Hey. I looked on here but couldn,t find what i want. Is it a big and costly job to wire auto comp. to a 09 classic. thanks.

 

I would think that pulling the heads, drilling and tapping them would be the long pole in that tent. Compared to that, I wouldn't think wiring would be that expensive.

 

Hmm,

looked at the 09 wiring diagram and there is no facility there, and no ACR facility at the ECM.

So this may require a change in ECM wpuld be required ( and would the thundermax be a better, less expensive way to go?)

but manual CR's would be fairly easy ( I see that a pair of JIMs are under $100)

Mike

 

Here is the instructions that come with the harness 70623-08, that I think would be used to wire in the ACR's. I put them in my 08 FLHX when installing my MVA heads. http://www.harley-davidson.com/en_US...ts/-J04441.pdfThe ecm has to be enabled using the dt or a sepst, tts or pv.

 

Noob question....What is the purpose of the CR and how do they work?

 

I had this done a few years ago. Local shop wanted about a grand. I can't remember if that included the ACR's which cost about $100-150 as I recall.

Anyway, it was well worth it in my case. I had severe starter kick back thanks to the engine build from a 96 to a 103 by the former owner. He told me, ".... all Harleys kick back like that....". Idiot that I am and new to Harley I accepted that for a few days and then I came to my senses and had the compression releases installed, plus I had it built to a 107 since they had to go in there anyway. What a freaking relief to start the bike without people nearby saying, "Holy crap, that doesn't sound good!"

VR

 

Wire them through the "start" switch ... or you can buy the harness and hook it through the ECM ( a bit of a task ) and good eyes needed.

http://www.harley-davidson.com/en_US...ts/-J04441.pdf

 

ACR's are 40 a piece, the harness is 50. If his heads are already prepped for them I don't even think he has to take off his heads, only the tank. I don't think he stated what heads he has, stock or otherwise. I had mine installed a few years back as well and I am very glad I did too.

 

compression releases are like "valves" added to the heads.

they allow a starting motor to spin a few times without compression to build up forward momentum, then the compression releases close, and the motor will then have fuel/air, spark, and compression and can start up.

the automatic CR ( ACR's) are used by H-D on the 103 motors.
and as discussed here, can be added to other models

the old Vincent Black Shadow had them controlled by a lever on the left bar

manual types are often just set into position by the rider and will close automatically


the twin cam motor has a light flywheel compared to earlier V twin motors, this allows the motor to build RPMS more quickly, but there are drawbacks, such as lower forward momentum, poorer low speed operation ( my '53 can ride at 600 rpms)
the twin cam is also typically higher compression than earlier motors
all this means that a motor trying to start can 'rebound" or reverse direction if the piston doesn;t have enough forward momentum to gets past Top Dead center ( TDC) on the compression stroke


mike

 

The overlay harness isn't a big deal, but you have to reconfigure the fuse block, and open the ecm main plug. (at least that's what I had to do on my bike). Later 103 heads, and many SE heads are already machined to accept the acrs. I enabled my acrs via tts.