What are the benefits of doing the yZ Timing?
Posted May 18, 2006 - 01:33 PM
Posted May 18, 2006 - 03:00 PM
I also think it affects the auto decomp and makes the e-starter unable to turn it over.
Posted May 18, 2006 - 05:36 PM
Posted May 19, 2006 - 08:21 AM
Much better performance
It really wakes the bike up. Imagine driving a Diesel truck, and then putting a chip int he truck....thats the effect.
I love it!
Posted May 19, 2006 - 03:57 PM
Posted May 22, 2006 - 04:31 PM
Posted May 22, 2006 - 05:19 PM
nice complaint, is this doable on an 06 with auto decompression?
Yes. For the '03 and up, you MUST replace the exhaust cam with the YZ version. Simply retarding the cam one tooth will not work as the auto-decomp pin is longer and opens the exhaust valve too far...SC
Posted May 23, 2006 - 08:02 AM
Mine is actually the Yamaha cam for the YZ. I have heard others recommend a webber or hot cam for this mod, but they do run more money.
Personally, I don't think it is too much power...... in fact I would like more power still. I would say that it moves the powerband further down the rmp range. Instead of having a slight lag before the power kicks in, its more instant. This works well for sand and track conditions, but I can see where some would dislike it in the slick stuff like mud.
Learn to ride properly and use the clutch though, and its a non issue. In short, it wakes the bike up and keeps it closer to race form, but its not a huge power add on that is going to make the bike scream.
just my $.02
Posted May 26, 2006 - 06:36 AM
Posted May 26, 2006 - 07:21 AM
Posted May 26, 2006 - 10:35 AM
I just looked up a 2005 YZ450 cams on yamaha page, but which cam is the exhaust? does the exhaust have three valves or only 2? Im thinking it's the number 2 in this pic but not 100% sure
If i order this cam from yamaha do i use the WR or YZ timing then> want to make sure this will all work for my electric start on my 06 if i do it this way, I need more power.
Posted May 26, 2006 - 12:20 PM
The only bikes where the timing change was needed were the pre-450 models (once again not positive) [WR400, WR426 - retard them to get the YZ400, and YZ426 exhaust timing] These bikes didn't need a cam swap, just a timing change.
On the 450, you swap out the cam due to the auto de-compression pin. You leave the timing the same and replace the cam since the YZ has taller lobes which open the exhaust valves more.
I stuck with the YZ cam since the guy I bought my bike from already had it, but you might want to look into the hot-cams or webber cam as well. Mine is the actual Yamaha part.
Posted May 27, 2006 - 05:30 AM
Posted May 27, 2006 - 08:23 AM
Posted May 27, 2006 - 01:58 PM
Edit: I've been corrected, they are not the same part #. Too much 2 stroke fumes have blurred my brain and trifocals.