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Although balancing like a multi cylinder engine is not possible, it is crucial to have a correct balance factor wich is basically a ratio of reciprocating mass vs counterweight . That ratio is typically anywhere from 50-60% . When modifying an original crank into full circle like posted above...

That got a bit out of hand 😂 Thanks for the kind words guys , Kevin , Ethan , Custer much appreciated.

Thanks guys you're on top of it !

Hi sir , that is my work and would appreciate those pictures be kept where they were shared , in private . Thank you

How many you want ? I build 572s for racing and take off the flywheel wich is why I have plenty of them .

Pm sent on that !

Pm sent

3120 come with 1/4-20 bolts and thats plenty , no need to go bigger as long as you make sure you have enough thread length .

This weekend a stock head 372 running gas whooped the ass of a bunch alky saw and even finished 2nd ;)

If you would be interested to have one turned into a race build put me on the list !$

Some guys are going to be running gas saws in those class too . There's going to be a bunch of fast saws and knowledgeable guys there , sure worth the trip !

Looks good ! You should bring it to Maniwaki this weekend ;) Some of your buddy from Abitibi are going to be there too !

How is the compression ? Where did you buy it ? Numbers # ? You got my interest .

I’ve got you . Ktm Sx50 clutch bearing . Part number # 45132015000 ID 15mm OD 18mm L 17mm I’ve used that bearing as a wrist pin bearing for quite a couple big cc and HP builds and it’s a very high quality bearing that can stand the load and heat .

What are the ID and OD for that wrist bearing you need ?

Do you have another one ? How much are you asking ? I've been looking for one for a while .

The rod bearing being an odd size is not a problem. Use standard pin , bearing and rod and machine the ends of the pin to fit . For the small end just pick a bearing to fit whatever your pin size is . I think Deets was proposing to use a 084 conrod .

You don't need to heat the crank to press it apart , a 20 ton press , a bushing to press against and a punch to push the pin out is all you need . Seems much more complicated than it really is . With a pressing jig to put it back together I can press it apart and pin it back in under 15min...

Machining the weights and buffing the conrod is all that it needed to put the 3120 crank into a 2100 , even the key line up . So yes you can also put a 3120 crank into a 288/395 .

Machining the weights is much simpler . For the rod just buff it till it clears , I've been putting those 2100 in 394 and jonsered 2095 for years to turn them into 6 cube racers and its been holding fine ;) What did you do for the key ?