Fork Springs for Snowbike

Have a 2012 TE511 spinning a 2015 Timbersled 120. Forks have bottomed on occasion, and dive considerably. I understand that the 48 mm KYB's have a stock rate of .48 kg.
Does anyone know of a supplier that carries heavy springs?
I did contact RaceTech in California. The heaviest they have is .54 kg. I am probably at least 240 lbs with gear.
I am thinking of a .58-.62 kg spring would drastically improve the handling.
Can anyone point me in the right direction ?

sorry- I don't have any info for you. You are talking some pretty stiff rates... can I assume you are using a heavier fork oil at a higher level and have cranked your clickers down?

Also, that snow looks pretty- where are you at? BC? How many gallons of fuel are you carrying?

Yes , the stiffer the better. Have tried heavier oil, with some success, but in the cold it slows down everything , compression and rebound. You have assumed correct in turning clickers also. Yes BC, out near the Grizzly Lodge, northwest of Sicamous. Gas caddy is about 3 gallons, even more weight to carry. I transfer fuel , right after the groomed trails which can be up to 40 km ( 30 miles), to get the weight off the skid. I captured a sno-ghost picture of Oldman Winter in the April of this year, he didn't look happy.

I would love to have a crack at snow riding, Looks like the ducks nuts.

I've had custom springs made by Cannon Racecraft before

http://www.cannonracecraft.com/

Ordered a .64 kg/mm rate spring from Cannon Racecraft. Thanks for the input !

you sure that's gonna be stiff enough? <jk>

enjoy.

Oh yah ! The potential for bottoming out is 10 fold on a snowbike.
Your wrists will let you know instantly, when the stock springs are fully compressed!

Thanks, season should start soon, although there are few snowbikers here, I will opinionate the new springs next month !

Cheers !