Autonerdz forums

I have done 2 captures with the WPS in the rear cylinder on a XR1000 Harley. One is cranking and the other is running @1,400 rpm. Should I assume the reason I am seeing the difference in respect to cam timing is because of the uneven firing on this V - Twin motor? Comments?

James, don't know much about Harley but unless they employ some form of variable cam timing which I doubt, could be wrong. Again with the bikes don't have a lot of data in front of us.......need too hunt a little. Like the KAW 450 you worked on the strategy is not always posted as much as for cars.

See your EVO markers, but would like to align it with the tool I have which I originally got from Scott Schotton, ETO, but was surrouned by a propritery law suit, so don't think it is still available.


Also could you drop the file in here or over in the drop site, but last time I had a hard time accesing it. If the information is not too large you can file it here.

By the way.........just finished a 2700 mile ride in Or, Id, Mont, Wyoming mostly in the dirt, was a great ride, 35 riders, some came and went, a few broken bikes, but no broken riders, always a plus, will send you some pictures.

Glad too see your still playing wiht the Pico, good for you.

you may also want to post a good cylinder as a comparison

I do not have a known good. There is no CKP sensor, just a pickup for the ignition. Its hard to get any capture cause 'the thing runs so poorly. Doesn't look right to my amateur eye and I have decided I am going to pull it apart to check camshaft timing etc.

Spence, that would be awesome if you could.

Spence, uploaded a Service Manual for you in the Drop Site under my name James Hunt - Harley folder

Spence, your not going to like my answer and i am not positive but I think you have to remove the rear wheel and splash guard.  You may want to change your mind and not to worry, sounds like too much grief. I checked the valve clearance and did find the front cylinder Intake was way loose .005" which makes sense with the compression waveform as the the intake timing was retarded and compression was higher than the rear cylinder waveform. The rear cyl valve clearance were both loose by .002". The engine runs better but still way leaner on the front. I am going to check intake vacuum next on both now that I have adjusted the valve clearance. I had only 10 in hg of vacuum before, that seems low to me but they were both about the same so im not sure why the front is so much leaner.

James H wrote on Aug 12^th, 2017 at 7:11am:


No worries James. As I told you I already changed out the stock PCM for a ThunderMax which I can re write the calibration for the engine management system. You are correct you have to remove the rear wheel to gain access on this ride to get to the PCM.

I looked and the CKP sensor connect is accessible. You will get the captures at least to review and talk about...   

James H wrote on Aug 12^th, 2017 at 7:11am:


Vacuum leaks are not much of an issue as these PCM employ "Alpha N" logic to fueling if yours is fuel injected. If not then have at it.

As far as vacuum at idle. I don't think these engines have that much with the way they are laid out. 

Glad to hear you are doing better with your problem child! Get the lean condition figured out and lets go for a ride.