Donate!
Welcome, Guest. Please Login or Register :: View Members
Pages: 1 2 
Send Topic Print
All Current TEV Discussion goes here (Read 929 times)
Tom Dooley
YaBB Newbies
*
Offline

SuzukiSavage.com
Rocks!

Posts: 25
South Louisiana
Gender: male
All Current TEV Discussion goes here
10/09/11 at 18:20:12
 
Warning:    Please read the entire thread before trying anything.   There are two TEV threads here in Tech Section, neither of which shows a consistent successful method for all mods/bikes -- your mods and jetting STRONGLY affect what the TEV adjustments actually do on your bike.

If you want to read the original locked thread on this topic, go here.

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1268545171



=============================



I just found an interesting thread on the below Suzuki Intruder/Volusia owners link:

http://www.intruderalert.com/cafe/index.cfm?page=topic&topicID=50668

This topic details and illustrates putting a 1/4" washer in the TEV housing to put slightly more pressure on the TEV diaphram. Article suggests the engine dying on decel and the decel backfiring are caused by the stock TEV enriching the fuel flow too much. The Suzuki Volusia twin has two TEVs and Volusia owners have been complaining of the same problem as our Savage owners. All of the people who made this mod reported it cured this engine dying problem. I inserted the washer on my Savage TEV today. This is an opposite mod compared to cutting the spring. I have made several test runs today and so far no further engine dying on decel. Will test this mod further.
Back to top
 
« Last Edit: 07/14/12 at 21:25:24 by Oldfeller »  
  IP Logged
verslagen1
YaBB Moderator
ModSquad
*****
Online

And Though She Be
But Little She is
Fierce!

Posts: 25651
L.A. California
Gender: male
Re: Motor killing on decel - backfiring
Reply #1 - 10/09/11 at 18:42:57
 
Great Mr dooley you've found another answer.
I'll add this to the TEV valve technical.

so here we have it,

Backfire... shorten the spring
Dieing at stop... lengthen it.
Back to top
 
 

WWW   IP Logged
Tom Dooley
YaBB Newbies
*
Offline

SuzukiSavage.com
Rocks!

Posts: 25
South Louisiana
Gender: male
Re: Motor killing on decel - backfiring TEV fix2
Reply #2 - 10/09/11 at 18:51:45
 
Actually both dying and backfiring on my bike has stopped. After completely going through the carb this little mod was simple to try and at the same time I converted to Allen head M4 screws. And it seems to work. Might just be the weather today. Wink
Back to top
 
 
  IP Logged
spacepirates
Serious Thumper
*****
Offline

Igni Ferroque

Posts: 515
Pittsburgh, PA
Gender: male
Re: Motor killing on decel - backfiring TEV fix2
Reply #3 - 10/10/11 at 17:56:53
 
I've got the backfires real bad, and my bike stumbles on decel. You can hear it try and catch back up after you stop, kinda like catching its breath.

While I was working on my bike tonight I decided to take step one and "clean" (ha! i just shot carb cleaner around there...) the TEV to see if anything improves. I did notice gas sitting in there though. It was collected on the brass dish that holds the spring on the diaphragm. I'm guessing either that is normal or my TEV is too rich...
Back to top
 
 

--
Only a biker knows why a dog sticks his head out of a car window.
  IP Logged
SurfJunkie
Junior Member
**
Offline

SuzukiSavage.com
Rocks!

Posts: 66

Re: Motor killing on decel - backfiring TEV fix2
Reply #4 - 10/11/11 at 11:43:48
 
Just did this on my bike while on lunch at work.

I had a big tipped tight fitting phillips head screw driver. Screws came out with 0 issues/stripping.

The 1/4" washer i had would not fit on my TEV cover. I opted to put it in the metal cup of the diaphram ( where the spring sits anyway, essentially serving the same function as on the cap just without me needing to mod it. )

Took her for a test drive. VERY HAPPY ! I now only get 1 little pop every 15-20 throttle chops, rather then a solid kaboom every time i chop it.

Well worth the 5 seconds it took me to do.

