I have just fitted and timed a set of adjustable cam pulleys on my Paso 906 . I wont bore you with the details ........yet :smile: , but if anyone wants to know how or why ..................
Did it make much difference. I would be interested as to how it's done as I have often thought about doing it but wondered what's involved.
I would like to know Hamish! - almost can't fail to make an improvement even if it's just to remove 'discrepancies'. You have no doubt read plenty including Brad's excellent notes?
Discrepancies ...:smile: your to kind :smile:. I was following instruction written by some guy called Ken ( its very good ) that I googled , Called "Paso cam timing " There is also good stuff on the Ducatipaso site . The factory spec's put the intake lobe centre angle at 110deg ATDC . My Paso was 117 vert and 112 deg hor. I could live with slightly out of spec timing ... if they were both the same. The weber has its own issues and I couldn't see the point in trying to tune it when the two pots were cam timed differently, so I collared a pair of adjustable sprockets off Brad ( excellent service , www.bikeboy.org )and went for it . The only difficulties I had were , A)the factory cam retaining nut tool would no longer fit because the locking cap screws on the pulley were to high ... solved by fitting an extra washer behind the nut and trimming ( dremmel ) a bit off the tool . B) the same tool doesn't clear the bottom rhs radiator mount on the paso frame ( dremmel ) not an issue on the SS. If your going to do this , read thru the inst , paying particular attention to the bit were it mentions the valves hitting the piston stopper whilst finding TDC and setting the degree wheel to zero , I set the relevant cyl at TDC on the comp stroke ( both valves closed ) and removed the cam belt before rotating the engine back and forth to find TDC and them refitted the belt . Brad's pulleys came index marked and were easy to fit, tho I did spend a little time removing small machining burrs so the two parts of the pulley moved smoothly against each other. When turning the crank do so gently in case anything "hits " , The valves WILL hit the piston stopper and WILL bend , and ,a hem ,some how I screwed up the 1st attempt and had a valve to piston hit .... so be gentle until your sure everything is right . Check all dial gauge/degree wheel reading several times before and after adjustment . I set my lobe centre angle at 106 deg ATDC which should boost bottom end and midrange at the expense of the top end ( suits me fine ). I haven't run the bike since fitting the pulleys , I cant even get on it much less get my right foot on the foot peg. I have made all of my own tools ( apart from the cam pulley /nut holder thing ) out of what is basically small bits of scrap . The fiddliest bits were setting up the degree wheel and positioning the dial gauge . :smile:
How far away from actually running it though H? - you need to get it running for Christmas day doncha?
My Paso has been off the road for 6 years now ,just needs a paint job . I pulled it to bits , moved house , bought a 900SS , rode that and forgot about poor old Paso , till I crashed , bought a R80 and rode that coz I could get my feet on the pegs ( cant bend r knee past 80 deg ) , fixed the 850T Guzzi , sold the BM , and now Paso is 1/2 way thru a 17" wheel conv ( using parts of the SS ) , AND I have to many other irons in the fire ( RD400g , MVX250 , Capri /roverV8 )...... maybe next Christmas :smile:
