The new build. Help me decide.

[MedicWild]

Hey all,

Hope everyone is doing well and thanks in advance for giving me any insight.

I have two general questions; one about a PMA reg/rec and the other about deciding on a big bore kit.

First question is this; I have a HHB complete PMA and CDI kit minus the MOFSET regulator rectifier. I used the one from my current kit to get another xs out the door for a friend. With Hugh’s website being down for months, I have been SOL on getting a replacement from him despite messaging. His PMA has TWO yellow wires leading out for the reg/rec and all the MOFSETs I am seeing for sale have THREE inputs. HHB MOFSET only had two. Can I just run two into a three? Not sure how that works. Pics attached (ignore the stator pickup circle, but notice the two yellows in the lower right. The photo is reused)

2nd question; the motor I am going to be using for my new build needs a complete tear down and rebuild so now would be the time for me to consider a big bore kit. A nut from a valve adjuster screw came loose, wedged itself under a cam lobe and blew through the head. Yikes. Do folks like the big bore kits enough for the $? Will this lead me down a hole to rephasing and swapping cams? I am not racing this hardtail but have read that the 750 big bore can be nice in reducing vibration and the extra power is appreciated. Thoughts?

Again, thanks for any insight. I am by no means an expert and love learning about these bikes.

 

[Its been a long time]

On that HHB PMA, it looks to me like there's two charging phases (the copper coloured windings?) and one set of ignition windings (the white windings?). That's my guess.

If that's the case, connecting the two charging phases to two phases of a three phase reg/rec, it's going to depend on the maximum amps output by the two phases and the ability of the reg/rec to take that input. What information is available from HHB?

Regarding a 750 conversion, I haven't done one. But fundamentally, if the 750 pistons weigh the same as the 650 ones there'll be no difference in vibration. If the pistons are heavier or lighter in the 750 conversion then unless a change in crankshaft balance is made then engine vibration will certainly be different. Suggest a conversation with the seller of the conversion to understand fully the consequences of the change you propose to make.