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Message started by JutMan on 06/29/15 at 08:42:06

Title: Weird throttle issue...
Post by JutMan on 06/29/15 at 08:42:06

OK, going to try to give as much details as I can, i hope this makes sense. I have already drilled out the little plug and made that adjustment. I have replaced the jets in the lower 1/2 of the carb. I have not yet done anything with the top side of the carb yet.

When i start the bike, 2005 S40, the idle is a bit lower as things are running a bot cool. If i roll the throttle a bit off of idle, it starts crapping out. To the point where the bike can complete die and has to be restarted. If i roll the throttle past that point everything runs normal.

After she warms up, idle is faster than when cool, and rolling the throttle is more normal.

Thoughts?

Title: Re: Weird throttle issue...
Post by Dave on 06/29/15 at 08:48:34

It sounds like the engine is running a bit on the lean side....nothing unusual about that in this EPA controlled world. My Kawasaki Super Sherpa was so lean from the factory that you had to let it warm up a full 10 minutes before you could even begin to ride the bike (larger pilot jet cured that!).

You replaced the jets....What did you replace them with?

When you say you "made that adjustment"....what do you mean? You turned the screw.....or you actually "adjusted" it?

https://www.youtube.com/watch?v=zm5mB3R8Ucw

[media]http://www.youtube.com/watch?v=zm5mB3R8Ucw[/media]

Title: Re: Weird throttle issue...
Post by Gary_in_NJ on 06/29/15 at 08:54:34

7847467F535C320 wrote:
OK, going to try to give as much details as I can, i hope this makes sense. I have already drilled out the little plug and made that adjustment. I have replaced the jets in the lower 1/2 of the carb. I have not yet done anything with the top side of the carb yet.

What adjustment? What jets did you install?

7847467F535C320 wrote:
When i start the bike, 2005 S40, the idle is a bit lower as things are running a bot cool. If i roll the throttle a bit off of idle, it starts crapping out. To the point where the bike can complete die and has to be restarted. If i roll the throttle past that point everything runs normal.

After she warms up, idle is faster than when cool, and rolling the throttle is more normal.

Thoughts?

You should adjust the carb to run properly at normal operating temperature. When cold are you running it on or off choke?

We need more details about your jets, tuning and atmospheric conditions. What you describe could be a small adjustment...or completely normal.

Title: Re: Weird throttle issue...
Post by Serowbot on 06/29/15 at 09:16:41

Sounds like you need to use the choke... :-/...

Cold engine stumble is normal,.. that's why engines have chokes...

Title: Re: Weird throttle issue...
Post by verslagen1 on 06/29/15 at 09:30:19

remember, give the guy a chance to reply or else we're inventing issues.

Title: Re: Weird throttle issue...
Post by justin_o_guy2 on 06/29/15 at 11:14:42

After I did the cam, Supertrapp, jets, I hadda adjust the idle up when first started, then, as it came to operating temps, adjust idle. Its not aproblem. Knurled knob, easy, Its just a biggo lawnmower motor. If some minor tinkering needs done to satisfy its needs, no biggee.

BUT, before you decide to accept it as is, do what these guys say. They Really know how the carb works. My pilot jet was stuck and I decided to just go with it..

Total miles on the bike is always good to share, what with the cam chain and all.

Title: Re: Weird throttle issue...
Post by JutMan on 06/30/15 at 10:13:46

Had to go back to ebay to find the jets..
I like in Eastern, PA for the location in the Poconos.

Main Jet: #150
Pilot Jet: #55 BS30/96

I adjusted the screw out about 1.5 turns then maybe a bit more. This was all done to try and eliminate the backfire, but she still backfires on shutdown and a bit when decelerating. I also forgot to mention that I also replaced the muffler with a Dyna as recommended.

I have never tried to ride with the choke pulled.

Title: Re: Weird throttle issue...
Post by Gary_in_NJ on 06/30/15 at 10:39:03

A 55 pilot and 1-1/2 turns out a fairly rich for the idle circuit. I'd start by screwing the screw in by 1/4 turn increments until the situation improves to your liking. If you're less than 3/4 turn, consider putting the stock 52.5 back in.

No matter how you mess with the jetting you'll never get rid of the afterfire. Learn to love it.

Title: Re: Weird throttle issue...
Post by JutMan on 06/30/15 at 11:13:07

757F7B717A73777E202622120 wrote:

I love the backfire, gets a bit of attention and the wife knows when I am home :) I will let it warm up before trying the 1/4 turns. I do not think that I let it warm up before when I set it.

Title: Re: Weird throttle issue...
Post by justin_o_guy2 on 06/30/15 at 11:26:57

Go downtown, adjust at lights.

Title: Re: Weird throttle issue...
Post by JutMan on 07/02/15 at 04:37:21

Adjusted the screw full in and then out 1.5 turns to start a baseline. I think it may have worked it's way out a little from the last adjustment. I had to turn it in about 2 full turns to begin screwing it back out.