2 Trac WR450 2005 UK Model
Posted December 23, 2009 - 09:52 AM
Does anyone have any experience with Yamaha's 2 wheel drive WR450 2 Trac?
Mine is the 2005 model (last of the steel frames), with the full Ohlins set up including steering damper and 2wd system.
I'm looking at removing the standard exhaust and replacing it with DEP's System 7, as well as the air filter with a K&N , so any ideas as to what jetting would suit said alterations? The bike is completely standard, and has only just been run in and serviced accordingly.
Has anyone altered the gearing with the 2 Trac system without changing the pump ratio? I'm going to be running the bike on the road as well as off, so will want a bit of speed to avoid being overtaken by busses!
Posted December 24, 2009 - 01:45 AM
What seems to be the problem with them? Being a bit of an old(ish) git, I'm out of touch with the filter market, so have always considered them as a good bet.
Posted December 24, 2009 - 10:51 AM
looking to play out in the peak district wed 30th hopefully in the snow
Posted December 24, 2009 - 11:54 PM
Posted December 25, 2009 - 12:29 AM
Contact Owen from Manchester Exreme. He seems to be the current expert on the 2 Trac. Reckons a 48 tooth rear sprocket gives an extra 10mph without reducing pump efficiency.
Posted December 25, 2009 - 01:01 AM
A brief potted history.
Ohlins(then part owned by Yamaha) developed a hydraulic drive system to power the front wheel when the back wheel loses traction. It is run by a small pump that sits over the gearbox and is driven directly from the drive shaft. In the larger than normal front wheel hub sits the hydraulic motor. A maximum of 15% power is transfered to the front as and when it's needed. Too much power to the front reduces steering grip as well as making it a very harsh ride( hence the fitment of an Ohlins steering damper).
Only one run of 250 units were produced and were astronomically expensive (12000 Euros+), so only sponsored teams and the wealthy bought them.
Results in the 2004 Dakar speak for themselves, as the boss of Yamaha France took 3 stage wins outright and cleaned up the 450 Class as well as trouncing most of the 650 Class as well.
The project was shelved by Yamaha for no particular reason, I'm guessing when Ohlins bought their shares back from Yamaha. There are a couple of revealing articles on the web explaining the politics of Ohlins relationship with Yamaha.
Their system adds approx 6 kilos to the overall weight of the bike; the majority of it centralised above the gear box, and the rest in the front hub.
Lap times are claimed and proven to be improved,not so much solely from the front wheel drive, but more from the traction control effect of not wasting rear wheel spin.
Hope that's explained enough to whet your appetite!
Posted December 25, 2009 - 12:28 PM
Still a great bike and suits my lazy riding
Posted December 25, 2009 - 05:06 PM
Posted December 26, 2009 - 04:01 AM
I'll stick to the foam filters until further notice.
What exhaust systems seem to be the lightest/best at the moment?
Noise isn't too much of an issue out here in the sticks; besides, I prefer to let the horse wanderers know I'm coming in good time!!
Posted December 26, 2009 - 06:43 PM
Posted December 27, 2009 - 03:48 AM
I've looked at Powerbomb headers but haven't been able to find anything for the '05 WR's.Everything with Powerbombs seems to only be available for '07 bikes and newer.
So far I've got my sights set on DEP's S7( which only offers a full system without the Powerbomb header), but I like the idea of putting a YZ system on, if it fits without too much hassle.
Happy New Year, by the way to yourself and all TT'ers.