Welcome back to us :/ Our hosts data center was down for the entire day.
MotoHouston.com MotoHouston.com
Register Members List Member Map Media Calendar Garage Forum Home Mark Forums Read

Go Back   MotoHouston.com > General Discussion > General Discussion (Moto Related)
Forgot info?

Welcome to MotoHouston.com! You are currently viewing our forums as a guest which gives you limited access to the community. By joining our free community you will have access to great discounts from our sponsors, the ability to post topics, communicate privately with other members, respond to polls, upload content, free email, classifieds, and access many other special features. Registration is fast, simple and absolutely free, join our community!

Register Today!

If you have any problems with the registration process or your account login, please contact us.


FREE MH Decals by MAIL!

Advertisement

Reply
Share This Thread: 
Subscribe to this Thread Thread Tools
Old 04-23-2012, 04:40 PM   #1
xtelevisionset
Think Fast
 
xtelevisionset's Avatar
 
Join Date: Mar 2012
Feedback Rating: (0)
Posts: 763

Experience: 3 years

Bike(s):
Suzuki GS500 2002









GS500 Running Smoother After Loud Backfire

Hey guys, my bike is a GS500.

I've been having a lot of pinging issues around 2000rpm while warming up. My manual says to use 89 octane and I can't reach top speed on premium so I try to use 89.
I think my last tank of 89 was not of the best quality and really was making me worry about my engine grenade-ing soon and having to sell my bike before this happened.

It was getting a LOT of ping, much more than usual.

So I grabbed a bottle of GUMOUT carburetor cleaner and switched to Mobil 1 high mileage synthetic oil (these babies burn through oil like nothing else so replacing the oil doesn't take much effort). Then, I put a gallon of premium in the tank so the mixture is now 3 gallons of 89 Chevron and a gallon of 93 Kroger with 1/3 bottle of GUMOUT.
Rode 20 miles into Houston and didn't notice any difference in performance on the way and was still very worried about my engine blowing.

After 2 days of sitting, I cranked her up again last night.


Here is where it gets interesting.

When I cranked the engine, there was a massive backfire on start up that must have sounded similar to a gunshot. My bike was now idling perfectly at 2k rpm (something it has never done ever since I got it) without any pinging. It also sounded significantly louder and more bad . While riding, I noticed a very huge difference in sound and performance. My bike is running smoother than ever and the exhaust note sounds very good and resonant.


Does anybody here have any idea what may have happened?
I've never been so satisfied with my bike's performance.
__________________
wellearnedrestbydaniel2
And I'm saying nothing in the past or future ever will feel like today

Until I'm parking in an ally just hoping that my is safe.

Last edited by xtelevisionset; 04-23-2012 at 04:43 PM.
xtelevisionset is offline   Reply With Quote
Similar Topics
Thread Thread Starter Forum Replies Last Post
Smoother ride minus front fairing? Remcycle General Discussion (Moto Related) 14 09-30-2012 03:09 PM
Good deal? Running '93 GS500 for $750? jacob General Discussion (Moto Related) 12 12-20-2009 12:32 PM
How loud is too loud for exhaust?? T 2 da P General Discussion (Moto Related) 42 10-23-2009 05:06 PM
Backfire Duck84 General Discussion (Moto Related) 18 05-22-2008 07:53 AM
Loud backfire on morning startup Greg in H-town How To's and Q & A's 6 02-22-2007 12:47 AM
Advertisement
Old 04-23-2012, 04:42 PM   #2
1308cc
954 isn't a liter
 
1308cc's Avatar
 
Join Date: May 2011
Location: West Side/Katy
Feedback Rating: (0)
Posts: 631

Experience: 5 years

Bike(s):
04 Honda VFR800
2006 Honda CBR 1000RR(Wrecked)
2002 Honda CBR 954RR (sold)
2006 Suzuki GS500F (sold)
2010 Yamaha FZ6R (sold)

Member Garage





UHHH...CONGRATS?
__________________
Noel Aviles
1308cc is offline   Reply With Quote
Old 04-23-2012, 04:47 PM   #3
chevy42083
Senior Member
 
chevy42083's Avatar
 
Join Date: Mar 2011
Location: Katy
Feedback Rating: (0)
Posts: 1,932

Experience: 2 years

Bike(s):
'09 XB12scg
'07 650r Stolen/recovered








Something was clogging the exhaust and choking up the motor?


lol, BTW, remind me to never buy a bike from you.
"really was making me worry about my engine grenade-ing soon and having to sell my bike before this happened."
__________________
-Duane
chevy42083 is offline   Reply With Quote
Old 04-23-2012, 04:47 PM   #4
JBIRD5363
Senior Member
 
JBIRD5363's Avatar
 
Join Date: Apr 2008
Location: H-TOWN
Feedback Rating: (2)
Posts: 3,179

Experience: 2 years

Bike(s):
01 50
85 Honda atc 250 sx
95 dr 650







If I had to guess you either broke a huge chunk of carbon buildup loose or you knocked a chunk of loose from your carb and it's now running right. Next tank find some bg supercharge it blows that other stuff out of the water.
__________________
Quote:
Originally Posted by El Pachuco View Post
a sniper will and himself to successfully complete his mission. if you can't do the same to complete your ride, you're not much of a biker.
JBIRD5363 is offline   Reply With Quote
Old 04-23-2012, 04:50 PM   #5
DLite
David
 
DLite's Avatar
 
Join Date: Jul 2010
Location: Woodlands
Feedback Rating: (1)
Posts: 1,479

Experience: 10+ years
Trackdays: 10+

Bike(s):
'06 Triumph D675
'03 R6 (Track)
'07 HD Street Bob







Check your intake and air filter.
DLite is offline   Reply With Quote
Old 04-23-2012, 05:01 PM   #6
xtelevisionset
Think Fast
 
xtelevisionset's Avatar
 
Join Date: Mar 2012
Feedback Rating: (0)
Posts: 763

Experience: 3 years

Bike(s):
Suzuki GS500 2002









My guess was either I blew the cat to pieces or blew some carbon build up.
I always figured the pinging was due to engine damage from the previous owner because my bike doesn't have a rev limiter.

