As anyone can see from my signature, I have a pretty well modified Trike Motor and would like to share my experience with installing the DK Custom Products Air Cleaner System - 636V.
My existing A/C was the HD SE Heavy Breather system, I chose this system not only because I thought it would provide the best air flow, but also because it was all chrome and "pretty"!! Recently I had been considering modifying the system to eliminate the oily air vapor from going back into the TB. I had a 2008 Ultra with a 120r crate motor that I modified the backing plate to eliminate the oily air vapor from the TB via a catch can mounted on the left side down tube, and I liked the system a lot. However, when I traded my Ultra in for the Trike I did not take the system with me and thought "what the hell" all the Harley's running around had the crankcase vent to the TB so for 3 yrs I left the OEM system alone. While planning our trip to Cedar City exactly a month ago, I pulled my breather off and observed a fair amount of oil laying in my TB, well that P****d me off and at that point I decided to do something about venting my crankcase breather system to atmosphere.
I spoke with Kevin several times to discuss how we could possibly pull this off and retain my "pretty" HD Heavy Breather system and realized that this would take an extreme effort on my part with some drilling/tapping/plugging of the backing plate so I decided to opt for the DK Customs 636v system with the discrete breather catch can. While discussing with Kevin, he mentioned they had experienced a little better performance out of the 636v system than the HD Heavy Breather. At that point I advised Kevin that I was not looking for any "increase in performance" as the 120 had all that I thought the Trike could handle. I was also skeptical that the 636v would out perform the HD Heavy Breather system.
After receiving and installing the 636v A/C system, I decided to do a couple of Target Tune (TT) Auto Tune (AT) runs to see if there was in fact any difference. What I discovered was with the 636v A/C it changed my VE's to a point that I had some that exceeded the limit of 127.5 so I scaled the first time (as advised by both DJ and Jamie at Fuel Moto) and ran another tune to stack on top of the last one. The next tune brought my VE's very near perfect (for the AT system) and it is running better than it ever has - i.e smoother idle, extremely smooth cruise and on the acceleration it is too hard to say from the butt dyno.
I am thinking that the fact that the motor is now getting clean/cooler air is one factor in running better, but also the 636v system intake elbow is about 3/8" smaller in diameter than the HD Heavy Breather and the increase in velocity my also be a contributing factor. But I am extremely happy with the overall performance of the DK 636v A/C system and would recommend to anyone interested in venting their crankcase breather system to atmosphere that they contact Kevin or Devin at DK Custom Products and discuss the possible systems they have available for your specific application.
Take care, ride safe!!
Roger
My existing A/C was the HD SE Heavy Breather system, I chose this system not only because I thought it would provide the best air flow, but also because it was all chrome and "pretty"!! Recently I had been considering modifying the system to eliminate the oily air vapor from going back into the TB. I had a 2008 Ultra with a 120r crate motor that I modified the backing plate to eliminate the oily air vapor from the TB via a catch can mounted on the left side down tube, and I liked the system a lot. However, when I traded my Ultra in for the Trike I did not take the system with me and thought "what the hell" all the Harley's running around had the crankcase vent to the TB so for 3 yrs I left the OEM system alone. While planning our trip to Cedar City exactly a month ago, I pulled my breather off and observed a fair amount of oil laying in my TB, well that P****d me off and at that point I decided to do something about venting my crankcase breather system to atmosphere.
I spoke with Kevin several times to discuss how we could possibly pull this off and retain my "pretty" HD Heavy Breather system and realized that this would take an extreme effort on my part with some drilling/tapping/plugging of the backing plate so I decided to opt for the DK Customs 636v system with the discrete breather catch can. While discussing with Kevin, he mentioned they had experienced a little better performance out of the 636v system than the HD Heavy Breather. At that point I advised Kevin that I was not looking for any "increase in performance" as the 120 had all that I thought the Trike could handle. I was also skeptical that the 636v would out perform the HD Heavy Breather system.
After receiving and installing the 636v A/C system, I decided to do a couple of Target Tune (TT) Auto Tune (AT) runs to see if there was in fact any difference. What I discovered was with the 636v A/C it changed my VE's to a point that I had some that exceeded the limit of 127.5 so I scaled the first time (as advised by both DJ and Jamie at Fuel Moto) and ran another tune to stack on top of the last one. The next tune brought my VE's very near perfect (for the AT system) and it is running better than it ever has - i.e smoother idle, extremely smooth cruise and on the acceleration it is too hard to say from the butt dyno.
I am thinking that the fact that the motor is now getting clean/cooler air is one factor in running better, but also the 636v system intake elbow is about 3/8" smaller in diameter than the HD Heavy Breather and the increase in velocity my also be a contributing factor. But I am extremely happy with the overall performance of the DK 636v A/C system and would recommend to anyone interested in venting their crankcase breather system to atmosphere that they contact Kevin or Devin at DK Custom Products and discuss the possible systems they have available for your specific application.
Take care, ride safe!!
Roger
Last edited:
epper:
