255 cam project is starting
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Seasoned HDF Member
Joined: Mar 2009
Posts: 24,728
Likes: 9,235
From: Snow Hill, NC
Is there really any advantage to this? I guess i will have to see what this is when i take it apart right?
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Joined: Oct 2009
Posts: 54
Likes: 2
I changed to the 255 cams at 5,000 miles run the pc v for a while; got about 45 mpg on the highway but i had trouble with hot weather and went back to the stock ecm and a stage II download from the dealer. the problem went away and the bike ran better than it ever had. overall performance improved but the mpg dro[[ed tp about 42 the cams work well in the 96 inch motor you will be pleased with them; they should be the stock cams for these motors. not a hot rod thing but you will notice the perfomance.
Good Luck
Good Luck
Road Warrior
Joined: Jan 2010
Posts: 1,290
Likes: 20
From: Salem, Or
I changed to the 255 cams at 5,000 miles run the pc v for a while; got about 45 mpg on the highway but i had trouble with hot weather and went back to the stock ecm and a stage II download from the dealer. the problem went away and the bike ran better than it ever had. overall performance improved but the mpg dro[[ed tp about 42 the cams work well in the 96 inch motor you will be pleased with them; they should be the stock cams for these motors. not a hot rod thing but you will notice the perfomance.
Good Luck
Good Luck
What pipes and AC are you running?
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Seasoned HDF Member
Joined: Mar 2009
Posts: 24,728
Likes: 9,235
From: Snow Hill, NC
What do you mean?
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Joined: Oct 2009
Posts: 54
Likes: 2
High flow from Harley / I did a mod on my stock mufflers; changed the header to get rid of the cat. every thing I tried from the after market world was too loud for my taste. I worked with the pipes for the sound and found the performance changed at different rpm's with the changes I was making. after some time in the shop with different baffles and test rides the butt dyno I found smooth power from top to bottom. with this set up I can roll on the throttle in sixth gear running about 48 mph and the bike pulls like a train. before with the stock set up; anything below about 55 mph I would have to down shift. I pull an N-line trailer and have no problem keeping up with the group. I have made a lot of changes to this bike but the 255 cams was the biggest improvement. 1,800 rpm to 4,800 rpm smooth power. it is very rear for the rpm to reach anything above 3,800 there is no need with this set up.
Road Master
Joined: Nov 2009
Posts: 1,218
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From: Yakima WA
The advantage is less oil out the breather during prolonged periods of running hard. Many bikes actually mist oil out the breather to the point that on long road trips it will drip off the breather and slightly oil the passengers right leg some. Drilling the drain passages on the rocker stands helps to improve the drain characteristics. That being said, there is a fine line between just right and too big on the return hole. The #43 drill bit seems to be just right.
Seasoned HDF Member
Joined: Jun 2006
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From: Vermont
Shown below is the Mystfree instructions showing the drilling of the supports and the size and benefit.
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HDF Community Team
Joined: Jun 2006
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From: san antonio
Wrong, put the trans in 1st gear and hold the brakes, the cam gear bolts will break loose. Works when retorquing also.
As for drilling the holes in the support plates, I have always believed that if you have sufficient oil carryover from the crankcase vents to actually make it out to the air cleaner and on to the passengers leg, drilling a couple of .089 holes in the support plates is not gong to stop that. Having said that, I have drilled many to .125" because I don't see how it hurts.
If oil carryover is puking out the air cleaner, there is something else wrong, i.e., crankcase over filled, crank case breathers clogged, sumping, etc. The crank case ventilation system can be improved by venting the breathers to the atmosphere. Doherty also offers a kit for that purpose but some fuel line, brass or plastic fittings and clamps and a small paper filter to catch the mist is the DIY solution. That's for mist and vapor and not a solution for oil puking.
As for drilling the holes in the support plates, I have always believed that if you have sufficient oil carryover from the crankcase vents to actually make it out to the air cleaner and on to the passengers leg, drilling a couple of .089 holes in the support plates is not gong to stop that. Having said that, I have drilled many to .125" because I don't see how it hurts.
If oil carryover is puking out the air cleaner, there is something else wrong, i.e., crankcase over filled, crank case breathers clogged, sumping, etc. The crank case ventilation system can be improved by venting the breathers to the atmosphere. Doherty also offers a kit for that purpose but some fuel line, brass or plastic fittings and clamps and a small paper filter to catch the mist is the DIY solution. That's for mist and vapor and not a solution for oil puking.