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  #1 (permalink)  
Old 06-16-2017, 06:49 PM
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Backfire on decel

I read other posts but its always nice to hear it fresh! Bike is running pretty good other than backfiring on decel. I am making sure the timing is at 25-26 degrees on the light tomorrow(Ultima 127) to be 100%. I know I dont have baffles in the Martin Bros Daisy Cutters. Given its timed correctly and its still backfiring, what should I check next? I also know I dont have an intake leak or exhaust leak.
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Old 06-16-2017, 07:15 PM
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A lean issue...just like in all the other posts! P.S...Cranking up the Acc pump doesn't fix the problem...it's just a band-Aid. LOL

Last edited by Mr Scary; 06-16-2017 at 07:23 PM..
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Old 06-16-2017, 09:10 PM
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Here is something that will clear that up for you..

http://advrider.com/index.php?thread...othing.728802/
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Old 06-23-2017, 08:15 AM
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Timing is finally timed at 26 degrees and jetted according to what seemed to work the best based on various posts"

Mikuni 45
-32.5 idle jet
-95 needle
-Y8 needle jet
-185 main jet.
- Air screw is turned halfway between lean/rich stumble points

With no leaks in the intake manifold or exhaust, the pipes are 1.75-2-2.25 and have no baffles. They are on the shorter side and was wondering if installing baffles or torque cones would help with the backfire?
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Old 07-01-2017, 08:16 PM
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if your looking for loud and wanting some back pressure by using torque cones or Big City Thunder Baffles will help... the B.C.T's baffles are designed to use several ways getting you at least a compromise i use them in several of my bikes although torque cones are the least expensive way to go...... the other option is to take a automobile exhaust reducer that will fit snuggly in your exhaust weld the 2 ea 3/16 smaller ends of the reducers.... together, understand then install a eye bolt about the size of a nickel 1.5 inches from the larger end of the reducer thus it gives back the needed back pressure the bonus is a nice sound, although it must be installed at least 3.0 inches inside from the end of the exhaust pipe, the new baffle can be used end for end thus changing the mid-range some
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Old 07-03-2017, 09:04 PM
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The term back pressure is misleading, you don't want any back pressure in your exhaust, it will blow your exhaust gasses back into the combustion chamber....baffles are designed to break up
resonance in the pipes which can inhibit exhaust flow..but not all pipes have resonance which is why they work for some people and not others..
They might stop a pop...
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Last edited by Shovel52; 07-03-2017 at 09:11 PM..
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