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6 vs 0 for the keeping the pump. Looks like that's the plan!

Once I move the bike to somewhere suitable to pull wrenches I'll be rebuilding the spare r5 that I got with it. Hoping to restore it and sell it to partially finance this build. Should have enough parts to restore the part bike thankfully.

Thanks a ton for all the input, went down the cpi big bore rabbit hole, TZ, etc. As it stand I'm leaning towards this:

Cylinders: Webike LC jugs (Nikasil is nice to see)
LC set up TBD

Exhaust: Tyga or JL

Clutch: TBD

Carbs: Still mulling over the idea of smart or lectron even knowing the potential top end loss and ridiculous price. Dug into 2-1 like the banshees run. Pretty hard to find upsides with that set up haha.

Ignition: Vape with Zeel

it says RZ, but these are non powervalve LC cyls. 

You mean to tell me I can drop these on the r5 case!?

https://japan.webike.net/products/25625106.html#specification

i mean, if you want to lc it, new cyls are available from webike and will bolt right on. 

on my 72R5 I put on a set of the cheap reproduction aircooled cyls and have actually been VERY happy with them (and i already have an lc converted bike).

get a vape cdi and a programmable igniton as well, highly recommend, and a good disc brake setup after the HP is added.

Vape CDI, okay thanks I'll check er out! I'm not seeing the jugs on Webike? Got a link for my dumbass?
I suppose if I'm looking to jack this thing up LC is a not essential but realistic for sure

Alright guys, my R5 has been sitting in the shed with a bunk piston for two years now. I've been scouring the internet but want your thoughts. What's the best combo you guys have seen to get some serious horsepower down. Bike won't be on the track but won't go on rides longer than 30-60km at a time, not overly worried about expenses or longevity where it gets in the way of power substantially.

I'm seeing these mods online but having a hard time seeing the obvious winners:

Current status:

-4000km, bored 2 sizes over.
-Oil pump currently installed and working but will likely be removed.
-Barret clutch springs and plates but still having slip issues.
-Hole size of a dime in the center of right piston. I'm assuming pre-ignition issues.
-Stock point system.
-Stock mikuni
-K&N Y Boot

What would your dream build incorporate?

(Engines getting fully stripped down to do all the seals and leak down.)

-RD 350 or 400 jugs and heads with RV's?
-LC conversion?
-Mill out to accept bigger cages?
-Bigger carb or Lectron/smart carb?
-Ignition is a must, who's the clear winner these days?
-Long Stroke bottom end?
-Nikasil the Jugs?
-Expansion Chambers?
-Clutch, what damn clutch to never slip again.
-Etc, etc, let me know what you guys would do.