I can also confirm i saw a little bit of fuel in the TEV diaphragm cap
Back to top
 
 
  IP Logged
baker87
Junior Member
**
Offline

ridin since 06

Posts: 84
venus tx
Gender: male
Re: Motor killing on decel - backfiring TEV fix2
Reply #5 - 10/11/11 at 14:02:37
 
i talked to a buddy of mine... he said it is a combo of things, first being carb not metered and jetted properly... second the pilot air in the carb bowl needs to be upsized..... about 62.5.... and the pilot air in the slide diaphragm needs to be upsized.... no more backfire...
Back to top
 
 

ride hard/live hard
  IP Logged
arteacher
Serious Thumper
*****
Offline

Ride as if your
naked and invisable!

Posts: 2581
London ontario
Gender: male
Re: Motor killing on decel - backfiring TEV fix2
Reply #6 - 10/11/11 at 16:01:39
 
Did this mod yesterday and took it out for a couple of hours today No backfires at all, just a few pops when backing off the throttle. Also the rpms do not take a dive anymore when letting off the throttle.
I am a happy camper. Smiley Smiley Smiley
Back to top
 
 

white '07, Raask exh, Corbin seat, slipstreamer shie, Raptor, Routy's fwd controls, Baron tach, Frisco bars, Isogrips, Headlight and taillight modulators, Dial-a- jet, AME 9 deg chop kit, K&N air flt
  IP Logged
Tom Dooley
YaBB Newbies
*
Offline

SuzukiSavage.com
Rocks!

Posts: 25
South Louisiana
Gender: male
Re: Motor killing on decel - backfiring TEV fix2
Reply #7 - 10/11/11 at 18:36:44
 
The Volusia website states a 1/4" washer but I used a washer with a 5/16" ID and 11/16" OD and it fit perfect into the TEV housing. I had already converted to a .66" diaphragm spacer and backed out the idle air mixture 1/2" turn. I am running a stock exhaust and intake filter.
Back to top
 
 
  IP Logged
SurfJunkie
Junior Member
**
Offline

SuzukiSavage.com
Rocks!

Posts: 66

Re: Motor killing on decel - backfiring TEV fix2
Reply #8 - 10/12/11 at 10:51:28
 
Ive discovered that my backfires are not gone completely. I think my issue is im just running rich. Ive got an 87 and it likely has the 155 main as stock. Im gonna pull the crappy airbox and put on a cone filter, then take her for a 15-20 min ride, then pull the plug and have a look.  Oh the tuning fun begins.
Back to top
 
 
  IP Logged
LANCER
Serious Thumper
Alliance Member
*****
Offline

Savage Beast
Performance Parts

Posts: 9267
Oklahoma
Gender: male
Re: Motor killing on decel - backfiring TEV fix2
Reply #9 - 10/14/11 at 07:56:18
 
ah yes, tuning fun  Smiley
Back to top
 
 

  IP Logged
Tom Dooley
YaBB Newbies
*
Offline

SuzukiSavage.com
Rocks!

Posts: 25
South Louisiana
Gender: male
Re: Motor killing on decel - backfiring TEV fix2
Reply #10 - 10/20/11 at 17:55:20
 
I did some heavy riding today and was disappointed after the bike got warm and started to kill on decel. Just installed a tach and set the idle at 1250. Almost anytime I twisted the throttle a little when it came back to idle it would drop to 600-700 and almost die - sometimes actually dying. I removed the washer out of TEV housing and it did the same thing. I guess the next thing will be to try cutting the spring. I tried adjusting the idle mixture in both directions with no improvement. I am running at .062 spacer which I don't think even effects the idle. Stock exhaust and air filter.
Well, the good thing is, I needed a hobby and I sure have one now with this Mikuni  Wink
Back to top
 
 
  IP Logged
LANCER
Serious Thumper
Alliance Member
*****
Offline

Savage Beast
Performance Parts

Posts: 9267
Oklahoma
Gender: male
Re: Motor killing on decel - backfiring TEV fix2
Reply #11 - 10/21/11 at 10:26:11
 
Tom Dooley wrote on 10/20/11 at 17:55:20:
I did some heavy riding today and was disappointed after the bike got warm and started to kill on decel. Just installed a tach and set the idle at 1250. Almost anytime I twisted the throttle a little when it came back to idle it would drop to 600-700 and almost die - sometimes actually dying. I removed the washer out of TEV housing and it did the same thing. I guess the next thing will be to try cutting the spring. I tried adjusting the idle mixture in both directions with no improvement. I am running at .062 spacer which I don't think even effects the idle. Stock exhaust and air filter.
Well, the good thing is, I needed a hobby and I sure have one now with this Mikuni  Wink


