Catch can mod on stock 2017 air box not working out- Removed it back to stock
A while back I posted the mod I did in the below pic's . I installed a catch can I purchased from DK Customs on the breather lines on my stock 2017 M8 air cleaner. I simply plugged the back hole in the stock air filter with a rubber plug. I then added a longer piece of tubing to the catch can as seen bellow (pretty simple mod).
Well, I removed it see stated reason below.
For what ever reason the front factory rubber nipple that snaps on to the front breather bolt (front cylinder) would weep oil around it out of it and run down over time into air box bottom. The rear rubber nipple on the back (back cylinder) did not. I cleaned several times made sure both breather bolts in to the cylinders were torqued correctly. Also verified leak several times around front nipple it was not around the breather bolt it was sealed and ok.
My thinking is the added restriction or back pressure from the longer piece of tubing going to the catch can or even the restriction of the vapor passing through the catch can or both may have been causing this issue, I don't know for sure ?? The nipples snap on the breather bolts ok but I would not say there supper tight from the factory by any means.
I put the breather system back to stock configuration and the issue is gone. No more leak at the rubber nipple on the front breather bolt.
Well the experiment was worth the try in my opinion.
Also there is a pic below of the stock breather line configuration with the air filter removed. The nipple that hangs down in this pic goes through the back of the stock air filter int the throttle body. Pretty much the same way on all stock Harley intake air cleaner systems.
Ride Safe All,
Bill G
A while back I posted the mod I did in the below pic's . I installed a catch can I purchased from DK Customs on the breather lines on my stock 2017 M8 air cleaner. I simply plugged the back hole in the stock air filter with a rubber plug. I then added a longer piece of tubing to the catch can as seen bellow (pretty simple mod).
Well, I removed it see stated reason below.
For what ever reason the front factory rubber nipple that snaps on to the front breather bolt (front cylinder) would weep oil around it out of it and run down over time into air box bottom. The rear rubber nipple on the back (back cylinder) did not. I cleaned several times made sure both breather bolts in to the cylinders were torqued correctly. Also verified leak several times around front nipple it was not around the breather bolt it was sealed and ok.
My thinking is the added restriction or back pressure from the longer piece of tubing going to the catch can or even the restriction of the vapor passing through the catch can or both may have been causing this issue, I don't know for sure ?? The nipples snap on the breather bolts ok but I would not say there supper tight from the factory by any means.
I put the breather system back to stock configuration and the issue is gone. No more leak at the rubber nipple on the front breather bolt.
Well the experiment was worth the try in my opinion.
Also there is a pic below of the stock breather line configuration with the air filter removed. The nipple that hangs down in this pic goes through the back of the stock air filter int the throttle body. Pretty much the same way on all stock Harley intake air cleaner systems.
Ride Safe All,
Bill G