I thought this might interest a few folks... The factory titanium spring from the YFZ 450 dirt bike has a rate of 5.5kg, 11" length (.3" shorter than stock?) and 61mm ID ends. It should weigh roughly 2 - 3 lbs less than a steel spring.
It might be a good drop in replacement for KYB/Kayaba equiped rides, and with two end adapters the Ohlins. We'll be doing a trial fit on a buddy's Apex GT elec. Ohlins in the next couple of weeks.
Oh, you can pick up new take offs on ebay for $80 - $150. Retail from RCS would be about $400 for a spring like this.
It might be a good drop in replacement for KYB/Kayaba equiped rides, and with two end adapters the Ohlins. We'll be doing a trial fit on a buddy's Apex GT elec. Ohlins in the next couple of weeks.
Oh, you can pick up new take offs on ebay for $80 - $150. Retail from RCS would be about $400 for a spring like this.
1000 stroker
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Great post. Keep us posted as to how that works out. I need to stiffen up my GT.
Finally got around to installing this along with revalving the Ohlins. Note the two adapters... pretty easy.
rx1warrior
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Is it installed yet? does it seem much stiffer?
Alatalo
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55 N/mm...?
Sounds a bit on the soft side...?
Sounds a bit on the soft side...?
The snow keeps missing us, so no testing yet... it's early for snow around here anyway.
The spring is a 5.5 KG, I corrected it above.
The spring is a 5.5 KG, I corrected it above.
This set-up is working quite well and is night and day compared to the stock calibrations. I still wouldn't call ready for the snowcross circuit 
, but it has made for a great all around sled that can tackle the trails all day long w/o beating one up (from being too soft or stiff)
, but it has made for a great all around sled that can tackle the trails all day long w/o beating one up (from being too soft or stiff)dogger#1
Newbie
What is the stock spring rate in the Apex GT mono suspension? I assume it is in the 4.XXKg/mm. I can probably get a few of the slightly used Yamaha Ti springs for the YZ250 bikes that came stock, but as far as I know they were 4.9Kg/mm. At least in my '06 YZ250 the Ti spring was that rate.
If I had the time, I would love to tear that spring out of the bike and try it now that I have seen this as an option! There would be a weight savings of 2 lbs, and this is unsprung weight savings. In the MX bikes they make alot of claims to the benefits of Ti springs.
Did you use a 1/4" shim on the spring to make up the lengths difference?
Cheers,
Dale
If I had the time, I would love to tear that spring out of the bike and try it now that I have seen this as an option! There would be a weight savings of 2 lbs, and this is unsprung weight savings. In the MX bikes they make alot of claims to the benefits of Ti springs.
Did you use a 1/4" shim on the spring to make up the lengths difference?
Cheers,
Dale
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