replaced the hose and clamps no more leak. There is an exhaust leak.
there is a thick black exhaust leak when I hit the throttle. I still use the original petcock and ran the checks on it that are listed on this site. Battery is good. new spark plug when I redid the carb along with a new fuel filter. my elevation is most the time at sea level sometimes below it if it rains too much. :-[

Title: Re: stalls and surgres
Post by ero4444 on 07/24/17 at 13:48:56

try running petcock on PRIme for a while

Title: Re: stalls and surgres
Post by verslagen1 on 07/24/17 at 13:51:32

53587D7666757A707D140 wrote:

Now it will not stay at idle and when I ride when I am at about 1/4 throttle to maintain speed the RPMs will keep dropping and then kick back up.

Sounds like you need to adjust the white spacer. You can replace with 3 #4 washers

Quote:

So far I have pulled the carb and cleaned and rebuilt it with a kit KS-0531 jets are 70 & 130.

I'm unfamiliar with K&S jet numbers. If they are the same as Mikuni's then they are way off.

I would recommend you get a jet set from lancer.

Title: Re: stalls and surgres
Post by batman on 07/24/17 at 20:27:32

The KS-0531 kit looks silly to me ,they say it's for the LS-650 from 86 to 2010 . the 86-87 carb had a larger throttle plate,and ran 47.5 pilot/155main jets(stock) ,your bike should have had 52.5pilot/145 main, (stock) The 70 pilot is WAY to rich at idle and the smoke your seeing is unburnt fuel. even at sea level you shouldn't be running more than a 55 pilot, and a main jet in the 152.5/ 155 range. the needle jet ,jet needle were also different in these carbs ,you should check to make sure the needle jet you installed(new) is straight ,not tapered .You should check your petcock as that could also be a place where you are getting to much fuel.( if there's a hole in the rubber diaphragm fuel will be sucked down the vacuum line).

Title: Re: stalls and surgres
Post by Librandi on 08/08/17 at 09:16:36

rejetted and still acted wonky. So I started from scratch. and the first thing I re checked is the petcock and crud it is leaking. so I received my raptor today and will switch it out and see if I can get it to run. thanks for the support and fingers crossed.

Title: Re: stalls and surgres
Post by Librandi on 08/09/17 at 16:51:24

Well put a new spark plug in to boot and got it to run almost for 1/2 a second. Now I am smelling gas. I reset the air mix screw to three turns. choked it and nada. I am thinking that its flooding out so??? Pull the carb and check the float bowl. make sure everything is working in there? and since its out may as well run in through the cleaning process again. Any suggestions?

Title: Re: stalls and surgres
Post by Yoshi on 08/09/17 at 17:30:47

The petcock has a fuel filter, I'd recommend removing the extra one

Title: Re: stalls and surgres
Post by verslagen1 on 08/09/17 at 18:21:21

4942676C7C6F606A670E0 wrote:

smelling gas=flooded, don't coke it, start with 1 1/2 turns, WFO throttle, when it sounds like it's trying, release the throttle and start normal.

DON'T HOLD THE START BUTTON FOR MORE THAN 30 seconds, then give 15 minutes to cool off.

If you can't get it going, put in a new plug.

Title: Re: stalls and surgres
Post by justin_o_guy2 on 08/09/17 at 19:23:19

Check air filter

Title: Re: stalls and surgres
Post by batman on 08/09/17 at 22:45:38

check for a high oil level(gas in your oil?)

Title: Re: stalls and surgres
Post by Librandi on 08/11/17 at 08:56:42

Update.
1. Inline filter is now gone.
2. Air filter. had a little gas.
3. Engine oil-- filled to the brim with gas.
That gas had to go somewhere and gravity says the answer is DOWN.
So drained it cleaned it and filled it with oil.
Two things happened: It now starts and idles smoothly AND I fricken crushed the o-ring one the oil filter lid. I hate doing dumm things. So now I need to order a new o-ring.
BTW it ended up that I had to set the air mix needle to 2 1/4 turns.

Thanks for the support everyone.

Title: Re: stalls and surgres
Post by justin_o_guy2 on 08/11/17 at 09:42:21

A dab of grease will help keep an o-ring in the groove.
I don't do it, I seat the cap with fingertips, and feel for it going down evenly.

Title: Re: stalls and surgres
Post by SALB on 08/11/17 at 12:20:28

767D585343505F5558310 wrote:

3. Engine oil-- filled to the brim with gas.

Time for a Raptor Petclock. ;)

Title: Re: stalls and surgres
Post by ero4444 on 08/11/17 at 14:27:07

oil in the gas, doesn't that mean the float is sticking open too?

Title: Re: stalls and surgres
Post by SALB on 08/11/17 at 14:56:06

786F72292929291D0 wrote:

oil in the gas, doesn't that mean the float is sticking open too?

You are correct, it could. But why temp fate with the factory petclock that is infamous for sucking fuel through the vacuum port.

Title: Re: stalls and surgres
Post by Librandi on 08/12/17 at 11:29:38

Yup Put in a Raptor.

Went to a test run today. and I had forgotten how good it feels to ride a bike that is not sputtering and spurting. I was ready for a divorce but now want a second honeymoon. I think the idle maybe a little low still but opposite of that OH BABY!!!
Thanks everyone. ;D

Title: Re: stalls and surgres
Post by justin_o_guy2 on 08/12/17 at 13:57:23

Low idle is easily resolved, and it can sure be a problem. Mine Would idle low until it's warmed up, but I keep it up with the throttle. It's not a big deal if it drops below the recommended 1,100ish RPM, just don't wanna let it stay there long enough to let the top end start losing the film.
Idling with it on the sidestand robs the cam of oil , even IF it's spinning over at the right RPM.

and I had forgotten how good it feels to ride a bike that is not sputtering and spurting. I was ready for a divorce but now want a second honeymoon..

Interesting choice of words. Until I saw honeymoon I was willing to shrug it off. Now I'm thinking it was more of a Freudian slip.. It's good to see someone Really Like riding.