Question about Harley Davidson FXD Dyna Super Glide Motorcycles

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2008 96ci EFI a year ago at 25,000 miles changed to a 103 stage 2 with stock head and SE 255 cam which harley installed Now at 53,000 miles changed to 103 SE 11:1:1 piston SE 110 heads SE263 cam.This is my first bike build have worked on cars alot old shadetree.Cams are alined and timing marks it wont fire sounds out of timing re-did timing twice timing marks are dead on am i missing something on EFI ? pulled a plug its getting fuel.

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  • wd4ity
    wd4ity Nov 09, 2010

    First let me explain that I am no twin cam mechanic. I work on the old Harley's that the dealers will not work on, Evo's, Shovels, Pans, Ironheads, and the Italian Harleys. I've never been inside the cam chest of a twin cam but have been into many Harley engines. Now, in the twin cam, there is timing between the two cams that has to be set and then the pair have to be timed with the crank. In the Evos, the TDC mark on the flywheels has absolutely nothing to do with the cam timing. The cams time to a mark on the pinion gear on the pinion shaft. On the twin cam, since the cams are chain driven, the marks have to be in a particular position with the tension of the cam chain tensioner on the chains. You should be able to verify the timing with the "nose cone" off the engine and everything tensioned. You should be able to verify the cam timing is correct by running a compression test on the engine. If you have everything timed correctly, you'll have good compression. If not, you won't have the correct compression.

    Now, as for the igniton, I thought the ignition was controlled by the crankshaft position sensor on the right front of the engine cases. I may be wrong on this as I have NO experience with these vehicles. Only know what I've read. The sensor picks up pulses from the right side flywheel and it's scalloped outer edge. It should have a special "tip" that tells the onboard computer, the ECM, that the engine is at Top Dead Center and it electronically sets the timing for the engine's speed in RPM. Matter of fact, I dont' think the engine has a timing hole with which to set the timing with like the older bikes do. Here again, I do not claim to know anything about the twin cam engines just trying to say something that might help you figure out what your problem is. Go to this site, I'm sure you'll find the information you need there.http://www.nightrider.com/biketech/toc.h...

    good Luck
    Steve

  • cat6230 Nov 09, 2010

    Yes you do know about twin cams cause that is the way its set up like the EVO everything you said is eaxtly correct and the way its set up i took a straight edge and alined the cams also checked top dead center no matter how many times you turn the crank its at TDC when on the crank timing mark.I think you have something there with the ECM and timing sensor i also had to install compression release kit which is electrical with you explaining how it should be gives me the confidence that i did it right,now i will check electrical part .I know better than to do more than one thing at once but never learn.I been to nightrider before hard to get a answer there.Thanks for everything Steve very help

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The Night rider site is not set up so that one can ask a question. It's more a site that offers information about "how to" stuff so that you can read and learn how to do a job or verify that you have done the job correctly.

According to your response, I'm assuming you have good compression and you're confident in your work as the cams are concerned. Now, the problem seems to be more electrical rather than mechanical. Have you checked for spark at the plugs? The Twin Cam engines have a compression sensor. If this sensor does not sense compression, the plugs won't fire. This could be your problem since you installed the compression releases. Have you somehow over ridden these sensors?

Good Luck
Steve

P.S. I have no formal training with the Twin Cam enignes nor do I work on them. I've got all I want to do with the older models. Especially the Shovelheads. It's gotten very difficult to find a Shovelhead mechanic these days. The last year for the Shovel was 1984 for most models.

Posted on Nov 09, 2010

Testimonial: "You said you haven't worked on newer or twin cams you know your bikes you have more info for me than the manual does.When they say EXPERT they mean it"

  • cat6230 Nov 09, 2010

    The compression sensor would be where? The compression releases came with the heads my bike did'nt come with them stock .I had to get the wiring harness from harley would it matter if the connecttions where hooked up backwards meaning front going to rear and rear going to front would that matter? I did not check that just plugged them in.The service book said nothing about a compression sensor gonna give that a check as far as checking spark pulled the plugs put them touching the cylinder on the side seen spark on the back but not the front plug.Would my bike have these sensors without needing them stock? Thanks steve

  • wd4ity
    wd4ity Nov 09, 2010

    Now you got me Cat. I have no idea as to where the compressions sensors are or even if they are there. This is something that I've heard not actually seen. They tell me that you cannot use the old method of testing spark plugs on the Twin Cams. You must leave a set of plugs in the heads, and install another set to check for spark. Seem strange that Harley would sell the compression release kit and not tell you how to bypass the compression sensors if they're there. I just don't know. Sorry.

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