120R has lefty bearing and a forged SE crankshaft with a 4-5/8 stroke. The stock HD crankshaft is cast and a piece of junk. Not that the SE crank is great but the stock one is junk.

 

I forget what the Black spring is, I dont think Rivera list the pounds of pressure for their springs, I went to the AIM gold spring which fits the Rivera, the gold spring at 480 lbs pressure. It held where the 1st spring (silver) could not even be used to tune it slipped so much. Give Rivera a call, you might be ok but if less than 480lbs, get rid if it. I am thinking your going to need the Boarzilla, I think there was a guy that tried the Fatcat and it held the motor back. My D and D has the quiet baffle (quite the oxymoron, not that quiet!)

 

Ordered the primo gold spring,andrews 31 tooth sprocket to remove some of the gear,and a D&D bosszilla today. Im going to take 1 tooth out of the gearing. I think first gear will be useless with the 120 and the 30 tooth sprocket. It already rev's very quick with the 106 I have now.

 

Rivera's is 400 and Aims is 480 not sure if that is a big deal. Do you have just the Rivera inner hub or the whole clutch with outer basket?

 

I have the complete rivera pro clutch with the varible pressure plate.

 

I was ready to buy the whole set up but i am finding that the stock clutch with the Aim vpc and gold spring is holding much more than this whole 1000.00 Rivera set up. Could it be that the Rivera does not like the 30+ ounces of oil bath? Way too much money to have slipping problems, they also have a sealed ball bearing in the outer basket for running their clutch dry i would rip those seals out and have the primary oil lube it which they told me to do today when i talked to Rivera and they also told me to run the primary oil low with their clutch,would sure like to get a clutch assembly that worked with a high tq engine when i spend a grand. Several builders are claiming the stock clutch with the AIM vpc and gold spring are holding close to 200 hp so why deal with the Rivera slipping in the oil for all that coin???

 

I know of a few 124 builds that have a rivera pro clutch and have no isssues. I will find out shortly if it will hold. I also only paid 469.95 for my vpc rivera.

 

The 120r is shipped and I should have it friday. I'm feeling some burnouts and wheelie's coming soon.

 

Well I'm pulling the trigger on my 08 Fat Bob. So I'm going to call Capitol H-D in the morning and if they can do my bike for $4650.00. They will have it this weekend. I live in Ohio so its close.i hope they can do it. I know there will be some extra cost but involved but hell 120 CID wow.They can have my 96 its only got 10,000 miles on it . wish me luck.......

 

Well i called Capitol to see if i could get the 4650 deal......Nope, They said it would be 6100. Hell for that much i can do way better build for less then that....