paso750 wrote:Actually he probably would push me to do so just to see if that was possible :laugh:
:laugh: I was not so lucky...
paso750 wrote: About all the mods mentioned when changing the engine I wonder if you really have to change
I just wanted to describe just what I did for my bike, surely some modifications were needed, while others were for performance and others were unnecessary… but I felt that the bike was better with them.
Indeed, what I mean is that when you start such modifications, probably you’ll find other things to change or -using delagem words- you’ll have to work on
details. And details = money * time!
If you are interested in what I did, here are some explanations:
I mounted
Mikuni because Monster use them and not Weber. I didn’t trust Weber because they cause problems even with original Paso, while Mikuni are good for Monster and (for me) easier to handle. When Gerhard gave me the manual about how to revision them, they become even better.
It was a choice of mine, maybe other ideas are better (for example Dell’Ortos…)
I used K&N-style
air filter because I couldn’t manage to build a suitable airbox (as Gerhard did!!!
)
About
CDI: initially I was not sure if Paso and Monster units were compatible, so I change them because I preferred not to risk, and then I choose Pederzini AL-9000 just for performance and best tuning. Later I discovered that both Paso and Monster unit are Kokusan, both degree advance is 6° until 1700rpm and raises to 32° until 2600rpm, so probably they are… identical. Surely this upgrade is not compulsory.
An interesting article about Pederzini CDI on a Ducati 900 engine is at
http://www.visi.com/~moperfserv/ignition.htm
I also choose to change
voltage regulator. Paso generator is 12V 300W 3-phase and Monster generator is 12V 350W single-phase, and consequentially regulators are different. From Ducati Energia catalog I found that Paso spare part (34.8520/8 or 54040011.A) is different from Monster unit (34.8637/0 or 54040081A): both are 12V/25A but Paso unit is “controfase” (counter phase?) and has 6 wires, while Monster unit is “a ponte” (bridged?) and has 5 wires.
Theoretically it's possible to connect a 3-phase generator to a single-phase regulator (i.e. Paso Engine to Monster rectifier), but I was not sure about vice versa. Also due to Paso regulator weakness, I preferred to choose Monster unit and connect Monster single-phase generator to its own single-phase regulator.
I also applied the well-known start relay modification…
Ignition
coils are different, too: Paso models have HV resistance = 8800 ohm and LV resistance = 40 ohm, while Monster units have HV resistance = 12,000 ohm and LV resistance = 3,4 ohm. Initially I used Paso units, but when one failed, I replaced both with Monster parts.
With coils I replaced
plugs, too: I use Monster’s CHAMPION RA6HC instead of CHAMPION RA6YC. They are very similar, but RA6YC has standard projected core nose, RA6HC has 0,030” core nose projection. According to edelbrock.com, “providing there is sufficient clearance to valves and pistons, [..] initiating the flame front closer to the center of the combustion chamber has a similar effect to advancing the timing. Therefore, maximum timing may be reduced which helps reduce the chance of detonation and provides superior part throttle response. A second valuable feature of this style is a "broader" heat range. The core nose is longer, providing a "hotter" plug at low speed which helps prevent fouling. As engine speed increases, the incoming air/fuel mixture flows across the tip of the core nose, providing charge cooling which effectively reduces heat range at higher engine speeds for increased pre-ignition and detonation protection.”
I don’t know it is really true, but it seems reasonable and I trusted in it.
Paso
shifter lever fitted, but I found it uncomfortable with new clutch (that was not original one, but a Surflex special part…). A Ducati Service changed the cylinder with a new one (the only Ducati official intervention on my bike!), but it was useless. Another Ducati Service told me to change the
cylinder with a 998 unit with a different rod (this time I had to do it by myself…) and it was slightly better. But the final solution was the Monster lever: it’s adjustable in 4 positions, and with that I had a better feeling with clutch. This is subjective, since my brother (who uses the bike with me) prefers different regulations than mine.