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Message started by dabid on 04/27/13 at 16:31:17

Title: Engine Dies when I come off the throttle
Post by dabid on 04/27/13 at 16:31:17

Hey guys,

I tried to search but couldnt find anything, so here goes...

I rejetted last week, I am running a 52.5 pilot and 150 main. about to put on a K&N pod filter.

The engine is pulling strong, but when I come off the throttle to start braking, the engine just dies. I can feather the throttle as I slow down, but it still slows down to what seems like 200-400 RPMs. Then it will speed up back to proper idle.

I am guessing I need to step up the pilot jet to maybe a 55 and a 152.5 main.

What do you guys think?

thanks

Title: Re: Engine Dies when I come off the throttle
Post by verslagen1 on 04/27/13 at 16:41:44

Clean the TEV valve.

and check your idle speed, it's probably too low.

Title: Re: Engine Dies when I come off the throttle
Post by dabid on 04/27/13 at 17:01:57

352631302F2224262D72430 wrote:

Clean the TEV valve.

and check your idle speed, it's probably too low.

Whats the TEV valve?

and it actually slows down to an RPM much lower than my idle, then it speeds up to the idle RPM

Title: Re: Engine Dies when I come off the throttle
Post by apache snow on 04/27/13 at 17:06:24

Raising the needle some may help. I know the needle is for mid-range but there is some overlap to the idle circuit.

How many turns out do you have the pilot fuel screw?

Title: Re: Engine Dies when I come off the throttle
Post by dabid on 04/27/13 at 17:10:35

322332303B36203D3C24530 wrote:

Raising the needle some may help. I know the needle is for mid-range but there is some overlap to the idle circuit.

How many turns out do you have the pilot fuel screw?

Screw is out 2 1/4 turns.

I have done the white spacer mod, replace with 3 washers.

Maybe I need to remove one, bring it down to 2 washers.

Title: Re: Engine Dies when I come off the throttle
Post by apache snow on 04/27/13 at 17:13:53

Try turning the screw out some more. If you have to go more than three turns then going to a 55 pilot will help. What elevation are you at.

Changing the pilot jet is a lot easier than taking out a washer.

Title: Re: Engine Dies when I come off the throttle
Post by verslagen1 on 04/27/13 at 17:17:57

4C494A414C280 wrote:

[quote author=352631302F2224262D72430 link=1367105478/0#1 date=1367106104]Clean the TEV valve.

and check your idle speed, it's probably too low.

Whats the TEV valve?

and it actually slows down to an RPM much lower than my idle, then it speeds up to the idle RPM[/quote]

#15

http://suzukisavage.com/images/uploaded/Mikuni_101web.jpg
I think we've narrowed down that symptom to a dirty TEV valve but could be something else.

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1267767908

I wouldn't get into mod's on this thing... to easy to go wrong and replacement parts not easily available.

Title: Re: Engine Dies when I come off the throttle
Post by dabid on 04/28/13 at 05:26:55

4958494B404D5B46475F280 wrote:

I am about 1000 ft above sea level. Ill try turning the screw out, and if that doesn't work then Ill bump up the pilot jet to 55

Title: Re: Engine Dies when I come off the throttle
Post by Jacob on 04/28/13 at 07:07:06

I am at about 800ft elevation and a 55 pilot is too rich for me. I am running 52.5 pilot and a 150 main with the 3 washers on the needle. My bike was running the same exact way. It took me a few days but now it's running strong and no dipping under idle or stalling. It's your TEV valve. Clean it and add a washer in there if need to. I ended up having to add 2 small skinny washers . I took that TEV valve cover off at least 6 times just trying different sizes of washers till the last test ride when it didn't dip under idle anymore and no backfiring on decel. Good luck.

Title: Re: Engine Dies when I come off the throttle
Post by dabid on 04/28/13 at 07:37:29

12393B373A33372A3C3D2B580 wrote:

ok, ill give the TEV a good clean, see what happens.

Do you know what size those washers are by chance?

thanks everyone

Title: Re: Engine Dies when I come off the throttle
Post by Jacob on 04/28/13 at 10:17:23

There is a mod in the tech section of this website that you might want to check out. It's about adding a washer to the TEV valve to add alittle more tension to the spring. When I had only the spring in there it would drop below idle and almost stall sometimes and when I added a washer it wouldn't drop idle but it would backfire on decel real bad... It was some loud popping, crackling and backfiring... But I kept playing with it and I found the right tension for the valve. I didn't put the 2 small washers on the TEV cover, I put them in where the spring sits in the valve. It added the right amount of tension and now no backfiring on decel and steady running with no dipping under idle. Good luck, hope I helped.

Jacob

Title: Re: Engine Dies when I come off the throttle
Post by dabid on 04/28/13 at 11:16:03

4962606C61686C71676670030 wrote:

Huge help, Jacob. Thanks for taking the time to explain it.

I will have time to work on the bike during the week, so ill be sure to update the thread.

Thanks again

Title: Re: Engine Dies when I come off the throttle
Post by LANCER on 04/28/13 at 16:21:41

When you clean the TEV be sure to blast the tiny holes in the carb body going in and out to that valve with a can of carb spray and use the tiny red tube that comes with it so you get a good pressure spray of the cleaning fluid in the holes. If those holes are not clear then the TEV will not work properly.
Get this done before you change any jets and you can see how it responds.

Title: Re: Engine Dies when I come off the throttle
Post by luckylouie82 on 09/04/14 at 11:48:29

I know this post is old, but OP never did reply to say if TEV was the fix. His symptoms sound nearly identical to the issues I'm having. I've chased idle speed, idle mixture, vacuum leaks, Raptor petcock. All given attention, all dead ends.

The responsiveness of the carbs seem great otherwise. acceleration is responsive, idles fine. Just during decel will the bike dip below idlespeed. and unless I blip the throttle will die.

So I'll try TEV next. Is it possible to only remove TEV and keep rest of the carb intact and on the bike?

Title: Re: Engine Dies when I come off the throttle
Post by justin_o_guy2 on 09/05/14 at 14:20:39

Take care. That stuff is not a good eyewash. Like Brylcream,a little dab'l do ya. And breathing it is not a great idea either. I inhale,shoot,leave and exhale. I don't care about the time it takes. I use a fan,too.

Title: Re: Engine Dies when I come off the throttle
Post by luckylouie82 on 09/10/14 at 08:43:03

UPDATE: Well, the TEV cleaning really helped. The "symptom" of the idle dropping has not completely gone away. But it is much less noticeable, especially when the bike is warm. And the bike has not died once. Maybe the pilot jet is a little gunked up too, but I'm happy with the results of the TEV cleaning tip. Thanks forum.