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General Category >> Rubber Side Down! >> lurching problem
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Message started by wifes bike on 07/11/08 at 21:13:01

Title: lurching problem
Post by wifes bike on 07/11/08 at 21:13:01

hey guys i have an 07 s40 and it lurches real bad at low speeds when its cold for a long time and when you wind it out ir runs just fine, ive ridden bikes all my life and this isn't normal after sitting and idleing for 5 to 10 mins it still lurches and for about 15 -20 mins of open road riding after the warm up then it still does it but not as bad :'( what can i do. the dealer said it was nothing and its just a big single and thats what they do . any help would be great thanks in advance
p.s great forum and awesome tech info you guys rule ;)

Title: Re: lurching problem
Post by rpgpgmr on 07/11/08 at 21:22:06

No the Stealership was wrong. That is NOT what these bikes do. Typical excuse for when they have no idea what's going on. Where are you located ... far North? They are generally unhappy in very cold climates and you'll find several posts on that subject.

I don't live in a very cold climate, but I had a problem with the lunging too. It was due to my spark plug. They are cold-natured bikes so they do require some time to warm up, but 10 minutes should be plenty! I would check the spark plug.

Title: Re: lurching problem
Post by Dj12midnit on 07/11/08 at 21:23:53

Sounds like its real lean have you tried running it with the choke out?

Title: Re: lurching problem
Post by wifes bike on 07/11/08 at 21:26:48

live in north carolina not cold changed the plug and it is lean nee

Title: Re: lurching problem
Post by skrapiron on 07/11/08 at 21:27:15

Mine did the same thing until I did the white spacer mod and then adjusted the A/F settings on the carb. Everything you ever want to know about carb tuning is located in the Technical/Reference thread. Great info!

The stealershipd isn't wrong. Bone stock, the bike is REAL cold blooded. It's running just how it was intended to run when it left the factory.

Title: Re: lurching problem
Post by wifes bike on 07/11/08 at 21:30:34

you mean with it all the way out or half
:-? but its warm enough here that it don't need hardly any chocking to get it running if the choke is out after it fires you have to push the choke in or it wont start

Title: Re: lurching problem
Post by wifes bike on 07/11/08 at 21:32:18

hmm i've checked the carbs no visible adjustment other than cable and idle

Title: Re: lurching problem
Post by wifes bike on 07/11/08 at 21:33:53

is it inside the carb or something

Title: Re: lurching problem
Post by Dj12midnit on 07/11/08 at 21:34:51

You will have to pull the brass plug.

Title: Re: lurching problem
Post by wifes bike on 07/11/08 at 21:39:20

is that the little brass thing on thr left side looks like an 1/8 in across
what is that adjuster called anyways and how do you get it out

Title: Re: lurching problem
Post by skrapiron on 07/11/08 at 21:43:40

Go to the tech/reference section. They have all the answers to all of your questions AND they even have pictures for you to reference! Great stuff!

Title: Re: lurching problem
Post by wifes bike on 07/11/08 at 22:38:15

ok i got it had to do some looking but found it any ideas on how to remove the brass plug from the pilot screw [smiley=dankk2.gif]

Title: Re: lurching problem
Post by Dj12midnit on 07/11/08 at 22:59:15

Drill bit screw and viceGrips

I think there is a write up in the tech section.

Title: Re: lurching problem
Post by verslagen1 on 07/11/08 at 23:34:53

white spacer mod will fix it

Title: Re: lurching problem
Post by rigidchop on 07/12/08 at 04:58:29

could also check the vent hose from the petcock to the carb make sure it has a clamp on both ends, mine did the same thing.

Title: Re: lurching problem
Post by Charon on 07/12/08 at 06:21:42

The description of lurching at low speeds, but running fine at higher ones makes me wonder if you are running at low speed in too high a gear, say 25 mph in fifth. the Thumper doesn't much like that. If the engine is cold it likes it even less. Mine will let me get away with 25 in 4th, if the engine and day are warm, but it would really prefer 3rd at that speed.

Title: Re: lurching problem
Post by barry68v10 on 07/12/08 at 17:41:21

If your bike is surging at about half throttle, the white spacer mod is for you!

Title: Re: lurching problem
Post by barry68v10 on 07/12/08 at 17:42:55

That is the problem provided your not "lugging" the engine, which is trying to ride with the engine below about 2000 rpms.

Title: Re: lurching problem
Post by Jay on 07/12/08 at 22:25:53

I had exactly the opposite problem. My lurching, I discovered, was from running in to low a gear. I tried going 40 - 45 in third only to have the bike seem to be really struggling against it. Upshift to fourth, and the engine smoothed out, without lugging.

Title: Re: lurching problem
Post by Charon on 07/13/08 at 05:48:29

I have an article from a 1996 road test of the Savage claiming there is a 6500 rpm rev limiter in the ignition. Wonder if 40-45 mph in 3rd might be running up against that?

Title: Re: lurching problem
Post by wifes bike on 07/13/08 at 07:27:18

;) ok guys its not lugging hehe thats for cool harlys ;)lol. 1 st gear form 5 - 15 mph it lurches and the other gears the same thing at same rpm. i did the A/F adjustment and no more backfireing thanks for that info but still lurching. i geuss i'm up for the white spacer mod next ,let me get this straight. need to thin the spacer or use 3mm washers that are thinner than the white spacer correct. i'm going to go ahead and do the valve adjustment while the tank is off also , you guys are right the tech part is a sorce packed with all kinds on useful info . could and have spent hours looking through that stuff , like a big bowl of savage candy ;D .
hey its cool that i'm not the only one who thinks the dealership sucks ,(stealership) it fits . the 600 mile service was supose to involve checking everything listed in the manuel stuff like check valve clearance, spark plug ,check touque on all bolts, air pressure ,oil change and the list goes on. ok they had it for about 30 min lol [smiley=angry.gif][smiley=thumbdown.gif] ,, asked me if i wanted to wait SHOCK man i've never put a bike in the shop that didn't take at least an overnight stay .they can't tell me they did all that or half of it in that time no more stealership for me all i need in this forum you guys rock those guys need to study this forum lol [smiley=thumbsup.gif] i'll let you guys know how the spacer thing goes when i get around to it
thanks again ;D