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Bike problems, requesting diagnosis/suggestions. (Read 100 times)
eviaris
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Bike problems, requesting diagnosis/suggestions.
07/29/08 at 19:19:20
 
Hi all, below is a thorough description of some of the problems I've been having with my new Savage.  I would love this bike if I could actually ride it.   Sad

Any help or suggestions on how to fix the problems would be greatly appreciated! I plan on taking it to a mechanic as soon as I can afford for somebody to take it, but I would like to know what may or may not be the problem before throwing down a bunch of cash on it, or even if it's worth it.

PREVIOUS PROBLEMS:
So, I bought a 2001 Suzuki Savage on Craigslist...

As soon as I bought it, I filled it up and headed home.  After about 25 miles of 70 mph interstate riding, it started sputtering and backfiring so I pulled over.  It never shut off completetly, and I began again.  Upon reaching ~70 mph again, it did the same thing and completely stopped combusting as I pulled over. I then decided to keep the speed below 65 just to get home, and it ran fine the rest of the way.  

As soon as I could, I brought it to a mechanic to get a 4000 mi tune-up and a diagnosis of the problem.  They completed the tune-up, and said the problem was probably just dirty and/or stale fuel.  They recommended I use some fuel cleaner.

I continued to drive it to work (15 mi one way) for little over a week, with a few occurences of the same problem. I take it to a friends who has mechanical experience and is willing to take a look at it.  We drained the fuel, which seemed clean and proceeded to drain the carburetor bowl.  Ah hah! There was a separate bubble of liquid sitting at the bottom of the cup about a centimeter in diameter and about 2-3 mm thick. I attempt to ride it around for a few minutes reaching 80 mph and never having a problem.  I eventually leave to return home.

CURRENT PROBLEMS:
I attempt to stay going 75 mph on the interstate for about 40 min, which is most of the way home.  No problems.  The first time I have to slow down and speed back up was to merge onto a different interstate.  As soon as I roll back onto the throttle, it lugs and backfires but then jerks back to normal speed.  It does it again when accelerating out of another turn.  I eventually make it home and shut it down.

The next morning, I go out, put the key in an attempt to start it up.  Absolutely nothing happened.  No clicking noises, nothing.

The next day, I buy a cheap metric socket set so I can get to the battery.  The battery's electrolyte level is fine, so I attempt to push start it.  It starts on the second try.  I let it idle for a bit, and it sounded fine.  I rolled on the throttle in neutral a few times, and it felt and sounded fine.  I attempt to ride it down the road some, and every time I roll on the throttle more than about 10 degrees within half a second, it lugs, backfires quietly, and eventually jerks to that particular throttle level after about 1-2 seconds. It does the same in second gear.  If I accelerated extremely slowly, it would act normal.  For about 35 min, I switch between trying to ride it and letting it idle so as to charge the battery. I eventually shut it off, and immediately hit the start button. Nothing.
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« Last Edit: 07/29/08 at 20:41:40 by eviaris »  
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T Mack 1 - FSO
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Re: Bike problems, requesting diagnosis/suggestion
Reply #1 - 07/29/08 at 19:35:05
 
First,  the sputter sounds like it may be either a carb problem, or weak spark issue.  

You didn't say if the carb was cleaned,  you only said it was drained......  

Weak spark could be the battery, or a dirty plug, or a incorrectly gapped plug, or a bad sparkplug wire, or a spark resistor that has seen better days.

The sputter at speed could also be a vacuum leak in the fuel petcock system.  The hose can get loose thus letting air in and at speed the vacuum is lower..... which would shut off the fuel a bit.  By having people work on the bike they may have pushed the hose back on without even thinking about it....

EDIT:  Check the FREE things first.  

EDIT 2:   Not starting.....  Remember there are safetly interlocks......  they get the best of us  .....
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Re: Bike problems, requesting diagnosis/suggestion
Reply #2 - 07/29/08 at 19:54:04
 
The vacuum leak thing can be checked very easy, simply switch the petcock to PRI as soon as it starts and if it stops than it is a problem with the vacuum not holding the fuel on.  If it is a borderline thing then on a long steady cruise you could slowly be using more fuel than is coming thru the petcock and eventually starve out.

My Y2K was pulling that on my LA-OKC trip, and switching to PRI eliminated the problem.  City riding is not a problem as I am fully off the throttle almost as much as fully on.
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eviaris
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Re: Bike problems, requesting diagnosis/suggestion
Reply #3 - 07/29/08 at 20:54:32
 
Thanks for the help guys.

I did forget to mention that I placed about 1/2 a bottle of STP fuel injector/carburetor cleaner the day before I brought it to my friend's house, and I burned about 3/4 of the main tank's fuel with it before replacing the gas.

Also, earlier, after I push started it, I set the petcock to PRI with no change in idle activity or performance.  It still lugged, then jerked when attempting to accelerate.  

FYI, after it lugs/backfires/jerks, it will run at that steady speed fine as long as I don't accelerate, and I can roll hard on the throttle in neutral and it seems fine. It's only when attempting to roll on the throttle while in gear that causes symptoms.
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Re: Bike problems, requesting diagnosis/suggestion
Reply #4 - 07/29/08 at 21:30:36
 
Check the spark plug or carbon fouling. Max
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Max at Thumper Acres. '96 Savage bagger, '03 Savage w/Cozy sidecar for wifeni.
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Re: Bike problems, requesting diagnosis/suggestion
Reply #5 - 07/29/08 at 22:27:56
 
eviaris wrote on 07/29/08 at 20:54:32:
Thanks for the help guys.

I did forget to mention that I placed about 1/2 a bottle of STP fuel injector/carburetor cleaner the day before I brought it to my friend's house, and I burned about 3/4 of the main tank's fuel with it before replacing the gas.

Also, earlier, after I push started it, I set the petcock to PRI with no change in idle activity or performance.  It still lugged, then jerked when attempting to accelerate.  

FYI, after it lugs/backfires/jerks, it will run at that steady speed fine as long as I don't accelerate, and I can roll hard on the throttle in neutral and it seems fine. It's only when attempting to roll on the throttle while in gear that causes symptoms.

That stuff is for a car, so full bottle for an 14 gal tank.  And you put 1/2 in a 2 gal tank?  way over did it.  What is it 6 oz's? 1 oz per gal would be my guess.

BTW, had a 2stoke 125cc bike.  used to have to clean the plug every so often.  then started using 'gas miser' about an oz in 1 gal tank.  stopped having to clean the plug afterward.
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Re: Bike problems, requesting diagnosis/suggestion
Reply #6 - 07/30/08 at 05:16:53
 
Have you checked the battery voltage?
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eviaris
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Re: Bike problems, requesting diagnosis/suggestion
Reply #7 - 07/30/08 at 07:04:43
 
I need to pick the tools to check the voltage.  I plan on doing that today.

As for the carb cleaner, I read here that it wouldn't hurt to put half a bottle in it if it's the first time in a while, so I did.  And, the gas was replaced the day after.
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