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Unread 07-08-2018, 05:45 PM   #1
Crazy Ole Man
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Join Date: Jan 2016
Location: Owego NY
Posts: 2,010
Default Secondary Clutch Spring Placement.

I replaced my driven clutch when I overhauled the differential. 8 to 1 gear ratio driving 25 inch tall tires. I use B - 1 for my first spring setting. The driving characteristics are -- it pulls hard and the rpm runs 36-3800. I keep the pedal to it and the speed climbs higher and higher -- 44-45 mph and the rpm goes to 43-4500 rpm and then is runs out of torque to go any faster. I have a new belt and a set of VC's dog bones to install. I'll see if it runs any faster. There isn't any spring charts from Yamaha that tell what the spring setting do. Maybe someone could help me figure out how to get it set like I was going back or one lower gear.
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Unread 07-08-2018, 07:30 PM   #2
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Join Date: Oct 2014
Location: Ray BY The Bay NJ
Posts: 5,280
Default Re: Secondary Clutch Spring Placement.

The umaxx spring on on of the higher b's will certainly delay the shift over. JEEZ Did those things go up. I paid less than $20 for mine but I see even at it is now $65. part # 90508-45849-00. That was the one I had to cut with the plasma cutter when my secondary locked up.I had wondered with the tall tires and high speed gears if it would be needed.
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Unread 07-09-2018, 05:13 PM   #3
Vegas modded 420
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Join Date: Jun 2009
Location: West MI
Posts: 14,716
Default Re: Secondary Clutch Spring Placement.

The secondary is all about shifting, mostly what it shifts at part throttle. It will change WOT a little but not much, it will change part throttle rpm a lot. If you run it with no preload it will drop rpm when you let off, it will only get rpm when you floor it. If you run a ton of preload it will stay at WOT rpm all the time, low or high throttle it will run around 3800 all the time pretty much. So B3 is stock and midway, it gives you some response to rev when you hit the gas but also lowers rpm when you just run along at moderate speeds. IIRC its b1 b2 b3, then c1 c2 c3 are the steps of increasing preload. Of course you have to go past a ramp then up the second ramp and bolt it on. You will notice you do more ramp and twist the higher you set it. B3 can be pushed on by hand with a stock spring by most able people, c range gets harder to do. The umax will increase rpm at lower speeds, at about 20-25 in my cart it ran about the same as normal, below that it would rev more. It was made for utility carts that haul stuff, it works well. Not sure why it is so expensive now.
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Unread 07-16-2018, 07:11 PM   #4
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Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 6,022
Default Re: Secondary Clutch Spring Placement.

I'm using the Plowman's secondary with a stock Yami spring. It'll pull a 5x10 trailer full of wood and do 40 mph +, all with the stock Vanguard 16hp with rev kit. 23" tires and stock gearing in a G2 transaxle. I'm very pleased with that. I had the heavy white spring from Plowman's in it and it was just way too stiff.
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