V-twin + UMAX secondary spring?

Field6565 · 02-10-2015, 06:21 PM

Hey does anyone have a V-twin in their Yamaha and using a umax spring in the secondary clutch? What kind of preload you are using? Preload numbers? Thanks

smallblock450sl · 02-10-2015, 07:13 PM

Just my 2 cents worth, I would start with the stock spring set at "B-4". The torque from your V-Twin is so much more then stock. If you wanted more torque, Umax spring set at B-3 or B-4.

1989Marathon · 02-10-2015, 07:17 PM

Quote:

Originally Posted by smallblock450sl

Just my 2 cents worth, I would start with the stock spring set at "B-4". The torque from your V-Twin is so much more then stock. If you wanted more torque, Umax spring set at B-3 or B-4.

I agree. The lower the spring pressure on the secondary, the happier you will be.

Field6565 · 02-10-2015, 07:48 PM

Quote:

Originally Posted by 1989Marathon

I agree. The lower the spring pressure on the secondary, the happier you will be.

Ok. New plan. Right now I have the stock G1 spring in it with a .400 shim to put more compression on it. That's how it was with my stock G1 set up and clone set up. I'm going to remove the shim and use the stock G1 spring by itself.

1989Marathon · 02-10-2015, 07:52 PM

Quote:

Originally Posted by Field6565

Ok. New plan. Right now I have the stock G1 spring in it with a .400 shim to put more compression on it. That's how it was with my stock G1 set up and clone set up. I'm going to remove the shim and use the stock G1 spring by itself.

Then adjust the primary to work how you want it to.

slonomo · 02-10-2015, 11:55 PM

The old spring could be worn out Gary. Try it and see.

nobuckbuild · 02-11-2015, 07:43 AM

ok now that we have a yamaha in the driveway that may be getting a twin i will need to know what works here

slonomo · 02-11-2015, 08:42 AM

Whatcha got Rich?

TheNewGuy · 02-11-2015, 09:30 AM

With the big block engines, you want to use a stock spring in the driven clutch. I set mine at B2, feels great.

panteramatt · 02-11-2015, 03:59 PM

Yea I just installed my twin with a plowmans spring and sheave and it falls on its face after take off. Ill change springs back to stock and report back. Should I keep the plowmans sheave in or run the stock one?

02-10-2015, 06:21 PM	#1
Field6565 Gone Wild Join Date: Oct 2010 Location: Pittsburgh Pa Posts: 1,551	V-twin + UMAX secondary spring? Hey does anyone have a V-twin in their Yamaha and using a umax spring in the secondary clutch? What kind of preload you are using? Preload numbers? Thanks

02-10-2015, 07:13 PM	#2
smallblock450sl Sometime's............ Join Date: Oct 2007 Location: Tacoma Washington Posts: 11,875	Re: V-twin + UMAX secondary spring? Just my 2 cents worth, I would start with the stock spring set at "B-4". The torque from your V-Twin is so much more then stock. If you wanted more torque, Umax spring set at B-3 or B-4.

02-10-2015, 11:55 PM	#6
slonomo Searching for The Way Join Date: Oct 2009 Location: Medina, Ohio (NEOHIO) Posts: 11,441	Re: V-twin + UMAX secondary spring? The old spring could be worn out Gary. Try it and see.

02-11-2015, 07:43 AM	#7
nobuckbuild Gone Wild Join Date: Mar 2012 Location: CENTRAL PENNSYLVANIA Posts: 1,466	Re: V-twin + UMAX secondary spring? ok now that we have a yamaha in the driveway that may be getting a twin i will need to know what works here

02-11-2015, 08:42 AM	#8
slonomo Searching for The Way Join Date: Oct 2009 Location: Medina, Ohio (NEOHIO) Posts: 11,441	Re: V-twin + UMAX secondary spring? Whatcha got Rich?

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02-11-2015, 09:30 AM	#9
TheNewGuy Admin/Moderator Join Date: Dec 2006 Location: Ohio Posts: 18,055	Re: V-twin + UMAX secondary spring? With the big block engines, you want to use a stock spring in the driven clutch. I set mine at B2, feels great.
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02-11-2015, 03:59 PM	#10
panteramatt Gone Wild Join Date: Jan 2014 Location: South Jersey Posts: 623	Re: V-twin + UMAX secondary spring? Yea I just installed my twin with a plowmans spring and sheave and it falls on its face after take off. Ill change springs back to stock and report back. Should I keep the plowmans sheave in or run the stock one?

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