Great info Delboy!
The fact that you have not 1 but three of these in different variants is amazing!
I've started gathering parts for a 385 with +4mm with standard RZ barrels with mild port, 34mm carbs and GPL stroker pipes.
Not sure what air box yet.
Looking for a motor that will do both street and some trackdays.
I still haven't ruled out the Athena kit.
Are you still running the oil pump on your 385?
Which exahusts, carbs and airbox are you running with each configuration?
Yes, it’s those long cold Canadian winters. Have to have something to do.
On the 385 I'm running Glyn's pipes. You will be very happy with them. They are great. The porting was done by Mick Abbey to Glyn's spec and Vance at Oshawa Precision machined the original head. I'm running PWK 33's on that one, foam filters and a combo Zeeltronic that has the CDI and YPVS controller build into one unit
For the 421, I’ve got Kenny’s (TSA) pipes that I bought second hand and am running the Athena barrels and heads with Domes from Roger over at Wicked ATV. It has PWK35’s and foam filters and the Zeeltronic CDI being fed by a RD350LC generator. BTW. Glyn's pipes will also work great on this motor
The 443 was a kit I had on an old banshee. It’s the CPI Serval block that they describe as a “Dune port” for playing around. It probably makes it peak power by 8500 rpm but just pulls like a train from about 4 to 8.5, its like a four stroke. It’s very linear and has a lot of torque. It’s really good for the street, probably not so good from the track. That one has a NOSS head and PWK 39’s. It has Matt Shearer pipes that I modified to fit the RZ frame. It also has a RD350LC generator. I bought the barrels, head and crank as a kit from Farm and Sand Toys Racing. Jeff is one of the cheapest around
For them all I had to run Rogers billet intakes to lift the bigger carbs above the clutch arm. That leads to some issues with the cable routing as they have to go over the frame rail where the rectifier bracket clips on, so you need to get rid of that. I just made a smaller plate from Aluminium that the rectifier and the Zeel get bolted to on opposite sides. If that makes sense
All of them are running either Vforce 3 or 4 reeds.
For the Athena and NOSS head, I used and inline KTM thermostat on the hose between the head and radiator. If its track only you probably don't need it but I found that spring and fall on the street the temperature would drop right into the cold region of the gauge.
All the cranks are +4 or +7 with the 115 rods. One of them came from TSS and it’s a nice piece of kit but unfortunately they are gone. The +7 is Hotrods that was rebuild by Willie in Ajax using genuine Yamaha big ends which seems to be their weakest spot, although everyone raves about their rods. I know Roger ate Wicket and Jeff at FAST install a lot of Hotrods Rods
I’m currently running them all without the pump, but am going to send a couple of pumps to Arrow over the winter, He can rebuild them with more capacity for the stroker motors. I’ll probably put the pumps back on the 421 and 443.
For some road and some track you’re probably best off with the RZ barrels or the Athena. The Serval is really nice for the street but will not rev high.
BTW, Matt can do pipes that bolt up directly to the RZ. I happened to have the set from the banshee that I cut and re-welded to fit the frame as I'm cheap