Anyone doing the breather bypass on your M8?
#271
I don't have the answer but owning and flying aircraft for 30 yrs if its filled to the top level mark it will blow out 2 qts in 6-8 hrs everytime leave it at 2qt low mark stays there for next 30 hrs .Now it holds 12 qts of oil. Also air cooled engine. Not saying it relates but I know for fact with those engines it made a difference
I do not know if there is a direct correlation to Harley engines but with all engines, I have always been told that it's better to be ha lf quart low than high.
#272
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GlidingJoe (01-10-2019),
KeyResults (12-06-2021)
#273
I've had Evo's, Blockheads and M8's since the mid 1980's. They all puked oil into the air cleaner. Until my current 115th Fatty, I routinely did a breather bypass using either a hose and small air filter or catch can. Usually under the bike or hidden in another location. My greatest objection to the Motor Companies archaic breather system was the mess the oil puking made on the bike. I considered bypassing the system on my 2018 Fatboy but after discussing the issue with my usually warranty friendly dealer service manager, I decided on a Harley Heavy Breather to eliminate the oil spatter issue emanating from the air cleaner. I'm very happy with the result because the mess is completely eliminated and I've forestalled any possible warranty problems resulting from unauthorized mods. Granted, the oil mist still goes into the engine, but I'm not worried about that if the Harley engineers aren't.
Last edited by Mac-427; 12-06-2018 at 06:35 AM.
The following users liked this post:
Dante221 (12-25-2018)
#274
#275
I've had Evo's, Blockheads and M8's since the mid 1980's. They all puked oil into the air cleaner. Until my current 115th Fatty, I routinely did a breather bypass using either a hose and small air filter or catch can. Usually under the bike or hidden in another location. My greatest objection to the Motor Companies archaic breather system was the mess the oil puking made on the bike. I considered bypassing the system on my 2018 Fatboy but after discussing the issue with my usually warranty friendly dealer service manager, I decided on a Harley Heavy Breather to eliminate the oil spatter issue emanating from the air cleaner. I'm very happy with the result because the mess is completely eliminated and I've forestalled any possible warranty problems resulting from unauthorized mods. Granted, the oil mist still goes into the engine, but I'm not worried about that if the Harley engineers aren't.
The following users liked this post:
Mac-427 (12-06-2018)
#276
"I believe the old adage of 'burning the carbon out' still holds true."
I agree! I've been riding my Harleys more on the aggressive side for many years and carbon has not been an issue.
Keep oil level 1/2 to 3/4 on the stick I still have to clean air filter oil mess out every now and then but I don't mind.
Being pro active maintaining a Harley has always been standard procedure.
I agree! I've been riding my Harleys more on the aggressive side for many years and carbon has not been an issue.
Keep oil level 1/2 to 3/4 on the stick I still have to clean air filter oil mess out every now and then but I don't mind.
Being pro active maintaining a Harley has always been standard procedure.
#278
I installed a breather kit on my '17 RKS about 10000 miles ago. I purchased my kit from DK customs and I retrofitted onto my SE Ventilator AC. The bike doesn't seem as sensitive when it gets hot out and always runs crisper and snappy compared to before I installed. The pictures below are showing the dispersed 'crud' after roughly 500 miles.
#279
I installed a breather kit on my '17 RKS about 10000 miles ago. I purchased my kit from DK customs and I retrofitted onto my SE Ventilator AC. The bike doesn't seem as sensitive when it gets hot out and always runs crisper and snappy compared to before I installed. The pictures below are showing the dispersed 'crud' after roughly 500 miles.
cheers bro
#280
This sample was from a little of both riding conditions. We were transitioning into winter when I took this sample. This was basically one 300 mile ride in 80 deg temps and then multiple short 40-60 mile rides in 50-75 degree temperature ranges. I haven't noticed an increase or decrease based on temps or with short or long rides. It's been a pretty consistent amount regardless. I use Redline synthetic oils just fyi.