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Old 01-31-2013, 06:42 AM   #1
GHANTCR OP
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950 Farts on Compression

Well I am about to hit my head!

Carbs are clean and in almost great shape!
Carbs are synced!
Exhaust are in great shape
Gas is of great quality!
Sparkplugs are ok!

Out of this what should I look for?
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Old 01-31-2013, 06:46 AM   #2
borborygmus
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farts?

OK, I'll bite. How does a 950 fart?
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Old 01-31-2013, 07:10 AM   #3
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When on compression, its like small explosions, and they start reducion as rpm go down.
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Old 01-31-2013, 05:09 PM   #4
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Quote:
Originally Posted by GHANTCR View Post
When on compression, its like small explosions, and they start reducion as rpm go down.
If by compression you mean letting go of the gas (ie. decelerating or engine braking), and it has the power it should have on acceleration, then the pops/farts/flames/whatever she does:) are normal.
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Old 01-31-2013, 05:29 PM   #5
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I think something is being lost in translation.

If "fart" means a pop in the exhaust on deceleration, that really is fairly normal for the LC8 motor depending on the exhaust system. The popping can be made worse by air/fuel mixtures being off and some aftermarket mufflers.

If by "fart" you mean a backfire into the carburetor, that typically is caused by a vacuum line not being sealed off or a carburetor not being properly seated on the little rubber boots that they sit on.
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Old 01-31-2013, 08:15 PM   #6
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Maybe its my carbs setting air/gas mix 1.75 turns outside when original is 2.25 but why does it really affects the rear cylinder.

Yes desaleration.

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Old 02-01-2013, 06:45 PM   #7
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So It is normal? Well I have to say no! Had the same bike back in Costa Rica, same mufflers and settings and it didn't make those loud noices on desaceleration!

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Old 02-02-2013, 03:51 AM   #8
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So It is normal? Well I have to say no! Had the same bike back in Costa Rica, same mufflers and settings and it didn't make those loud noices on desaceleration!

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check for air leaks in the intake (carb boots - are the carbs seated properly?), and in the exhaust system.
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Old 02-02-2013, 06:11 AM   #9
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Checked! Everything is fine!

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Old 02-02-2013, 07:23 AM   #10
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could be this bike is a little leaner on the pilot jet or you can try adjusting the air/fuel screw. I am not familiar with these carbs but generally if screw is in front of carb(closest to intake boot) then it is a fuel screw, turn out for more fuel, if at the back of the carb then it is an air screw. Turn it in for less air, Both of these will richen the ratio when the throttle is shut. Don't expect a huge difference though. Previous poster is right about possible vacuum leaks and exhaust can figure in.
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Old 02-02-2013, 07:28 AM   #11
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Will try, i know its an mix screw

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Old 02-02-2013, 08:44 AM   #12
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Air Leak Jets -

The decel pop you are getting is generally caused by the "air leak jets". All Keihin CVK carb'd-bikes have this problem to some extent or another. Changing these jets to a richer mixture can help (assuming there isn't a tear in the air leak diaphragm under its cover, which does happen)

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Both of these will richen the ratio when the throttle is shut. Don't expect a huge difference though
the pilot air jets don't affect closed- throttle idling- there is a different circuit in the carbs to handle this.
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Old 02-02-2013, 08:54 AM   #13
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If you have hoses in place for checking the vacuum synchronization on the carbs a leak on them could also cause some bangs on deceleration:

Found a broken hose on the intake

Have had that problem previously, then there was exhaust bangs on engine breaking and they go alot worse when going below 4000 rpm.

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Old 02-02-2013, 03:26 PM   #14
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guess I am just a 2 stroke guy. If pilot is to lean you can seize a engine on long decents as the pilot is primarily responsible for feeding engine with a closed throttle. A lesson actually learned the hard way. Maybe my 2 cents is only worth 1 cent.
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