Just installed 255s. Starting sucks
HDF Community Team
Joined: Jun 2006
Posts: 12,779
Likes: 2,609
From: san antonio
I think a waste of time; cannot make any timing changes with the PCV and timing changes may be required to dial in the tune on the 255s. Having said that, any tune will be better than a map and when on the dyno, your tuner can tell you if timing changes should be made to optimize the tune.
Too much compression with the early intake close of the 583. 9.7 corrected and 204psi CCP; might be OK for some but a bit on the high side for me.
Originally Posted by Fblo
I can get a brand new aet of ss 583c easy starts w bearings and adjustable pushrods for 350 right now.
Road Warrior
Joined: Mar 2013
Posts: 1,923
Likes: 587
From: Alorton, Illinois
You can tell if your ACR's are on with a compression check. To get an accurate one. You will need to pull the fuse or unplug them under the tank.
If the biggest complaint is how it starts. Get a flash base tuner that allows you to take timing out while starting. You might be set up at 5 BTDC now and changing that to 0 helps with starting. I can't recall if the PC5 has this option. BUT you can try. Go to the ignition table and pull -5 in the 0-5 columns in the 500 rpm range. If this table is all zero's. I would suggest a different starting cal.
If the biggest complaint is how it starts. Get a flash base tuner that allows you to take timing out while starting. You might be set up at 5 BTDC now and changing that to 0 helps with starting. I can't recall if the PC5 has this option. BUT you can try. Go to the ignition table and pull -5 in the 0-5 columns in the 500 rpm range. If this table is all zero's. I would suggest a different starting cal.
HDF Community Team
Joined: Jun 2006
Posts: 12,779
Likes: 2,609
From: san antonio
Remove the system relay from fuse block to disable ACR. I think system relay is #11 in fuse block.
IIRC, with stock heads and head gasket, you should see about 200psi with the 255 cams. If the ACRs are working, you will probably see 170ish; I think, not sure how much compression the ACRs bleed off. If the bike is FBW, you will need to manually hold the throttle plate open.
IIRC, with stock heads and head gasket, you should see about 200psi with the 255 cams. If the ACRs are working, you will probably see 170ish; I think, not sure how much compression the ACRs bleed off. If the bike is FBW, you will need to manually hold the throttle plate open.
Road Captain
Joined: Jan 2014
Posts: 566
Likes: 70
From: The Redneck Riviera
Yep, Key off, spark plugs out, starter button or jumper wire from main Positive lead to the solenoid trigger (green wire), turn engine over until compression gauge stops showing PSI increase, not necessary to open throttle, will just take a few more revolutions to reach max PSI, this method leaves ACRs, Fuel Pump, Ignition off line.
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Road Master
Joined: May 2012
Posts: 1,001
Likes: 107
From: Houston
Just rented a compression gauge. Gonna check. So yall are saying if my pressures arent equal or very close i have a timing issue? Also just received map from fuel moto. Havent looked at it or loaded it.
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Road Master
Joined: May 2012
Posts: 1,001
Likes: 107
From: Houston
Well seeing as how i got laid off a month ago. Im not ready to give up yet and spend more on other cams. Ive read plenty of people are happy with these cams, im trying to be one of them 
on another note, i appreciate the help you guys. Soon as i get back from gettin kids from school im checkin compression. Stand by.
on another note, i appreciate the help you guys. Soon as i get back from gettin kids from school im checkin compression. Stand by.