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[HILLSIDECYCLE.COM]

Seems none of these cranks are passing the test.
.016" out-of-true condition, on this one.
"The road goes on forever, and the party never ends."
Scott

[harleycharlie1992]

I kept telling everybody that the crank is made the same way the others were...badly!! nobody wanted to listen, and all said they are tighter on the press fit. I remember just shaking my head!!! hate to say it but: I told ya so

[sadunbar]

Seems none of these cranks are passing the test.
.016" out-of-true condition, on this one.
"The road goes on forever, and the party never ends."
Scott

Mine is less than .001...  I have over 15K trouble free miles so far.   

[laylonlor]

wouldn't it still have  to be plugged  and welded , so what good is buying one  of these pieces of junk , just build you own120

[Black Diamond]

Seems none of these cranks are passing the test.
.016" out-of-true condition, on this one.
"The road goes on forever, and the party never ends."
Scott

Looking in to the SE 120R at this time.
I have communicated with several that are currently using the SE120R. I've heard of some lifter issues.
Yours is the first with the crank issue.

How many have you measured? How many were have had a crank problem?

JW

[grc]

wouldn't it still have  to be plugged  and welded , so what good is buying one  of these pieces of junk , just build you own120

Considering the idea that many folks immediately change out some of the parts that come stock anyway, that might be a better idea.

Until Harley scraps the 100 year old pressed crank design and goes with a modern one piece crank and two piece rod design, I would imagine the crank problems will only get worse as they continue to increase engine size, torque, and the weight of the bikes.  Before I'd pay them what they ask for a 120R, and then have to break it all down to send the crank out for truing and welding/plugging, I think I'd just see what a highly reputable engine builder would charge to start from scratch and build it right the first time. 

I'll be interested to see what kind of reliability S&S will have with their new T-124 replacements for the Twin Cams.  If they do well, there will finally be a viable alternative to the H-D and Jim's offerings.  Can't happen too soon IMHO.


Jerry

[CVOThunder]

Well this comes at a perfect time. My fingers have been itchin' to check on a discount price for a 120R and get a new mill installed before I come home for vacation. Now that it's resume writing time again to find a different position, any new expeditures are put on hold. At least the house refinance is almost finished so maybe it's just time to say screw working overseas and come home....to what. No jobs to look forward to in my area. Suck it up and take a wage hit is better than no job at all.

Anyway, good info gents and when the time comes I'll look into other options.

[HD Street Performance]

Well this comes at a perfect time

I would say so too but for different reasons
Business is slow for some apparently

Creates a slippery slope fallacy to say one is bad they all are crap or MOCO stuff is crap.
There are many happy owners of those 120r motors

[sadunbar]

Well this comes at a perfect time

I would say so too but for different reasons
Business is slow for some apparently

Creates a slippery slope fallacy to say one is bad they all are crap or MOCO stuff is crap.
There are many happy owners of those 120r motors

Many, many, many....  Close friends of mine, and 15k later, myself included.....   

[GMR-PERFORMANCE]

We have done a fair amount of these and have not seen that run out yet..  In fact they have been extremely good and runout no more than .015 from what we have seen.. I agree many many happy campers with the 120R lower end.  We just got two more in for installs and upgrades and they are not out of spec by any means..  Both want cam swaps and nothing else.. Looking forward to these two builds..

[TexasBowhunter]

We have done a fair amount of these and have not seen that run out yet..  In fact they have been extremely good and runout no more than .015 from what we have seen.. I agree many many happy campers with the 120R lower end.  We just got two more in for installs and upgrades and they are not out of spec by any means..  Both want cam swaps and nothing else.. Looking forward to these two builds..

Steve
You mean .0015 right?

[CVOThunder]

Well as one fellow mentioned he took his new 120R apart and blueprinted the engine and trued,balanced and welded the crank when he first got it. I was thinking along those lines as well just to ensure my investment doesn't go south. I sure do enjoy watching the you tube videos of the one fellow who put a 120R in in 2010 Ultra but I guess he got it too hot in traffic and it cooked down a rear jug gasket. Anyway, I like the way it rolls out but I do wish it was in granite color. Oh well, minor deal.

So mechanic brains, which comes first...truing the crank or balancing? Seems like you'd want to true it first then weld it together so it's rigid. Then balance it due to the addition of the welding material. Just not sure how balanced the crank is or if it would even be enough weight from the welding to create a problem. I'm thinking automotive balancing is done to 1/2 gram (been awhile...maybe it's 1 gram) but when a Harley crank gets balanced just how close is the tolerance. I think this was mentioned in another thread or I'm just dreaming chit up.

Cheers

[sadunbar]

Well as one fellow mentioned he took his new 120R apart and blueprinted the engine and trued,balanced and welded the crank when he first got it. I was thinking along those lines as well just to ensure my investment doesn't go south. I sure do enjoy watching the you tube videos of the one fellow who put a 120R in in 2010 Ultra but I guess he got it too hot in traffic and it cooked down a rear jug gasket. Anyway, I like the way it rolls out but I do wish it was in granite color. Oh well, minor deal.

So mechanic brains, which comes first...truing the crank or balancing? Seems like you'd want to true it first then weld it together so it's rigid. Then balance it due to the addition of the welding material. Just not sure how balanced the crank is or if it would even be enough weight from the welding to create a problem. I'm thinking automotive balancing is done to 1/2 gram (been awhile...maybe it's 1 gram) but when a Harley crank gets balanced just how close is the tolerance. I think this was mentioned in another thread or I'm just dreaming chit up.

Cheers

There is no need to rebalance a crank assembly after welding, if you chose to weld the crank...Quite honeslty, if your crank is true, I'd suggest leaving it alone...

[Twolanerider]

Quite honeslty, if your crankj is true, I'd suggest leaving it alone...

"If it ain't broke don't fix it" is not a motto that sells parts and labor though Scott.

[sadunbar]

"If it ain't broke don't fix it" is not a motto that sells parts and labor though Scott.

lol....  So true...