Question about 2005 Suzuki Boulevard C50

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2005 C-50 Suzuki Boulevard - A back fire occurs with the throttle open. Stock pipes never changed. One very loud backfire at about 30 mph winding/slowing down. No tach on board. Bike has only 4k miles and pipes look clean and hole free so far. Garage kept.

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For pollution control, the bike is equipped with a pair valve. It injects air into the exhaust to burn wasted fuel. Many companies sell block off plates to remove the pair valves since they are so annoying.

Posted on Jun 25, 2009

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Elimination of the PAIR valve and its hardware also makes valve adjustment much easier. I used the kit from Baron's:

http://www.baronscustom.com/catalog/display/321/index.html

Posted on Oct 11, 2011

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Boulevard backfires and dies.


check for problem coil/s and ignition control module
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My bike back fires bad the fuel pump and two of the injectors have been changed. What could be causing this problem


timing off
valves too tight
too lean
TPS bad
chipped valve, bad valve seat, cracked exhaust pipe sucking air in and igniting.
any # of things can cause backfire.

BE VERY SPECIFIC AND AS DETAILED AS YOU CAN ABOUT WHEN AND HOW THE BACKFIRING IS TAKING PLACE!

when is it backfiring? accel? decel? constant throttle position?
is there ever a point when it is not backfiring?

Jun 17, 2015 | 2006 Suzuki Boulevard C50

1 Answer

Backfiring on triumph st sprint 1999


After-market exhaust system or stock?

A lot of after-market mufflers don't cover up a backfire pop on over-run in the way that the stock system does. Look at The Marble Mod on GIXXER forums for ways to doctor the bike's emissions system to stop the popping.

Another cause of an over-run backfire may be a slight leak where the header pipes emerge from the cylinder head. Check the bolts are tight. Consider new copper washers.

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1 Answer

I took off the factory mufflers on my suzuki m50 that is fuel injected and put straight pipe on it. Drove it for awhile and now it wont run unless the air cleaner is off. How can I adjust it?


There is no adjustment on the fuel injection model unless you put it on a computer and have it remapped.

When you put straight pipes on the bike, you did away with a baffle that was in your stock pipes.
so now there is no back pressure, and your bike is breathing now.
But it can't breath if it can't get the air.
When you remove the air cleaner it breaths.
So you need to purchase a High-Flow air filter.
If you have an airbox, you may need to eliminate that as well, but start with just the high flow fliter first.
When putting on straight pipes and a high flow air filter , you will also need to increase your carburetor main jet size at least 1-2 numbers:example:stock 120 go to 122.
if you don't increase the main jet your bike will run lean and hot.

Once done you'll be able to crack that throttle and the whole neigborhood will here ya.
Loud pipes save lives.
Best Regards
Big Al

May 28, 2011 | 2005 Suzuki Boulevard M50

2 Answers

Back fires when you let off gas


These will backfire when you let off the throttle if the idle is set low. When set low enough to sound "right" you will get the backfire. Set the idle up a bit and you will lose the backfire but it will sound like it is idling a bit fast.

Sep 25, 2009 | 2005 Suzuki Boulevard S40

2 Answers

2006 GRIZZLY When I THROTTLE LIGHTLY THE MOTOR


Check valve adjustment and cam chain tension

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Suzuki C50 Boulevard (4k miles) backfires during deceleration when under pressure. (the clutch handle is not pulled or it has just released.) It really gives one loud POP! The rest is the usual sounds of...


Backfiring when the throttle is closed shows a lean mixture. Either you, or your mechanic should take a look at the mixture, and there's a 99% chance that that was the cause of your problem :)

Jun 13, 2009 | 2005 Suzuki Boulevard C50

4 Answers

Backfiring


backfiring means you have an air leak or a lean mixture. Look for leaks at the header pipes or perhaps a crack in the exhaust.
Cold air getting into the exhaust is usually what causes the backfire noise.
You may have a lean engine running situation but the bike would have other issues besides the backfire.
Let me know if you are having any other issues or if it just the backfire.
Regards,
RSelvy

Jan 02, 2009 | 2005 Suzuki Boulevard C90

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