Before cutting anything are you absolutely sure your carb is fully functional internally ?  
The drastic drop in rpm when returning to idle and the resulting delay in rpm recovery or engine stop, could be the result of dirty or clogged passageways inside the carb body.
You turned the pilot screw in both directions without effect and that indicates a clogged pilot circuit.  When working normally you will notice changes when adjusting the pilot screw.
This carb can be done in a day on your first teardown.  It is helpful to have the small impact driver that Harbor Freight sell for about $8...used on the tiny screws in the bottom of the slide that hold the needle in place.  Its good to have a bowl gasket on hand too.
There are some very small passageways that control fuel flow and if they are not clean & open the carb cannot work properly and respond to adjustment.
Once you know the carb is working properly then work on the mods if still needed.
Back to top
 
 

  IP Logged
Tom Dooley
YaBB Newbies
*
Offline

SuzukiSavage.com
Rocks!

Posts: 25
South Louisiana
Gender: male
Re: Motor killing on decel - backfiring TEV fix2
Reply #12 - 10/21/11 at 19:27:38
 
Thanks Lancer for the info. I bought this bike just a couple of months ago and it had the problem then. Two weeks ago I dissembled the carb for cleaning. All jets were removed and cleaned including the float and needle. I did not find anything clogged. It appeared this was the first time the carb was opened up. The carb body was dipped and all jets cleaned with a small copper wire and inspected. The TEV was clean also. The only thing the first owner had done was installed 3 washers (totaling .072") replacing the original white washer (.10"). I replaced the .072" spacing with a #4 nylon washer (.062"). At the time I replaced the phillips heads with allen heads. I have always used a 3/8" impact but I bought the Harbor Freight 1/4" for this project and it worked great except for 1 hard headed phillips which I had to use vicegrips on. It runs great except for the dying on decel. I can kick up the idle to 1500 and that helps but it should be able to idle at 1100-1200. If you have any further ideas I would surely appreciate. Thanks
Back to top
 
 
  IP Logged
LANCER
Serious Thumper
Alliance Member
*****
Offline

Savage Beast
Performance Parts

Posts: 9267
Oklahoma
Gender: male
Re: Motor killing on decel - backfiring TEV fix2
Reply #13 - 10/22/11 at 12:57:21
 
I find the brass jets themselves are less likely to clog before the passageways in the carb body itself.  The root cause of a majority of difficulties encountered in trying to tune a carb comes from cloged passageways.
The little brass tube that sticks down from the carb body into the float bowl about 1.5" has a very tiny hole that runs from the tip up into the carb body.  Just below the tip of that tube is also a tiny hole on each side.  Thats part of the pilot circuit and needs to be clear for proper function.
Another item is the needle jet.  With the main jet removed the NJ can be gently tapped out through the top.  It has quite a few tiny holes on the shaft that are usually clogged on an older bike/high miles.
Sudco sells a carb tool that is a small metal case with about a dozen tiny wires of the sizes needed to work on carb bodies.  They work better than any wire you can rustle up and the set is cheap.  The price is worth one clean & rebuild of a carb.  This way you know without question that everything is clear and flowing fuel and/or air.

Just some thoughts.  
Good tuning.  Wink
Back to top
 
 

  IP Logged
Tom Dooley
YaBB Newbies
*
Offline

SuzukiSavage.com
Rocks!

Posts: 25
South Louisiana
Gender: male
Re: Motor killing on decel - backfiring TEV fix2
Reply #14 - 10/22/11 at 18:05:22
 
Thanks for the carb info. When I went through the carb last week I did not take the needle jet out. I only removed the main jet and pilot and checked them. I remember blowing out the the tube that goes down in the float bowl. I am going to pull the carb again and make sure I clean the needle jet. When I first looked in I could not figure how to push the NJ out and hoped the carb cleaner soaking would do the job. I know something is not right in the idle circuit or TEV circuit for it to be dying when I "blip" the throttle. I will order the Sudco cleaner tool kit. I don't hesitate to acquire the right tools. Thanks again.
Back to top
 
 
  IP Logged
Pages: 1 2 
Send Topic Print


« Home

 
« Home
SuzukiSavage.com
12/13/18 at 22:04:33



General CategoryRubber Side Down! › All Current TEV Discussion goes here


SuzukiSavage.com » Powered by YaBB 2.2!
YaBB © 2000-2007. All Rights Reserved.