Gonna check the intake in a couple mins and pick up my filter from Autozone down the street soon.

Carbs were pretty clean last time I took it apart, bout a thousand miles ago.

Perhaps if there was engine damage, the material in the high mileage oil may have possibly helped, though my clutch is a tad more friction-y.

I really like this bike and was crying about giving it up, but was planning on nabbing another 500, maybe a ninja 500 or a cb500.

Now, I dunno. Gonna ride her 'til she bucks no longer probably.
__________________
wellearnedrestbydaniel2
And I'm saying nothing in the past or future ever will feel like today

Until I'm parking in an ally just hoping that my is safe.
xtelevisionset is offline   Reply With Quote
Old 04-23-2012, 05:38 PM   #7
Patrick
Motorcycles Unlimited
 
Join Date: Jun 2005
Location: Houston
Feedback Rating: (2)
Posts: 16,368

Experience: 10+ years
Trackdays: 10+

Bike(s):
'14 Speed Triple R, '82 CB900F, '13 Streetglide






Probably cleaned the low speed circuit a bit while it sat up with the Gumout in it.
The backfire doubtfully did anything.
2000 rpm idle is hogh though, I recommend lowering it to 1300.
When was your last valve adjustment?
__________________
Call or PM for the BEST PRICES in Houston for PARTS and ACCESSORIES.
MAKE SURE TO MENTION YOU'RE ON MH TO GET THE BEST PRICE!

NEED GEAR? We have a great selection in stock but if we need to order it we GUARANTEE FIT!
Where Houston riders go to have their bikes worked on, done right the first time!


muad

1964 FM 1960 West
Houston, TX 77090
Hours: Tues.-Fri. 9:30-6:00 Sat. 9-5:30
www.motorcycles-unlimited.com
http://www.facebook.com/motorcyclesunlimited
e-mail: patrick@motorcycles-unlimited.com
Patrick is offline   Reply With Quote
Old 04-23-2012, 05:43 PM   #8
Pachuco
So fly, I need feathers
 
Pachuco's Avatar
 
Join Date: Mar 2009
Location: Houston (Proper)
Feedback Rating: (6)
Posts: 3,823

Experience: 6 years
Trackdays: 10+

Bike(s):
1098s
S4RS
SC1000
999s
996 sps

Member Garage





Send a message via Yahoo to Pachuco
Quote:
Originally Posted by chevy42083 View Post
Something was clogging the exhaust and choking up the motor?


lol, BTW, remind me to never buy a bike from you.
"really was making me worry about my engine grenade-ing soon and having to sell my bike before this happened."
you beat me to it. I can't wait for this for sale thread... EPIC
__________________
Stuntin like Jet Li, boat houses and jet ski's
Pachuco is offline   Reply With Quote
Old 04-23-2012, 05:44 PM   #9
xtelevisionset
Think Fast
 
xtelevisionset's Avatar
 
Join Date: Mar 2012
Feedback Rating: (0)
Posts: 763

Experience: 3 years

Bike(s):
Suzuki GS500 2002









Quote:
Originally Posted by Patrick View Post
Probably cleaned the low speed circuit a bit while it sat up with the Gumout in it.
The backfire doubtfully did anything.
2000 rpm idle is hogh though, I recommend lowering it to 1300.
When was your last valve adjustment?
Oh, I have to idle at 2k for warm up with choke engaged.

Sits at 1250-1350 normally and 1500 after spirited rides.

I checked my valves a thousand miles ago and they're all in spec, but tappets may need a changing within the next couple thousand miles. I would like to do this myself, but can't seem to figure out how to remove them.

I used to use Gumout all the time for a while. Would smooth out the engine and give me better gas mileage, but I just got lazy and stopped going inside gas stations. Never solved the pinging significantly though.
__________________
wellearnedrestbydaniel2
And I'm saying nothing in the past or future ever will feel like today

Until I'm parking in an ally just hoping that my is safe.
xtelevisionset is offline   Reply With Quote
Old 04-23-2012, 07:08 PM   #10
xtelevisionset
Think Fast
 
xtelevisionset's Avatar
 
Join Date: Mar 2012
Feedback Rating: (0)
Posts: 763

Experience: 3 years

Bike(s):
Suzuki GS500 2002









Don't wanna call myself clean just yet.

Gonna run this tank dry, fill up with 2/3 89 and a 3rd premium from now on and not add anymore gumout.

Airbox is fine and filters have been swapped.

I hope it stays running this way for at least 5k miles.

Going to dump this oil soon too and put on a new filter.

Fingers crossed.
xtelevisionset is offline   Reply With Quote
Old 04-23-2012, 08:16 PM   #11
bluewave18
Safety Third
 
bluewave18's Avatar
 
Join Date: Oct 2007
Location: S.E.
Feedback Rating: (0)
Posts: 34,126

Experience: 10+ years

Bike(s):
08 Busa
03 XR 50








You probably blew the carbon off of the valves
bluewave18 is offline   Reply With Quote
Reply


Thread Tools

Advertisement


All times are GMT -5. The time now is 09:43 PM.


MotoHouston.com is not responsible for the content posted by users.
Privacy Policy